Title :
Optimum multiuser detection for MC-CDMA systems using sphere decoding
Author_Institution :
Telecommun. Lab., Mitsubishi Electr. ITE, Rennes, France
Abstract :
The maximum likelihood joint detection of all users in a multi-carrier code division multiple access (MC-CDMA) system has a prohibitive complexity, growing exponentially with the number of users, when it is performed using an exhaustive search. In this paper, a novel ML multiuser detection algorithm is proposed, whose complexity is a polynomial function of the number of users and is independent of the modulation size. The MC-CDMA system is modelled using a sphere packing lattice representation and an efficient lattice decoder, called the sphere decoder, is applied to jointly detect all users. Simulation results are proposed up to 64 users transmitting 16-QAM symbols
Keywords :
OFDM modulation; code division multiple access; computational complexity; decoding; maximum likelihood detection; multiuser channels; quadrature amplitude modulation; signal detection; 16-QAM symbols; MC-CDMA systems; ML multiuser detection algorithm; OFDM modulation; complexity; lattice decoder; maximum likelihood joint detection; multi-carrier code division multiple access; optimum multiuser detection; polynomial function; sphere decoding; sphere packing lattice representation; Frequency synchronization; Interference; Lattices; Maximum likelihood decoding; Multiaccess communication; Multicarrier code division multiple access; Multipath channels; Multiuser detection; OFDM modulation; Polynomials;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2001 12th IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-7244-1
DOI :
10.1109/PIMRC.2001.965383
