Marvell International Limited

Marvellworld Trade Ltd.

Nxp USA, Inc.

Marvell Asia Pte., Ltd.

Jie Huang

Hongyuan Zhang

Rui Cao

Mingguang Xu

Sudhir Srinivasa

Xiayu Zheng

Yakun Sun

Leilei Song

Hui-Ling Lou

A system includes a modulator, a repetition module, and a phase rotation module. The modulator is configured to (i) modulate data using a first modulation scheme and dual sub-carrier modulation, and (ii) generate modulated symbols for transmission on a plurality of subcarriers. The dual sub-carrier modulation modulates the same information on a pair of subcarriers. The repetition module is configured to repeat the modulated symbols from a first half of the plurality of subcarriers to a second half of the plurality of subcarriers. The phase rotation module is configured to rotate phase of the modulated symbols on selected subcarriers of the second half of the plurality of subcarriers. The selected subcarriers of the second half of the plurality of subcarriers include at least one half of the second half of the plurality of subcarriers.

Systems and methods to reduce peak to average power ratio for dual sub-carrier modulated transmissions in a wireless network

A physical layer (PHY) preamble of a PHY data unit is generated, including generating one or more short orthogonal frequency division multiplexing (OFDM) symbols for one or more long training fields of the PHY preamble. Each of the one or more short OFDM symbols corresponds to a frequency domain sequence having a number of tones. Every N-th tone is modulated and tones between modulated tones are zero tones, where N is a positive integer greater than one. A time duration of each short OFDM symbol is 1/N of a time duration of a full inverse discrete Fourier transform (IDFT) of the frequency domain sequence. A data portion of the PHY data unit is generated, including generating one or more long OFDM symbols. A time duration of each long OFDM symbol is greater than a time duration of each of the one or more short OFDM symbols.

Compressed preamble for a wireless communication system

A boundary within a last orthogonal frequency division multiplexing (OFDM) symbol of a PHY data unit is determined. Pre-encoder padding bits are added to a set of information bits to generate a set of padded information bits such that the set of padded information bits, after being encoded, fill one or more OFDM symbols up to the boundary within the last OFDM symbol. The set of padded information bits are encoded to generate a set of coded bits. A PHY preamble is generated to include a subfield that indicates the boundary. The one or more OFDM symbols are generated to include (i) the set of coded information bits in the one or more OFDM symbols up to the boundary to allow a receiving device to stop decoding the one or more OFDM symbols at the boundary, and (ii) post-encoder padding bits in the last OFDM symbol following the boundary.

Padding for orthogonal frequency division multiplexing (OFDM) symbols in a wireless communication system

A system includes a modulator to modulate data using Quadrature Phase Shift Keying modulation and dual sub-carrier modulation to generate modulated symbols for transmission on a plurality of subcarriers. A repetition module repeats the modulated symbols from a first half of the plurality of subcarriers to a second half of the plurality of subcarriers. A phase rotation module rotates phase of the modulated symbols on selected subcarriers of the second half of the plurality of subcarriers. The selected subcarriers include all of the second half of the plurality of subcarriers. The phase rotation module rotates the phase of the modulated symbols on all of the second half of the plurality of subcarriers to conjugate the modulated symbols on all of the second half of the plurality of subcarriers relative to corresponding modulated symbols on all of the first half of the plurality of subcarriers.

A system includes a code rate selecting module and a matrix generating module. The code rate selecting module is configured to select a code rate of k/n to encode k units of data into n units of data using a low-density parity-check (LDPC) code, where k and n are integers greater than 1, and k&#x3c;n. The matrix generating module is configured to generate a matrix with (R+S) rows and (C+S) columns, where R and C are integers greater than 1, R=C/n, and S is an integer greater than or equal to zero and denotes a number of columns of the matrix deleted after encoding the k units of data using the LDPC code.

