Huawei Technologies Co., Limited

Politecnico Di Torino

Other

European Space Agency

Telefonaktiebolaget Lm Ericsson (Publ)

Guido Montorsi

Sergio Benedetto

Yan Xin

Wei Bin Lin

Min Yan

Wei Lin

Frank J Effenberger

Dongyu Geng

Dongning Feng

Le Liu

Jing Tian Li

Raymond W K Leung

Yi Luo

Farbod Kayhan

Ming Gan

Jian Yu

Jian Ding

Osama S Aboul-Magd

Jung Hoon Suh

Huang Huang

Jun Zhu

Mats Rydström

Weishan Lu

Xi Yan

Stefano Chinnici

Weiguang Liang

Nader Alagha

Alberto Tarable

Method and system method comprising encoding a source word to be transmitted in a data unit from a source station in a wireless network, generating a first OFDM symbol that carries a data segment corresponding to encoded bits of the source word, duplicating the first OFDM symbol to generate a second OFDM symbol that is a linear phase-rotated copy of the first OFDM symbol; and transmitting the data unit including the first OFDM symbol and the second OFDM symbol.

Data transmission for low power indoor wireless network

The present disclosure relates to low-density parity-check (LDPC) encoding methods and apparatus. One example method includes obtaining k information bits to be sent to a receive end, performing LDPC encoding on the k information bits by using a submatrix of ((n−k)/Z+j) rows and (n/Z+j) columns at an upper left corner of a check matrix H based on a first transmission code rate R satisfying R=k/(n+j×Z), obtaining a first codeword including the k information bits and (n−k+j×Z) redundant bits, and sending the first codeword to the receive end.

Low-density parity-check (LDPC) encoding method and apparatus

This application provides an LDPC code encoding method and a communication apparatus, to meet a requirement of increasing redundant bits through retransmission in an IR-HARQ mechanism, so as to decrease a channel coding rate, and improve decoding performance of an LDPC code. In the method, a check matrix of the LDPC code is used as a basic matrix, and the basic matrix is extended to obtain a mother matrix compatible with a plurality of code rates. During LDPC encoding, a transmit device reads, from the mother matrix, a check matrix corresponding to a required code rate, and performs LDPC encoding on an information bit sequence based on the read check matrix. LDPC encoding is performed on the information bit sequence by using check matrices of different sizes, to obtain different quantities of redundant bits.

Low density parity check code encoding method and communication apparatus

Method and system method performed at a wireless transmitting station, including generating a first low density parity check (LPDC) codeword for a first source word for a first transmission, and generating a second LDPC codeword for a retransmission for the first LDPC codeword, the second LDPC codeword including a permutated subset of information bits included in the first LDPC codeword and parity check bits corresponding to the permutated subset of information bits.

Permutated extension and shortened low density parity check codes for hybrid automatic repeat request

A modulation method, including: modulating data by using a non-uniform constellation; and sending the modulated data. When the non-uniform constellation provided in embodiments of this application is used, for each noise standard deviation, a BER of the non-uniform constellation provided in embodiments of this application is lower than a BER of an existing QAM constellation.

Modulation method and apparatus

The present disclosure relates to low-density parity-check (LDPC) encoding methods and apparatus. One example method includes encoding k information bits by using a submatrix of ((n−k)/Z+j) rows and (n/Z+j) columns at an upper left corner of a check matrix H based on a first transmission code rate R satisfying R=k/(n+j×Z), obtaining a first codeword including the k information bits and (n−k+j×Z) redundant bits, and sending the first codeword to a receive end.

A low-density parity-check (LDPC) code encoding method and a communication apparatus are described that provide increased redundant bits through retransmission in an IR-HARQ mechanism, so as to decrease a channel coding rate, and improve decoding performance of an LDPC code. A check matrix of the LDPC code is used as a basic matrix, and the basic matrix is extended to obtain a mother matrix compatible with a plurality of code rates. During LDPC encoding, a transmit device reads, from the mother matrix, a check matrix corresponding to a required code rate, and performs LDPC encoding on an information bit sequence based on the read check matrix. LDPC encoding is performed on the information bit sequence by using check matrices of different sizes, to obtain different quantities of redundant bits.

