Title :
A frequency domain equalizer for WLAN 802.11g single-carrier transmission mode
Author :
Hsiao, Frank H. ; Hsu, Terng-Yin
Author_Institution :
Dept. of Comput. Sci. & Inf., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
In this paper, a frequency domain equalizer is proposed for WLAN 802.11g single-carrier transmission mode. Channel estimation is achieved with a modified recursive least square (RLS) algorithm in the frequency domain. For channel compensation, OFDM-like frequency domain zero-forcing equalization is performed with FFT units and a complex divider. In 802.11g single-carrier mode, transmission packets are not equipped with cyclic prefixes so signal overlapping and discarding using sliding windows are maintained at each equalization process to decrease the symbol estimation error caused by circularly de-convoluting a linear channel convolution process. With the single carrier mode equalizer implemented in the frequency domain many of the computation resources can be shared with an 802.11g OFDM equalizer offering a low complexity multimode receiver solution.
Keywords :
channel estimation; compensation; deconvolution; equalisers; fast Fourier transforms; least squares approximations; recursive estimation; wireless LAN; FFT units; OFDM equalizer; OFDM-like zero-forcing equalization; RLS algorithm; WLAN 802.11g single-carrier transmission mode; channel circular deconvolution; channel compensation; channel estimation; complex divider; frequency domain equalizer; low complexity multimode receiver; recursive least square algorithm; sliding window based signal overlapping/discarding; symbol estimation error; Channel estimation; Convolution; Equalizers; Estimation error; Frequency domain analysis; Least squares approximation; OFDM; Resonance light scattering; Signal processing; Wireless LAN;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465658
