Single Carrier Frequency Domain Equalization

Abstract

As the demand of wireless services is rising, there is a need to transmit high-speed packets over the wireless communication channel. Broadband data transmission over wireless channels commonly faces the challenges of multipath fading channels, which are both time and frequency selective. Orthogonal frequency division multiplexing (OFDM) has become widely accepted as transmission technique primarily because of its robustness against frequency selective fading channels, but it suffers a number of drawbacks such as high peak-to-average power ratio (PAPR), intolerance to amplifier nonlinearities, and high sensitivity to carrier frequency offsets (CFOs). SINGLE CARRIER Frequency Domain Equalization (SCFDE) is an alternative to OFDM that avoids OFDM drawbacks. Single carrier with frequency domain equalization (SCFDE) transmission utilizes single carrier modulation at the transmitter, and it performs frequency domain equalization at the receiver. SC-FDE is a technique in which, similar to OFDM, equalization is performed in the frequency domain, but has the advantage of having lower PAPR. This is important especially in the uplink communications, where lower PAPR greatly benefits the mobile terminal in terms of transmit power efficiency and manufacturing cost. In SC-FDE, Equalization is done for single carrier transmission by inserting cyclic-prefix (CP) in the transmitter and Multiplying by a single equalization tap in the frequency domain at the receiver. The objective of this work is to design a single carrier frequency domain equalization systems using space time block code and receiver diversity which provides a satisfactory performance under slow fading environment.