摘要
利用频率分集可以有效地改善符号检测性能,而传统的正交频分复用(OFDM)系统中没有实现频率分集增益。针对频率选择性信道设计块扩展OFDM系统,在发端对信息块进行扩展变换,并给出了基于最小二乘(least squares,LS)收端的信道估计和基于最小均方误差(minimum mean squares error,MMSE)的符号检测方案。仿真结果验证了信道估计与符号检测方案的有效性,表明扩展变换有效地提高OFDM系统的符号检测性能。
Frequency diversity can be exploited for performance improvement of symbol detection. However, there is no frequency diversity gain in traditional OFDM system. Therefore, a block spread OFDM system was designed for the frequency selective fading channel, in which a spread transform on the information block was performed at the transmitter. Moreover, a least squares （LS） based channel estimation and minimum mean squares error （MMSE） based symbol detection scheme were proposed for the receiver. Simulation results corroborate the validity of the channel estimation and symbol detection scheme, and the symbol detection performance is effectively improved by the spread transform.
出处
《中国电力》
CSCD
北大核心
2014年第12期117-120,126,共5页
Electric Power
关键词
正交频分复用
扩展变换
频率选择性信道
信道估计
符号检测
orthogonal frequency division multiplexing （OFDM）
spread transform
frequency selective channel
channel estimation
symbol detection
