Bit Error Rate Evaluation for Spread-Spectrum Multiple-Access Systems

Hybrid DS/SFH-SSMA with predetection diversity and coding over indoor radio multipath Rician-fading channels

“…In order to obtain analytical results for the BER, it will be assumed that both the multipath interference and the multi-access interference terms are well approximated by Gaussian random variables. Hence, we can combine the various disturbances into a single Gaussian random variable with zero mean and variance of given by 02 = NOT + 2PT2{ Po + 2{ [AT/2 + PI] khL + [ A 3 2 + Po] ( L -1 ) ) / ( 3 N ) } (15) where k h denotes the number of hitting nonreference users.…”

“…The resulting bit error rate (BER) after hard decision decoding is approximately given by (see [12]) where n is the number of bits in a codeword and t denotes the number of errors that the code can correct. In our discussion, the considered block codes are the Hamming (7,4) code, the BCH (15,7) code and the Golay (23, 12) code. The first one can correct one error (t = l ) , the second one can correct two errors (t = 2) and the third one can correct up to three errors (t = 3) in a block.…”

Accurate BER Analysis of QPSK Modulated Asynchronous DS-CDMA Systems Communicating over Rayleigh Channels

“…The Bit Error Ratio (BER) performance of Direct-Sequence (DS) CDMA systems has been extensively studied, especially in the context of BPSK [1]- [19] and QPSK [4], [5], [7], [9], [16], [19]- [26] modulation.…”

“…BER bounds were also derived in [7], [8], [11], [22]. To avoid the complexity of the accurate BER analysis and the inaccuracy of various approximations, the SNR performance was investigated in [12], [20], [24].…”

“…The BER performance attainable using both deterministic spreading sequences [4], [7], [11], [13], [20], [21] and random spreading sequences [1]- [3], [5], [6], [8]- [10], [14]- [19], [22], [23], [25], [26] was also investigated.…”