Index Assignment Optimization for Digital Communication Systems Using M-ary Modulation Schemes
Tran Ngoc Tuan, Nguyễn Quốc Trung · Research and Development on Information and Communication Technology · 2015
Channel-optimized Index Assignment (IA) of source codewords is a simple but effective approach of improving the error resilience of the communication systems. Although IA is a type of Joint Source Channel Coding (JSCC), it does not intervene with the source codec design. So, in addition to the fact that this method can be used in designing systems effectively, it can be also applied to the existing system. However, these prior IA methods have usually been based on assuming a Binary Symmetric Channel (BSC) and/or single-bit error in the codeword. These assumptions are only valid when the modulation is binary or the noise level in the channel is low. In this paper, we study the IA problem in a more general case in which the modulation is 2Dsignalling M-ary (M-ary PSK, M-ary QAM), proposing the method to optimize IA for this case. Some simulations results based on this method are also given