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  • CCS

    Introduction of Binary Signal Transmission

    In a binary communication system, binary data consisting of a sequence of O's and
    l's are transmitted by means of two signal waveforms, say, So(t) and S1 (t). Suppose
    that the data rate is specified as R bits per second. Then each bit is mapped into a
    corresponding signal waveform according to the rule,

     

    where Tb = 1 / R is defined as the bit time interval. We assume that the data bits 0
    and 1 are equally probable-that is, each occurs with probability 1/2 - and are mutually
    statistically independent.

    The channel through which the signal is transmitted is assumed to corrupt the signal
    by the addition of noise, denoted as n ( t), which is a sample function of a white
    Gaussian process with power spectrum No/2 watts/hertz. Such a channel is called an
    additive white Gaussian noise (AWGN) channel. Consequently, the received signal
    waveform is expressed as,

    The task of the receiver is to determine whether a 0 or a 1 was transmitted after
    observing the received signal r(t) in the interval 0 <= t <= Tb. The receiver is designed
    to minimize the probability of error. Such a receiver is called the optimum receiver.

    Reference,

      1. <<Contemporary Communication System using MATLAB>> - John G. Proakis

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  • 原文地址:https://www.cnblogs.com/zzyzz/p/13618140.html
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