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1021 results about "Adjacent channel" patented technology
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In broadcasting an adjacent channel is an AM, FM, or TV channel that is next to another channel. First-adjacent is immediately next to another channel, second-adjacent is two channels away, and so forth. Information on adjacent channels is used in keeping stations from interfering with one another. See Adjacent-channel interference.
Method for database driven channel quality estimation in a cognitive radio network
ActiveUS20100330919A1Power managementTransmission monitoringCo-channel interferenceGeolocation database
A method of determining operating parameters for a secondary system transmitter is described. The transmitter characteristics, including location and operating frequency band, are provided to a geo-location database. The database determines the maximum allowable transmission power that meets various specifications for different channels and conveys the power and channel(s) to the transmitter. The database estimates channel incumbent signal strengths based on the transmitter location and primary and higher-priority secondary incumbent systems, estimates the splatter levels, determines whether adjacent and co-channel interference protection ratios are met, and adjusts the allowable power level accordingly. The database also estimates aggregate co- and adjacent channel primary and secondary incumbent system interference levels at the transmitter location and predicts channel quality for each allowable channel. The estimated levels are updated using measurements of actual levels at the transmitter location. The database dynamically allocates channels using the secondary system priorities.
Owner:MOTOROLA SOLUTIONS INC +1
Stressed barrier plug slot contact structure for transistor performance enhancement
ActiveUS20080157208A1TransistorSemiconductor/solid-state device detailsStress inducedPerformance enhancement
A method for forming a slot contact structure for transistor performance enhancement. A contact opening is formed to expose a contact region, and a slot contact is disposed within the contact opening in order to induce a stress on an adjacent channel region. In an embodiment, a stress inducing barrier plug is disposed within a portion of the contact opening and the remainder of the contact opening is filled with a lower resistivity contact metal. By selecting the proper materials and deposition parameters, the slot contact can be tuned to induce a tensile or compressive stress on the adjacent channel region, thus being applicable for both p-type and n-type devices.
Owner:INTEL CORP
Method for Dynamic Resource Allocation in Centrailized Base Stations
InactiveUS20080134194A1Efficient use ofResource allocationNetwork traffic/resource managementDynamic resourceParallel computing
A method for realizing dynamic allocation of channel processing resources and load balancing in a centralized base station is disclosed, said centralized base station comprising a plurality of channel processing units independent of each other and remote radio frequency units connected to said channel processing units. The method comprises: dividing a plurality of cells under control of said centralized base station into a plurality of cell groups that are geographically adjacent and are centralized in the same regions different channel processing units performing channel processing of corresponding cell groups, respectively, wherein the channel processing units which are responsible for processing geographically adjacent cell groups are an adjacent channel processing unit for each other; determining a processing load amount of the respective channel processing units and traffic of the respective cells; and adaptively adjusting the cell groups for which the respective channel processing units are responsible for performing channel processing based on the determined processing load amount of the respective channel processing units and the determined traffic of the relevant cells, thereby balancing processing loads of the respective channel processing units. The method can effectively utilize the channel processing resources.
Owner:UTSTARCOM TELECOM CO LTD
Methods and apparatus for utilizing radio frequency spectrum simultaneously and concurrently in the presence of co-channel and/or adjacent channel television signals by adjusting transmitter power or receiver sensitivity
InactiveUS7013145B1Reduce distractionsReduce the required powerTelevision system detailsBroadcast-related systemsUltra-widebandFrequency spectrum
To address the scarcity of radio frequency (RF) spectrum, the disclosed systems offer unique ways to mitigate interference between television broadcasters (including their direct audience and viewers served via cable television) and other concurrent users of the RF spectrum, e.g. for one-way or two-way wireless communication. A preferred embodiment makes use of the “framing” characteristics of the “letterbox” video display format. RF emissions of the simultaneous RF spectrum user are keyed “on” only or substantially only during the time intervals when the blanking intervals and / or letterbox-border video lines are being scanned on the display, i.e. when the potentially affected (interfered with) television display is in the letterbox-frame-scanning portions of each video field. The concurrent uses may support services for voice (including telephony, music etc.), data (including Internet, intranet, etc.); image or control; fixed, portable, mobile or nomadic; narrowband, broadband or ultra-wideband; radiodetermination, diathermy, etc. Additionally, the concurrent user's emitted power and receiver sensitivity is continuously adjusted according to the broadcast television signal.
