Title :
Adaptive multiuser parallel-decision-feedback with iterative decoding
Author :
Honig, Michael L. ; Woodward, Graeme ; Alexander, Paul D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Northwestern Univ., Evanston, IL, USA
Abstract :
We combine the adaptive (least squares) parallel-multiuser decision feedback detector for CDMA with short spreading sequences, presented by Ratasuk et al. (see In Proc. Allerton Conf., Monticello, IL, 1999), with iterative (turbo) decoding and soft cancellation, presented by Alexander et al. (see European Trans. on Telecomm., vol.9, no.5, p.419-25, 1998). The resulting receiver requires only a training sequence and (coarse) timing for estimation of all filter coefficients, and performs close to the single-user bound with relatively low Eb /N0. Prior knowledge of spreading codes and channels is unnecessary. For simplicity, we consider a synchronous CDMA system
Keywords :
adaptive signal detection; code division multiple access; feedback; iterative decoding; least squares approximations; radio receivers; spread spectrum communication; turbo codes; CDMA; adaptive multiuser parallel-decision-feedback; coarse timing; filter coefficients estimation; iterative decoding; least squares detector; parallel-multiuser decision feedback detector; receiver; short spreading sequences; single-user bound; soft cancellation; synchronous CDMA system; training sequence; turbo decoding; Australia; Convolutional codes; Design for disassembly; Detectors; Error analysis; Feedback; Filters; Iterative decoding; Least squares methods; Multiaccess communication;
Conference_Titel :
Information Theory, 2000. Proceedings. IEEE International Symposium on
Conference_Location :
Sorrento
Print_ISBN :
0-7803-5857-0
DOI :
10.1109/ISIT.2000.866633
