DocumentCode :
2947720
Title :
MMSE equalization of OFDM/OQAM systems for channels with time and frequency dispersion
Author :
Holte, Nils
Author_Institution :
Norwegian Univ. of Sci. & Technol., Trondheim, Norway
fYear :
2009
fDate :
13-15 Nov. 2009
Firstpage :
1
Lastpage :
5
Abstract :
An MMSE per channel fractionally spaced equalizer is developed for an OFDM/OQAM system with a time varying channel, under the assumption of perfect channel knowledge at the receiver. The equalizer is analyzed for an example with a doubly dispersive channel with Jakes Doppler spectrum and an exponential delay profile, and where the transmitter and receiver filters are square root of cosine rolloff. The performance is measured in terms of ergodic channel capacity, which will be an upper bound for the throughput of the system, assuming perfect channel estimation and ideal channel coding. The results show that the channel capacity may be significantly increased by using an equalizer of finite length, instead of a one-tap equalizer. The channel capacity is for instance increased by 60% for Es/N0 = 20 dB in a channel with spreading factor 0.01.
Keywords :
OFDM modulation; channel capacity; channel coding; channel estimation; filters; least mean squares methods; quadrature amplitude modulation; receivers; transmitters; Jakes Doppler spectrum; MMSE equalization; OFDM systems; OQAM systems; channel coding; channel estimation; cosine rolloff square root; ergodic channel capacity; frequency dispersion; one-tap equalizer; receiver filters; time dispersion; time varying channel; transmitter filters; Channel capacity; Delay; Dispersion; Equalizers; Filters; OFDM; Throughput; Time varying systems; Transmitters; Upper bound; Channel Capacity; Equalization; OFDM; OQAM;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications & Signal Processing, 2009. WCSP 2009. International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-4856-2
Electronic_ISBN :
978-1-4244-5668-0
Type :
conf
DOI :
10.1109/WCSP.2009.5371391
Filename :
5371391
Link To Document :
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