OFDM系统中基于DCT的RLS信道估计

DCT-Based RLS Channel Estimation for OFDM Systems

提出了一种适用于正交频分复用系统信道估计的基于离散余弦变换的RLS方法,并给出了相应的算法.该方法用离散余弦变换代替传统的RLS算法中的DFT变换,能有效降低信道冲激响应泄漏引起的混叠误差.仿真结果表明该方法的性能比传统的RLS算法好,系统误符号率和均方误差都有明显的改善.

A DCT-based RLS （DCT-RLS） channel estimation method is proposed for orthogonal frequency division multiplexing （OFDM） system, and the corresponding algorithm is presented. This method can effectively eliminate the aliasing error caused by channel impulse response （CIR） leakage since discrete cosine transform （DCT） is used instead of DFT transform. Simulation results indicate the proposed channel estimation method outperforms the conventional RLS method, and both system symbol error rate （SER） and mean square error （MSE） are obviously decreased.