Diversity transmission modes for MIMO OFDM communication systems
First Claim
1. A method for processing data for transmission in a wireless communication system, comprising:
- selecting a particular diversity transmission mode from among a plurality of possible transmission modes to use for each of one or more data streams, wherein each selected diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof;
coding and modulating each data stream based on coding and modulation schemes selected for the data stream to provide modulation symbols; and
processing the modulation symbols for each data stream based on the selected diversity transmission mode to provide transmit symbols for transmission over one or more transmit antennas.
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Accused Products
Abstract
Techniques for transmitting data using a number of diversity transmission modes to improve reliability. At a transmitter, for each of one or more data streams, a particular diversity transmission mode is selected for use from among a number of possible transmission modes. These transmission modes may include a frequency diversity transmission mode, a Walsh diversity transmission mode, a space time transmit diversity (STTD) transmission mode, and a Walsh-STTD transmission mode. Each diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof. Each data stream is coded and modulated to provide modulation symbols, which are further processed based on the selected diversity transmission mode to provide transmit symbols. For OFDM, the transmit symbols for all data streams are further OFDM modulated to provide a stream of transmission symbols for each transmit antenna used for data transmission.
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Citations
49 Claims
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1. A method for processing data for transmission in a wireless communication system, comprising:
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selecting a particular diversity transmission mode from among a plurality of possible transmission modes to use for each of one or more data streams, wherein each selected diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof;
coding and modulating each data stream based on coding and modulation schemes selected for the data stream to provide modulation symbols; and
processing the modulation symbols for each data stream based on the selected diversity transmission mode to provide transmit symbols for transmission over one or more transmit antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for processing data for transmission in a multiple-input multiple-output (MIMO) communication system that utilizes orthogonal frequency division multiplexing (OFDM), comprising:
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selecting a particular diversity transmission mode from among a plurality of possible transmission modes to use for each of one or more data streams, wherein each selected diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof by using frequency diversity, Walsh transmit diversity, space time transmit diversity (STTD), or any combination thereof;
coding and modulating each data stream based on coding and modulation schemes selected for the data stream to provide modulation symbols; and
processing the modulation symbols for each data stream based on the selected diversity transmission mode to provide transmit symbols for transmission over a plurality of transmit antennas. - View Dependent Claims (22, 23)
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24. A method for processing data for transmission in a multiple-input multiple-output (MIMO) communication system that utilizes orthogonal frequency division multiplexing (OFDM), comprising:
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coding and modulating data to provide one or more substreams of modulation symbols for each of a plurality of OFDM subbands; and
for each of the plurality of OFDM subbands, processing the modulation symbols in the one or more substreams for the OFDM subband to provide transmit symbols, wherein the modulation symbols are processed in accordance with a particular diversity processing scheme selected for the OFDM subband to provide diversity in time, frequency, space, or a combination thereof. - View Dependent Claims (25, 26, 27)
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28. A method for processing a data transmission at a receiver of a wireless communication system, comprising:
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determining a particular diversity transmission mode used for each of one or more data streams to be recovered from a received data transmission, wherein the diversity transmission mode used for each data stream is selected from among a plurality of possible transmission modes, and wherein each diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof; and
processing received symbols for each data stream based on the diversity transmission mode used for the data stream to provide recovered symbols that are estimates of modulation symbols transmitted from a transmitter for the data stream. - View Dependent Claims (29, 30, 31, 32)
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33. A memory communicatively coupled to a digital signal processing device (DSPD) capable of interpreting digital information to:
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select a particular diversity transmission mode from among a plurality of possible transmission modes to use for each of one or more data streams, wherein each selected diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof;
code and modulate each data stream based on coding and modulation schemes selected for the data stream to provide modulation symbols; and
process the modulation symbols for each data stream based on the selected diversity transmission mode to provide transmit symbols for transmission over one or more transmit antennas.
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34. A transmitter unit in a wireless communication system, comprising:
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a controller operative to select a particular diversity transmission mode from among a plurality of possible transmission modes to use for each of one or more data streams, wherein each selected diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof;
a TX data processor operative to code and modulate each data stream based on coding and modulation schemes selected for the data stream to provide modulation symbols; and
a transmit processor operative to process the modulation symbols for each data stream based on the selected diversity transmission mode to provide transmit symbols for transmission over one or more transmit antennas. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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42. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for selecting a particular diversity transmission mode from among a plurality of possible transmission modes to use for each of one or more data streams, wherein each selected diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof;
means for coding and modulating each data stream based on coding and modulation schemes selected for the data stream to provide modulation symbols; and
means for processing the modulation symbols for each data stream based on the selected diversity transmission mode to provide transmit symbols for transmission over one or more transmit antennas. - View Dependent Claims (43)
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44. A receiver unit in a wireless communication system, comprising:
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a controller operative to determine a particular diversity transmission mode used for each of one or more data streams to be recovered from a received data transmission, wherein the diversity transmission mode used for each data stream is selected from among a plurality of possible transmission modes, and wherein each diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof; and
a receive processor operative to process received symbols for each data stream based on the diversity transmission mode used for the data stream to provide recovered symbols that are estimates of modulation symbols transmitted from a transmitter for the data stream. - View Dependent Claims (45, 46, 47, 48)
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49. A receiver apparatus in a wireless communication system, comprising:
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means for determining a particular diversity transmission mode used for each of one or more data streams to be recovered from a received data transmission, wherein the diversity transmission mode used for each data stream is selected from among a plurality of possible transmission modes, and wherein each diversity transmission mode redundantly transmits data over time, frequency, space, or a combination thereof; and
means for processing received symbols for each data stream based on the diversity transmission mode used for the data stream to provide recovered symbols that are estimates of modulation symbols transmitted from a transmitter for the data stream.
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Specification