Wireless receiver for turbo loop multiuser detection incorporating prior loop residual estimation errors

A system for decoding and modeling a plurality of data streams the system comprising:

• a receiver unit configured to receive a plurality of data streams from a plurality of signal sources included in a received transmission, each data stream including a corresponding plurality of known reference symbols and a plurality of unknown data;
• and
• a signal processing unit configured to:
• determine a channel estimate for each of the data streams based on the corresponding plurality of known reference signals;
• equalize the data streams included in the transmission according to said channel estimates;
• demodulate the equalized data streams;
• decode the data symbols for any of the data streams that can be accurately decoded, and estimate all remaining data symbols for all remaining data streams;
• calculate a residual error for each of the estimated data streams;
• remodulate the estimated and decoded data streams;
• obtain a residual transmission by removing from the received transmission all decoded data streams;
• for each of the estimated data streams, model the data stream by subtracting all of the other estimated data streams from the residual transmission;
• equalize the modeled data stream according to the channel estimates and the residual errors for each of the estimated data streams that has not been accurately decoded;
• and
• repeatedly apply to the residual transmission in a loop the steps of demodulating, decoding, estimating, calculating, remodulating, obtaining a residual transmission, modeling, and equalizing until a loop termination requirement has been met.

A non-transitory computer readable medium storing a computer program, executable by a machine, for decoding and modeling a plurality of data streams, the computer program comprising executable instructions for:

• receiving a transmission including a plurality of data streams from a plurality of signal sources, each data stream including a plurality of corresponding known reference symbols and a plurality of unknown data symbols;
• determining a channel estimate for each of the data streams based on the corresponding plurality of known reference signals;
• equalizing the data streams included in the transmission according to said channel estimates;
• demodulating the equalized data streams;
• decoding the data symbols for any of the data streams that can be accurately decoded, and estimating all remaining data symbols for all remaining data streams;
• calculating a residual error for each of the estimated data streams;
• remodulating the estimated and decoded data streams;
• obtaining a residual transmission by removing from the received transmission all decoded data streams;
• for each of the estimated data streams, modeling the data stream by subtracting all of the other estimated data streams from the residual transmission;
• equalizing the modeled data stream according to the channel estimates and the residual errors for each of the estimated data streams that has not been accurately decoded;
• and
• repeatedly applying to the residual transmission in a loop the steps of demodulating, decoding, estimating, calculating, remodulating, obtaining a residual transmission, modeling, and equalizing until a loop termination requirement has been met.