Owner:CELLCO PARTNERSHIP INC
Method and apparatus of indirect-evaporation cooling
InactiveUS6497107B2Less energyHigh energy costFree-cooling systemsStationary conduit assembliesWorking fluidEvaporation
The within invention improves on the indirect evaporative cooling method and apparatus by making use of a working fluid that is pre-cooled with and without desiccants before it is passed through a Wet Channel where evaporative fluid is on the walls to take heat and store it in the working fluid as increased latent heat. The heat transfer across the membrane between the Dry Channel and the Wet Channel may have dry, solid desiccant or liquid desiccant and may have perforations, pores or capillary pathways. The evaporative fluid may be water, fuel, or any substance that has the capacity to take heat as latent heat. The Wet Channel or excess cooled fluid is in heat transfer contact with a Product Channel where Product Fluid is cooled without adding any humidity. An alternative embodiment for heat transfer between adjacent channels is with heat pipes.
Owner:F F SEELEY NOMINEES
Wireless communication system with dynamic channel allocation
InactiveUS6023622AFacilitate communicationReduce distractionsNetwork traffic/resource managementRadio/inductive link selection arrangementsDynamic channelTransceiver
A plurality of base stations communicate with a plurality of mobile units. Each base station includes a base station transceiver that receives inbound information from the mobile units and transmits outbound information to the mobile units. A mobile switching center (MSC) is coupled to the base stations and communicates the inbound information and outbound information with the base stations. The base stations each include signal detectors that detect signal strength of the inbound information, co-channel information and adjacent channel information. The MSC maintains a table of signal strength per communication channel and allocates communication channels to the base stations based on the signal strength information. The inventive dynamic channel allocation includes several channel allocation algorithms that can be active at the same time. Only one of the algorithms is active at a time. The choice of the algorithm is based on current interference conditions and traffic load. The invention is implemented in the MSC and base stations of a digital cellular network using wideband technology for its air interface. While the decision-making mechanism and the channel allocation algorithms are implemented in the MSC, the protocol between the MSC and base stations is extended to support the proposed concept for dynamic channel allocation. Advantages of the invention includes improved communication and reduced interference.
Owner:WJ COMM
Digital Hybrid Mode Power Amplifier System
InactiveUS20080265996A1High performance and cost-effectiveImprove linearityAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersPeak valueMulti carrier
A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.
Owner:DALI SYST LTD
High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications
ActiveUS20120155572A1High performance and cost-effectiveImprove linearityEnergy efficient ICTPower amplifiersUnit systemEngineering
A remote radio head unit (RRU) system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers, multi-frequency bands and multi-channels. As a result, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems.
Owner:DALI SYST LTD
Wireless communication system using a plurality of antenna elements with adaptive weighting and combining techniques
InactiveUS20060135097A1Simple interfaceMaintain sensitivityEnergy efficient ICTSpatial transmit diversityCommunications systemAdaptive weighting
Owner:RENDA TRUST
Transmitting method and apparatus, and sending power controlling method
In a transmitting method, it is possible to avoid influences of adjacent-channel interference to perform communication satisfactorily. In the case of performing transmission with a previously set sending power, the transmission is performed with the set sending power with respect to a channel having the largest sending power. With respect to a channel having the next largest sending power, if its adjacent channel is the determined channel, the transmission is performed such that the sending power is corrected on the basis of the sending power of the determined channel. Thereby, it is possible to prevent the signal-to-interference wave power ratio C / I of the channel from deteriorating due to the leakage signal (interference wave) from the adjacent channel. Thus, it is possible to avoid the influences of adjacent-channel interference to thereby perform communication satisfactorily.
