摘要
针对传统的单载波频域均衡系统(SC-FDE)在信道变化迅速、多普勒频移大的复杂多径信道下误码率较高、可靠性较差等问题,分别研究了基于LDPC编码和基于Turbo编码的SC-FDE系统,并在不同的航空莱斯信道下,分别对基于两种不同编码技术的SC-FDE系统进行了系统建模,同时对其系统信噪比和误码率曲线进行了Matlab仿真。仿真研究结果表明:应用编码技术的SC-FDE系统的误码率明显地降低;基于LDPC编码的SC-FDE系统,在地空信道下输入信噪比为14 dB时可以达到接近10-6的误码率;与基于Turbo编码的SC-FDE系统相比,基于LDPC编码的SC-FDE系统在地空信道下误码率为10-3时有1 dB的编码增益,且没有误差平底现象,可以有效地提高信息传输的可靠性;该系统更适合未来高速、高效通信的要求。
Aiming at the high bit error rate （BER）and unreliability of traditional single carrier frequency domain equalization （SC-FDE） in complex multipath environment, where the channel is changing rapidly and Doppler frequency shift is large, SC-FDE system based on LDPC and Turbo code were studied and their modeling were bulit respectively. Under the air Ricean channel, the curve of systemic signal-to-noise ratio with the bit-error-ratio was simulated by Matlab. The simulation results indicate that the BER of SC-FDE system with code technique has dramaticlly reduced. When the input of SNR is 14dB, the BER of SC-FDE system based on LDPC is closed to. In ground to air channel, compared with the SC-FDE system based on Turbo code, the SC-FDE system based on LDPC code achieves 1 dB coding gain and does not have error-floors when BER is about. Therefore the SC-FDE system based on code technique can enhance the reliability of the information transmission, to meet requirements of high speed and efficient of future communication.
出处
《机电工程》
CAS
2012年第5期609-612,共4页
Journal of Mechanical & Electrical Engineering
关键词
单载波频域均衡
LDPC编码
TURBO编码
误码率
莱斯信道
single carrier frequency domain equalization（SC-FDE）
LDPC code
Turbo code
bit error rate（BER）
Ricean channel
