Coded multicarrier DS-CDMA in the presence of partial band interference

This paper presents a multicarrier asynchronous direct sequence (DS) code division multiple access (CDMA) system, wherein the output of a convolutional encoder modulates multiple bandlimited DS-CDMA waveforms which are transmitted in parallel at different carrier frequencies. The receiver detects and combines signals for the desired user and feeds a soft decision Viterbi decoder. The performance of this system is compared to that of a conventional single carrier DS-CDMA system with a RAKE receiver, assuming a slowly varying, frequency selective, Rayleigh fading channel and assuming the presence of AWGN, multiple access interference, and partial-band interference. Results will demonstrate similar performance at roughly equal receiver complexity in the absence of partial-band interference, and superior performance of the multicarrier system in the presence of partial-band interference