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.

fYear

2006

fDate

22-24 Sept. 2006

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing, 2006. WiCOM 2006.International Conference on

Conference_Location

Wuhan

Print_ISBN

1-4244-0517-3

Type

conf

DOI

10.1109/WiCOM.2006.122

Filename

4149299