Transmitter diversity technique for wireless communications
First Claim
1. A receiver comprising:
- a combiner adapted to receive a block of symbols transmitted with frequency diversity or time diversity, the block of symbols including a first symbol and a second symbol transmitted from a first antenna and a complex conjugate of the first symbol and a negative complex conjugate of the second symbol transmitted from a second antenna, wherein the combiner is configured to combine the block of symbols and supply a first output signal and a second output signal; and
a detector coupled to the combiner to receive the first and second output signals and to recover the first symbol and the second symbol.
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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 simple arithmetic operations, such as negation and conjugation. The diversity created by the 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 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
14 Claims
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1. A receiver comprising:
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a combiner adapted to receive a block of symbols transmitted with frequency diversity or time diversity, the block of symbols including a first symbol and a second symbol transmitted from a first antenna and a complex conjugate of the first symbol and a negative complex conjugate of the second symbol transmitted from a second antenna, wherein the combiner is configured to combine the block of symbols and supply a first output signal and a second output signal; and a detector coupled to the combiner to receive the first and second output signals and to recover the first symbol and the second symbol. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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receiving in a combiner a block of symbols transmitted with frequency diversity or time diversity, the block of symbols including first symbol and a complex conjugate of the first symbol and a second symbol and a negative complex conjugate of the second symbol, the first symbol and the complex conjugate of the first symbol transmitted with space diversity using a first antenna and a second antenna, the second symbol and the negative complex conjugate of the second symbol transmitted with space diversity using the first antenna and the second antenna, wherein the combiner combines the block of symbols and supplies a first output signal and a second output signal; and receiving in a detector the first output signal and the second output signal from the combiner and generating a recovered first symbol and a recovered second symbol based on the block of symbols transmitted with frequency diversity or time diversity. - View Dependent Claims (6, 7)
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8. A system comprising:
a receiver for receiving wireless communication signals transmitted from a transmitter, the receiver including, a combiner adapted to receive a block of symbols transmitted with frequency diversity or time diversity, the block of symbols including a first symbol and a second symbol respectively transmitted from a first antenna and a second antenna and a complex conjugate of the first symbol and a negative complex conjugate of the second symbol transmitted respectively from the second antenna and the first antenna, wherein the combiner is configured to combine the block of symbols and supply a first output signal and a second output signal; and a detector coupled to the combiner to receive the first and second output signals and to recover the first symbol and the second symbol. - View Dependent Claims (9, 10, 11, 12, 13, 14)
Specification