QUANTIZATION OF CHANNEL STATE INFORMATION IN MULTIPLE ANTENNA SYSTEMS

摘要

A method of transmission over multiple wireless channels in a multiple antenna system includes storing channel modulation matrices at a transmitter; receiving quantized channel state information at the transmitter from plural receivers; selecting a transmission modulation matrix using the quantized channel state information from the stored channel modulation matrices; and transmitting over the multiple channels to the plural receivers using the selected transmission modulation matrix. In another embodiment, the method includes storing, at one or more receivers, indexes of modulation matrices generated by a capacity enhancing algorithm; upon a selected one of the one or more receivers receiving a transmission from the transmitter, the selected receiver selecting a modulation matrix from the stored modulation matrices that optimizes transmission between the transmitter and the selected receiver, the selected receiver sending an index representing the selected modulation matrix; and receiving the index at the transmitter from the selected receiver.

主权项

1. A method for wireless transmission from a multiple-antenna transmitter, the method comprising:
storing a codebook including pre-quantized channel vectors each having a length N, wherein N is a number of antennas at the transmitter; and in a multi-user multiple input and multiple output (MIMO) mode:
receiving a plurality of indices, one from each of a plurality of receivers, wherein each index corresponds to one of the pre-quantized channel vectors;determining up to N vectors based on up to N of the received indices and on pre-quantized channel vectors corresponding to the up to N received indices; andtransmitting data to up to N receivers of the plurality of receivers, using the determined vectors.