Title :
Performance Analysis of Constellation Mapping and Channel Estimation in MB-OFDM UWB Systems
Author :
Li, Changyi ; Zheng, Guoxin ; Wang, Min
Author_Institution :
Dept. of Commun. Eng., Shanghai Univ.
Abstract :
In this paper, we investigate the influence of channel mismatch errors on the performance of multi-band OFDM (MB-OFDM) UWB systems according to different schemes of constellation mapping. The accuracy in the identification of time-invariant channel is limited either by errors in channel estimation or by noise. A model to analyze the effect of these factors is presented, from which the formula for bit error rate (BER) as a function of signal-to-noise ratio (SNR) is derived. We also analyze the channel estimation based on block-type training sequence and comb-type pilots with linear interpolation, as shown by simulation that the comb-type estimator with appropriate pilot arrangement can achieve better performance than block-type estimator for the typical UWB indoor channel which exhibits low frequency selectivity relatively
Keywords :
OFDM modulation; channel estimation; error statistics; indoor radio; ultra wideband communication; BER; MB-OFDM UWB systems; SNR; UWB indoor channel; bit error rate; block-type training sequence; channel estimation; comb-type pilots; constellation mapping; signal-to-noise ratio; time-invariant channel; Baseband; Bit error rate; Channel estimation; Frequency estimation; Interpolation; Intersymbol interference; OFDM; Performance analysis; Rayleigh channels; Signal to noise ratio;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2006. WiCOM 2006.International Conference on
Conference_Location :
Wuhan
Print_ISBN :
1-4244-0517-3
DOI :
10.1109/WiCOM.2006.122
