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PERFORMANCE ANALYSIS OF LOW DENSITY PARITY-CHECK CODES (LDPC) IN WIMAX OFDM SYSTEM

Mohit Lakra, Rajiv Dahiya, Shaloo Kikan

In this paper, we designed an 802.16e-(WiMAX) wireless environment to analyze the performance of low density parity-check codes (LDPC). Low-density parity-check (LDPC) codes can be considered serious competitors to turbo codes, convolutional code (CC) and read Solomon (RS) in terms of performance and complexity. The OFDM technique is an interesting approach in mobile communications in order to achieve a high spectral efficiency. From last few decades wireless communications industry is gaining momentum in both fixed and mobile applications. The continued increase in demand for all types of wireless services (voice, data, and multimedia) is fueling the need for higher capacity and data rates not only in fixed but also in mobile applications. There are many techniques that fulfill these requirements. One of the most important techniques is Orthogonal Frequency Division Multiplexing (OFDM). The Stanford University Interim (SUI-3) channel models are selected for the wireless channel in the simulation. Perfect channel estimation is assumed. In this paper, the performance analysis based on bit error rate (BER) versus bit energy to noise rate (Eb/No) plots and spectral efficiency of different modulation and channel coding schemes according to the standard IEEE 802.16.