Title :
Performance of an S-CDMA system with noncoherent spread-spectrum MSK modems
Author :
Khachatrian, Gurgen H. ; Kovakimyan, K.S. ; Nikogossyan, Karen M. ; Vartapetyan, Armen L.
Author_Institution :
Inst. of Problems of Inf. & Autom., Armenian Acad. of Sci., Armenia
fDate :
5/1/1998 12:00:00 AM
Abstract :
Simplified noncoherent and differentially coherent spread-spectrum (SS) minimum shift keying (MSK) receiver structures are presented. It is shown that an optimal noncoherent SS receiver for pure (with rectangular baseband pulses) offset QPSK signals can serve as a suboptimal (performance loss ≃0.9 dB) noncoherent receiver for SS MSK signals. The conditions of orthogonality of SS MSK signals are derived in synchronous and quasi-synchronous code-division multiple-access (CDMA) systems. Computer simulation results evaluate the performance of the CDMA system with suggested receivers under certain conditions
Keywords :
code division multiple access; minimum shift keying; modems; quadrature phase shift keying; receivers; spread spectrum communication; 0.9 dB; CDMA; S-CDMA system; SS MSK signal; differentially coherent spread-spectrum minimum shift keying receiver; noncoherent spread-spectrum MSK modems; noncoherent spread-spectrum minimum shift keying receiver; offset QPSK signals; optimal noncoherent SS receiver; orthogonality; performance; quasi-synchronous code-division multiple-access; rectangular baseband pulses; suboptimal noncoherent receiver; synchronous code-division multiple-access; AWGN; Baseband; Bit error rate; Computer simulation; Modems; Multiaccess communication; Performance loss; Phase modulation; Quadrature phase shift keying; Spread spectrum communication;
Journal_Title :
Vehicular Technology, IEEE Transactions on
