摘要
OFDM因能有效对抗频率选择性衰落和窄带干扰,成为802.11无线通信的物理层标准。论文使用不同的编码效率的卷积码,对OFDM系统的抗干扰能力进行仿真,得到对应的信噪比与误码率的关系,并数值分析了编码效率与编码增益之间的折中关系。结果表明,编码效率的损失,则能带来误码率的改善。在语音通信误码率的一般要求下,损失1/3的编码效率可以增加的编码增益,约为3 dB。
OFDM has become the physical layer standard of wireless communication based on 802.11 due to its efficient capability of resisting frequency-selective fading and narrow band interference. The afore mentioned performances of OFDM system can be efficiently developed only under the condition of combing with channel coding. Using convolution codes with different coding efficiency, a OFDM systen＇s ability of anti-interference is simulated and the corresponding relations of BER versus SNR are obtained. The trade-off between efficiency and gain of convolution coding is analyzed numerically. The result indicates that BER can be improved at the cost of loss of coding efficiency. Loss of 1/3 coding efficiency results in 3dB increment of coding gain approximately under the requirement of BER in vocal communication.
出处
《信息化研究》
2011年第4期38-41,共4页
INFORMATIZATION RESEARCH
关键词
正交频分复用
卷积码
误码率
orthogonal frequency division multiplexing
convolution code, bit error rate
