Computer Simulation Results on Frequency Hopped MFSK Mobile Radio - Noiseless Case

This paper considers frequency hopped-multilevel frequency shift keyed (FH-MFSK) spread spectrum communication with possible application to mobile telephone service. Comparisons between randomly chosen address vectors, chirp vectors, and Einarsson's finite field vectors revealed that the latter two were equivalent (as expected) and somewhat better than random coding; however, the difference diminishes as bandwidth increases. Simple FH-MFSK yielded efficiencies around 0.36 bits/s/Hz for bandwidths in the range 3-20 MHz. A checking procedure is also described which, by a closer examination of the structure of the received data, is able to reduce errors markedly. It enables efficiencies around 0.55 bits/s/Hz for bandwidths in the range 3-20 MHz, which is close to that achievable via convolutional coding using dual-
k
codes.