TRANSMITTER DIVERSITY TECHNIQUE FOR WIRELESS COMMUNICATIONS
First Claim
1. An electronic circuit capable of receiving a wireless communication from first and second space diverse antennas, the wireless communication being further one of time diverse or frequency diverse, the electronic circuit comprising:
- a channel estimator for estimating characteristics of a transmit channel received from at least one of said space diverse antennas and outputting said estimated channel characteristics to a signal combiner and to a detector, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
said signal combiner for combining signals received from said first and second space diverse antennas and outputting said combined signals to said detector as two output data signals responsive to said estimated transmit channel characteristics; and
said detector for detecting respective transmitted signals in the presence of noise responsive to said estimated channel characteristics and in accordance with a decision rule.
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Abstract
A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only of simple arithmetic operations, such as negation and conjugation. The diversity created by the 5 transmitter utilizes space diversity and either time or frequency diversity. Space diversity is effected by redundantly transmitting over a plurality of antennas, time diversity is effected by redundantly transmitting at different times, and frequency diversity is effected by redundantly transmitting at different frequencies: Illustratively, using two transmit antennas and a single receive antenna, one of the disclosed embodiments provides the to same diversity gain as the maximal-ratio receiver combining (MRRC) scheme with one transmit antenna and two receive antennas. The principles of this invention are applicable to arrangements with more than two antennas, and an illustrative embodiment is disclosed using the same space block code with two transmit and two receive antennas.
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Citations
28 Claims
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1. An electronic circuit capable of receiving a wireless communication from first and second space diverse antennas, the wireless communication being further one of time diverse or frequency diverse, the electronic circuit comprising:
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a channel estimator for estimating characteristics of a transmit channel received from at least one of said space diverse antennas and outputting said estimated channel characteristics to a signal combiner and to a detector, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
said signal combiner for combining signals received from said first and second space diverse antennas and outputting said combined signals to said detector as two output data signals responsive to said estimated transmit channel characteristics; and
said detector for detecting respective transmitted signals in the presence of noise responsive to said estimated channel characteristics and in accordance with a decision rule. - View Dependent Claims (2, 3, 4)
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5. A method of receiving a wireless communication from first and second space diverse antennas, the wireless communication being further one of time diverse or frequency diverse, the method comprising:
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estimating characteristics of a transmit channel received from one of said space diverse antennas and outputting said estimated characteristics to a signal combiner and a detector using a decision rule, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
combining signals received from said first and second space diverse antennas and outputting said combined signals to said detector as two output data signals responsive to said estimated channel characteristics;
and detecting respective transmitted signals in the presence of noise via said detector using said decision rule and being responsive to said estimated channel characteristics. - View Dependent Claims (6, 7)
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8. An electronic circuit for decoding wireless communication signals, comprising:
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a combiner adapted to receive one of an incoming time diverse or frequency diverse signal representing blocks of encoded symbols, wherein the blocks of symbols have been transmitted by a plurality of spatially diverse antennae, wherein the combiner is configured to combine the received encoded symbols, and wherein the received encoded symbols include negating selected symbols and conjugating selected symbols; and
a detector configured to recover one of a time diverse or a frequency diverse signal responsive to said combiner, the detector receiving the combined encoded signals and recovering a transmitted signal for feedback to said combiner. - View Dependent Claims (9, 10)
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11. An electronic circuit for decoding wireless communication signals, comprising:
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a combiner adapted to receive one of an incoming time diverse or frequency diverse signal representing blocks of encoded symbols, wherein the blocks of symbols have been transmitted by a plurality of spatially diverse antennas, wherein the combiner is configured to combine the received encoded symbols and to output first and second signals, and wherein the received encoded symbols include negating selected symbols and conjugating selected symbols; and
a detector configured to recover one of a time diverse or a frequency diverse signal responsive to said combiner, the detector receiving the first and second output signals of said combiner and recovering a transmitted signal using one of a metric or decision rule. - View Dependent Claims (12, 13, 14)
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15. A method for decoding wireless data communication signals, the method comprising:
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combining first and second received space diverse transmit data channels to receive one of an incoming time diverse or frequency diverse signal representing blocks of encoded symbols, wherein the blocks of encoded symbols have been transmitted by a plurality of spatially diverse antennas and wherein the received encoded symbols include negating selected symbols and conjugating selected symbols; and
detecting the combined encoded signals and recovering a transmitted signal using one of a metric or a decision rule to recover decoded blocks of symbols. - View Dependent Claims (16, 17, 18, 19)
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20. An electronic circuit for receiving wireless communications of unequal power from first and second space diverse antennas, the wireless communication being further one of time diverse or frequency diverse, the electronic circuit comprising:
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a channel estimator for estimating characteristics of at least one transmit channel received from said space diverse antennas and outputting said estimated characteristics to a signal combiner and a detector, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
said signal combiner for combining signals received from said first and second space diverse antennas and outputting said combined signals to said detector as two output data signals responsive to said estimated channel characteristics; and
said detector for detecting respective transmitted signals in the presence of noise responsive to said estimated channel characteristics, said detector for feeding back the detected transmitted signals to said channel estimator. - View Dependent Claims (21)
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22. A method of receiving a wireless communication from first and second space diverse antennas, the wireless communication comprising symbols of unequal power, the wireless communication being transmitted over first and second sequential time intervals, the method comprising:
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combining signals received from said first and second space diverse antennas and outputting said combined signals to a detector as two output data signals;
estimating characteristics of a detected transmit channel and outputting said estimated characteristics to a signal combiner and to said detector, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
detecting respective transmitted signals in the presence of noise via said detector responsive to said estimated channel characteristics to recover the transmitted signals; and
feeding back the recovered transmitted signals for updating channel estimates. - View Dependent Claims (23, 24)
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25. An electronic circuit for receiving a wireless communication transmitted from first and second space diverse antennas, the wireless communication being further one of time diverse or frequency diverse, the electronic circuit comprising:
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first and second channel estimators for receiving said wireless communication via first and second space diverse receive antennae respectively and for estimating characteristics of a transmit channel received from said space diverse antennas and outputting said estimated characteristics to a signal combiner and a detector, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
a signal combiner for combining signals received from said first and second space diverse antennas and outputting said combined signals to said detector as two output data signals responsive to said estimated channel characteristics; and
said detector for recovering respective transmitted signals in the presence of noise responsive to said estimated channel characteristics and said two output data signals received from said signal combiner. - View Dependent Claims (26)
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27. A method of receiving a wireless communication transmitted from first and second space diverse antennas, the wireless communication being further one of time diverse or frequency diverse, the electronic circuit comprising:
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receiving said wireless communication via first and second space diverse receive antennae at first and second channel estimators respectively;
estimating characteristics of a transmit channel received from said space diverse antennas and outputting said estimated characteristics to a signal combiner and a detector, the characteristics being related to a time difference between sequential transmissions from said space diverse antennas;
combining signals received from said first and second space diverse antennas and outputting said combined signals to said detector as two output data signals responsive to said estimated channel characteristics; and
recovering respective transmitted signals at said detector in the presence of noise responsive to said estimated channel characteristics and said two output data signals. - View Dependent Claims (28)
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Specification