Owner:SONY CORP
Method and apparatus for performing channel assessment in a wireless communication system
InactiveUS20060133543A1Serious interferenceAmplitude-modulated carrier systemsTransmission monitoringCommunications systemChannel assessment
A system and method for classifying channels in a frequency hopping wireless communication system is provided. A data collection engine operates to obtain channel metrics indicating the level of interference for each channel used by the wireless communication system. A data analysis engine operates to provide a channel map for adaptive frequency hopping (AFH) and / or a channel map for channel avoidance. More specifically, the data analysis engine first operates to filter the channel metrics to remove channel metrics indicative of frequency hopping interference. Next, the channels are divided into a number of channel blocks each including at least two adjacent channels. For each channel block, the channel metrics of the channels within the channel block are combined to provide a metric sum. The data analysis engine then operates to classify each channel as usable or unusable based on the metric sums for each of the channel blocks.
Owner:QUALCOMM INC
Display assembly with integral roller base
A display assembly and shelving unit. The display assembly includes a base with one or more channels that extend between the front and back of the base. The back is higher than the front so that the base is retained at an angle to the horizontal within the shelving unit. A conveyor mechanism operable under force of gravity is provided across the channels. The conveyor mechanism includes roller assemblies that have rods with a plurality of small rollers thereon. The rollers are able to rotate about the stationary rod individually and independently. When a product for sale is removed from a front end of a first channel, then the products remaining in that first channel slide downwardly on the rollers until they engage a stop. Products in adjacent channels will remain stationary as the rollers in those additional channels will not rotate when product is removed from the first channel.
Owner:E B DISPLAY
Communication method and apparatus for distributed network system where cognitive radio technology is applied
ActiveUS20080171552A1Overcome disadvantagesSmall sizeConductive materialNetwork topologiesComputer networkNetworked system
A communication method and apparatus for a distributed network system where a cognitive radio (CR) technology is used. A communication method of a distributed network system where the CR technology is used includes transmitting adjacent channel information,from at least one first neighbor node adjacent to a source node, first adjacent channel information of the at least one first neighbor node using a pulse signal according to a request ofthe source node; by transmitting, from at least one second neighbor node adjacent to adestination node, second adjacent channel information of the at least one second neighbor node to the destination node using a pulse signal according to a request of the destination node; and exchanging data between the source node and the destination node using a channel that is not currently used, according to the transmitted adjacent channel information.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Sole Structure For An Article Of Footwear
Owner:NIKE INC
Method and apparatus for scheduling downlink channels in an orthogonal frequency division multiple access system and a system using the same
ActiveUS20050265223A1Reduce the amount requiredTransmission path divisionCriteria allocationCommunications systemCapacity value
A downlink channel scheduling method and apparatus for obtaining optimal system performance in a downlink of a wireless communication system using an orthogonal frequency division multiplexing (OFDM) scheme are provided. Terminals compute a plurality of channel capacities and search for a channel with a maximum capacity. The terminals send, to a base station (BS), feedback information including a channel number and a capacity value of the channel with the maximum capacity. The BS performs a first channel allocation process for allocating a channel with an optimal capacity to each terminal on the basis of the feedback information. The BS performs a second channel allocation process for allocating an adjacent channel to a corresponding terminal using the window bit when the terminal is not allocated a channel in the first channel allocation process.
Owner:SAMSUNG ELECTRONICS CO LTD
Valves and other flow control in fluidic systems including microfluidic systems
ActiveUS20110151578A1Variation in amountValve arrangementsWithdrawing sample devicesControl flowControl channel
Articles and methods for controlling flow in fluidic Systems, especially in microfluidic Systems, are provided. A microfluidic System includes a configuration such that the actuation of a single valve can allow the switching of fluids from a first fluid path (e.g., a first channel section) to a second fluid path (e.g., a second channel section). This may be achieved by incorporating a valve (38) with a first channel section (24), which may have a lower hydrodynamic resistance than a second channel section (28) prior to actuation of the valve. Actuation of the valve (38) can cause only the hydrodynamic resistance of the first channel section (24) to increase, thereby redirecting fluid flow into the second channel section (28) (which now has a relatively lower hydrodynamic resistance). The valve comprises a control channel (40) for introducing a positive or reduced pressure, and is adapted to modulate fluid flow in an adjacent channel section by constricting or expanding the channel section (24).
