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2930results about How to "Reduce bit error rate" patented technology

Apparatus, system, and method for storage space recovery after reaching a read count limit

An apparatus, system, and method are disclosed for storage space recovery after reaching a read count limit. A read module reads data in a storage division of solid-state storage. A read counter module then increments a read counter corresponding to the storage division. A read counter limit module determines if the read count exceeds a maximum read threshold, and if so, a storage division selection module selects the corresponding storage division for recovery. A data recovery module reads valid data packets from the selected storage division, stores the valid data packets in another storage division of the solid-state storage, and updates a logical index with a new physical address of the valid data.
Owner:UNIFICATION TECH LLC

Method and apparatus for transmitting a signal using thermal chirp management of a directly modulated transmitter

ActiveUS20050111852A1Reduce thermal chirp of optical signalReducing “ overshoot ”Coupling light guidesElectromagnetic transmittersChirpLight source
A fiber optic transmitter comprising a digital driver adapted to adjust the crossing point of a digital base signal, an optical source adapted to receive the digital base signal and produce a frequency modulated optical signal, and an optical spectrum reshaper adapted to convert the frequency modulated optical signal to an amplitude modulated optical signal. A method for transmitting a signal, comprising: adjusting the crossing point of a digital base signal; providing the adjusted signal to an optical source to produce a frequency modulated optical signal; and providing the frequency modulated optical signal to an optical spectrum reshaper to convert the frequency modulated optical signal to an amplitude modulated optical signal.
Owner:II VI DELAWARE INC

Mimo signal processing method involving a rank-adaptive matching of the transmission rate

A bidirectional signal processing method uses parallel transmission of digital transmitted data streams in a multiple input-multiple output system. Related art methods generate high bit error rates mostly in singular transmission channels. For this reason, the rank-adaptive signal processing method provides that the number nd of active subchannels are varied according to the actual channel behavior in order to effect a robust data transmission even in singular radio channels based on a transmit-side and receive-side channel knowledge and a modification of the data vector by a linear matrix vector multiplication while introducing a factor gamma for limiting the maximum transmit power. The maximum transmit power is then only distributed to the currently activated subchannels so that no transmit power remains unused. Another optimization of the number of subchannels nd occurs when selecting the modulation and encoding methods. During the optimal rank-adaptation according to the water-filling principle, another power is allocated to each subchannel. Another modulation and encoding method is accordingly selected for each data stream. During the suboptimal rank-adaptation according to the channel inversion principle, all subchannels have the same power whereby enabling the data streams to be modulated and encoded in a common source
Owner:SIEMENS AG

MIMO signal processing method involving a rank-adaptive matching of the transmission rate

A bidirectional signal processing method uses parallel transmission of digital transmitted data streams in a multiple input-multiple output system. Related art methods generate high bit error rates mostly in singular transmission channels. For this reason, the rank-adaptive signal processing method provides that the number nd of active subchannels are varied according to the actual channel behavior in order to effect a robust data transmission even in singular radio channels based on a transmit-side and receive-side channel knowledge and a modification of the data vector by a linear matrix vector multiplication while introducing a factor gamma for limiting the maximum transmit power. The maximum transmit power is then only distributed to the currently activated subchannels so that no transmit power remains unused. Another optimization of the number of subchannels nd occurs when selecting the modulation and encoding methods. During the optimal rank-adaptation according to the water-filling principle, another power is allocated to each subchannel. Another modulation and encoding method is accordingly selected for each data stream. During the suboptimal rank-adaptation according to the channel inversion principle, all subchannels have the same power whereby enabling the data streams to be modulated and encoded in a common source.
Owner:SIEMENS AG

Method for constructing Polar-LDPC concatenated codes

The invention provides a method for constructing Polar-LDPC concatenated codes. The method serially concentrates Polar codes as outer codes and LDPC codes as inner codes and is characterized by comprising the following steps of (1) carrying out coding operation of an information sequence (img file='DDA000402432330000011.TIF' wi='63' he='64' / ) through a generated matrix according to encoding rules of Polar codes to obtain an information sequence (img file='DDA000402432330000012.TIF' wi='86' he='81' / ); (2) encoding an information sequence (img file='DDA000402432330000013.TIF' wi='66' he='84' / ) after Polar code encoding according to LDPC codes to obtain an information sequence (img file='DDA000402432330000014.TIF' wi='88' he='64' / ) to be sent to a channel for information transmission; (3) receiving an information sequence (img file='DDA000402432330000015.TIF' wi='105' he='80' / ) from the channel and sending the information sequence to LDPC code decoding, and decoding the information sequence using a BP iterative decoding algorithm to obtain an information sequence (img file='DDA000402432330000016.TIF' wi='95' he='84' / ); and (4) sending an information sequence (img file='DDA000402432330000017.TIF' wi='64' he='67' / ) obtained after LDPC code decoding and sending the information sequence to a Polar code decoder to obtain an information sequence (img file='DDA000402432330000018.TIF' wi='96' he='72' / ) using a continuous deletion decoding algorithm. The novel concatenated codes have better decoding performances and fewer error floors, and can be applied to fields of deep space communication, image transmission and the like.
Owner:CHINA AGRI UNIV

Polarization compensation implementation method of continuous variable quantum key distribution system

