A Multi-dimensional super-orthogonal modulation alternative to M-QAM WCDMA for next generation wireless applications

Abstract

This paper presents bit-error-rate (BER) performance results of an upwards-expandable Multidimensional super-orthogonal modulation alternative to M-ary quadrature amplitude modulation wideband code- division-multiple-access (M-QAM WCDMA), suitable for application in next generation WLAN and wireless cellular systems. The unique combination of a M=4-dimensional WCDMA modem configuration and super-orthogonal families of quasi-complementary root-of-unity filtered (RUF) near constant-envelope generalized-chirp-like complex spreading sequences (SO-CE-GCL-CSS), renders a spectrally and power efficient output signal with a data throughput rate equivalent to that of M=16-ary quadrature amplitude modulated (16-QAM) WCDMA, but with the BER performance equivalent to that of BPSK/QPSK in both additive white Gaussian noise (AWGN) and fading multipath channel scenarios, given identical spreading factors and bandwidths.