184results about "Frequency-division multiplexing selection" patented technology

A multimedia speaker headphone has a headband, two ear-covers and a control and transmission device. The ear-covers are mounted pivotally on the headband and each ear-cover has an earphone speaker and an audio speaker. The control and transmission device has a controller and a transmission apparatus. The controller is connected one of the ear-covers and has a switch to selectively switch on the earphone speakers or the audio speakers. The transmission device has at least one transmission cord having a terminal. The earphone speakers and audio speakers allow a user to listen to music with or without wearing of the multimedia speaker headphone.

A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating preceding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined preceding scheme.

A user terminal connection control method to limit the number of sessions simultaneously connectable to the Internet, wherein an access server or authentication server has a user management table for specifying the maximum number of connections and a preferential terminal identifier indicating a user terminal to be preferentially connected to the Internet for each group comprising a plurality of user identifiers. The access server or authentication server determines, during a communication procedure for authenticating a user who requests to access to the Internet, whether the current number of connections for a group to which the user belongs has reached the maximum number of connections, and if so, determines whether to allow the user terminal to connect to the Internet depending on whether the user terminal identifier matches the preferential terminal identifier.

A few high power tones used for synchronization and / or other purposes are transmitted in a FDM system during a period of time, e.g., a symbol transmission time period. During normal data transmission symbol periods signals are transmitted using at least 10 tones, e.g., per symbol time. Less than 5 high power signals are transmitted in a symbol time with at least 80% the maximum total transmitter power transmitted being allocated to the high power signals where the maximum total transmitter power is determined from a period of time which may includes one or more data and / or high power tone transmission periods. When the high power tones are transmitted at most 20% of transmitter power is available for transmitting other tones with the power normally being distributed among multiple tones. Normally some tones which would be transmitted in a symbol time go unused during transmission of the high power signals.

A secure gateway is disclosed which facilitates communication between a first network and a second network through an intermediate network. The secure gateway, when operated in conjunction with at least one other secure gateway, supports secure peer to peer connectivity with integral security features such as mutual authentication, authorization specific access, and end to end auditing. An authorized service can be served securely through this gateway, across the open network, to a known requester, without fear of compromising the security or privacy of the server's or requesters networks.

A hybrid coaxial cable network employing interdiction to ensure privacy in telephony communications. The video and telephony signals are secured such that telephony and interactive video signals to and from a subscriber do not appear on the network at any other undesired subscriber location.

A method and apparatus of transmitting a feedback message in a wireless communication system is provided. A mobile station receives information on a first period and a second period from a base station and transmits a first feedback message in every first period or a second feedback message in every second period to the base station over a primary fast feedback channel (PFBCH). The first feedback message comprises a channel quality indicator (CQI) for a subband selected from a plurality of subbands, and the second feedback message comprises a subband index of the selected subband.

The Intelligent Multiservice Access System (IMAS) enables support for the next generation of virtual connections. Regardless of whether the communications lines coupled to the inputs and outputs of the IMAS are based on SVC, PVC, or a combination of PVC and SVC, the IMAS can support SVCs for a more flexible, timely, efficient, and manageable connection. In the more typical configuration, the loop side of the IMAS is PVC-based because the modems do not support SVC signaling, and the telecommunications backbone side is capable of supporting SVC signaling even though existing DSLAMs do not employ SVC signaling logic. With SVC support, the IMAS assists the ATM network in hand crafting an SVC-based connection almost immediately between end users when the originating end user wants to make a call to a destination end user, and tear down that virtual connection almost immediately when that call has completed. The SVC signaling is performed by a proxy signaling agent that resides in the IMAS to give the appearance to the ATM network in the telecommunications backbone that the loop side supports SVC signaling even though the line is PVC-based.

A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

In an OFDM communication system that performs OFDM data communication by dividing a band region into a plurality of bands and assigning each band to a mobile station, a base station monitors transmission characteristics of the bands and state of use of adjacent bands, then sets whether to use or not use guard band regions between bands for data transmission based upon the transmission characteristics, and the state of use of the adjacent bands.

A diversity OFDM communication is performed between a base terminal and a mobile terminal, both having a horizontal polarization antenna and a vertical polarization antenna forming two transmission channels. In the base terminal, data signals to be transmitted are divided into two channels to transmit the data signals through either one of the channels having a higher transmission performance for each sub-carrier. Common pilot signals are transmitted through both channels. The data signals received by the mobile terminal are phase-adjusted using the common pilot signals. The phase-adjusted data signals in both channels are synthesized and then demodulated.

The present invention provides reduced power dissipation and other benefits at the optical transport network layer by utilizing a digital subcarrier optical network comprising multiple digital subcarrier cross-connect switches. This offers several advantages for optical networks, including spectral efficiency and robustness against signal corruption and consumption of less energy than traditional TDM-based electric switches (OTN / SONET / SDH).

This invention relates to LANs at a customers' premise, especially to the HomePNA technique. The idea of the invention is that voice band terminals and HomePNA (HPNA) stations are hidden from a distribution network by a band division filter in a way that performance of ADSL is not degraded by presence of an HPNA LAN. The band division filter incorporates two subfilters: a POTS filter and an HPNA filter. The latter implements a band stop function maximizing insertion loss at the ADSL band The band division filter can be installed to needed telephone sockets.

