【摘要】 本文讨论了（7,4）汉明码和其它几种纠错码用于1D—DCT信源编码的传输性能,并假设DCT的直流系数是高斯分布,交流系数是拉普拉斯分布。在上述条件下,对不同的平均比特率及不同的信道误码率进行了理论分析,并对“女孩”图象进行了计算机模拟,所得的理论结果和模拟结果比D.Comstock和J.D.Gibson的结果更为吻合。研究还表明:在传输码率相同的条件下,当P_c≥10_-8时,增加信道纠错编码对于恢复图象的质量（SNR）有一定改善;当P_c<10_-4时,增加信道纠错编码不能改善恢复图象的SNR。更多还原

【Abstract】 The transmission performance of the one-dimensional discrete cosine transform (1D-DCT) source/channel coding using (7, 4) Hamming code is discussed. It is assumed that the probability density of DC coefficient in the 1D-DCT is Gaussian, while the probability density of AC coefficient is Laplacian. Under these conditions, theoretical and simulation results with different transmitted data rate and different Pe (probability of Bit Error) are presented. The theoretical results are more conformable to simulation than D. R. comstock & J. D. Gibson. The studies also show that under the same total transmitting data rate channel coding can improve the SNR of the reconstructed image when Pe is greater or equal to 10-3, In the contrary, when Pe is less than 10-4, Channel coding cann’t improve the SNR of the reconstructed image but make SNR decrease.更多还原