Broadcast transmission with spatial spreading in a multi-antenna communication system
First Claim
1. A method of broadcasting data from a wireless multi-antenna transmitter, comprising:
- selecting at least two steering matrices for transmission of at least one block of data symbols obtained from at least one block of data, wherein the at least two steering matrices are provided to randomize an effective channel observed by each of a plurality of receiving entities for the at least one block of data symbols;
performing spatial processing on the at least one block of data symbols with each of the at least two steering matrices to obtain a plurality of sequences of transmit symbols, wherein the spatial processing comprises obtaining transmit symbols to be sent from a plurality of access point antennas in a transmission span by processing data symbols to be sent in the transmission span with a steering matrix selected for the transmission span; and
broadcasting one or more signals comprising the plurality of sequences of transmit symbols from a plurality of transmit antennas.
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Accused Products
Abstract
An access point in a multi-antenna system broadcasts data using spatial spreading to randomize an “effective” channel observed by each user terminal for each block of data symbols broadcast by the access point. At the access point, data is coded, interleaved, and modulated to obtain ND data symbol blocks to be broadcast in NM transmission spans, where ND≧1 and NM>1. The ND data symbol 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) 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 broadcast via NT transmit antennas and in one transmission span to user terminals within a broadcast coverage area.
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Citations
28 Claims
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1. A method of broadcasting data from a wireless multi-antenna transmitter, comprising:
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selecting at least two steering matrices for transmission of at least one block of data symbols obtained from at least one block of data, wherein the at least two steering matrices are provided to randomize an effective channel observed by each of a plurality of receiving entities for the at least one block of data symbols; performing spatial processing on the at least one block of data symbols with each of the at least two steering matrices to obtain a plurality of sequences of transmit symbols, wherein the spatial processing comprises obtaining transmit symbols to be sent from a plurality of access point antennas in a transmission span by processing data symbols to be sent in the transmission span with a steering matrix selected for the transmission span; and broadcasting one or more signals comprising the plurality of sequences of transmit symbols from a plurality of transmit antennas. - View Dependent Claims (2, 3, 4, 5, 6, 25)
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7. A wireless multi-antenna transmitter, comprising:
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a processor configured to perform spatial processing on the at least one block of data symbols, obtained from at least one block of data, with at least two steering matrices to obtain a plurality of sequences of transmit symbols each processed with a different one of the at least two steering matrices, wherein the plurality of steering matrices randomize an effective channel observed by each of a plurality of receiving entities for the at least one block of data symbols, wherein the spatial processing comprises obtaining transmit symbols to be sent from a plurality of access point antennas in a transmission span by processing data symbols to be sent in the transmission span with a steering matrix for the transmission span; and a plurality of transmitter units configured to broadcast the plurality of sequences of transmit symbols from a plurality of transmit antennas to the plurality of receiving entities in the system. - View Dependent Claims (8, 9, 10, 11, 12, 26)
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13. A wireless multi-antenna transmitter, comprising:
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means for selecting at least two steering matrices for transmission of the at least one block of data symbols obtained from at least one block of data, wherein the at least two steering matrices are provided to randomize an effective channel observed by each of a plurality of receiving entities for the at least one block of data symbols; means for performing spatial processing on the at least one block of data symbols with each of the at least two steering matrices to obtain a plurality of sequences of transmit symbols, wherein the spatial processing comprises obtaining transmit symbols to be sent from a plurality of access point antennas in a transmission span by processing data symbols to be sent in the transmission span with a steering matrix for the transmission span; and means for broadcasting the plurality of sequences of transmit symbols from a plurality of transmit antennas. - View Dependent Claims (14, 15, 16, 17, 18, 27)
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19. A memory unit including stored software codes that are utilized by one or more processors, the software codes comprising:
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code for selecting at least two steering matrices for transmission of the at least one block of data symbols obtained from at least one block of data, wherein the at least two steering matrices are provided to randomize an effective channel observed by each of a plurality of receiving entities for the at least one block of data symbols; code for performing spatial processing on the at least one block of data symbols with each of the at least two steering matrices to obtain a plurality of sequences of transmit symbols, wherein the spatial processing comprises obtaining transmit symbols to be sent from a plurality of access point antennas in a transmission span by processing data symbols to be sent in the transmission span with a steering matrix for the transmission span; and code for broadcasting one or more signals comprising the plurality of sequences of transmit symbols from a plurality of transmit antennas. - View Dependent Claims (20, 21, 22, 23, 24, 28)
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Specification