Semi-Blind Channel Estimation for Single-Carrier With Frequency-Domain Equalization Systems in the Presence of Colored Noise : A Cyclic Zero Insertion Approach

In this paper, we propose a semi-blind channel estimation method for single-carrier with frequency-domain equalization (SC-FDE) systems in the presence of colored noise. The method introduces a cyclic zero insertion approach where a single zero is periodically inserted into the transmitted sequence. This way induces a special structure of the autocorrelation matrix of the received signal, enabling effective channel estimation even in environments with colored noise. By extracting the channel product coefficients from the autocorrelation matrix, we construct a Hermitian matrix whose dominant eigenvector corresponds to the channel impulse response. Simulation results demonstrate the effectiveness of the proposed method.