A low complexity blind SNR estimator in decoder of high-order modulated LDPC code in mobile communication
Xiaohu You · Journal of Circuits and Systems · 2006
SNR (Signal-to-Noise Ratio) should be estimated in the decoder of LDPC (Low Density Parity Check) code to generate a prior information of the received symbols. In addition, the symbols are often high-order modulated for high spectrum efficiency. In this paper, we study how to estimate SNR from the received symbols that had been high-order modulated, and present a low complexity blind SNR estimator for 8PSK modulated signals, named 8PSKM-BSNRE algorithm. The idea of this algorithm also can be extended for other high-order modulation. Simulation results prove that 8PSKM-BSNRE has good performance when be used in the decoder of LDPC code.