Owner:PRESIDENT & FELLOWS OF HARVARD COLLEGE
Multi-functional substantially fibrous mullite filtration substates and devices
InactiveUS20060120937A1Small surface areaRapid back-pressure increaseCombination devicesInternal combustion piston enginesFiberFiltration
A diesel particulate filter assembly, including a housing having an inlet end and an outlet end, a particulate filter portion consisting essentially of mullite fibers and positioned in the housing, channels in the filter, a porous wall between adjacent channels, and an exhaust path extending through the inlet end, through the particulate filter portion and though the outlet end.
Owner:GE02 TECH INC
Direct conversion receiver using a dithered local oscillator to mitigate adjacent channel coherent interference
ActiveUS7024172B1Improve errorSubstation equipmentTransmission noise suppressionIntermediate frequencyLocal oscillator
A direct conversion quadrature receiver and method are provided according to the invention. The receiver according to one embodiment includes a primary local oscillator (LO) that down-converts a received RF signal to a quadrature intermediate frequency (IF) signal. The receiver further includes a dithering controller responsive to the quadrature IF signal generated by the primary LO. The dithering controller communicates a feedback signal back to the primary LO. The feedback signal controls the primary LO in order to offset down-conversion of the RF signal by the quadrature IF signal. The dithering controller offsets the primary LO from a zero-IF signal in order to reduce a phase and gain error of the quadrature IF signal.
Owner:ROCKWELL COLLINS INC
Frequency re-use planning for wireless communications system using wireless translating repeaters
InactiveUS6370384B1Radio/inductive link selection arrangementsRadio transmission for post communicationTransceiverCommunications system
A novel improved frequency re-use planning which allows the most efficient bandwidth utilization and a larger coverage area in a wireless communications network utilizing translating repeaters is described. The wireless communications network has an available radio frequency bandwidth divided into a number of radio frequency communication channels. The channel assignments according to the frequency re-use plan described by this invention makes possible to achieve larger service coverage area using one or more base transceiver system, and efficient utilization of the limited bandwidth allocated to the network. According to the inventive frequency re-use planning, two adjacently located frequency channels are utilized while still meeting the signal isolation requirement between the adjacent channels by assigning the adjacent channels to cells that are remotely located from each other.
Owner:RATEZE REMOTE MGMT LLC +1
Combined sensing methods for cognitive radio
ActiveUS20080198948A1Television system detailsModulated-carrier systemsFrequency spectrumEngineering
Embodiments of cognitive radio technology can recover and utilize under-utilized portions of statically-allocated radio-frequency spectrum. A plurality of sensing methods can be employed. Transmission power control can be responsive to adjacent channel measurements. Digital pre-distortion techniques can enhance performance. Embodiments of a high DNR transceiver architecture can be employed.
Owner:SILICONWAVES TECH CO LTD
Tuned tensile stress low resistivity slot contact structure for n-type transistor performance enhancement
InactiveUS20080157224A1TransistorSemiconductor/solid-state device detailsDeposition temperaturePerformance enhancement
A method for forming a slot contact structure for n-type transistor performance enhancement. A slot contact opening is formed to expose a contact region, and a barrier plug is disposed within a portion of the slot contact opening in order to induce a tensile stress on an adjacent channel region. The remainder of the slot contact opening is filled with a lower resistivity contact metal. Barrier plug deposition temperature can be varied in order to tune the tensile stress on the adjacent channel region.
