Spreading sequences for asynchronous MC-CDMA revisited: accurate bit error rate analysis

The bit error rate (BER) of an asynchronous multicarrier code-division multiple-access system in an additive white Gaussian noise channel is evaluated using Monte Carlo integration and moment-generating function methods. The BER performance for different families of spreading sequences is investigated. Numerical results show that the approach of a recently published paper cannot give an accurate BER because the interference from other subcarriers has been omitted. Some new findings about the performance of different sequences are also presented. Index Terms--Moment-generating function, Monte Carlo integration, multicarrier code-division multiple access (MC-CDMA), spreading sequences.