Low complexity maximum likelihood detection of concatenated space codes for wireless applications
First Claim
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1. An apparatus comprising:
- a trellis encoder that generates a first symbol and a second symbol;
a block encoder coupled to receive the first and second symbols and generate a block of symbols, the block of symbols including the first symbol, the second symbol, a complex conjugate of the first symbol and a negative complex conjugate of the second symbol; and
a first antenna and a second antenna coupled to the block encoder to transmit the block of symbols, the first symbol and the complex conjugate of the first symbol being transmitted with space diversity and with time diversity and the second symbol and the negative complex conjugate of the second symbol being transmitted with space diversity and with time diversity.
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Abstract
Good transmission characteristics are achieved in the presence of fading with a transmitter that employs a trellis coder followed by a block coder. Correspondingly, the receiver comprises a Viterbi decoder followed by a block decoder. Advantageously, the block coder and decoder employ time-space diversity coding which, illustratively, employs two transmitter antennas and one receiver antenna.
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Citations
10 Claims
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1. An apparatus comprising:
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a trellis encoder that generates a first symbol and a second symbol; a block encoder coupled to receive the first and second symbols and generate a block of symbols, the block of symbols including the first symbol, the second symbol, a complex conjugate of the first symbol and a negative complex conjugate of the second symbol; and a first antenna and a second antenna coupled to the block encoder to transmit the block of symbols, the first symbol and the complex conjugate of the first symbol being transmitted with space diversity and with time diversity and the second symbol and the negative complex conjugate of the second symbol being transmitted with space diversity and with time diversity. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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trellis encoding received data to generate a first symbol and a second symbol; block encoding the first and second symbols to generate a block of symbols that includes the first and second symbols, a negative complex conjugate of the second symbol, and a complex conjugate of the first symbol; and transmitting the block of symbols by transmitting the first symbol and the complex conjugate of the first symbol at different times and over different channels and transmitting the second symbol and the negative complex conjugate of the second symbol at different times and over different channels. - View Dependent Claims (7)
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8. A receiver comprising:
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a space block combiner configured to receive a transmitted block of symbols and supply output signals, the transmitted block of symbols including a first symbol, a second symbol, a complex conjugate of the first symbol and a negative complex conjugate of the second symbol; and a Viterbi decoder coupled receive the output signals from the space block combiner. - View Dependent Claims (9, 10)
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Specification