Abstract:

A new analysis method which chooses the performance of the irregular modulation mapping schemes in bit interleaved coded modulation with iterative decoding（BICM-ID） system is proposed based on the extrinsic information transfer （EXIT） chart, the difference from EXIT chart analysis method is the proposed method utilizes the corresponding relationship between the extrinsic mutual information and the whole signal to noise ratio region . The simulation results show that the proposed method can effectively choose the different irregular modulation mapping schemes in the different signal to noise ratio region and can roughly evaluate the scope of system bit error rate curve in BICM-ID system.

Key words: extrinsic information transfer chart, irregular modulation mapping, extrinsic mutual information-signal noise ratio chart