Hierarchical coding with multiple antennas in a wireless communication system
First Claim
1. A method of transmitting a base stream of data and an enhancement stream of data in a wireless communication system, comprising:
- coding and modulating the base stream to obtain a first data symbol stream, wherein the base stream is designated to be received by a plurality of receiving entities;
coding and modulating the enhancement stream to obtain a second data symbol stream, wherein the enhancement stream is designated to be received by at least one receiving entity, and wherein the coding and modulating for the base and enhancement streams are not dependent on channel realizations of receiving entities for the base and enhancement streams;
processing the first data symbol stream in accordance with a first spatial processing scheme to obtain a first plurality of symbol substreams;
processing the second data symbol stream in accordance with a second spatial processing scheme to obtain a second plurality of symbol substreams, wherein the processing for the first and second data symbol streams is not dependent on the channel realizations of the receiving entities for the base and enhancement streams; and
combining the first plurality of symbol substreams with the second plurality of symbol substreams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas.
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Abstract
Techniques are provided for performing hierarchical coding in a multi-antenna communication system (e.g., a SIMO, MISO, or MIMO system). At a transmitter, a base stream and an enhancement stream are coded and modulated separately to obtain first and second data symbol streams, respectively. The first data symbol stream is processed in accordance with a first spatial processing scheme (e.g., a transmit diversity or a spatial multiplexing scheme) to obtain a first set of symbol substreams. The second data symbol stream is processed in accordance with a second spatial processing scheme (e.g., transmit diversity or spatial multiplexing) to obtain a second set of symbol substreams. The first set of symbol substreams is combined (e.g., using time division multiplexing or superposition) with the second set of symbol substreams to obtain multiple transmit symbol streams for transmission from multiple transmit antennas. A receiver performs complementary processing to recover the base stream and enhancement stream.
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Citations
42 Claims
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1. A method of transmitting a base stream of data and an enhancement stream of data in a wireless communication system, comprising:
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coding and modulating the base stream to obtain a first data symbol stream, wherein the base stream is designated to be received by a plurality of receiving entities;
coding and modulating the enhancement stream to obtain a second data symbol stream, wherein the enhancement stream is designated to be received by at least one receiving entity, and wherein the coding and modulating for the base and enhancement streams are not dependent on channel realizations of receiving entities for the base and enhancement streams;
processing the first data symbol stream in accordance with a first spatial processing scheme to obtain a first plurality of symbol substreams;
processing the second data symbol stream in accordance with a second spatial processing scheme to obtain a second plurality of symbol substreams, wherein the processing for the first and second data symbol streams is not dependent on the channel realizations of the receiving entities for the base and enhancement streams; and
combining the first plurality of symbol substreams with the second plurality of symbol substreams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of transmitting a base stream of data and an enhancement stream of data in a wireless communication system, comprising:
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coding and modulating the base stream to obtain a first data symbol stream, wherein the base stream is designated to be received by a plurality of receiving entities;
coding and modulating the enhancement stream to obtain a second data symbol stream, wherein the enhancement stream is designated to be received by at least one receiving entity;
processing the first data symbol stream in accordance with a transmit diversity scheme or a spatial multiplexing scheme to obtain a first plurality of symbol substreams;
processing the second data symbol stream in accordance with the transmit diversity scheme or the spatial multiplexing scheme to obtain a second plurality of symbol substreams; and
combining the first plurality of symbol substreams with the second plurality of symbol substreams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas. - View Dependent Claims (15, 16)
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17. An apparatus in a wireless communication system, comprising:
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means for coding and modulating a base stream of data to obtain a first data symbol stream;
means for coding and modulating an enhancement stream of data to obtain a second data symbol stream;
means for processing the first data symbol stream in accordance with a first spatial processing scheme to obtain a first plurality of symbol substreams;
means for processing the second data symbol stream in accordance with a second spatial processing scheme to obtain a second plurality of symbol substreams; and
means for combining the first plurality of symbol substreams with the second plurality of symbol substreams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas.
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18. An apparatus in a wireless communication system, comprising:
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a first data processor operative to code and modulate a base stream of data to obtain a first data symbol stream;
a second data processor operative to code and modulate an enhancement stream of data to obtain a second data symbol stream;
a first spatial processor operative to process the first data symbol stream in accordance with a first spatial processing scheme to obtain a first plurality of symbol substreams;
a second spatial processor operative to process the second data symbol stream in accordance with a second spatial processing scheme to obtain a second plurality of symbol substreams; and
a combiner operative to combine the first plurality of symbol substreams with the second plurality of symbol substreams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas. - View Dependent Claims (19, 20, 21)
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22. A method of transmitting at least two data streams in a wireless communication system, comprising:
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coding and modulating each of the at least two data streams to obtain a corresponding one of at least two data symbol streams;
spatially processing each of the at least two data symbol streams in accordance with a selected spatial processing scheme to obtain a set of symbol substreams for the data symbol stream, wherein at least two sets of symbol substreams are obtained for the at least two data symbol streams; and
combining the at least two sets of symbol substreams for the at least two data symbol streams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas, and wherein each of the at least two data streams is coded, modulated, and spatially processed for recovery by receiving entities achieving a different target signal-to-noise ratio (SNR) or better.
