摘要
针对偏移正交幅度调制的正交频分复用(OQAM/OFDM)系统中成对训练序列(POP)法信道估计技术性能较差且受噪声影响较大的问题,提出了一种基于压缩感知(CS)的POP信道估计方法。该方法将压缩感知技术应用于POP法信道估计之中,将传统的频域信道估计方法转化为时域信道估计方法,通过压缩感知技术准确地重构出时域信道信息,减少导频开销,提高频谱利用率,得到更好的信道估计性能。与传统的OQAM/OFDM系统的信道估计方法进行比较,仿真结果表明,所提的方法能够在使用较少的导频符号的同时得到更高的系统性能和信道估计精度。
In OQAM/OFDM system, the pair of pilot channel estimation method has a bad channel estimation performance and easily influenced by noise, to solve this problem, pairs of real pilots(POP) channel estimation method based on compressed sensing(CS) is proposed. This method applies the CS technique to the POP channel estimation method, which transforms the conventional frequency domain channel estimation method into the time domain channel estimation. Through the compressed sensing technique reconstructing the time domain channel information, the pilots expense is reducted, spectral efficiency is improved and a highly accuracy channel estimation is obtained. Comparing with the traditional channel estimation method in OQAM/OFDM system,the simulation results validate that the new method can get a superior performance and higher channel estimation accuracy while using fewer pilot symbols.
出处
《测控技术》
CSCD
2017年第12期33-38,共6页
Measurement & Control Technology
基金
国家自然科学基金资助项目(61671468)
