Title :
Suboptimum coherent detection of direct-sequence multiple-access signals
Author :
Xie, Zhenhua ; Short, Robert T. ; Rushforth, Craig K.
Author_Institution :
Dept. of Electr. Eng., Utah Univ., Salt Lake City, UT, USA
Abstract :
The authors consider 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 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 :
multi-access systems; signal detection; spread spectrum communication; white noise; AWGN channel; additive white Gaussian noise; direct-sequence multiple-access signals; linear transformation; matched filters; mean-squared-error; performance criterion; signal detection; spread spectrum communication; suboptimum coherent detection; suboptimum detectors; tapped delay line; threshold devices; weighted-squared-error; AWGN; Additive white noise; Cities and towns; Computational complexity; Decision feedback equalizers; Delay lines; Detectors; Impedance matching; Intersymbol interference; Matched filters;
Conference_Titel :
Military Communications Conference, 1989. MILCOM '89. Conference Record. Bridging the Gap. Interoperability, Survivability, Security., 1989 IEEE
Conference_Location :
Boston, MA
DOI :
10.1109/MILCOM.1989.103912