some papers1

Selected Publications

1.	MQAM modulation and RS codes for SS-CDMA communication over Rician fading channels Ali, A.A. Communications, IEE Proceedings- Volume: 145 Issue: 6 Dec 1998 Page(s): 414-418 Summary: The use of bandwidth efficient high level modulation systems such as quadrature-amplitude modulation (MQAM) and multiphase (MPSK), together with Reed-Solomon (RS) codes, provides substantial coding gain on fading channels. The author derives the opti.....

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Optimum time diversity for channels subject to pulse-burst interference
Ali, A.A.
Communications, IEE Proceedings-
Volume: 143 Issue: 1 Feb 1996
Page(s): 43-46

Summary: Results of optimum time diversity for Gaussian and Rayleigh fading channels subject to pulse-burst interference of large power and duty-cycle λ are presented. For NC-BFSK and DPSK signals the Chernoff upper bound is used to obtain expressions .....

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Worst-case partial-band noise jamming of Rician fading channels
Ali, A.A.
Communications, IEEE Transactions on
Volume: 44 Issue: 6 Jun 1996
Page(s): 660-662
Digital Object Identifier 10.1109/26.506381

Summary: Analyses of worst-case partial-band noise jamming of binary digital modulation are presented. Both noncoherent detection and differentially coherent detection over slowly varying, frequency-nonselective Rician fading channels are considered. The anal.....

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Optimum hop length for millimetre wave radio links in an arid climate
Ali, A.A.
Microwaves, Antennas and Propagation, IEE Proceedings -
Volume: 142 Issue: 2 Apr 1995
Page(s): 156-162

Summary: Reliability analysis of millimetre-wave radio links operating in an arid climate are presented and used to derive hop length against fade margin charts. Long-term rain and visibility data for Saudi Arabia are used to determine rain and visibility sta.....

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Optimum modulation and diversity for DS-SS communication over Rayleigh fading channels subject to pulse burst interference
Ali, A.A.
Communications, IEE Proceedings-
Volume: 141 Issue: 4 Aug 1994
Page(s): 237-240

Summary: Results of optimum modulation and coding for MPSK and MDPSK signals transmitted over fading channels and subject to high level interference are presented. The author uses the exact expressions of the probability of error for the uncoded M-ary modulat.....

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Optimum modulation and diversity for DS-SS communication over a pulse-burst jammed, Rayleigh fading channels
Ali, A.A.
Global Telecommunications Conference, 1994. GLOBECOM '94. 'Communications: The Global Bridge'., IEEE
Volume: 3 28 Nov- 2 Dec 1994
Page(s): 1727-1737, 1737a-c vol.3
Digital Object Identifier 10.1109/GLOCOM.1994.513170

Summary: Results of optimum modulation and coding for MPSK and MDPSK signals transmitted over faded and jammed channels are presented. Exact expressions of the probability of error for the M-ary modulations on Rayleigh channels subject to pulse-burst jamming .....

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Effect of multipath fading on millimetre wave propagation: a field study
Ali, A.A.; Alhaider, M.A.
Microwaves, Antennas and Propagation, IEE Proceedings H
Volume: 140 Issue: 5 Oct 1993
Page(s): 343-346

Summary: Analysis of clear air fading encountered on millimetric wave and infrared radio links are presented. The analysis is based on data obtained during a four-year field study in the city of Riyadh, Saudi Arabia. The region can be considered as a typical .....

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Optimum hop length for millimeteric wave radio links in arid land climate
Ali, A.A.
Radio Relay Systems, 1993., Fourth European Conference on
11-14 Oct 1993
Page(s): 181-186

Summary: Reliability analysis of millimetric wave radio links operating in an arid climate are presented and used to derive the hop length versus fade margin charts. Long term rain and visibility data for Saudi Arabia, are used to determine rain and visibilit.....

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Millimeter wave propagation in arid land-a field study in Riyadh
Ali, A.A.; Alhaider, M.A.
Antennas and Propagation, IEEE Transactions on
Volume: 40 Issue: 5 May 1992
Page(s): 492-499
Digital Object Identifier 10.1109/8.142623

Summary: A field study on wave propagation has been actively running for four years in Riyadh, Saudi Arabia. The study involves the operation and monitoring of two links at a frequency of 40 GHz, and an infrared link at 0.88-μm wavelength. A meteorological.....

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10.

Experimental studies on millimeterwave and infrared propagation in arid land: the effect of sand storms
Alhaider, M.A.; Ali, A.A.
Antennas and Propagation, 1989. ICAP 89., Sixth International Conference on (Conf. Publ. No.301)
4-7 Apr 1989
Page(s): 268-270 vol.2

Summary: Summarizes the measured sand/dust storm parameters and its effect on the radio links. Nine sand storms were experienced in the city of Riyadh during 1987, and were observed both by the meteorological sensors and by the radio links. The measurements w.....

