BROADCAST TRANSMISSION WITH SPATIAL SPREADING IN A MULTI-ANTENNA COMMUNICATION SYSTEM
First Claim
1. A method of receiving a broadcast transmission in a wireless multi-antenna communication system, comprising:
- obtaining, via a plurality of receive antennas, received data symbols for at least one data symbol block spatially processed with a plurality of steering matrices prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
obtaining a channel estimate for an effective multiple-input multiple-output (MIMO) channel formed by the plurality of steering matrices and a MIMO channel between the plurality of transmit antennas and the plurality of receive antennas; and
performing receiver spatial processing on the received data symbols with the channel estimate to obtain data symbol estimates for the at least one data symbol block.
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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
32 Claims
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1. A method of receiving a broadcast transmission in a wireless multi-antenna communication system, comprising:
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obtaining, via a plurality of receive antennas, received data symbols for at least one data symbol block spatially processed with a plurality of steering matrices prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
obtaining a channel estimate for an effective multiple-input multiple-output (MIMO) channel formed by the plurality of steering matrices and a MIMO channel between the plurality of transmit antennas and the plurality of receive antennas; and
performing receiver spatial processing on the received data symbols with the channel estimate to obtain data symbol estimates for the at least one data symbol block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus in a wireless multi-antenna communication system, comprising:
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a plurality of receiver units to obtain, via a plurality of receive antennas, received data symbols for at least one data symbol block spatially processed with a plurality of steering matrices prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
a channel estimator to obtain a channel estimate for an effective multiple-input multiple-output (MIMO) channel formed by the plurality of steering matrices and a MIMO channel between the plurality of transmit antennas and the plurality of receive antennas; and
a spatial processor to perform receiver spatial processing on the received data symbols with the channel estimate to obtain data symbol estimates for the at least one data symbol block. - View Dependent Claims (13, 14, 15, 16)
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17. An apparatus in a wireless multi-antenna communication system, comprising:
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means for obtaining, via a plurality of receive antennas, received data symbols for at least one data symbol block spatially processed with a plurality of steering matrices prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
means for obtaining a channel estimate for an effective multiple-input multiple-output (MIMO) channel formed by the plurality of steering matrices and a MIMO channel between the plurality of transmit antennas and the plurality of receive antennas; and
means for performing receiver spatial processing on the received data symbols with the channel estimate to obtain data symbol estimates for the at least one data symbol block. - View Dependent Claims (18, 19, 20)
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21. A method of receiving a broadcast transmission in a wireless multi-antenna communication system, comprising:
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obtaining, via a single receive antenna, received data symbols for a data symbol block spatially processed with a plurality of steering vectors prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
obtaining a channel estimate for an effective multiple-input single-output (MISO) channel formed by the plurality of steering vectors and a MISO channel between the plurality of transmit antennas and the single receive antenna; and
performing detection on the received data symbols with the channel estimate to obtain data symbol estimates for the data symbol block. - View Dependent Claims (22, 23, 24, 25, 26)
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27. An apparatus in a wireless multi-antenna communication system, comprising:
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a receiver unit to obtain, via a single receive antenna, received data symbols for a data symbol block spatially processed with a plurality of steering vectors prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
a channel estimator to obtain a channel estimate for an effective multiple-input single-output (MISO) channel formed by the plurality of steering vectors and a MISO channel between the plurality of transmit antennas and the single receive antenna; and
a detector to perform detection on the received data symbols with the channel estimate to obtain data symbol estimates for the data symbol block. - View Dependent Claims (28, 29, 30)
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31. An apparatus in a wireless multi-antenna communication system, comprising:
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means for obtaining, via a single receive antenna, received data symbols for a data symbol block spatially processed with a plurality of steering vectors prior to broadcast from a plurality of transmit antennas to a plurality of receiving entities;
means for obtaining a channel estimate for an effective multiple-input single-output (MISO) channel formed by the plurality of steering vectors and a MISO channel between the plurality of transmit antennas and the single receive antenna; and
means for performing detection on the received data symbols with the channel estimate to obtain data symbol estimates for the data symbol block. - View Dependent Claims (32)
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Specification