Abstract
The construction of block multidimensional M-PSK modulation codes with unequal error protection (UEP) is considered. An UEP profile for the Rayleigh fading channel is obtained by partitioning fourdimensional constellations that are Cartesian products of non-uniform 8-PSK modulations or are subsets of a product of uniform modulations. New codes are constructed by using the multilevel coding technique with very simple binary component codes. These codes are matched to the vector-sum excited linear predictive (VSELP) codec described in the IS-54 mobile system. .One of the constructed codes has four levels of protection and achieves a coding gain of 16.0 dB (at a SEGSNR of 2.0 dB) in comparison with a system that employs uncoded 4-PSK modulation.
Highlights
1.INTRODUCTIONThe combination of channel coding and modulation (coded modulation) is essential for the design of power and bandwidth efficient digital transmission schemes
The combination of channel coding and modulation is essential for the design of power and bandwidth efficient digital transmission schemes
In this paper we propose new block multidimensional M PSK modulation codes with unequal error protection (UEP) for the Rayleigh fading channel
Summary
The combination of channel coding and modulation (coded modulation) is essential for the design of power and bandwidth efficient digital transmission schemes. Let qi (t) be the reconstructed signal when a single bit error has occurred in position i of every segment. For our constructions we assumed a memoryless channel, achieved through a perfect interleaving, perfect channel state information (CSI), ideal coherent detection and a Gaussian decoding metric. From these assumptions, it can be seen that the pairwise error probability between sequences X and X can be approximated by where P; is the bit error probability in position i,. It can be seen that two levels of protection implies an amount of 50% of important data
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