Title :
A family of suboptimum detectors for coherent multiuser communications
Author :
Xie, Zhenhua ; Short, Robert T. ; Rushforth, Craig K.
Author_Institution :
Dept. of Electr. Eng., Utah Univ., Salt Lake City, UT, USA
fDate :
5/1/1990 12:00:00 AM
Abstract :
Consideration is given to a class of suboptimum detectors for data transmitted asynchronously by K users employing direct-sequence spread-spectrum multiple access (DS/SSMA) on the additive white Gaussian noise (AWGN) channel. The general structure of these detectors consists of a bank of matched filters, a linear transformation that operates on the matched-filter outputs, and a set of threshold devices. The linear transformations are chosen to minimize either a mean-squared-error or a weighted-squared-error performance criterion. Each detector can be implemented using a tapped delay line. The number of computations performed per detected bit is linear in K in each case, and the resulting detectors are thus much simpler than the optimum detector. Under typical operating conditions, these detectors will perform much better than the conventional receiver and often nearly as well as the optimum detector
Keywords :
code division multiple access; data communication equipment; detector circuits; digital radio systems; radio receivers; signal detection; spread spectrum communication; telecommunication channels; AWGN channel; CDMA; additive white Gaussian noise; asynchronous data transmission; coherent multiuser communications; direct sequence SSMA; filter bank; linear transformation; matched filters; mean-squared-error; performance criterion; spread-spectrum multiple access; suboptimum detectors; tapped delay line; weighted-squared-error; AWGN; Additive white noise; Cities and towns; Delay lines; Detectors; Impedance matching; Intersymbol interference; Matched filters; Maximum likelihood detection; Spread spectrum communication;
Journal_Title :
Selected Areas in Communications, IEEE Journal on