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从OFDM信号系统的矩阵表示出发,推导了OFDM系统中盲、半盲以及非盲信道估计方法的CRB,其中,半盲信道估计的CRB是一般的表达式,经过外推可以得到盲信道估计和非盲信道估计的CRB。在推导盲信道估计的CRB时,证明了线性约束和二次约束两种情况下的CRB是一致的。针对OFDM系统的两种不同方案CP-OFDM和ZP-OFDM,分别进行了信道估计的性能仿真,验证了所推导CRB的正确性,并且利用CRB对一些信道估计方法进行了性能评价。
Based on the matrix representation of OFDM signal system, the CRBs of blind, semi-blind and non-blind channel estimation methods in OFDM system are deduced. The CRB of semi-blind channel estimation is a general expression, and extrapolation results in blind channel estimation and CRB for non-blind channel estimation. When deriving the CRB of blind channel estimation, it is proved that the CRBs are the same for both linear and quadratic constraints. For the two different schemes of OFDM system, CP-OFDM and ZP-OFDM, performance simulation of channel estimation is carried out respectively, the correctness of the derived CRB is verified, and the performance of some channel estimation methods is evaluated by CRB.