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23. A method of transmitting a base stream of data and an enhancement stream of data for a broadcast service in a wireless communication system, comprising:
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coding and modulating the base stream to obtain a first data symbol stream;
coding and modulating the enhancement stream to obtain a second data symbol stream;
processing the first data symbol stream in accordance with a first spatial processing scheme to obtain a first plurality of symbol substreams;
processing the second data symbol stream in accordance with a second spatial processing scheme to obtain a second plurality of symbol substreams; and
scaling the first plurality of symbol substreams with a first scaling factor to obtain a first plurality of scaled symbol substreams;
scaling the second plurality of symbol substreams with a second scaling factor to obtain a second plurality of scaled symbol substreams; and
summing the first plurality of scaled symbol substreams with the second plurality of scaled symbol substreams to obtain a plurality of transmit symbol streams for transmission from a plurality of transmit antennas. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A method of receiving a base stream of data and an enhancement stream of data in a wireless communication system, comprising:
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processing a plurality of received symbol streams, obtained via a plurality of receive antennas, in accordance with a first spatial processing scheme to provide a first recovered data symbol stream;
demodulating and decoding the first recovered data symbol stream to obtain a decoded base stream;
estimating interference due to the decoded base stream;
canceling the estimated interference due to the decoded base stream from the plurality of received symbol streams to obtain a plurality of modified symbol streams;
processing the plurality of modified symbol streams in accordance with a second spatial processing scheme to obtain a second recovered data symbol stream; and
demodulating and decoding the second recovered data symbol stream to obtain a decoded enhancement stream. - View Dependent Claims (32, 33, 34)
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35. An apparatus in a wireless communication system, comprising:
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means for processing a plurality of received symbol streams, obtained via a plurality of receive antennas, in accordance with a first spatial processing scheme to provide a first recovered data symbol stream for a base stream of data;
means for demodulating and decoding the first recovered data symbol stream to obtain a decoded base stream;
means for estimating interference due to the decoded base stream;
means for canceling the estimated interference due to the decoded base stream from the plurality of received symbol streams to obtain a plurality of modified symbol streams;
means for processing the plurality of modified symbol streams in accordance with a second spatial processing scheme to obtain a second recovered data symbol stream for an enhancement stream of data; and
means for demodulating and decoding the second recovered data symbol stream to obtain a decoded enhancement stream. - View Dependent Claims (36)
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37. An apparatus in a wireless communication system, comprising:
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a first spatial processor operative to process a plurality of received symbol streams, obtained via a plurality of receive antennas, in accordance with a first spatial processing scheme to provide a first recovered data symbol stream for a base stream of data;
a first data processor operative to demodulate and decode the first recovered data symbol stream to obtain a decoded base stream;
an interference canceller operative to estimate interference due to the decoded base stream and cancel the estimated interference due to the decoded base stream from the plurality of received symbol streams to obtain a plurality of modified symbol streams;
a second spatial processor operative to process the plurality of modified symbol streams in accordance with a second spatial processing scheme to obtain a second recovered data symbol stream for an enhancement stream of data; and
a second data processor operative to demodulate and decode the second recovered data symbol stream to obtain a decoded enhancement stream.
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38. A method of receiving a base stream of data and an enhancement stream of data in a wireless communication system, comprising:
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time division demultiplexing a plurality of received symbol streams, obtained via a plurality of receive antennas, to provide a first plurality of received symbol substreams for the base stream and a second plurality of received symbol substreams for the enhancement stream, wherein the base stream is designated to be received by a plurality of receiving entities and the enhancement stream is designated to be received by at least one receiving entity among the plurality of receiving entities;
processing the first plurality of received symbol substreams in accordance with a first spatial processing scheme to obtain a first recovered data symbol stream;
processing the second plurality of received symbol substreams in accordance with a second spatial processing scheme to obtain a second recovered data symbol stream;
demodulating and decoding the first recovered data symbol stream to obtain a decoded base stream; and
demodulating and decoding the second recovered data symbol stream to obtain a decoded enhancement stream. - View Dependent Claims (39, 40)
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41. An apparatus in a wireless communication system, comprising:
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means for time division demultiplexing a plurality of received symbol streams, obtained via a plurality of receive antennas, to provide a first plurality of received symbol substreams for a base stream of data and a second plurality of received symbol substreams for an enhancement stream of data;
means for processing the first plurality of received symbol substreams in accordance with a first spatial processing scheme to obtain a first recovered data symbol stream;
means for processing the second plurality of received symbol substreams in accordance with a second spatial processing scheme to obtain a second recovered data symbol stream;
means for demodulating and decoding the first recovered data symbol stream to obtain a decoded base stream; and
means for demodulating and decoding the second recovered data symbol stream to obtain a decoded enhancement stream.
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42. An apparatus in a wireless communication system, comprising:
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at least one demultiplexer operative to time division demultiplex a plurality of received symbol streams, obtained via a plurality of receive antennas, to provide a first plurality of received symbol substreams for a base stream of data and a second plurality of received symbol substreams for an enhancement stream of data;
a first spatial processor operative to process the first plurality of received symbol substreams in accordance with a first spatial processing scheme to obtain a first recovered data symbol stream;
a second spatial processor operative to process the second plurality of received symbol substreams in accordance with a second spatial processing scheme to obtain a second recovered data symbol stream;
a first data processor operative to demodulate and decode the first recovered data symbol stream to obtain a decoded base stream; and
a second data processor operative to demodulate and decode the second recovered data symbol stream to obtain a decoded enhancement stream.
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Specification