The invention discloses a polarization compensation implementation method of a continuous variable quantum key distribution system. The polarization compensation implementation method comprises the following detailed steps that: a transmitting end transmits signal light and local oscillator light through one optical fiber by adopting a polarization multiplexing manner, and a receiving end separates the signal light and the local oscillator light by a polarization beam splitter, wherein a polarization feedback control method is divided into two stages, to be specific, in the light splitting detection stage, the receiving end for distribution of continuous variable quantum keys separate a part of local oscillator light out and covers the local oscillator light into a DC feedback voltage signal through a conversion circuit; and in the polarization correction stage, the receiving end controls a dynamic polarization controller by a feedback algorithm according to the DC feedback voltage to finish polarization correction. The brand-new polarization feedback control implementation method of the continuous variable quantum key distribution system, provided by the invention, has the advantages of effectively preventing the polarization state of continuous variable quantum signals from being subjected to environment interference in the optical fiber communication process, improving the system stability and promoting the practicability of the continuous variable quantum keys.
Owner:SHANGHAI JIAODA INTELLECTUAL PORPERTY MANAGEMENT CO LTD +1

Backscattering communication modulation method based on orthogonal frequency division multiplexing (OFMD) carriers

The invention belongs to the technical field of communication, and relates to a backscattering communication modulation method based on orthogonal frequency division multiplexing (OFMD) carriers The modulation method provided by the invention is characterized in that the modulation method is applied to a backscattering communication system comprising a radio frequency source, a reader and a tag, and comprises the following main steps: a radio frequency source transmits an OFDM carrier signal to a tag; the tag receives the OFMD signal, the tag also comprises a backscattering antenna and a radio frequency energy collection module, the radio frequency energy collection module is used for collecting energy of the OFDM signal in a tag environment, and the backscattering antenna is used for sending information bits to the reader; and the reader receives and decodes a backscattering signal from the tag. The modulation method provided by the invention has the beneficial effects that compared with traditional designs, a specified wireless signal does not need to be sent to serve as the carrier, and higher energy efficiency, a lower bit error rate and a higher data rate can be achieved.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Antenna multiplexing system and method of smart antenna and multiple-input multiple-output antenna

An antenna multiplexing system and a method of a smart antenna and a Multiple-Input Multiple-Output antenna are provided, wherein the system includes a MIMO antenna array and a smart antenna array, the smart antenna array includes several groups of antenna array elements in which the distance between neighbor antenna array elements is less than or equal to one half of wavelength, and the smart antenna array comprises at least two groups of antenna array elements with the coherence sufficient for the requirement of the MIMO applications. The method includes: in accordance with the type of the data to be transmitted, determining a transmitting mode and processing the data to be transmitted accordingly, and in accordance with the transmitting mode, controlling the MIMO antenna array or smart antenna array, so as to transmitting the data to the mobile terminal. With the premise that the actual coverage of TD-SCDMA system should be further improved, the requirement of higher user throughout could be met, and the MIMO antenna system could satisfy the requirement of the future system evolution. Both of the applications of the MIMO and the smart antenna could be met with the use of the same antenna feeding system, and the adaptive switching of the MIMO and the smart antenna with respect to the user could be achieved.
Owner:CHINA MOBILE COMM GRP CO LTD

Data processor system for space-based measurement and control of high-speed aircraft

The invention relates to a data processor system for space-based measurement and control of a high-speed aircraft. The data processor system comprises a power supply module, an interface module, a control module, an encryption module, a forward processing module and a reverse processing module, wherein the power supply module is used for providing the secondary power source for the other modules; the control module is used for receiving control instructions, and sending the control instructions to the other modules; the encryption module is used for encrypting the reverse data stream and decrypting the forward data stream respectively; the forward processing module is used for receiving the mid-frequency signal, completing the receiving and processing link, recovering forward information, and outputting the forward information to an external device through the interface module; the reverse processing module is used for receiving image data, flight state information and remote measurement information, generating the mid-frequency signal after completing the launching and processing link to output the mid-frequency signal to an external radio frequency front end, and eventually sending the mid-frequency signal to a ground system. The data processor system supports the carrier high-dynamic measurement and control of the aircraft, is large in region coverage, supports multiple users, can realize real-time two-way communication with the aircraft, and has certain interference capability.
Owner:SPACE STAR TECH CO LTD

Method for implementing partner selection and collaboration transmission combining position information

The invention provides a method for realizing partner selection and cooperative transmission combining with position information. The method is to obtain the position information of each node by directly using a cooperative positioning technology of a cooperative communication system and provide a partner selection strategy according to the large-scale fading condition of information transmission: an information source firstly calculates a distance between the information source and each candidate trunk node; the information source adds the distance between the information source and each trunk node and the distance between each trunk node and a base station by combining the obtained position information of each candidate trunk node and the distance information between the candidate trunk node and the base station; the information source selects a trunk node with the minimum total distance value of a trunk information channel as a cooperative partner of the information source to help the information source transmit information, after the total distance value of the trunk information channel of each trunk node is known, thereby realizing gain of space diversity reception, reducing path loss, and achieving the aims of reducing the bit error probability during transmitting, improving the signal quality and expanding the network coverage.
Owner:BEIJING UNIV OF POSTS & TELECOMM
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