Influences of inaccurate estimation of noise variance in sum-product algorithm for DVB-T2 receiver

The low-density parity check decoder in the digital video broadcasting-second generation terrestrial (DVB-T2) receiver usually uses the sum-product algorithm for better bit error performance. However, the algorithm requires estimating noise variance, which is computationally expensive. In this paper, influences of inaccurate estimation of variance are investigated. Based on the simulation results, it is confirmed that a constant SNR may be used in the algorithm with acceptable performance.