Blind Multiuser Detector of TH-UWB with HMM and DLMS

For impulse radio UWB systems, a novel multi-user detector with HMM and decorrelation least mean square (DLMS) is proposed. HMM systems for the time-hopping BPSK in IR-UWB are developed separately in the paper. Considering looking for the sequence of maximal transition probability corresponding to previous sequence, a framework for the design of the maximum a posteriori (MAP) multi-user detector has been constructed using HMM and DLMS. The techniques are completely blind in the sense that no knowledge of signatures, channel state information is required for any user. The presented algorithm is applied to the estimate of its physical channel response and the original information. Numerical simulations reveal that the proposed detection methods can rapidly converged to the original channel information and provide significant performance improvements in terms of bit error rate over the conventional single-user UWB detector.