LDPC code encoding method and communication apparatus

A convolutional code rate matching method and a communication apparatus are provided. A puncturing pattern of a second codeword at a second code rate is obtained based on a puncturing pattern of a first codeword at a first code rate. A second puncturing location set of the second codeword is a subset of a first puncturing location set of the first codeword. When a transmit device decreases a code rate from the first code rate to the second code rate, a redundant bit is sent at a location of a complementary set of the second puncturing location set relative to the first puncturing location set. Compared with the first puncturing location set, the second puncturing location set may obtain more incremental redundant bits, to decrease a channel encoding rate. This can improve decoding performance of a convolutional code.

Convolutional code rate matching method and wireless communication apparatus

Methods and devices are disclosed for encoding source words and decoding codewords with LDPC matrices, comprising: receiving a 1&#xd7;K source word row vector &#x16b;; and generating a 1&#xd7;N codeword vector=&#x16b;&#xb7;G, wherein G is a K&#xd7;N generator matrix derived from a parity check matrix H; and wherein His derived from a base parity check matrix H by summing different rows in the base parity check matrix H to obtain an intermediate parity check matrix, and applying a lifting matrix to the intermediate base parity check matrix to obtain H.

High-rate long LDPC codes

Methods and apparatus for facilitating wireless communication using digital Quadrature Amplitude Modulation are disclosed. A wireless communication device utilizes a signal constellation for quadrature modulating a signal for transmission or quadrature demodulating a received signal. The signal constellation includes multiple constellation symbols and associated bit sequences, which can be translated there between. Specific signal constellations are disclosed.

Methods and apparatuses for quadrature amplitude modulation optimized for phase noise

A method for design an optimized constellation set and labeling for satellite point to multi-point transmission systems including transmitters and receivers, wherein the transmitters are adapted to create signals overlay and are configured to allow simultaneous transmission of at least two different data streams (services) intended for users with different radio link qualities. In particular, N services are provided to users having a good radio link and a subset of services is maintained and guaranteed for the users having a lower radio link quality condition.

Signal overlay design and detection for satellite communication channels

Methods and devices for encoding source words and decoding codewords wherein encoding a source word includes: receiving a 1&#xd7;K source word row vector &#x16b;; and generating a 1&#xd7;N codeword vector=&#x16b;&#xb7;G, wherein G is a K&#xd7;N generator matrix derived from a parity check matrix H; and wherein the parity check matrix His derived from a base parity check matrix H by applying an optimized lifting matrix to the base parity check matrix H.

Embodiments of the present invention disclose a frame transmission method for a wireless local area network and a wireless local area network apparatus, and relate to the field of communications technologies. According to the present invention, in a frame transmission process in a WLAN, a frame sent by a wireless local area network WLAN apparatus is received, and the frame of a particular standard is recognized by detecting a user common signal field included in the frame, so that backward compatibility of a WLAN apparatus is implemented, and hybrid networking of WLAN apparatuses of different standards can be supported, thereby improving flexibility of network deployment, and reducing complexity of networking.

Frame transmission method for wireless local area network and wireless local area network apparatus

Methods and devices are disclosed for encoding source words and decoding codewords with LDPC matrices. The Methods and devices use a LDPC matrix Hof lifting factor Z. The LDPC matrix Hcomprises a plurality of submatrices, each submatrix having a size of Z&#xd7;Z, and at least one submatrix has mdiagonals of '1' mis an integer&#x3e;=2.

Methods and systems for encoding and decoding for LDPC codes

Methods and apparatus for facilitating wireless communication using digital Quadrature Amplitude Modulation are disclosed. A mapping module electronic component of a wireless communication device utilizes a signal constellation for quadrature modulating a signal for transmission or quadrature demodulating a received signal. The signal constellation includes multiple constellation symbols and associated bit sequences. Specific signal constellations are disclosed. The signal constellations may be obtained through an optimization procedure which accounts for both phase noise and power amplifier nonlinearity.

Growing community of inventors

Turin, Italy

Guido Montorsi