Frequency-hopped Multiple-access Communication Systems Research Articles

Frequency-hopped multiple-access communication with nonorthogonal BFSK in Rayleigh fading channels

Nonorthogonal binary frequency-shift keying is considered in frequency-hopped multiple-access communication systems with Reed-Solomon coding. The effect of tone spacing on the average number of successfully transmitted information bits per unit time per unit bandwidth (called normalized throughput) is examined in Rayleigh fading channels. The tradeoff among tone spacing, code rate, and number of frequency slots in maximizing the normalized throughput is examined, keeping the total bandwidth fixed. The optimal tone spacing, code rate, and number of frequency slots in terms of the number of users and E~/sub b//N/sub 0/ is also discussed. The throughput gain attained by using the optimal tone spacing becomes more significant as the number of users is increased.

Optimal MFSK signalling for Reed-Solomon coded frequency-hopped multiple-access communications

Frequency-hopped multiple-access communication systems employing Reed-Solomon (RS) coded M-ary FSK signalling is considered on a Rayleigh fading channel. The authors examine the optimal modulation alphabet size that maximises the average number of successfully transmitted information bits per dimension in connection with the channel traffic, the signal-to-noise ratio, and the required bit error probability.

Bandwidth tradeoffs among coding, processing gain and modulation in frequency-hopped multiple access communications

The authors investigate the bandwidth tradeoffs among coding, processing gain and modulation in maximising the normalised throughput of frequency-hopped multiple access communication systems having a fixed channel bandwidth. Reed-Solomon coding and FSK modulation are considered in analysing the tradeoffs. A more realistic (but more complicated) model for the error probability given a hit is employed in the analysis. An analysis is presented which accounts for the fact that the side information is imperfect.