W. Ma

Arizona State University, Phoenix, Arizona, United States

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Publications (4)0 Total impact

  • W. Ma, P. E. Crouch
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    ABSTRACT: A slow frequency-hopped spread-spectrum multiple access; communication system with M-ary frequency shift keying (MFSK) modulation is studied. A closed-form expression for the symbol error probability of equal-gain diversity reception is obtained. It is assumed that the system operates through a frequency selective slow fading Rayleigh channel coupled with other user interference and additive white Gaussian noise. Numerical results show that the system performance can be significantly improved by means of equal-gain diversity
    Clinical Oncology - CLIN ONCOL-UK. 01/1992;
  • W. Ma, P.E. Crouch
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    ABSTRACT: A study is made of the performance of a fast frequency hopped spread spectrum multiple-access communication system with M -ary frequency-shift keying modulation. The system operates through a frequency-selective slow-fading Rayleigh channel coupled with other-user interference and additive white Gaussian noise. Signals received through multiple antennas are combined by means of selection diversity, namely, the output of the antenna which has a path giving the largest path gain is selected to generate the detection statistics. It is shown that the system performance can thus be improved significantly
    Communications, 1991. ICC '91, Conference Record. IEEE International Conference on; 07/1991
  • W. Ma, P. E. Crouch
    [Show abstract] [Hide abstract]
    ABSTRACT: The symbol error probability of equal-gain diversity reception in a fast frequency hopped spread spectrum multiple-access communication system with M-ary frequency-shift keying modulation is obtained. It is assumed that the system operates through a frequency-selective slow-fading Rayleigh channel coupled with other user interference and additive white Gaussian noise. The effect on the system performance of unequal signal/noise ratios in different diversity channels is investigated. Numerical results show that the system performance can be significantly improved by means of equal-gain diversity
    European Neuropsychopharmacology - EUR NEUROPSYCHOPHARMACOL. 01/1991;
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    ABSTRACT: The use of frequency-domain methods in the simulation of nonlinear feedback systems is investigated. Because of their inherent structure, one is usually forced to implement time-domain simulations by serial techniques that are not capable of effectively exploiting parallel and vector processing capabilities. Frequency-domain techniques are more likely to give rise to vector and matrix operations which are amenable to parallel and vector processing; however, they are generally less efficient in dealing with nonlinearities. An examination is made of some fundamental theoretical issues concerning the frequency-domain simulation of nonlinear feedback systems and of applications to the transient analysis of power distribution models in which the individual generators are modeled by nonlinear feedback systems
    01/1990;

Publication Stats

2 Citations

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Institutions

  • 1991–1992
    • Arizona State University
      • School of Computing, Informatics, and Decision Systems Engineering
      Phoenix, Arizona, United States