In wireless channel the noise has a zero mean. This channel property can be used in the enhancement
of the noise performance in the digital receivers by oversampling the received signal and calculating
the decision variable based on the time average of more than one sample of the received signal. The
averaging process will reduce the effect of the noise in the decision variable that will approach to the
desired signal value. The averaging process works like a filter that reduces the noise power at its
output according to its averaging interval. Although the power spectrum of the noise does not change
according to the averaging process, the noise variance at the decision variable will be smaller than
the channel noise variance. This paper studies this idea and show how the performance of digital
receivers can be enhanced by oversampling the received signal. This paper shows another treatment
method to the noise problem in digital modulation systems. |
