Abstract：The effects of both symbol synchronization error and SNR estimation on the LDPC decoding performance are investigated. Based on the statistical properties of the LDPC decoding output value, a joint timing recovery and SNR estimation algorithm is given, which puts the symbol synchronization, SNR estimation and iterative decoding together by two cooperative loops. After several iterative steps, the estimated values of symbol synchronization error and SNR convergent rapidly, and little performance degradation is observed than the system with foregone SNR and accurate symbol timing.
2008, Vol. 30 
