Abstract
This paper addresses cyclic delay diversity (CDD) in an ultra-wideband communication system based on orthogonal frequency division multiplexing (OFDM) technique. Symbol error rate and outage probability have been derived. It is shown that with only two transmit antennas, CDD effectively improves SER performance and reduces outage probability significantly especially when the channel delay spread is short. Both simulation and analytical results agree well in all considered cases. The selection of delay times for CDD is also addressed for some special cases.
Highlights
Wireless personal area network (WPAN) using ultrawideband (UWB) communication has received great interest due to its capability of transmitting very high bit rate over short range
MB-orthogonal frequency division multiplexing (OFDM) has been adopted in the WiMedia standard as a transmission technique for UWB systems becoming ISO standard [3]
Simulation and analytical results show that cyclic delay diversity (CDD) improves the symbol error rate (SER) performance and reduces outage probability significantly due to its diversity advantage
Summary
Wireless personal area network (WPAN) using ultrawideband (UWB) communication has received great interest due to its capability of transmitting very high bit rate over short range. That means CDD yields higher-frequency selectivity and the error performance is improved when coding is applied across subcarriers. CDD converts spatial diversity associated with multiple transmit antennas into frequency diversity in the equivalent single antenna system. This technique is elegant and beneficial because diversity gain can be achieved without modification at the receiver (or at the transmitter in the case of CDD applied at the receiver). This paper exploits CDD which aims to improve the performance of UWB-OFDM system with low complexity. Simulation and analytical results show that CDD improves the SER performance and reduces outage probability significantly due to its diversity advantage. The notations in this paper will closely follow those in [12] for consistency
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