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approximately asymptotic bandwidth Binary branch demodulator Chapter coding coefficients Communication Systems complex correlation function complex envelope constraint cross section defined denotes determined discussion diversity path Diversity Reception Doppler Doppler shift dr df eigenfunctions eigenvalues energy-to-noise ratio envelope detector equal-strength diversity system Equations equivalent error probability evaluated exceeds explicit diversity expression fading dispersive channel filter Fourier transform frequency dispersive Frequency-Shift Keying Gaussian noise Gaussian noise channel Gaussian random process IEEE IEEE Trans implies impulse response information bit integral intersymbol intersymbol interference IRE Trans lower bound maximization McGraw-Hill modulator waveform moment-generating functions nonnegative obtain optimum demodulator optimum receiver orthogonal output performance probability density Proc random variables range delay ratio per diversity ratio per information Rayleigh Fading received process received waveform right member Ry(t satisfied scattering function sequence Signals statistically independent supposition Theory transmission transmitted waveform two-frequency correlation function upper bound Wiley York zero zero-mean Gaussian random