MIMO RECEIVER USING ML DEPTH-FIRST AND K-BEST DETECTORS FOR SNR HIGHER AND LOWER THAN A THRESHOLD

摘要

A system detects symbols communicated from multiple transmitting antennas (102) to multiple receiving antennas (104). An evaluator (108) estimates the SNR of the signals received at the receiving antennas. The evaluator enables a first detector (110) in response to the SNR being lower than the threshold (114), and the evaluator enables a second detector (112) in response to the SNR being higher than the threshold (114). The first detector is preferably a K-best detector, the second detector is preferably an ML depth-first sphere detector. The second detector has a lower bit error rate than the first detector. The computational complexity of the first detector is constant, while the computational complexity of the second detector is lower at high SNR and higher at low SNR.