Various devices are provided for conveniently storing, transporting and recharging wireless headsets and associated devices. According to some embodiments, a dongle is formed to receive a portion of a wireless headset, thereby bringing together electrical contacts of the dongle and electrical contacts of the wireless headset, thereby permitting convenient recharging of the wireless headset. In some embodiments, a dongle is integrated into a holster or carrying case for a wireless headset and / or an external device such as a telephone.

The present invention relates to an arrangement and method for providing wireless data communication services, between a client station (10) and a service providing station (15) and / or a computer network (13, 33), each of the client station (12), service providing station (15) or the computer network (13, 33) being connected to at least one radio transceiver (11, 12) and each being arranged with means (20, 30, 31) to convert data to be transmitted to data packets or data packets to data. The radio transceiver (11, 12) is arranged to transmit and / or receive data packets with at least one predetermined, by a user determined or randomly selected low radio frequency, said low radio frequency being within a range of about 1 kHz to about 30 MHz, preferably one or several of: 100-1800 kHz, 1810-1850 kHz, 3500-3800 kHz, 7000-7100 kHz, 10100-10150 kHz, 14000-14350 kHz, 18068-18168 kHz, 21000-21450 kHz, 24890-24990 kHz and 28000-29700 kHz bands.

A communication system is provided herein for transmitting frames across a channel. The frames may be transmitted in single-input, single-output (SISO) and / or multi-input, multi-output (MIMO) communication systems. One such frame includes at least one training symbol, each having a cyclic prefix and a training block. The time length NI of the training block is equal to an integer fraction I of the time length of a data block, i.e., NI=N / I. Furthermore, the time length G of the cyclic prefix is an integer fraction of the time length NI. For example, G may be equal to NI / 4 or 25% of NI. The training symbols provide coarse and fine time synchronization, coarse and fine frequency synchronization, channel estimation, and noise variance estimation.

The method for reducing the rate of registration in CDMA-based mobile networks is a method for preventing a traveling mobile device from registering within a new, or secondary, registration area, prior to physically relocating from a first, or current, registration area to the new registration area. The mobile device has a storage memory associated therewith, for storing a database containing geographic coordinates defining boundaries of a plurality of registration areas. The mobile device scans for a new registration pilot signal associated with a new registration area, and upon detection, the geographic location of the mobile device is determined. This geographic location is compared with the coordinates of the boundaries stored within the database, and if the mobile device is determined to be within the boundary defining the new registration area, the mobile device is then registered with a base station of the new registration area.

An OFDM system embeds sequence information in the transmitted signal that reduces peak average power ratio (PAP) with minimal impact on the overall system efficiency. A marker is embedded onto the transmitted information that is used to identify the combining (inversion) sequence at the receiver. In one embodiment, selected tones in a cluster are rotated when the corresponding phase factor rotates the cluster.

A secure gateway is disclosed which facilitates communication between a first network and a second network through an intermediate network. The secure gateway, when operated in conjunction with at least one other secure gateway, supports secure peer to peer connectivity with integral security features such as mutual authentication, authorization specific access, and end to end auditing. An authorized service can be served securely through this gateway, across the open network, to a known requester, without fear of compromising the security or privacy of the server's or requesters networks.

A semi-persistent scheduling method and apparatus based on statistically multiplexing in time and frequency resources, the method comprises steps of: allocating each initial transmission to use fixed time and frequency resources reserved for initial transmission by using a persistent grant, and allocating each retransmission to use time resource reserved for retransmission by using a persistent grant and dynamically allocating each retransmission to use frequency resource reserved for retransmission by using a dynamic grant or a default grant, wherein the initial transmission and the retransmission share the frequency resources within the same time slot.

The present invention provides an optical wavelength-division multiple access system and a corresponding optical network unit. A wavelength band Da (wavelengths λd1 to λdn) for downlink optical signals corresponding to the n ONUs, a wavelength band Ua (wavelengths λu1 to λun) for uplink optical signals corresponding to the n ONUs, a wavelength band Db (wavelengths λdn+1 to λdn+m) for downlink optical signals corresponding to the m ONUs, and a wavelength band Ub (wavelengths λun+1 to λun+m) for uplink optical signals corresponding to the m ONUs are set different from one another, the wavelength bands Ua and Ub are set adjacent to each other, and the wavelength bands Ua and Da or the wavelength bands Ub and Db are set adjacent to each other. Each of the ONUs has downlink optical signal receiving unit for receiving a downlink optical signal of one of the wavelengths λd1 to λdn+m in the wavelength bands Da and Db which wavelength is assigned to the ONU, and uplink optical signal receiving unit for receiving an uplink optical signal of one of the wavelengths λu1 to λun+m in the wavelength bands Ua and Ub which wavelength is assigned to the ONU or an uplink optical signal within a broad band including the wavelength bands Ua and Ub.