Low-density parity-check codes for WiFi networks

A system including a modulator, a repetition module, and a phase rotation module. The modulator is configured to (i) modulate data using dual sub-carrier modulation, and (ii) generate modulated symbols for transmission on a plurality of subcarriers. The repetition module is configured to repeat the modulated symbols from a first half of the plurality of subcarriers to a second half of the plurality of subcarriers. The phase rotation module is configured to rotate phase of the modulated symbols on selected subcarriers of the second half of the plurality of subcarriers.

One or more long OFDM symbols for a data portion of a data unit data are generated. Each of the one or more long OFDM symbols is generated with a first number of OFDM tones. One or more short OFDM symbols for one or more long training fields of a preamble of the data unit are generated. Each of the one or more short OFDM symbols is generated with a second number of OFDM that is a fraction 1/N of the first number of OFDM tones, wherein N is a positive integer greater than one. The data unit is generated. Generating the data unit includes generating the preamble to include the one or more short OFDM symbols corresponding to the one or more training fields of the preamble and generating the data portion to include the one or more long OFDM symbols.

One or more first padding bits are added to information bits to be included in a data portion of a data unit such that the information bits, after being encoded, fill one or more OFDM symbols up to a boundary within a last OFDM symbol. The information bits and the first padding bits are encoded to generate coded bits. After encoding, coded bits corresponding to the last OFDM symbol are padded, or constellation points generated based on the coded bits corresponding to the last OFDM symbol are padded, such that the padded coded bits or the padded constellation points occupy a remaining portion of the last OFDM symbol after the boundary. The last OFDM symbol of the data portion is generated to include the coded information bits corresponding to the last OFDM symbol, the first padding bits and second padding bits or padding constellation points added after encoding.

Compressed orthogonal frequency division multiplexing (OFDM) symbols in a wireless communication system

A data symbol vector comprising a plurality of data symbols is received. The data symbol vector corresponds to a transmitted data symbol vector comprising a corresponding plurality of transmitted data symbols. Data values are estimated for transmitted data symbols in a first group of transmitted data symbols using a hard-decision technique. One or more iterations of refining estimated data values for at least one of the transmitted data symbols in the first group are performed based on estimated data values for the other one or more transmitted data symbols in the first group. Likelihood values for bits corresponding to transmitted data symbols in a second group of transmitted data symbols are calculated using a soft maximum-likelihood (ML) technique based on the estimated and refined data values of transmitted data symbols in the first group.

Multi-stream demodulation schemes with progressive optimization

A network device including a matrix generating module, an encoding module and a transceiver. The matrix generating module is configured to generate or access a code base matrix, wherein the code base matrix has a corresponding code rate of 7/8. The matrix generating module is also configured to, based on the code base matrix, generate a resultant matrix of a low-density parity-check code. The resultant matrix includes sub-matrices. Each of the sub-matrices is generated based on a respective element in the code base matrix. The resultant matrix has a code length of 648 or 1296. The encoding module is configured to encode data based on the resultant matrix. The transceiver is configured to transmit the encoded data.

Network devices and methods of generating low-density parity-check codes and performing corresponding encoding of data

In various embodiments, the present disclosure provides transmitters, receivers, and methods of determining channel state information for a maximum likelihood (ML) multiple input multiple output (MIMO) receiver, as well as transmitting and demodulating signals based on the determined channel state information. A ML MIMO receiver receives a first MIMO signal from a MIMO transmitter. Channel characteristics of the first MIMO signal are determined based on decision feedback equalization (DFE) processing. The DFE-determined channel characteristics, or information derived from the DFE-determined channel characteristics, are reported to the MIMO transmitter and the MIMO ML receiver decodes a second MIMO signal based on ML processing. The second MIMO signal is modulated and encoded by the MIMO transmitter according to a modulation and coding scheme in accordance with (1) the DFE-determined channel characteristics or (2) the information derived from the DFE-determined channel characteristics.

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San Jose, CA, United States of America

Jie Huang