Title :
Linear multiuser receivers in random spreading with RAKE combining: turbo-coded system performance
Author :
Yoon, Seokhyun ; Bar-Ness, Yeheskel
Author_Institution :
Center for Commun. & Signal Process. Res., New Jersey Inst. of Technol., Newark, NJ, USA
Abstract :
We analyze the performance of linear CDMA multiuser receivers with RAKE combining in multipath fading channel and compare their BER performances in turbo-coded system. To simplify the analysis, we used similar approach to the standard Gaussian approximation. We assume the use of long spreading sequences for the conventional matched filter detector while short spreading sequences for linear multiuser receivers. To obtain the PDF of the combiner output SNIR, a simplified SNIR expression is derived by averaging over all possible combination of time and phase delays but conditioned on the channel gain and the random cross-correlations of spreading waveforms. Then, we evaluate their BER performances in a turbo-coded system by taking the average over the output SNIR. The approach shown can provide helpful insight for system design and planning in 3G wireless systems.
Keywords :
cellular radio; code division multiple access; delays; error statistics; fading channels; matched filters; multipath channels; multiuser channels; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; turbo codes; 3G wireless systems; BER performance; Gaussian approximation; PDF; RAKE combining; channel gain; combiner output SNIR; linear CDMA multiuser receivers; long spreading sequences; matched filter detector; multipath fading channel; multiuser detection; performance analysis; phase delay; random cross-correlations; random spreading; short spreading sequences; spreading waveforms; system design; system planning; time delay; turbo-coded system performance; Bit error rate; Delay effects; Detectors; Fading; Gaussian approximation; Matched filters; Multiaccess communication; Performance analysis; RAKE receivers; Turbo codes;
Conference_Titel :
Signals, Systems and Computers, 2001. Conference Record of the Thirty-Fifth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7147-X
DOI :
10.1109/ACSSC.2001.987784
