This work investigates the performance of various forward error correction codes, by which the MIMO-OFDM system is deployed. To ensure fair investigation, the performance of four modulations, namely, binary phase shif...This work investigates the performance of various forward error correction codes, by which the MIMO-OFDM system is deployed. To ensure fair investigation, the performance of four modulations, namely, binary phase shift keying(BPSK), quadrature phase shift keying(QPSK), quadrature amplitude modulation(QAM)-16 and QAM-64 with four error correction codes(convolutional code(CC), Reed-Solomon code(RSC)+CC, low density parity check(LDPC)+CC, Turbo+CC) is studied under three channel models(additive white Guassian noise(AWGN), Rayleigh, Rician) and three different antenna configurations(2×2, 2×4, 4×4). The bit error rate(BER) and the peak signal to noise ratio(PSNR) are taken as the measures of performance. The binary data and the color image data are transmitted and the graphs are plotted for various modulations with different channels and error correction codes. Analysis on the performance measures confirm that the Turbo + CC code in 4×4 configurations exhibits better performance.展开更多
为了在信道带宽受限的情况下保证视频效果,提出一种适用于无线网络中视频广播通信的应用层前向纠错方案,该方案根据不同的视频符号对接收端重建视频质量的贡献为其分配不同的优先级,充分利用了视频数据的不等重要性的特点.在系统信道带...为了在信道带宽受限的情况下保证视频效果,提出一种适用于无线网络中视频广播通信的应用层前向纠错方案,该方案根据不同的视频符号对接收端重建视频质量的贡献为其分配不同的优先级,充分利用了视频数据的不等重要性的特点.在系统信道带宽有限的情况下,综合考虑了不同终端的信道状况,通过牺牲少部分低丢包率终端的视频质量为代价,获得了小区内所有用户总体接收视频质量显著提高.仿真实验结果表明:与等差错保护方案和扩展窗不等差错保护方案相比,本文提出方案的用户平均接收视频质量高2~5 d B.展开更多
文摘This work investigates the performance of various forward error correction codes, by which the MIMO-OFDM system is deployed. To ensure fair investigation, the performance of four modulations, namely, binary phase shift keying(BPSK), quadrature phase shift keying(QPSK), quadrature amplitude modulation(QAM)-16 and QAM-64 with four error correction codes(convolutional code(CC), Reed-Solomon code(RSC)+CC, low density parity check(LDPC)+CC, Turbo+CC) is studied under three channel models(additive white Guassian noise(AWGN), Rayleigh, Rician) and three different antenna configurations(2×2, 2×4, 4×4). The bit error rate(BER) and the peak signal to noise ratio(PSNR) are taken as the measures of performance. The binary data and the color image data are transmitted and the graphs are plotted for various modulations with different channels and error correction codes. Analysis on the performance measures confirm that the Turbo + CC code in 4×4 configurations exhibits better performance.
文摘为了在信道带宽受限的情况下保证视频效果,提出一种适用于无线网络中视频广播通信的应用层前向纠错方案,该方案根据不同的视频符号对接收端重建视频质量的贡献为其分配不同的优先级,充分利用了视频数据的不等重要性的特点.在系统信道带宽有限的情况下,综合考虑了不同终端的信道状况,通过牺牲少部分低丢包率终端的视频质量为代价,获得了小区内所有用户总体接收视频质量显著提高.仿真实验结果表明:与等差错保护方案和扩展窗不等差错保护方案相比,本文提出方案的用户平均接收视频质量高2~5 d B.
