Signal Design for Improved Multiple Access Capacity in DS-UWB Communication

The paper addresses the signal design and performance analysis of direct-sequence ultra-wideband (DS-UWB) multiuser communication employing offset quadrature-spread phase shit keying (OQPSK) modulation with novel chip waveforms. Analytical bit error rate (BER) performance analysis is derived for different receiver structures, emphasizing the impact of the chip mean-squared auto-correlation function (MS-ACF) on BER performance in multiuser and multipath environments. A low-complexity flexible algorithm for designing chip pulses that maximize multiuser system capacity by minimizing the chip MS-ACF is proposed. The optimized waveforms are based on the use of prolate spheroidal wave function (PSWF) expansions. The proposed schemes also provide increased spectrum placement flexibility and minimized phase jumps compared to carrier-less pulse amplitude modulation (PAM) UWB schemes. Several design examples and numerical results are presented to illustrate the relative performance of the novel pulses compared to UWB schemes employing Gaussian monocycle derivatives and modified Hermite polynomials, and it is shown that a clear improvement in multiple access capacity can be achieved by the proposed PSWF-based pulses, particularly with maximum ratio combining receivers.

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