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
多进制频移键控正交频分复用(orthogonal frequency division multiplexing multiple frequency shift keying,OFDM-MFSK)调制能抵抗水声信道中的多径衰落和多普勒效应,且无需复杂的信道估计与均衡,适合低成本的水声通信机设计。针对OFD...多进制频移键控正交频分复用(orthogonal frequency division multiplexing multiple frequency shift keying,OFDM-MFSK)调制能抵抗水声信道中的多径衰落和多普勒效应,且无需复杂的信道估计与均衡,适合低成本的水声通信机设计。针对OFDM-MFSK水声通信系统,提出了一种差错控制编码方法,具体思想为在使用OFDM-MFSK传输原数据的同时调制子载波的相位以传输另一路编码,接收端结合两种解调方式,利用编码的差错图样与校验码实现数据的纠错。相比于其他前向纠错编码,此种差错控制方法的码长短、编解码复杂度低,结合OFDM-MFSK调制,能在保证通信可靠性和实时性的同时降低水声通信系统的实现成本,适用于低速率水声通信系统的设计。展开更多
提出了一种用于100 G以太网无源光网络(Ethernet Passive Optical Network,EPON)通信系统的里德-所罗门(Reed-Solomon,RS)编码器设计方法。100 G EPON通信系统由4个25 G EPON通信子系统组成,针对每一路25 G通信系统,采用纠错能力强、可...提出了一种用于100 G以太网无源光网络(Ethernet Passive Optical Network,EPON)通信系统的里德-所罗门(Reed-Solomon,RS)编码器设计方法。100 G EPON通信系统由4个25 G EPON通信子系统组成,针对每一路25 G通信系统,采用纠错能力强、可靠性高的RS(1023,847)码组作为编码器的码型。根据编码器码组类型等参数,以及输入数据更新周期与位宽等特性,计算出编码电路的并行度。利用多路切换技术、数据并行化计算等高速设计技术,提出了一种可用于单通道的高速RS(1023,847)编码器设计方案。实际组网测试结果表明,设计的单通道RS(1023,847)编码器最高数据吞吐率可达25 Gbit/s,电路的最高时钟频率可达390.625 MHz,4路单通道编码器可实现最高数据吞吐率100 Gbit/s的RS编码,能够满足100 G EPON系统要求。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.
文摘多进制频移键控正交频分复用(orthogonal frequency division multiplexing multiple frequency shift keying,OFDM-MFSK)调制能抵抗水声信道中的多径衰落和多普勒效应,且无需复杂的信道估计与均衡,适合低成本的水声通信机设计。针对OFDM-MFSK水声通信系统,提出了一种差错控制编码方法,具体思想为在使用OFDM-MFSK传输原数据的同时调制子载波的相位以传输另一路编码,接收端结合两种解调方式,利用编码的差错图样与校验码实现数据的纠错。相比于其他前向纠错编码,此种差错控制方法的码长短、编解码复杂度低,结合OFDM-MFSK调制,能在保证通信可靠性和实时性的同时降低水声通信系统的实现成本,适用于低速率水声通信系统的设计。
文摘提出了一种用于100 G以太网无源光网络(Ethernet Passive Optical Network,EPON)通信系统的里德-所罗门(Reed-Solomon,RS)编码器设计方法。100 G EPON通信系统由4个25 G EPON通信子系统组成,针对每一路25 G通信系统,采用纠错能力强、可靠性高的RS(1023,847)码组作为编码器的码型。根据编码器码组类型等参数,以及输入数据更新周期与位宽等特性,计算出编码电路的并行度。利用多路切换技术、数据并行化计算等高速设计技术,提出了一种可用于单通道的高速RS(1023,847)编码器设计方案。实际组网测试结果表明,设计的单通道RS(1023,847)编码器最高数据吞吐率可达25 Gbit/s,电路的最高时钟频率可达390.625 MHz,4路单通道编码器可实现最高数据吞吐率100 Gbit/s的RS编码,能够满足100 G EPON系统要求。
