Unipolar space-time codes with reduced decoding complexity for TH-UWB with PPM

Authors:
Chadi Abou-Rjeily;Mario Bkassiny
Affiliations:
Department of Electrical and Computer Engineering of the Lebanese American University, Byblos, Lebanon;Department of Electrical and Computer Engineering of the Lebanese American University, Byblos, Lebanon
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

In this paper, we consider the problem of Space-Time (ST) coding with unipolar Pulse Position Modulations (PPM) and propose a novel ST code that satisfies a large number of construction constraints rendering it superior to the existing PPM encoding schemes. In particular, the proposed 2 × 2 code achieves a full transmit diversity order while transmitting at a rate of 1 PPM-symbol per channel use. The proposed scheme can be associated with M-ary PPM constellations for all even values of M without introducing any constellation expansion. This renders the proposed scheme suitable for low cost carrier-less Ultra-Wideband (UWB) systems where information must be conveyed only by the time delays of the modulated sub-nanosecond pulses without introducing any amplitude amplifications or phase rotations. Finally, the proposed scheme can be associated with a reduced complexity optimal Maximum-Likelihood (ML) decoder that takes the structure of the proposed code into consideration in order to simplify the decoding procedure. We also propose a simple diversity-preserving suboptimal decoder that requires approximately half the number of multiplications compared to the ML decoder. Possible extensions to transmitters equipped with three antennas are also discussed in situations where a certain number of feedback bits is available.