Adaptive differentially coherent modulation for DS∕CDMA systems in cellular radio channels

Ghavami, Kamran; Shiva, M.

doi:10.1049/ip-com:20040363

Cited by 1 publication

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, the applications of differential detection for DS/CDMA systems were proposed in References [12][13][14][15]. In Reference [12], the parameters of transmitter and receiver with differentially coherent detection are adjusted according to channel conditions to overcome one drawback of error correction code. In Reference [13], Madhow et al proposed the differential minimum mean square error (MMSE) criterion which is a constrained optimisation and robust to fast fading.…”

Section: Introductionmentioning

confidence: 99%

Adaptive MDPSK DS/CDMA receivers with performance analysis

Chen

Ueng

Tsai

et al. 2009

Trans Emerging Tel Tech

View full text Add to dashboard Cite

For direct-sequence code-division multiple-access (DS/CDMA) systems, the multiuser and multipath interferences are always present. When the demodulation is coherent, a coherent carrier reference must be generated prior to demodulation. The generation of coherent reference at low signal-to-interference-and-noise ratio (SINR) is difficult. In the downlink CDMA communications, numbers of active Users transmit information simultaneously by different signature waveform. However. the multipath channel and multiple-access interference (MAI) limit the system capacity. Adaptive single-user receivers do not require knowledge of MAI parameters and need fewer computations. In this paper. we propose adaptive receivers with decision-feedback differential detection (DF-DD) and compare variations of the receiver structure proposed in Schrober's paper for noncoherent channels. In the absence of knowledge of the carrier phase, we derive the minimum mean square error (MMSE) of the proposed receivers to show that the performances of the proposed receivers with M-ary differential phase-shift keying (MDPSK) signals approach that of the coherent receiver with MPSK signal. Some simulation examples are given to demonstrate the effectiveness and compare the performances of the proposed adaptive receivers. Copyright (C) 2008 John Wiley & Sons, Ltd

show abstract