Abstract: This application provides a communication method and apparatus. According to the method, a first terminal apparatus can determine, based on second information, information that is in first demodulation information and second demodulation information and that is used to demodulate a first data stream, and determine information that is used to demodulate a second data stream. The first data stream is a common stream, and the second data stream is a private stream of the first terminal apparatus. The first terminal apparatus may first demodulate, based on the information that is used to demodulate the first data stream, a signal received by the first terminal apparatus on a first resource, to obtain the first data stream, and then may obtain the second data stream based on the first data stream, the information that is used to demodulate the second data stream, and the signal received on the first resource.

Abstract: A method is based on the user-specific frozen bit patterns of polar codes assigned to users. At the transmitter, the binary-valued user-specific frozen bit pattern sequences to be used in frozen bit locations are determined for each user, the information bits of each user are encoded using a polar encoder, and the binary-valued user-specific frozen bit patterns are used in frozen bit locations during encoding operation to improve the performance of the downlink multi-user MIMO system. Coded bits are mapped to symbols to be transmitted, and the symbols are mapped to the MIMO layers. Then, multi-antenna precoding is applied and baseband-to-RF processing is performed onto the precoded symbols to transmit the signal. The signal of all users is transmitted at the same time-frequency resources using transmit antennas. Each receiver receives the transmitted signal which is transmitted through respective downlink channels. Each user performs RF-to-baseband processing to their respective received signal.

Abstract: A method is based on the user-specific frozen bit patterns of polar codes assigned to users. At the transmitter, the binary-valued user-specific frozen bit pattern sequences to be used in frozen bit locations are determined for each user, the information bits of each user are encoded using a polar encoder, and the binary-valued user-specific frozen bit patterns are used in frozen bit locations during encoding operation to improve the performance of the downlink multi-user MIMO system. Coded bits are mapped to symbols to be transmitted, and the symbols are mapped to the MIMO layers. Then, multi-antenna precoding is applied and baseband-to-RF processing is performed onto the precoded symbols to transmit the signal. The signal of all users is transmitted at the same time-frequency resources using transmit antennas. Each receiver receives the transmitted signal which is transmitted through respective downlink channels. Each user performs RF-to-baseband processing to their respective received signal.

Abstract: A hardware complexity reduction method for successive cancellation list decoders (SCL) is provided. In path pruning stages of an SCL decoding, L paths with smallest path metrics out of 2L candidate paths are chosen as surviving candidate paths as in a conventional SCL algorithm. Moreover, path indexes of L surviving candidate paths are provided in a sorted manner according to indexes at an output of a sorter module. After a path pruning, instead of L-to-1 multiplexers, (L/2+1)-to-1 multiplexers are deployed to perform copying operations of any required elements stored in dedicated registers of the L surviving candidate paths.

Abstract: A method for improving performance of an uplink non-orthogonal multiple access system under imperfect received user power control. The method is based on a plurality of user-specific transmitter filters assigned to a plurality of users. At a transmitter of each user, a signal to be transmitted according to the uplink non-orthogonal multiple access (NOMA) method is filtered by a unique filter assigned to a corresponding user, and then a baseband-to-RF processing is performed onto a symbol sequence to generate a transmitted signal. Each user transmits their respective signal using a same time-frequency resource, and receiver receives a superimposed signal which is transmitted through a plurality of respective uplink channels under imperfect received power control. An RF-to-baseband conversion is applied onto a received superimposed signal.

Abstract: A hardware complexity reduction method for successive cancellation list decoders (SCL) is provided. In path pruning stages of an SCL decoding, L paths with smallest path metrics out of 2L candidate paths are chosen as surviving candidate paths as in a conventional SCL algorithm. Moreover, path indexes of L surviving candidate paths are provided in a sorted manner according to indexes at an output of a sorter module. After a path pruning, instead of L-to-1 multiplexers, (L/2+1)-to-1 multiplexers are deployed to perform copying operations of any required elements stored in dedicated registers of the L surviving candidate paths.

Abstract: A method for improving performance of an uplink non-orthogonal multiple access system under imperfect received user power control. The method is based on a plurality of user-specific transmitter filters assigned to a plurality of users. At a transmitter of each user, a signal to be transmitted according to the uplink non-orthogonal multiple access (NOMA) method is filtered by a unique filter assigned to a corresponding user, and then a baseband-to-RF processing is performed onto a symbol sequence to generate a transmitted signal. Each user transmits their respective signal using a same time-frequency resource, and receiver receives a superimposed signal which is transmitted through a plurality of respective uplink channels under imperfect received power control. An RF-to-baseband conversion is applied onto a received superimposed signal.