DocumentCode :
2503175
Title :
Doppler Spread Estimation for Broadband Wireless OFDM Systems
Author :
Tao, Jun ; Wu, Jingxian ; Xiao, Chengshan
Author_Institution :
Univ. of Missouri, Columbia
fYear :
2007
fDate :
26-30 Nov. 2007
Firstpage :
2878
Lastpage :
2882
Abstract :
In this paper, we present a new Doppler spread estimation algorithm for broadband wireless orthogonal frequency division multiplexing (OFDM) systems with time-varying and frequency-selective Rayleigh fading. The algorithm is developed by analyzing the statistical properties of the power of received signals in the time domain, thus it excludes the influence of inter- carrier interference introduced by channel variation within one OFDM symbol. The operation of the algorithm doesn´t require the knowledge of fading coefficients, transmitted data symbols, or signal-to-noise ratio (SNR). It works well under time-selective and frequency-selective Rayleigh fading channel with SNR as low as 0 dB. Moreover, unlike existing algorithms, the proposed algorithm takes into considerations of the discrete-time channel inter-tap correlation, as the case in practical systems. Simulation results demonstrate that this new algorithm can accurately estimate a wide range of Doppler spread with low estimation latency and high computational efficiency.
Keywords :
OFDM modulation; broadband networks; fading channels; intercarrier interference; radio networks; Doppler spread estimation; broadband wireless OFDM systems; broadband wireless orthogonal frequency division multiplexing systems; discrete-time channel intertap correlation; frequency-selective Rayleigh fading channel; intercarrier interference; signal-to-noise ratio; Algorithm design and analysis; Fading; Frequency estimation; Interference; OFDM; Rayleigh channels; Signal analysis; Signal to noise ratio; Time domain analysis; Time varying systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-1042-2
Electronic_ISBN :
978-1-4244-1043-9
Type :
conf
DOI :
10.1109/GLOCOM.2007.545
Filename :
4411455
Link To Document :
بازگشت