Abstract:
Broadband wireless access systems deployed in residential and business environment face hostile radio propagation environment due to multipath delay spread that extends over tens or hundreds of bit intervals. Multipath fading is a physical layer phenomenon and it has detrimental effects on the Quality of Service (QoS) parameters like Bit Error Rate (BER) and Packet Error Rate (PER) because of its stochastic nature.
Orthogonal Frequency Division Multiplexing (OFDM) is a recognized multicarrier solution to combat the multipath effects. An alternative to OFDM which gives better performance in some of the scenarios is the frequency domain equalized Single-Carrier (SC) modulated System. The application of frequency domain equalization (FDE) makes single carrier-modulated system a potentially valuable alternative to OFDM, especially about its robustness to RF implementation impairments. Usually SC modulated systems with FDE have decision feedback in time domain which involves convolution. As convolution is a slower process as compared to multiplication in frequency domain thus if Single Carrier modulated signal is equalized with decision feedback system in frequency domain can give better results.
In this thesis, simulations have been carried out to evaluate the performance of proposed frequency domain decision feedback equalization based single carrier modulated system for different wireless channel models and it is has been observed that the proposed method has increased computational speed and is less sensitive than OFDM to RF impairments such as power amplifier nonlinearities