Owner:INTEL CORP
Method and circuit arrangement for improving carrier separation for the transmission of OFDM signals
InactiveUS6088327AEasy to receiveEasy to separateMulti-frequency code systemsOrthogonal multiplexFast Fourier transformFrequency spectrum
PCT No. PCT / EP96 / 02209 Sec. 371 Date Nov. 17, 1997 Sec. 102(e) Date Nov. 17, 1997 PCT Filed May 23, 1996 PCT Pub. No. WO96 / 41458 PCT Pub. Date Dec. 19, 1996In the case of the OFDM method, a large number of modulated carriers are transmitted using frequency division multiplexing, a spectrum having a virtually rectangular shape being produced as a result of the large number of carriers. In order to separate the carriers from one another again in the receiver, a Fast-Fourier-Transformation is carried out, it then being possible to separate each carrier cleanly from the others provided the carriers are exactly orthogonal with respect to one another. The carrier orthogonality can, however, be disturbed by various causes. Furthermore, the wanted signal must be separated from the undesired adjacent channel signals by analog or digital filtering in the receiver. In order to improve carrier and channel separation, the selectivity of the FFT filtering can be increased by enlarging the number of FFT components. However, this normally leads to an undesirably sharp increase in the computation complexity. The refinement according to the invention of the time window which is used for the FFT and the oversampling before the FFT make it possible, however, to dispense with calculation of some of the coefficients.
Owner:DEUTSCHE THOMSON-BRANDT GMBH
Gallium nitride material transistors and methods associated with the same
ActiveUS20050167775A1Semiconductor/solid-state device manufacturingSemiconductor devicesPower applicationSignal quality
Gallium nitride material transistors and methods associated with the same are provided. The transistors may be used in power applications by amplifying an input signal to produce an output signal having increased power. The transistors may be designed to transmit the majority of the output signal within a specific transmission channel (defined in terms of frequency), while minimizing transmission in adjacent channels. This ability gives the transistors excellent linearity which results in high signal quality and limits errors in transmitted data. The transistors may be designed to achieve low ACPR values (a measure of excellent linearity), while still operating at high drain efficiencies and / or high output powers. Such properties enable the transistors to be used in RF power applications including third generation (3G) power applications based on W-CDMA modulation.
Owner:MACOM TECH SOLUTIONS HLDG INC
System and method for displaying advertising in an interactive program guide
InactiveUS7634789B2Raise the possibilityTelevision system detailsAnalogue secracy/subscription systemsScrollingAdjacent channel
An interactive program guide containing schedule data for multiple channels and advertising data is provided to viewers on a screen. The advertising may be related to the programs adjacent thereto in the guide and to time slots displayed on the screen. The advertising srolls in various directions in response to the viewer's scrolling of the grid, but at a different pace and according to a different scheme than the scrolling of the schedule data itself. For example, the advertising may remain on the screen in a predetermined location while the viewer scrolls the schedule data, and then scroll off the screen to be replaced by new ads after a predetermined number of channels scroll off the screen, or on the basis of time slots and / or adjacent channels displayed on the screen. This provides for greater viewer attention to the advertising and for greater control by advertisers over the manner and length in which advertising is presented to viewers.
Owner:CUMNOR TECH
Flat-plate heat pipe containing channels
ActiveUS20070056714A1Efficient vapor distributionImprove cooling effectSemiconductor/solid-state device detailsSolid-state devicesEngineeringCapillary action
Heat from a heat generating device such as a CPU is dissipated by a heat spreader containing a cycled two-phase vaporizable coolant. The coolant cycles inside a closed metal chamber, which has an upper section and a lower section. The lower section contains a wick layer, a part or parts of which serves as an evaporator. The upper section is composed of a set of channels. The channel walls contain a plurality of cut-off openings over the evaporator region to allow for vapor distribution efficiently. The liquid coolant in the evaporator is vaporized by the heat from the heat generating device. The coolant vapor can prevail in the channels by either directly entering the adjacent channels or indirectly through lateral conduits formed with the wall openings. The vapor condenses on the channel, walls to liberate latent heat which is then dissipated out through the top chamber wall. The condensed coolant is directly collected by the lower-section wick and further flows back to the wick evaporator by capillary action, thereby cycling the coolant.