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11.

Experimental studies on millimeter wave propagation in arid climate: scintillation and multipath fading
Ali, A.A.; Alhaider, M.A.
Antennas and Propagation, 1989. ICAP 89., Sixth International Conference on (Conf. Publ. No.301)
4-7 Apr 1989
Page(s): 428-431 vol.2

Summary: A field study on wave propagation covering a wide range of the electromagnetic spectrum has been actively running for the last four years in the city of Riyadh, Saudi Arabia. The study involves the operation and continuous, computerized, monitoring o.....

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12.

On the use of repetition coding with binary digital modulations on mobile channels
Ali, A.A.; Al-Kadi, I.A.
Vehicular Technology, IEEE Transactions on
Volume: 38 Issue: 1 Feb 1989
Page(s): 14-18
Digital Object Identifier 10.1109/25.31130

Summary: Repetition, diversity, and single-error-correcting codes are examined for use with binary modulation techniques over a mobile communication fading channel. Both bit-error performance and bandwidth efficiency are considered for phase-shift keyed, diff.....

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13.

A comparison of multipath effect of digital modulations for mobile channels
Ali, A.A.; Al-Kadi, I.
Electrotechnics, 1988. Conference Proceedings on Area Communication, EUROCON 88., 8th European Conference on
13-17 Jun 1988
Page(s): 291-294
Digital Object Identifier 10.1109/EURCON.1988.11159

Summary: Binary phase-shift keying (BPSK), quaternary phase-shift-keying (QPSK), and minimum-shift-keying (MSK) are compared for transmission over multipath radio channels. The channel is modeled as a two-ray channel, with the reflected ray attenuated in ampl.....

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14.

Digital modulation and coding for mobile communications
Ali, A.A.
Electrotechnics, 1988. Conference Proceedings on Area Communication, EUROCON 88., 8th European Conference on
13-17 Jun 1988
Page(s): 421-424
Digital Object Identifier 10.1109/EURCON.1988.11191

Summary: M-ary phase shift-keying (MPSK) and M-ary frequency-shift-keying (MFSK) are compared for transmission over a Rayleigh faded radio channel of limited bandwidth. Both diversity and coding improvements are assessed for coupling with th.....

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15.

Airborne Dust Size Analysis for Tropospheric Propagation of Millimetric Waves into Dust Storms
Ahmed, A.S.; Ali, A.A.; Alhaider, M.A.
Geoscience and Remote Sensing, IEEE Transactions on
Volume: GE-25 Issue: 5 Sept. 1987
Page(s): 593-599
Digital Object Identifier 10.1109/TGRS.1987.289838

Summary: This paper presents a study of five dust storms that occured in Riyadh together with their effect on millimeter-wave propagation. Meteorological parameters are given and airborne-dust's permittivity is estimated using relative humidity data. For larg.....

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16.

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17.

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18.

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19.

Necessary bandwidth for high-index FM
Ali, A.A.; Alhaider, M.A.
Proceedings of the IEEE
Volume: 71 Issue: 1 Jan. 1983
Page(s): 184- 186

Summary: Necessary bandwidth for high-index FM with Gaussian modulation is studied. On the basis of the quasi-static argument, a simple formula is devised for calculating the transmission bandwidth. It is shown that the proposed formula is more meaningful th.....

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20.

FM spectrum of video signals
Ali, A.A.
Proceedings of the IEEE
Volume: 70 Issue: 3 March 1982
Page(s): 306- 307

Summary: A simple model for the FM spectrum of color TV signals is presented; based on the assumption that the luminance and chrominance components are uncorrelated Gaussian processes. Unlike existing models of the video FM spectrum, the present model accoun.....

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21.	Authors' Reply to Comments on 'Cost Function Minimization in RC Ladder Networks' Kim, H.; Ali, A. Circuits and Systems, IEEE Transactions on Volume: 24 Issue: 7 Jul 1977 Page(s): 407- 407 Summary: Not available.....

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22.

Cost function minimization in RC ladder networks
Hyong Kim; Ali, A.
Circuits and Systems, IEEE Transactions on
Volume: 23 Issue: 1 Jan 1976
Page(s): 39- 45

Summary: For a canonicRCladder network realized from specified two-port parameters, a proper transformation is applied so as to generate a family of equivalent networks in which the total resistance, total capacitance, and the gain vary continuous.....

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23.	Continuous gain adjustment of RC low-pass ladder networks through congruent transformation Ali, A.; Kim, H. Circuits and Systems, IEEE Transactions on Volume: 22 Issue: 10 Oct 1975 Page(s): 831- 833 Summary: Through a simple congruent transformation, it is shown that the open-circuit voltage gain of a given RC low-pass ladder network can be continuously and exactly adjusted to a desired value within the upper and lower bounds while at the same time keep.....

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