Asymptotic analysis of the conventional decision feedback receiver in flat fading channels

TitleAsymptotic analysis of the conventional decision feedback receiver in flat fading channels
Publication TypeConference Paper
Year of Publication2002
AuthorsDjonin, D. V., and V. K. Bhargava
Conference NameCommunications, 2002. ICC 2002. IEEE International Conference on
Pagination1368 - 1372 vol.3
Keywordsasymptotic analysis, CDFR, cellular radio, code division multiple access, communication system, data rate per unit bandwidth, decision feedback receiver, diversity reception, DS-CDMA systems, estimation error, fading channels, fading environment, feedback, flat fading channels, imperfect power control, imperfectly estimated channel gain, interference suppression, large system random signature model, linear multiuser receiver, multi-cell cellular networks, multiple access system, multiuser channels, multiuser diversity, nonfading environment, optimal multiuser receiver, power control, power diversity, power equalization, radio receivers, radiofrequency interference, spectral analysis, spectral efficiency, spread spectrum communication, successive interference canceler, synchronous reception, telecommunication control

The spectral efficiency presents the ultimate limit on the data rate per unit bandwidth of a certain communication system. For the DS-CDMA systems spectral efficiency has been derived for optimal and linear multiuser receivers in the case of synchronous reception, fading and non-fading environment as well as single and multi-cell cellular networks. The most pervasive model employed in all these analyses is the large system random signature model. For the decision feedback receivers the previous research handled only the non-fading case while the case of fading channels remained unknown. This paper analyses the spectral efficiency of the decision feedback receiver in a fading channel with and without power ordering. The results show that in the case of power ordering before cancellation the multiuser diversity effect previously encountered by S. Shamai (Shitz) and Verdu (see IEEE Trans. on Inform. Theory, vol.47, p.1302-27, May 2001) occurs. Multiuser diversity is the effect where the spectral efficiency of a certain multiple-access system improves in fading channels due to the multiplicity of users that share the system and provide the necessary power diversity. Also, analyzed in this paper is the case of imperfectly estimated channel gains in fading environments or the case of imperfect power control. The spectral efficiency loss incurred by this estimation error is analyzed in the case of the conventional decision feedback receiver.


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