摘要
正交频分复用(OFDM)技术是下一代移动通信的核心技术之一。其最突出的优点是频谱利用率高和抗多径时延能力强,适合未来高速宽带无线通信的应用。OFDM技术通过将频率选择性多径衰落信道在频域内转换为平坦信道,减小了多径衰落的影响。根据OFDM基本原理特构建了一个OFDM通信系统仿真模型,分析了在不同调制方式、不同信道下信道编码对系统性能的影响。仿真结果表明,采用信道编码可有效的降低OFDM系统的误码率。
Orthogonal frequency division multiplexing（OFDM）is one of the key technologies for next-generation mobile communications.It has prominent advantages in frequency resource utilization and in nesistance of muliti-path delay,and thus is suitable for high speed and broadband wireless communication.OFDM has been regarded as an efficient approach to combating the adverse multi-path effects by changing frequency-selective channels into flat ones in frequency domain.According to the basic theory of the OFDM technology,an OFDM simulation model is established.The influence of channel coding on the system performance between different modulation modes and different channels is analyzed.The simulation results indicate that,by using channel coding,BER（bit error rate）of the OFDM system could be effectively reduced.
出处
《通信技术》
2010年第11期28-30,共3页
Communications Technology
关键词
正交频分复用
系统仿真
信道编码
误码率
orthogonal frequency division multiplexing
system simulation
channel coding
BER
