Name
Abstract | ||
|---|---|---|
Multiuser detection and turbo coding are two of the most powerful techniques for enhancing the performance of next-generation wideband CDMA systems. In this paper, we develop an iterative multiuser receiver structure for turbo-coded CDMA systems with aperiodic spreading sequences in a multipath fading environment, which exploits the power of both techniques. The key innovation in the proposed receiver is a low-complexity soft multiuser detector which uses the same decision statistic as the conventional RAKE receiver and performs soft-interference cancelation and instantaneous MMSE filtering. During iterations, extrinsic information is computed and exchanged by the soft multiuser detector and a bank of modified turbo decoders, to achieve successively refined estimate of the users' signal. The soft multiuser detector has a complexity of O(K-2) per bit per user, where K is the number of users. A single-user receiver which employs a soft RAKE detector followed by a turbo decoder is also considered. Simulation results demonstrate that under various channel impairment, such as multiple-access interference, multipath dispersion and time-variant fading, the proposed multiuser receiver offers significant performance gain over the single-user RAKE receiver. Moreover, it is seen that the turbo multiuser receiver in a multiuser environment even outperforms the single-user RAKE receiver in a single-user environment, because the RAKE receiver neglects intersymbol interference. |
Year | DOI | Venue |
|---|---|---|
2000 | 10.1109/ICC.2000.853629 | IEEE International Conference on Communications |
Keywords | DocType | ISSN |
complexity,turbo codes,iterative methods,performance,decoding,rake receiver,code division multiple access,fading,spread spectrum communication,signal detection,computational complexity,radio receivers,statistics,detectors,multipath fading,turbo code,intersymbol interference | Conference | 1550-3607 |
Citations | PageRank | References |
0 | 0.34 | 1 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Qing-Hua Li | 1 | 1563 | 88.15 |
| Xiaodong Wang | 2 | 1357 | 192.86 |
| Costas N. Georghiades | 3 | 301 | 32.18 |