Institution of Engineering and Technology (IET)Islam, SMR.; Ullah, S.; Lloret, J.; Ullah, N.; Kwak, KS. (2015). SIR performance evaluation of MB-OFDM UWB system with residual timing offset. Electronics Letters. 51 (5) Signal-to-interference ratio (SIR) performance of a multiband orthogonal frequency division multiplexing ultra-wideband system with residual timing offset is investigated. To do so, an exact mathematical derivation of the SIR of this system is derived. It becomes obvious that, unlike a cyclic prefixing based system, a zero padding based system is sensitive to residual timing offset.Introduction: Multiband orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) uses zero padding (ZP) instead of cyclic prefixing (CP), since the use of ZP confirms symbol recovery irrespective of the channel zero locations vis-à-vis superior computational complexity. There are several preamble based symbol synchronisation methods for ZP MB-OFDM systems [1][2][3][4][5][6][7][8][9][10]. The best practice in achieving satisfactory symbol synchronisation in ZP MB-OFDM UWB system is to follow a three-step approach consisting of sync detection, coarse-timing estimation and fine-timing estimation. Nevertheless, the use of further timing error or residual timing offset hereafter is obvious. The effect of residual fractional timing errors in terms of signal-to-interference ratio (SIR) is characterised in [11] for CP-based OFDM system. Sensitivity of a ZP MB-OFDM UWB system to synchronisation error has been analysed in [12], where the system is found sensitive to carrier frequency offset. However, the effect of integer timing errors on SIR performance of the available timing estimation algorithms has always been ignored. Given this perspective, we explore an exact mathematical analysis to show the impact of the residual timing offset on SIR in ZP MB-OFDM UWB system.
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