Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
First Claim
1. A method of transmitting data with a transmitting entity in a wireless multi-antenna communication system utilizing orthogonal frequency division multiplexing (OFDM), the method comprising:
- processing a data packet to obtain a block of data symbols at the transmitting entity;
demultiplexing pilot symbols and the block of data symbols using OFDM onto a plurality of subbands to obtain, for the data packet, a plurality of sequences of pilot and data symbols for the plurality of subbands; and
performing spatial processing, at the transmitting entity, on at least one of the pilot and data symbols for each subband with at least one steering vector selected for the subband, the spatial processing randomizing a plurality of effective single-input single-output (SISO) channels observed across the plurality of subbands.
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Accused Products
Abstract
A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. The PRTS mode may be used to achieve transmit diversity or spatial spreading. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across a packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission.
153 Citations
34 Claims
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1. A method of transmitting data with a transmitting entity in a wireless multi-antenna communication system utilizing orthogonal frequency division multiplexing (OFDM), the method comprising:
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processing a data packet to obtain a block of data symbols at the transmitting entity; demultiplexing pilot symbols and the block of data symbols using OFDM onto a plurality of subbands to obtain, for the data packet, a plurality of sequences of pilot and data symbols for the plurality of subbands; and performing spatial processing, at the transmitting entity, on at least one of the pilot and data symbols for each subband with at least one steering vector selected for the subband, the spatial processing randomizing a plurality of effective single-input single-output (SISO) channels observed across the plurality of subbands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus in a wireless multi-antenna communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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a data processor operative to process a data packet to obtain a block of data symbols; a demultiplexer operative to demultiplex pilot symbols and the block of data symbols using OFDM onto a plurality of subbands to obtain, for the data packet a plurality of sequences of pilot and data symbols for the plurality of subbands; and a spatial processor operative to perform spatial processing on at least one of the pilot and data symbols for each subband with at least one steering vector selected for the subband, the spatial processing randomizing a plurality of effective single-input single-output (SISO) channels observed across the plurality of subbands. - View Dependent Claims (18, 19, 20, 21, 22, 23, 25)
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24. An apparatus in a wireless multi-antenna communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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means for processing a data packet to obtain a block of data symbols; a demultiplexer means for demultiplexing pilot symbols and the block of data symbols using OFDM onto a plurality of subbands to obtain, for the data packet, a plurality of sequences of pilot and data symbols for the plurality of subbands; and a processor means for performing spatial processing on at least one of the pilot and data symbols for each subband with at least one steering vector selected for the subband, the spatial processing randomizing a plurality of effective single-input single-output (SISO) channels observed across the plurality of subbands. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A memory unit for processing data for transmission from transmitting data from a transmitting entity to a receiving entity in a wireless multi-antenna communication system utilizing orthogonal frequency division multiplexing (OFDM) comprising a memory, the memory having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
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instructions for processing a data packet to obtain a block of data symbols; instructions for demultiplexing pilot symbols and the block of data symbols using OFDM onto a plurality of subbands to obtain, for the data packet, a plurality of sequences of pilot and data symbols for the plurality of subbands; and instructions for performing spatial processing on at least one of the pilot and data symbols for each subband with at least one steering vector selected for the subband, the spatial processing randomizing a plurality of effective single-input single-output (SISO) channels observed across the plurality of subbands. - View Dependent Claims (33, 34)
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Specification