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M-NUQAM Modulations with Constant Symbol Mean Energy

Abstract:

Currently with the growth in traffic in wireless networks and with services that require higher speed, the challenge of reaching Shannon’s limit remains a topic of great interest, so that, seeking to increase the capacity BICM of a channel allows the use of better performing channel codes approaching the Shannon limit. The article presents an algorithm proposal to find the positions of the symbols in QAM modulations that maximize capacity, generating the Non Uniform QAM modulations. Additionally, symbol positions are presented to maximize capacity and keep average symbol energy constant. It is validated that this increase in capacity doesn’t affect the bit error rate in an AWGN channel.