Title :
Initial Radius Selection of Sphere Decoder for Practical Applications of MIMO Channels
Author :
Hosseini, Fatemeh Eshagh ; Moghaddam, Shahriar Shirvani
Author_Institution :
Mobile Commun. Co. of Iran, Iran
Abstract :
Sphere Detection (SD) method has been used as a powerful mean to find Maximum Likelihood (ML)solution to the detection problem of Multiple-Input Multiple-Output (MIMO) channels with lower complexity. This method searches closest lattice point inside a sphere. This paper discusses the effect of initial radius of the sphere on the complexity and performance of SD in different noise variances, constellation sizes and number of receive and transmit antennas. According to the discussion, a function is introduced which shows the relation between computational complexity and initial radius. As a result, a useful method for selection of suitable initial radius in practical applications is derived.
Keywords :
MIMO communication; antenna arrays; computational complexity; maximum likelihood decoding; maximum likelihood detection; receiving antennas; transmitting antennas; wireless channels; MIMO channels; computational complexity; constellation sizes; initial radius selection; lattice point; maximum likelihood solution; multiple-input multiple-output channel; noise variance; receive antenna; sphere decoder; sphere detection method; transmit antenna; Covariance matrix; Lattices; MIMO; Maximum likelihood decoding; Maximum likelihood detection; Maximum likelihood estimation; Receiving antennas; Signal processing; Symmetric matrices; Transmitting antennas; Complexity; Initial Radius; Maximum Likelihood (ML); Multiple-Input Multiple-Output (MIMO); Sphere Detection;
Conference_Titel :
Complexity in Engineering, 2010. COMPENG '10.
Conference_Location :
Rome
Print_ISBN :
978-1-4244-5982-7
DOI :
10.1109/COMPENG.2010.15
