Title :
A low complexity threshold detector making MLSD decisions in a multiuser environment
Author :
Nilsson, Rickard ; Sjöberg, Frank ; Edfors, Ove ; ödling, Per ; Eriksson, Håkan ; Wilson, Sarah Kate ; Börjesson, Per Ola
Author_Institution :
Div. of Signal Process., Lulea Univ. of Technol., Sweden
Abstract :
We present a pipelined implementation of an iterative threshold detector, which makes the same decisions as a maximum likelihood sequence detector (MLSD) on some, but not necessarily all, bits. We apply this as a first stage detector in a direct sequence code division multiple access (DS-CDMA) interference-limited multiuser system. In combination with the single-user matched filter (MF) detector we obtain improved performance and lower complexity than with the decorrelating receiver for a limited number of simultaneous users, e.g. up to 25 users with a spreading factor of 127
Keywords :
code division multiple access; computational complexity; filtering theory; matched filters; maximum likelihood detection; pipeline processing; pseudonoise codes; radiofrequency interference; spread spectrum communication; DS-CDMA; MLSD decisions; decorrelating receiver; direct sequence code division multiple access; interference-limited multiuser system; iterative threshold detector; low complexity threshold detector; maximum likelihood sequence detector; multiuser environment; performance; pipelined implementation; single-user matched filter detector; spreading factor; Bit error rate; Covariance matrix; Decorrelation; Detection algorithms; Detectors; Direct-sequence code-division multiple access; Interference cancellation; Matched filters; Maximum likelihood detection; Multiaccess communication;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686590
