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Decision-feedback blind adaptive multiuser detector for synchronous CDMA system

He Ping, Tjeng Thiang Tjhung, L.R. Rasmussen
2000 IEEE Transactions on Vehicular Technology  
In this paper, we develop a blind adaptive multiuser detector for synchronous code-division multiple access (CDMA) with a noise-whitening filter. The triangular structure of the noisewhitened model ensures complete resolution of detection ambiguities. To further improve the symbol error probability performance, we introduce decision feedback in our detector similar to the decorrelating decision-feedback detector (DDFD), thus forming the decision-feedback blind adaptive multiuser detector
more » ... ser detector (DFBD). Simulations indicate that the performance of the DFBD is very close to that of the DDFD in additive white Gaussian noise (AWGN) channels. In Rician fading channels, the DFBD can track the slowly varying channels well and has symbol error probability performance approaching that of the DDFD, which requires the knowledge of users' energies. The blind adaptive and decision-feedback blind adaptive multiuser detectors proposed here do not, however, require that knowledge. Index Terms-Blind adaptive multiuser detection, decision feedback, symbol error probability, synchronous CDMA system.
doi:10.1109/25.820707 fatcat:7zn4lbltjjgulawntc7f5znjh4