Multichannel multiuser detection
AssigneeMassachusetts Institute of Technology
InventorsKeith W. Forsythe, Daniel W. Bliss
Life of this patent
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Abstract
For multichannel multiuser detection in a wireless communication system such as a CDMA system, for a set of user spreading codes, coefficients to delay lines are adjusted and the delay line output processed to estimate a symbol. The symbol is estimated based on a space-time correlation for an antenna space delay time correlation. The estimated symbol is then remodulated and subtracted from the received antenna signal corresponding to other users of the wireless communication system. The adjusting and processing are iterated until the estimated symbols converge such that they correspond to a predetermined symbol decision criteria.
Claims32
A method of multichannel multiuser detection in a wireless communication system comprising:
- evaluating signals from plural antennas to tapped delay lines;
- for each of at least one users, dependent on a set of user spreading codes, adjusting coefficients to a delay line and processing the delay line and antenna outputs to estimate a symbol based on an estimated space-time correlation between antenna space and delay time;
- and
- remodulating the estimated symbol and applying the remodulated symbol to the antenna signals corresponding to other users of the wireless communication system.
A wireless communication system operable for multichannel multiuser detection comprising:
- a plurality of antennas each operable to receive a wireless signal;
- tapped delay lines adapted to receive the wireless signals, wherein the wireless signals correspond to a set of user spreading codes;
- a space-time correlator operable to adjust coefficients to the received wireless signals and process delay line outputs corresponding to the plurality of wireless signals to estimate a symbol based on an estimated space-time array response for an antenna space and delay time correlation;
- and
- a remodulator operable to remodulate the estimated symbol using the estimated space-time array response and subtract it from the received antenna signals of other users.
A computer program product having computer program code for multichannel multiuser detection in a wireless communication system comprising:
- computer program code for evaluating signals from plural antennas to a tapped delay line;
- computer program code for adjusting coefficients to a delay line for each of a plurality of users, the users dependent on a set of user spreading codes, and processing the delay line and antenna outputs to estimate a symbol based on an estimated space-time correlation between antenna space and delay time;
- and
- computer program code for remodulating the estimated symbol and applying the remodulated symbol to the antenna signals corresponding to other users of the wireless communication system.
A computer data signal on a computer readable medium for multichannel multiuser detection in a wireless communication system comprising:
- program code for evaluating signals from plural antennas to a tapped delay line;
- program code for adjusting coefficients to a delay line for each of a plurality of users, the users dependent on a set of user spreading codes, and processing the delay line and antenna outputs to estimate a symbol based on an estimated space-time correlation between antenna space and delay time;
- and
- program code for remodulating the estimated symbol and applying the remodulated symbol to the antenna signals corresponding to other users of the wireless communication system.
A wireless communication system operable for multichannel multiuser detection comprising:
- means for evaluating signals from plural antennas to a tapped delay line;
- means for adjusting coefficients to a delay line for each of a plurality of users, the users dependent on a set of user spreading codes, and processing the delay line and antenna outputs to estimate a symbol based on an estimated space-time correlation between antenna space and delay time;
- and
- means for remodulating the estimated symbol and applying the remodulated symbol to the antenna signals corresponding to other users of the wireless communication system.
Dependencies are inferred from the claim text.