The WLAN market is bloomed due to the need for a broadband high-speed wireless access technique. Spectrum allocation in the 5-GHz range and standardization of up to 54 Mbps 64 QAM systems in the IEEE 802.11a for the USA has accelerated the migration from research results into implementable solutions. The performance of WLAN is limited by the channel, which distorts the signal due to reflections and scattering. The in-house channel has a rms delay spread of 5 to 40 ns. The coherence bandwidth is between 5 and 25 MHz, which results in the frequency selective nature of the channel. Fortunately, it can be considered as quasi-static due to limited object movements. OFDM is the favored multicarrier transmission scheme, in which modulation and frequency spacing are efficiently performed by an inverse fast Fourier transform (IFFT) on a set of constellation signal points. Cyclic prefix (CP) technique is adopted to serve as a guard band, which also makes OFDM block pseudocyclic [1].