Panasonic Corporation

Panasonic Intellectual Property Corporation of America

Sun Patent Trust

Qian Yu

Masayuki Hoshino

Daichi Imamura

Lei Huang

Ping Luo

Kenichi Miyoshi

Hiramatsu Katsuhiko

In a MIMO system using a cross-polarized antenna structure, even if no ideal XPD can be obtained, the interference between different polarized waves can be reduced to allow an effective precoding to be executed. When a MIMO communication is performed between a transmitter and a receiver each using a cross-polarized antenna structure, a channel estimating and precoding selection section of the receiver performs a channel estimation of MIMO channels from the transmitter to the receiver, decides a precoding matrix of a projection matrix for mutually orthogonalizing or substantially orthogonalizing the channel response matrixes for respective different polarized waves, and feeds the determined precoding matrix back to the transmitter. In the transmitter, a precoding processing section applies the precoding matrix to the spatial stream corresponding to one of the polarized waves to perform a precoding, thereby allowing the transmitter to transmit the polarized waves with the orthogonality therebetween maintained.

Wireless communication apparatus, wireless communication system and wireless communication method

Interference between users in an MU-MIMO system is minimized by effective precoding, without increasing an overhead of control data. In a wireless communication system in which multiplex communication is possible between multiple UE, UE, and BS, a channel estimation and precoding selection unitin BS estimates channels from the respective UE, UEto the BS, determines a precoding matrix P from a projection matrix to make the two channel response matrices orthogonal or nearly orthogonal, and feeds back the precoding matrix P to UE, and executes precoding on only UEof the two. A precoding unitin the UEemploys the precoding matrix P that has been notified to perform precoding of a data stream, and sends the precoded data stream to the BS.

Wireless communication apparatus, wireless communication system, and wireless communication method

In a MIMO system using a cross-polarized antenna structure, even if no ideal XPD can be obtained, the interference between different polarized waves can be reduced to allow an effective precoding to be executed. When a MIMO communication is performed between a transmitter () and a receiver () each using a cross-polarized antenna structure, a channel estimating and precoding selection section () of the receiver () performs a channel estimation of MIMO channels from the transmitter to the receiver, decides a precoding matrix (P) of a projection matrix for mutually orthogonalizing or substantially orthogonalizing the channel response matrixes for respective different polarized waves, and feeds the determined precoding matrix (P) back to the transmitter (). In the transmitter (), a precoding processing section () applies the precoding matrix (P) to the spatial stream corresponding to one of the polarized waves to perform a precoding, thereby allowing the transmitter () to transmit the polarized waves with the orthogonality therebetween maintained.

A method for data transmission in a multiple input multiple output (MIMO) system, the method including, receiving multiple input data streams; performing low density parity check (LDPC) encoding of the input data streams utilizing a parity check matrix, the parity check matrix including a plurality of sub-parity check matrices for encoding respective ones of the input data streams; and performing space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas.

Method and system for data transmission in a multiple input multiple output (MIMO) system including unbalanced lifting of a parity check matrix prior to encoding input data streams

A transmission method in a multiple-input multiple-output (MIMO) communication system, a transmitter in a MIMO communication system and a MIMO communication system are provided. The method comprises the steps of: receiving feedback data representing channel state information from respective receivers of the MIMO communication system; grouping the receivers into one or more groups based on the received feedback data; obtaining a precoding matrix for each group of receivers based on the received feedback data such that precoding vectors or sub-matrices in the precoding matrix associated with respective receivers of said each group of receivers are orthogonal to each other; and applying the precoding matrix to input signals for transmission to said each group of receivers.

Method and system for communication channel optimization in a multiple-input multiple-output (MIMO) communication system

A method and system for transmitting data in a wireless communications system using multiple transmit antennas. The method comprises the steps of receiving a plurality of data sequences, each assigned with a priority level; encoding each of said plurality of data sequences in accordance with the assigned priority level to form a plurality of coded data sequences, the coded data sequences comprising systematic data and parity data; interleaving said plurality of coded data sequences to form a plurality of interleaved data sequences; multiplexing said plurality of interleaved data sequences to form a plurality of multiplexed data sequences; and mapping said plurality of multiplexed data sequences to form a plurality of mapped data sequences for subsequent transmission of said mapped data sequences from said multiple transmit antennas.

Transmission of multicast/broadcast services in a wireless communication network

A method for data transmission in a multiple input multiple output (MIMO) system. The method for data transmission includes receiving multiple input data streams and performing low density parity check (LDPC) encoding of the input data streams utilizing a parity check matrix. The parity check matrix comprises a plurality of sub-parity check matrices for encoding respective associated ones of the input data streams and performing space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas. The performing of the LDPC encoding of the input data streams includes generating one or more connection matrices, each connection matrix for injecting information of one of the input data streams into the encoding of another one of the input data streams. Each connection matrix is a zero matrix if a lowest parity check protection level based on the sub-parity check matrix for the one of the input data streams is equal to or lower than an assigned parity check protection level for the one input data stream, and a non zero matrix otherwise.

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Qian Yu