OFDM transceiver for software defined radio on a model based development platform

Orthogonal Frequency Division Multiplexing (OFDM) is an efficient multiplexing technique which is being used in many wireless communication systems. This paper describes a simple OFDM transceiver where the QPSK mapping / demapping is used and an 8-point complex IDFT/DFT blocks used for Software Defined Radio (SDR). The whole system is designed, developed and tested on a model based development platform on which design, development and testing saves considerable amount of time compared to traditional design method.

I. Introduction

Orthogonal Frequency Division Multiplexing (OFDM) is extensively used in wireless communication systems due to its resistance to Inter Symbol Interference (ISI) caused by dispersive channel [1]. OFDM has been considered strong candidate for the next generation high-data-rate wireless communication systems because of its good Bit Error Rate (BER) performance and high spectrum efficiency. In a multicarrier technology such as OFDM, it is crucial to maintain orthogonality among all the subcarriers to prevent the Inter Carrier Interference (ICI) which if not done leads to significant performance degradation. In a high mobility environment, such as aerial vehicle communication, muticarrier transmission leads to severe ICI due to Doppler shift [2].