Spatial spreading in a multi-antenna communication system
First Claim
1. A method of receiving a data transmission in a wireless multiple-input multiple-output MIMO communication system, comprising:
- receiving, via a plurality of receive antennas, data symbols for at least two data symbol blocks, wherein for each of the at least two data symbol blocks, the data symbols are spatially processed with a plurality of steering matrices prior to transmission via a MIMO channel;
andspatially processing the received data, based on the plurality of steering matrices, to obtain data symbol estimates for the at least two data symbol blocks.
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Abstract
Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain ND data symbol blocks to be transmitted in NM transmission spans, where ND≥1 and NM>1. The ND blocks are partitioned into NM data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via NT transmit antennas in one transmission span. The ND data symbol blocks are thus spatially processed with NM steering matrices and observe an ensemble of channels.
253 Citations
20 Claims
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1. A method of receiving a data transmission in a wireless multiple-input multiple-output MIMO communication system, comprising:
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receiving, via a plurality of receive antennas, data symbols for at least two data symbol blocks, wherein for each of the at least two data symbol blocks, the data symbols are spatially processed with a plurality of steering matrices prior to transmission via a MIMO channel; and spatially processing the received data, based on the plurality of steering matrices, to obtain data symbol estimates for the at least two data symbol blocks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus in a wireless multiple-input multiple-output MIMO communication system, comprising:
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a plurality of receivers configured to receive data symbols for at least two data symbol blocks, wherein for each of the at least two data symbol blocks, the data symbols are spatially processed with a plurality of steering matrices prior to transmission via a MIMO channel; and a spatial processor configured to spatially process the received data symbols with the channel response estimate to obtain data symbol estimates for the at least two data symbol blocks. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification