Title :
Performance comparison of MFSK frequency-hopped multiple access systems with RTT decision over a Rayleigh fading channel
Author :
Su, Ing-Jiunn ; Wu, Jingshown
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
The effectiveness of erasure side information generated by Viterbi´s ratio threshold test (RTT) decision for frequency-hopped multiple access (FHMA) systems with M-ary frequency shift keying (MFSK) is studied. The performances for M up to 16 are presented. The signaling for M=4 is revealed to be the best choice under any circumstances over the Rayleigh fading channel. Compared with binary frequency shift keying (BFSK), the signaling for M=4 can offer 30% and 45% performance gains in achievable maximum capacity for the synchronous and asynchronous hopping systems with hard decision in the receiver, respectively. With RTT decision, the performance of BFSK systems is improved significantly and the performance gap between the signaling for M=4 and M=2 can be reduced to 25% in asynchronous hopping systems. The effect of modulation bandwidth expansion, the variation of signal-to-noise ratio in modulation symbol, and different nature in hit period for both hopping types are discussed
Keywords :
Rayleigh channels; Viterbi detection; frequency hop communication; frequency shift keying; multi-access systems; multipath channels; multiuser channels; radio receivers; spread spectrum communication; BFSK; FHMA systems; M-ary frequency shift keying; MFSK frequency-hopped multiple access systems; RTT decision; Rayleigh fading channel; SNR variation; SSMA; Viterbi ratio threshold test; achievable maximum capacity; asynchronous hopping system; binary frequency shift keying; erasure side information; hard decision; hit period; modulation bandwidth expansion; modulation symbol; multipath signals; performance; performance gain; receiver; signal-to-noise ratio; signaling; synchronous hopping system; Bandwidth; Fading; Frequency shift keying; Frequency synthesizers; Pattern analysis; Signal analysis; Signal to noise ratio; System performance; System testing; Wireless communication;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.775916