Owner:NATIONAL TSING HUA UNIVERSITY
Molded sportsball without molding mark and manufacturing method thereof
InactiveUS20090011878A1Simple manufacturing processReduce manufacturing costHollow inflatable ballsHollow non-inflatable ballsEngineeringAir cavity
A sportsball includes a ball carcass having an air cavity therein, wherein the ball carcass includes two ball shells, each of the ball shells having an outer surface, a plurality of channels indented on the outer surface to form a plurality of panel contours thereon, and a contouring edge defining a starting point at one of the channels to continuously extend from the channel to another the adjacent channel until the contouring edge is extended back to the starting point, wherein the two ball shells are integrally bonded with each other to form the ball carcass that the contouring edges of the ball shells are alignedly linked to form a common edge of the ball carcass, such that the common edge of the ball carcass, which is a molding line thereof, also forms as the channels of the ball carcass to invisible the molding line thereat.
Owner:OU TSING MING
Temperature compensation of collector-voltage control RF amplifiers
ActiveUS20090115520A1Reduce phase distortionAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersFrequency spectrumControl signal
A temperature compensation system for compensating a collector-voltage controlled RF amplifier. To overcome variation that occurs with temperature which can result in signal degradation of the adjacent channel spectrum, a temperature compensated current is utilized to create an offset signal. The offset signal is processed in connection with a control or data signal to generate a temperature compensated voltage source control signal. A differential amplifier may process the data or control signal and the offset signal. The compensated voltage control signal tracks temperature to adapt the applied collector voltage to temperature. This in turn forces the applied collector voltage to vary in response to temperature changes thereby maintaining a constant output power or RF swing. One example environment of use is in an EDGE type GSM system.
Owner:SKYWORKS SOLUTIONS INC
Gallium nitride material transistors and methods associated with the same
ActiveUS7135720B2Semiconductor/solid-state device manufacturingSemiconductor devicesPower applicationSignal quality
Gallium nitride material transistors and methods associated with the same are provided. The transistors may be used in power applications by amplifying an input signal to produce an output signal having increased power. The transistors may be designed to transmit the majority of the output signal within a specific transmission channel (defined in terms of frequency), while minimizing transmission in adjacent channels. This ability gives the transistors excellent linearity which results in high signal quality and limits errors in transmitted data. The transistors may be designed to achieve low ACPR values (a measure of excellent linearity), while still operating at high drain efficiencies and / or high output powers. Such properties enable the transistors to be used in RF power applications including third generation (3G) power applications based on W-CDMA modulation.
Owner:MACOM TECH SOLUTIONS HLDG INC
Source grating for talbot-lau-type interferometer
InactiveUS20100260315A1High X-ray transmittanceSufficient quantityImaging devicesX-ray spectral distribution measurementGratingX-ray
A source grating for a Talbot-Lau-type interferometer includes a plurality of channels having incident apertures provided on a side irradiated with X-rays and exit apertures provided on an opposite side of the side irradiated with the X-rays; the exit apertures of the channels have an aperture area smaller than an aperture area of the incident apertures; and the exit apertures of the channels are arranged so that interference fringes of Talbot self-images formed by X-rays exiting from the exit apertures of the adjacent channels are aligned with each other.
Owner:CANON KK
Wavelength-multiplexed narrow-bandwidth optical transmitter and wavelength-multiplexed vestigial-side-band optical transmitter
InactiveUS20040208428A1Reduce in quantityImprove featuresWavelength-division multiplex systemsCoupling light guidesMultiplexerSideband
Objects of the present invention are to reduce the number of optical filters, and to improve crosstalk characteristics of periodic optical filters. WDM signals are converted into vestigial-side-band signals collectively using a periodic optical filter. As an example, light signals having odd number wavelengths (wavelengths lambda1, lambda3, lambda5) and light signals having even number wavelengths (wavelengths lambda2, lambda4, lambda6) are wavelength-multiplexed in the first optical wavelength multiplexer, and are then filtered by a periodic narrow band-pass optical filter to convert the light signals into vestigial-side-band (VSB) signals. Then, the vestigial-side-band signals are combined by the second optical wavelength multiplexer. Such an interleave configuration enables suppression of crosstalk caused by adjacent channels.
Owner:HITACHI LTD
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