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Research paper thumbnail of On the capacity of DS-CDMA systems in a Nakagami multipath channel

MILCOM 92 Conference Record

Abstract The coherence reception of direct-sequence/code-division multiple-access (DS/CDMA) signa... more Abstract The coherence reception of direct-sequence/code-division multiple-access (DS/CDMA) signals in a multipath fading channel is considered. The channel model assumes independent paths with Nakagami fading statistics; this model includes the ...

Research paper thumbnail of Coherent DS-CDMA performance in Nakagami multipath fading

IEEE Transactions on Communications, 1995

The coherent reception of direct sequencecode division multiple access (DS-CDMA) signals in a mul... more The coherent reception of direct sequencecode division multiple access (DS-CDMA) signals in a multipath fading channel is considered. The channel model assumes independent paths with Nakagami fading statlstks; this model includes the Rayleigh channel as a specid case and io a reasonable model for a frequency-selective fading channel. The bit error rate (BER) performance of a RAKE receiver under varlous multipath fading conditions is derived and evaluated. The results indicate that over 50 users may access the c l r a n d (crssuming 127 chips per bit) simdtaneously under typical fading coaditbns, and can achieve an uncoded BER d 0.01 with an average received signal-to-noise ratio per bit of 10 dB. (SNR), thus bypassing a detailed analysis based on a specific fading statistic. Similarly, Lehnert and Pursley [51 analyzed SNR performance for a multipath-combining receiver and tipath mitigation. This paper was m o v e d by James S. Lehnert, the Editor for Modulation Br Signal Design of the IEEE Communiutioas Society. Manuscript received: 1119192; revised; 12/27/93; 9/19/94. This work was pesented in put It the IEEE MILCOM Conference, October 11,1992. This wark wiw pertidly supported by the Army Research Office under Grant DAAu)3-91-G-0071, by the Office of Naval Research under Grant NOOO14-91-J-1234, and by the National Science Foundation under Grant 'I~OIIMS Eng, Department of Electrical and Computer Engineering, Laurence B. Milstein, Deputment of Electrical and Computer Engineer-IEEE Log Number 9410908.

Research paper thumbnail of Capacities of FDMA/CDMA systems in the presence of phase noise and multipath Rayleigh fading

IEEE Transactions on Communications, 1998

The effect of phase noise on the capacities of coherently demodulated hybrid frequency-division m... more The effect of phase noise on the capacities of coherently demodulated hybrid frequency-division multiple access/code division multiple-access (FDMA/CDMA) systems operating over a multipath Rayleigh-fading channel is investigated. Using an approximate upper bound on the bit-error rate performance, which has been derived and presented in a previous paper, the capacities of the FDMA/CDMA systems are estimated for several combinations of channel and system parameters. Simulation results are also included to show the effect of the bounding error.

Research paper thumbnail of Comparison of diversity combining techniques for Rayleigh-fading channels

IEEE Transactions on Communications, 1996

Several methods of diversity combining for a Rayleigh-faded channel are evaluated and compared. T... more Several methods of diversity combining for a Rayleigh-faded channel are evaluated and compared. The methods considered are, for coherent reception, maximal ratio combining (MRC), selection combining (SC), and a generalization of SC, whereby the two (three) signals with the two (three) largest amplitudes are coherently combined. We will call this method second (third) order SC, and denote it SC2 (SC3).

Research paper thumbnail of Correction to "Comparison of diversity combining techniques for Rayleigh-fading channels

IEEE Transactions on Communications, 1998

Research paper thumbnail of Comparison of hybrid FDMA/CDMA systems in frequency selective Rayleigh fading

IEEE Journal on Selected Areas in Communications, 1994

Research paper thumbnail of On the capacity of DS-CDMA systems in a Nakagami multipath channel

MILCOM 92 Conference Record

Abstract The coherence reception of direct-sequence/code-division multiple-access (DS/CDMA) signa... more Abstract The coherence reception of direct-sequence/code-division multiple-access (DS/CDMA) signals in a multipath fading channel is considered. The channel model assumes independent paths with Nakagami fading statistics; this model includes the ...

Research paper thumbnail of Coherent DS-CDMA performance in Nakagami multipath fading

IEEE Transactions on Communications, 1995

The coherent reception of direct sequencecode division multiple access (DS-CDMA) signals in a mul... more The coherent reception of direct sequencecode division multiple access (DS-CDMA) signals in a multipath fading channel is considered. The channel model assumes independent paths with Nakagami fading statlstks; this model includes the Rayleigh channel as a specid case and io a reasonable model for a frequency-selective fading channel. The bit error rate (BER) performance of a RAKE receiver under varlous multipath fading conditions is derived and evaluated. The results indicate that over 50 users may access the c l r a n d (crssuming 127 chips per bit) simdtaneously under typical fading coaditbns, and can achieve an uncoded BER d 0.01 with an average received signal-to-noise ratio per bit of 10 dB. (SNR), thus bypassing a detailed analysis based on a specific fading statistic. Similarly, Lehnert and Pursley [51 analyzed SNR performance for a multipath-combining receiver and tipath mitigation. This paper was m o v e d by James S. Lehnert, the Editor for Modulation Br Signal Design of the IEEE Communiutioas Society. Manuscript received: 1119192; revised; 12/27/93; 9/19/94. This work was pesented in put It the IEEE MILCOM Conference, October 11,1992. This wark wiw pertidly supported by the Army Research Office under Grant DAAu)3-91-G-0071, by the Office of Naval Research under Grant NOOO14-91-J-1234, and by the National Science Foundation under Grant 'I~OIIMS Eng, Department of Electrical and Computer Engineering, Laurence B. Milstein, Deputment of Electrical and Computer Engineer-IEEE Log Number 9410908.

Research paper thumbnail of Capacities of FDMA/CDMA systems in the presence of phase noise and multipath Rayleigh fading

IEEE Transactions on Communications, 1998

The effect of phase noise on the capacities of coherently demodulated hybrid frequency-division m... more The effect of phase noise on the capacities of coherently demodulated hybrid frequency-division multiple access/code division multiple-access (FDMA/CDMA) systems operating over a multipath Rayleigh-fading channel is investigated. Using an approximate upper bound on the bit-error rate performance, which has been derived and presented in a previous paper, the capacities of the FDMA/CDMA systems are estimated for several combinations of channel and system parameters. Simulation results are also included to show the effect of the bounding error.

Research paper thumbnail of Comparison of diversity combining techniques for Rayleigh-fading channels

IEEE Transactions on Communications, 1996

Several methods of diversity combining for a Rayleigh-faded channel are evaluated and compared. T... more Several methods of diversity combining for a Rayleigh-faded channel are evaluated and compared. The methods considered are, for coherent reception, maximal ratio combining (MRC), selection combining (SC), and a generalization of SC, whereby the two (three) signals with the two (three) largest amplitudes are coherently combined. We will call this method second (third) order SC, and denote it SC2 (SC3).

Research paper thumbnail of Correction to "Comparison of diversity combining techniques for Rayleigh-fading channels

IEEE Transactions on Communications, 1998

Research paper thumbnail of Comparison of hybrid FDMA/CDMA systems in frequency selective Rayleigh fading

IEEE Journal on Selected Areas in Communications, 1994

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