Increasing the received signal to noise ratio in SSB radio channels through the use of analytic signal rooting

The method described by M. R. Schroeder et al. (1967) is used to halve the bandwidth of a speech signal. This could result in a doubling of the information carrying capacity of, for example, an SSB radio channel or an increase of 3 dB in the received signal to noise ratio. It is shown that it is possible to realize a "rooting" system using practical linear phase FIR filters with only 20 dB stopband attenuation. The 3 dB gain in output SNR is clearly demonstrated. The subjective SNR may be more than 3 dB due to the "noise shaping" effect of the system