A BICM-Based CC Scheme with High Efficiency and Its Performance Analysis
Nan Zhang · Dianzi xuebao · 2010
A high-efficient coded cooperative scheme based on bit-interleaved coded modulation is proposed.Encoded bits of the cooperative user are partitioned into two frames,bit interleaved,mapped and then transmitted on the allocated time slots respectively.Bit interleaver is utilized to satisfy the fading coefficients of the different bits of a same symbol cound be modeled as i.i.d variables.One hand,the pairwire error probability over various fading channels is derived,and an upper-bound on bit-error probability is presented.Both theory analysis and simulations show that the BICM CC with high-order constellations can also achieve the full diversity under quai-static Rayleigh fading channels,whereas no any cooperation diversity over fast fading channels.On the other hand,labeling maps and interleavers are studied.It can be concluded that GRAY labeling is still optimum for the cooperative users and different interleavers of two frames can improve the performance.