Receiving apparatus, transmitting apparatus and wireless communication system using them

摘要

When spatial multiplexing is performed to any of a plurality of receiving antennas included in each terminal, it becomes possible to obtain excellent receiving characteristics by combining signals received by all antennas appropriately. A receiving antenna unit 28 receives channel state information from each terminal, a channel matrix H is obtained. A transmit weight/interference coefficient calculation unit 24 calculates a transmit weight and an interference coefficient based on channel matrix. The transmit weight is input to transmit weight multiplication units 17 and 23. The interference generation unit 15 generates an interference signal based on the interference coefficient. An interference subtraction unit 13 subtracts the interference signal from a desired signal. A modulo unit 14 adds a signal so that amplitude of an information signal output from the interference subtraction unit 13 falls within a constant range. A signal multiplexing unit 18 performs spatial multiplexing to the signal performed nonlinear arithmetic.

主权项

1. A receiving apparatus which has N pieces of receiving antennas where N is an integer of 2 or more and which receives a signal transmitted from a transmitting apparatus which has a plurality of transmitting antennas and performs spatial multiplexing with nonlinear precoding using nonlinear arithmetic, wherein,
a signal which is generated by sequentially subtracting interference from a desired signal based on channel state information between the transmitting apparatus and the plurality of receiving apparatuses and which subjected to spatial multiplexing with the non-linear precoding using a modulo-arithmetic operation, is received by the N pieces of the receiving antennas, a receiving weight is calculated based on a term representing a coefficient of the interference subtracted sequentially from the desired signal, the received signal is multiplied by the receiving weight to be combined, and the modulo-arithmetic operation is performed to the combined signal so that a desired signal is detected, wherein the receiving weight has a term of I-F where I is a unit matrix and F shows a coefficient matrix.