CS-CDMA System with Binary Z-connectable Complete Complementary Codes
Hikaru Mizuyoshi, Chenggao Han · 2019
Convolutional spreading code division multiple access (CS-CDMA) system provides an inter-channel interference-free transmission. However, the CS operation of CS-CDMA involves high computational complexity and high peak-to-average power ratio. Addresing such drawbacks, we propose the use of binary Z-connectable complete complementary codes (BZ-CCC) to implement CS operation based on fast Walsh Hadamard transform. With the proposed implementation structure, the CS-CDMA based on BZ-CCC dramatically reduces the computational complexity of CS operation. Simulation results demonstrate that with inherited performance of the traditional CS-CDMA over Rayleigh fading channel, the proposed system has acceptable robustness against clipping noise and excellent robustness against Doppler frequency shifts.