A frequency domain equalizer for WLAN 802.11g single-carrier transmission mode

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.