Title :
An efficient addressing scheme for shaping of multi-dimensional signal constellations using a lookup table
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Abstract :
The paper describes a lookup table for the addressing of an optimally shaped constellation. The method is based on partitioning the subconstellations into shaping macro-shells of integer bit rate and increasing average energy. A lookup table is used to select a subset of the partitions in the cartesian product space. By devising appropriate partitioning/merging rules, the author obtains suboptimum schemes of very low addressing complexity and small performance degradation. The performance is computed using weight distribution of an optimally shaped constellation
Keywords :
computational complexity; encoding; table lookup; telecommunication signalling; addressing scheme; average energy; cartesian product space; ddressing complexity; integer bit rate; lookup table; macro-shells; merging rule; multi-dimensional signal constellations; optimally shaped constellation; partitioning rule; performance degradation; shaping; subconstellations; suboptimum schemes; Bit rate; Constellation diagram; Convolutional codes; Degradation; Distributed computing; Energy measurement; Gain measurement; Lattices; Merging; Table lookup;
Conference_Titel :
Global Telecommunications Conference, 1994. GLOBECOM '94. Communications: The Global Bridge., IEEE
Print_ISBN :
0-7803-1820-X
DOI :
10.1109/GLOCOM.1994.513497
