BER analysis of OFDM based WIMAX using Punctured Convolutional codes
نویسندگان
چکیده
In this paper, simulation model of OFDM based WIMAX system has been developed using punctured convolutional codes. The bit error rate performance of fixedWIMAX has been carried out for different modulation techniques like BPSK, QPSK, and QAM16 with different code rates 1/2, 2/3, 3/4 in each case of modulation technique. Puncturing is the process of deleting some parity bits from the code-word according to a puncturing matrix. Puncturing increases code rate without increasing complexity. The bandwidth efficiency decreases with increase in redundant bits in coding. By removing these redundant bits through puncturing improves the bandwidth efficiency.Puncturing is the trade-off between rate and performance. High-rate punctured codes have been derived from rate 1/2 specific convolutional codes. The performance evaluation is obtained by plotting graphs between BER and Eb/N0 for different modulation techniques and comparing the results for different code rates. Obtained results indicate that the performance of punctured convolutional codes is worse than without puncturing convolutional code but coding scheme improve bandwidth efficiency and reduces the implementation complexity of the Viterbi decoder. Keywords— BER v/s Eb/N0, BPSK, OFDM, Punctured Convolutional Codes, QPSK, QAM16, WIMAX ________________________________________________________________________________________________
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