Patent ID: 7813313
Filing Date: 2010-10-12
Classification: H04B,H04W

Abstract:
1. A MIMO communication system based on random beamforming, including: a transmitter to transmit a data frame including at least a channel estimation signal and user data; and at least one receiver to receive the data frame from the transmitter and to produce corresponding feedback information and recover the user data; wherein the transmitter produces scheduling information according to the feedback information and utilizes the scheduling information to implement user scheduling, and the scheduling information includes scheduled users, data streams that should be supported by each scheduled user and a transmit beam adopted by each data stream; wherein the transmitter includes: a duplexer group and corresponding mounted transmitting antennas to transmit the data frame and to receive the feedback information from the receiver; a MIMO scheduler to produce scheduling information according to the feedback information; and a MIMO data processor to select the user for scheduling according to the scheduling information and to transmit the data of the selected user by the selected transmit beam, and the receiver includes: a duplexer group and the corresponding mounted receiving antennas to receive the data frame from the transmitter and to transmit the feedback signal of the user; a received signal processor to produce the feedback data of the user and to recover the user data according to the data frame; and a feedback information processor to transform the feedback information of the user into the feedback signal; wherein the MIMO data processor includes: a user selector to select the user for scheduling according to the scheduling information; a plurality of parallel de-multiplexers to divide the user data of the scheduled user and to output a plurality of symbol streams; a beam allocator to process the symbol streams outputted from the de-multiplexer and to establish the association between each symbol stream and the corresponding transmit beam; a random matrix generator to generate and output the random matrix; a beamformer to generate a plurality of transmission signals according to the symbol streams that have already established the association with the corresponding transmit beams and according to the random matrix from the random matrix generator; and a transmitting RF link group to receive a plurality of transmission signals from the beamformer and to transform the plurality of signals into the corresponding RF signals.