MIMO OFDM system
First Claim
1. A method for MIMO-OFDM communication, comprising encoding a first data block into a first plurality of encoded signals;
- encoding a second data block into a second plurality of encoded signals;
transmitting each of the first and second pluralities of encoded signals on respective transmit antennas;
receiving the transmitted signals on a plurality of receive antennas;
pre-whitening the receive signals for each of the first and second data block signals;
performing maximum likelihood detection on each of the pre-whitened received signals; and
performing successive interference cancellation on the received signals.
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Accused Products
Abstract
A MIMO OFDM system includes a plurality of space-time encoders for encoding respective data blocks with independent space-time codes. The transformed data block signals are transmitted by a plurality of transmit antennas and received by a plurality of receive antennas. The received data is pre-whitened prior to maximum likelihood detection. In one embodiment, successive interference cancellation can be used to improve system performance. Channel parameter estimation can be enhanced by weighting the channel impulse response estimates based upon a deviation from average.
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Citations
17 Claims
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1. A method for MIMO-OFDM communication, comprising
encoding a first data block into a first plurality of encoded signals; -
encoding a second data block into a second plurality of encoded signals;
transmitting each of the first and second pluralities of encoded signals on respective transmit antennas;
receiving the transmitted signals on a plurality of receive antennas;
pre-whitening the receive signals for each of the first and second data block signals;
performing maximum likelihood detection on each of the pre-whitened received signals; and
performing successive interference cancellation on the received signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for MIMO-OFDM communication, comprising;
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providing a first data block to a first space-time encoder that generates first and second coded signals;
transmitting the first coded signal from a first transmit antenna;
transmitting the second coded signal from a second transmit antenna;
providing a second data block to a second space-time encoder that generates third and fourth coded signals, wherein each of the first, second, third and fourth coded signals forms a respective OFDM block;
transmitting the third coded signal from a third transmit antenna;
transmitting the fourth coded signal from a fourth transmit antenna;
receiving the first, second, third and fourth coded signals on a plurality of receive antennas;
pre-whitening the received signals for the first data block signal;
performing maximum likelihood decoding on the pre-whitened first data block signal;
pre-whitening the received signals for the second data block signal;
performing maximum likelihood decoding on the pre-whitened second data block signal; and
regenerating the received signal, removing the first data block signal from the received signal, and re-decoding the second data block signal when the decoded first data block has a higher signal quality than the decoded second data block. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for MIMO-OFDM communication, comprising:
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encoding a first data block into a first plurality of encoded signals;
encoding a second data block into a second plurality of encoded signals;
transmitting each of the first and second pluralities of encoded signals on respective transmit antennas;
receiving the transmitted signals on a plurality of receive antennas. decoding the first and second data block signals; and
estimating channel parameters by weighting channel response estimates based upon a deviation from average.
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Specification