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Dual-Transceiver Quantization Can Improve Error Performance in CDMA

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4 Author(s)
Hadar Efraim ; Dept. of Phys., Bar-Ilan Univ., Ramat-Gan ; Nadav Yacov ; Ido Kanter ; Ori Shental

A K-user direct-sequence spread-spectrum code- division multiple-access (CDMA) system with (q << log2 K) -bit baseband signal quantization at the demodulator is considered. It is shown that additionally quantizing the K + 1 level output signal of the CDMA modulator into q bits improves significantly the average bit-error performance in a non-negligible regime of noise variance, sigma2, and user load, beta, under various system settings, like additive white Gaussian noise (AWGN), Rayleigh fading, single-user detection, multi-user detection, random and orthogonal spreading codes. For the case of single-user detection in random spreading AWGN-CDMA, this regime is identified explicitly as sigma < gamma(q)yradicbeta, where gamma(q) is a certain pre-factor depending on q, and the associated BER improvement is derived analytically for q = 1, 2. For the other examined system settings, computer simulations are provided, corroborating this interesting behavior.

Published in:

2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications

Date of Conference:

25-28 Aug. 2008