CDMA Systems Engineering Handbook
CDMA Systems Engineering Handbook
Some considerations of DS-SS BPSK spectral density and error rate of a high bit rate rake
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
IEEE Transactions on Wireless Communications
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In high bit rate DS-SS BPSK mobile radio reverse links with RAKE demodulators the frequency selective channel causes intersymbol interference. For many years the standard Gaussian approximation error rate has been used and for high bit rates its accuracy is not known. We compare the Gaussian approximation to error rate derived using total probability theorem, Chernoff and Prabhu bounds with true statistics of intersymbol interference. For signal-to-noise ratio's (SNR's) greater than 6dB (cases of interest), we show that the Gaussian approximation is a much looser upper bound than our bounds. The Prabhu bound which can be tailored to different intersymbol interference conditions is the tightest bound. We show that the RAKE combats incoherent intersymbol interference while the immunity it offers decreases for SNR's greater than 10dB. Finally, a dual space diversity RAKE provides an 8dB space diversity gain.