Title :
On the spectral efficiency of different coherent techniques for frequency comb multiple access systems
Author :
Ali, Mahmoud Ahmed Attia
Author_Institution :
Dept. of Electr. Commun., Fac. of Electron. Eng., Menouf, Egypt
Abstract :
The spreading of M-ary signaling frequency comb multiple access (FCMA) signatures over different radio modulation techniques is investigated. Detection has been carried out coherently for AWGN communication channels including cochannel interference. The dependence of bit error probability on the signal to noise ratio, the number of simultaneous accesses, and the number of frequencies per signature are given as parameters. Coherence detection FCMA among FSK has indicated an improvement of FCMA systems capacity. The different modulation techniques performance is presented and spectral efficiency estimated. New systems results indicated 0.3 b/s/Hz compared to a maximum of 0.22 for the noncoherent M-ary FCMA
Keywords :
AWGN channels; cochannel interference; error statistics; frequency shift keying; multi-access systems; signal detection; spread spectrum communication; telecommunication signalling; AWGN communication channels; FCMA; FSK; M-ary signaling frequency comb multiple access; bit error probability; cochannel interference; coherence detection FCMA; coherent techniques; frequencies per signature; frequency comb multiple access systems; modulation techniques performance; radio modulation techniques; signal to noise ratio; simultaneous accesses; spectral efficiency; spreading; AWGN; Communication channels; Frequency shift keying; Interchannel interference; Multiaccess communication; Multiple access interference; RF signals; Satellites; Signal to noise ratio; Spread spectrum communication;
Conference_Titel :
Radio Science Conference, 1999. NRSC '99. Proceedings of the Sixteenth National
Conference_Location :
Cairo
Print_ISBN :
977-5031-62-1
DOI :
10.1109/NRSC.1999.760891
