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引入了基于线性变换的正交频分复用信道的频域估计方法,通过对接收信号的线性变换达到数据的有效恢复。首先推导了关于推广后旋转矩阵的两个性质定理;然后根据所得的旋转矩阵的性质,给出了导频符号分别基于BPSK和QPSK调制的两种OFDM信道估计算法。在假设信道为瑞利衰落并且在一帧内保持不变的情况下,对基于这两种信道估计算法的系统进行了仿真比较。仿真结果显示,当各子载波的同相信道和正交相位信道同时插入信道估计符号时,OFDM系统的误码率和误包率都可以得到明显的改善。
The method of frequency domain estimation of orthogonal frequency division multiplexing (OFDM) channel based on linear transform is introduced, and the data recovery is achieved by linear transformation of the received signal. Firstly, two properties theorems of generalized rotation matrix are deduced. Based on the properties of the rotation matrix, two kinds of OFDM channel estimation algorithms based on BPSK and QPSK modulation are proposed respectively. The system based on these two channel estimation algorithms was simulated and compared under the assumption that the channel is Rayleigh fading and remains unchanged in one frame. Simulation results show that the BER and packet error rate of OFDM systems can be significantly improved when the channel estimation symbols are inserted into in-phase channels and quadrature phase channels of each sub-carrier at the same time.