The invention provides a vehicle to everything (V2X) business transmission method and device, and a resource allocation method and device. The V2X business transmission method includes that a first onboard unit OBU acquires the transmission resources for transmitting the V2X business, the transmission resources include the resources required to send the V2X business data and scheduling information in the V2X business, the scheduling information refers to the information indicating the resource scheduling of the V2X business data, the first OBU transmits the scheduling information and the V2X service data to the second OBU on the transmission resources, the scheduling information and the V2X business data are subjected to frequency domain multiplexing in the same subframe in the transmission resources and the scheduling information indicates that the V2X business data is subjected to resource allocation in the same and / or different subframes. According to the invention, the problem that the D2D technology in the prior art can only send the resource scheduling information and V2X business data separately is solved, and the gaps in the relevant technology are filled.

A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating precoding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined precoding scheme.

A frequency hopping sequence generator system (40) for use in a radio telecommunications system utilizes variable frequency offsets (FO) to determine a frequency hopping sequence for use in communication between a mobile station and a network node. The frequency hopping sequence generator comprises a frequency offset hopping generator (42) which chooses the variable frequency offsets so that the frequency hopping sequence provides intra-cell interference diversity. For each mobile station, the frequency offset hopping generator determines a frequency offset index (FOI) which is mapped to one of plural possible frequency offsets (FO). The frequency offset index (and thus the corresponding frequency offset) is determined to provide the frequency hopping sequence with both interference diversity and orthogonality. The frequency offset index has a first component and a second component. The first component of the frequency offset index is an inter-cell component that provides, e.g., collision diversity between FO hopping sequences that are not orthogonal. The second component is an intra-cell component that provides orthogonal (non-colliding) sequences with a variable difference between two sequences. The intra-cell component sub-generator can operate in either a “short sequences” mode or a “long sequences” mode. The long sequences mode renders adjacent frequency collision rates between two sequences with equal FOHSN independent of the choice of the two different FOSEEDs selected. On the other hand, the short sequences mode yields higher collision rates between certain pairs than between other pairs.

The present disclosure generally pertains to systems and methods for communicating data. In one exemplary embodiment, a system has a high-speed channel, such as an optical fiber, between a network facility, such as a central office (CO), and a first intermediate point between the network facility and a plurality of customer premises (CP). Digital communication links, such as DSL links, are used to carry data between the first intermediate point, such as a feeder distribution interface (FDI), and a second intermediate point, such as the Distribution Point (DP). Non-shared links may then carry the data from the second intermediate point to the CPs. The links between the two intermediate points are bonded to create a high-speed, shared data channel that permits peak data rates much greater than what would be achievable without bonding. In some embodiments, multicast data flows may be prioritized and transmitted across a set of connections to each of the intermediate points. In addition, it is possible to power components at the intermediate points from one or more of the CPs.

A multi-port DSL system terminates a plurality of DSL channels that are multiplexed through a data path of a DSL transceiver. In one embodiment, data path events are generated based on the data transmission in each of the channels. When the data path becomes available to process a next data symbol, the data path processes a data symbol for the channel indicated by the data path events. Optionally, the data path may process a data symbol for a particular channel only if a predetermined amount of time has elapsed since a data symbol was processed for that data channel.

The present invention provides a method for transmitting reference signals comprising: during carrier aggregation, a user equipment sending physical uplink shared channel (PUSCH) on one or more component carriers, and sending demodulation reference signals (DM RS) for the PUSCH on each section of bandwidth occupied by the PUSCH on each component carrier, wherein a DM RS sequence on a section of bandwidth is an independent sequence or part of an independent sequence and forms an independent sequence with DM RS sequences on multiple sections of bandwidth other than the section of bandwidth; the section of bandwidth is a section of continuous bandwidth occupied by the PUSCH on any component carrier, or is any of the multiple sections of bandwidth occupied by the PUSCH on any component carrier. The Present invention further provides a corresponding apparatus.

There is disclosed a method of carrying frame based data, eg Ethernet data, over a synchronous digital hierarchy network in order to provide local area network type functionality over a wide area network coverage. Specific embodiments disclose methods of mapping Ethernet data frames into SDH virtual containers, and distinguishing start and end boundaries of the Ethernet data frames within the virtual container payloads, by a selection of encoding methods including a segmentation, pointer methods, bit stuffing methods and byte stuffing methods. Data frames are encoded with a code which designates a boundary of each frame, and the encoded frames are input into a synchronous data channel.

A method and apparatus for modifying a cable network to create a local area network is disclosed. By employing a communications modem configured to transmit first communication signals over one or more coaxial cables using a first allocated spectrum designed to avoid contention with ongoing upstream television control signals, an infrastructure capable of carrying demand cable television and LAN signals can be created.

An interleaver and interleaving method each includes two stages, and is useful in coded orthogonal frequency division multiplexed (COFDM) wireless local area networks. A first stage performs a first block permutation and a second stage performs bit order permutation to effectuate a second group permutation. A corresponding de-interleaver does just the opposite at the receiver. A double-buffer version includes writing data into one memory block in a first order while reading data from the second block in a second order, with the first and second orders selected to effectuate the first block permutation.