Diversity transmission modes for MIMO OFDM communication systems
First Claim
1. A method for processing data for transmission from a wireless communication apparatus, comprising:
- selecting a space-time diversity transmission mode from among a plurality of space-time diversity transmission modes that each use space time transmit diversity to transmit a first pair of transmission symbols using a first pair of antennas and a second pair of transmission symbols using a second pair of antennas, wherein the first pair of antennas are different from the second pair of antennas;
coding and modulating at least one data stream to provide first and second pairs of modulation symbols; and
processing the first pair of modulation symbols based on the selected space-time diversity transmission mode to provide the first pair of transmission symbols for transmission over the first pair of antennas and the second pair of modulation symbols based on the selected space-time diversity mode to provide the second pair of transmission symbols for transmission over the second pair of antennas.
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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
59 Claims
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1. A method for processing data for transmission from a wireless communication apparatus, comprising:
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selecting a space-time diversity transmission mode from among a plurality of space-time diversity transmission modes that each use space time transmit diversity to transmit a first pair of transmission symbols using a first pair of antennas and a second pair of transmission symbols using a second pair of antennas, wherein the first pair of antennas are different from the second pair of antennas; coding and modulating at least one data stream to provide first and second pairs of modulation symbols; and processing the first pair of modulation symbols based on the selected space-time diversity transmission mode to provide the first pair of transmission symbols for transmission over the first pair of antennas and the second pair of modulation symbols based on the selected space-time diversity mode to provide the second pair of transmission symbols for transmission over the second pair of antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus in a wireless communication system, comprising:
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a controller configured to select a space-time diversity transmission mode from among a plurality of space-time diversity transmission modes that each use space time transmit diversity to transmit a first pair of transmission symbols using a first pair of antennas and a second pair of transmission symbols using a second pair of antennas, wherein the first pair of antennas are different from the second pair of antennas; a processor configured to code and modulate at least one data stream to provide first and second pairs of modulation symbols; and another processor configured to process the first pair of modulation symbols based on the selected space-time diversity transmission mode to provide the first pair of transmission symbols for transmission over the first pair of antennas and the second pair of modulation symbols based on the selected space-time diversity mode to provide the second pair of transmission symbols for transmission over the second pair of antennas. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An apparatus comprising:
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means for selecting a space-time diversity transmission mode from among a plurality of space-time diversity transmission modes that each use space time transmit diversity to transmit a first pair of transmission symbols using a first pair of antennas and a second pair of transmission symbols using a second pair of antennas, wherein the first pair of antennas are different from the second pair of antennas; a processor configured to code and modulate at least one data stream to provide first and second pairs of modulation symbols; and means for processing the first pair of modulation symbols based on the selected space-time diversity transmission mode to provide the first pair of transmission symbols for transmission over the first pair of antennas and the second pair of modulation symbols based on the selected space-time diversity mode to provide the second pair of transmission symbols for transmission over the second pair of antennas. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method for processing data for transmission from a wireless communication apparatus, comprising:
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providing two pairs of modulation symbols; processing each pair of modulation symbols according to a space-time diversity transmission mode, selected from a plurality of space-time diversity transmission modes, to provide a first pair of transmission symbols from the two pairs of modulation symbols and a second pair of transmission symbols from the two pairs of modulation symbols; and providing the first pair of transmission symbols for transmission using a first pair of antennas and the second pair of transmission symbols for transmission using a second pair of antennas, wherein the first pair of antennas is different from the second pair of antennas. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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43. A wireless communication apparatus, comprising:
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a first processor configured to provide two pairs of modulation symbols; and a second processor configured to process each pair of modulation symbols according to a space-time diversity transmission mode, selected from a plurality of space-time diversity transmission modes, to provide a first pair of transmission symbols from the two pairs of modulation symbols and a second pair of transmission symbols from the two pairs of modulation symbols and to provide the first pair of transmission symbols for transmission using a first pair of antennas and the second pair of transmission symbols for transmission using a second pair of antennas, wherein the first pair of antennas are different from the second pair of antennas. - View Dependent Claims (44, 45, 46, 47, 48, 49)
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50. An apparatus for processing data for transmission from a wireless communication apparatus, comprising:
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means for providing two pairs of modulation symbols; means for utilizing a space-time diversity transmission mode, selected from a plurality of space-time diversity transmission modes, to provide a first pair of transmission symbols from the two pairs of modulation symbols and a second pair of transmission symbols from the two pairs of modulation symbols; and means for providing the first pair of transmission symbols for transmission using a first pair of antennas and the second pair of transmission symbols for transmission using a second pair of antennas, wherein the first pair of antennas is different from the second pair of antennas. - View Dependent Claims (51, 52, 53, 54)
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55. A computer-program product for processing data for transmission from a wireless communication apparatus comprising a memory having instructions stored thereon, the instructions being executable by one or more processors to perform a method:
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selecting a space-time diversity transmission mode from among a plurality of space-time diversity transmission modes that each use space time transmit diversity to transmit a first pair of transmission symbols using a first pair of antennas and a second pair of transmission symbols using a second pair of antennas, wherein the first pair of antennas are different from the second pair of antennas; coding and modulating at least one data stream to provide first and second pairs of modulation symbols; and processing the first pair of modulation symbols based on the selected space-time diversity transmission mode to provide the first pair of transmission symbols for transmission over the first pair of antennas and the second pair of modulation symbols based on the selected space-time diversity mode to provide the second pair of transmission symbols for transmission over the second pair of antennas. - View Dependent Claims (56, 57, 58, 59)
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Specification