Showing papers on "Fading distribution published in 1974"
TL;DR: A new parameter, duration of stay, is defined which appears to be insensitive to the granular variations of the mean signal strength and would be helpful in the determination of the switching rate in a base station diversity system.
Abstract: It is observed that the estimation of mean signal strength in the mobile radio environment has inherent uncertainties. These may not influence the observed distribution of the mean signal strength but would certainly mask efforts to obtain level crossing rates and duration of fades. A new parameter, duration of stay, is defined which appears to be insensitive to the granular variations of the mean signal strength and would be helpful in the determination of the switching rate in a base station diversity system.
100 citations
TL;DR: It is shown that rate control is superior to power control and that simultaneous power and rate control further improves the performance.
Abstract: A communication system is analyzed in which the transmission power and/or rate are adjusted to the observed state (attenuation) of a slowly fading channel. The optimum control of power and rate with channel attenuation is determined. Some suboptimum control rules are also investigated. The average probability of error is evaluated for various types of adaptive transmission, imposing different constraints on power, rate, and bandwidth. It is shown that rate control is superior to power control and that simultaneous power and rate control further improves the performance. The most effective power and rate control presupposes a high peakpower-average-power ratio and a high peak-rate-peak-rate-average-rate ratio; with no peak power and bandwidth limitation, arbitrary small error probability is attainable for a given power and average rate.
57 citations
TL;DR: It is shown in this paper that bit-error probabilities for some typical digital communication systems can be accurately and efficiently evaluated using the elementary trapezoidal integration rule.
Abstract: It is shown in this paper that bit-error probabilities for some typical digital communication systems can be accurately and efficiently evaluated using the elementary trapezoidal integration rule. Examples involving intersymbol interference and a Rayleigh fading channel are worked.
21 citations
TL;DR: It is shown that an optimum modulation index giving the minimum attainable probability of error for narrowband digital FM is not affected by the effect of fading, carrier-to-noise ratio, or the types and order of diversity.
Abstract: This paper investigates the effects of fading and predetection diversity on the error-rate performance of digital FM discriminator systems. Results are presented in graphs showing the relative improvement of the error rate for several types of diversity, and are compared with the well-known FSK systems. It is also shown that an optimum modulation index giving the minimum attainable probability of error for narrowband digital FM is not affected by the effect of fading, carrier-to-noise ratio, or the types and order of diversity.
7 citations
TL;DR: This correspondence derives an expression for the resultant channel fade probability distribution as a function of up- and down-path fade distributions and the satellite TW input-output (I/O) power transfer characteristic, and demonstrates that power limiting in the satellite has a substantial effect.
Abstract: Evaluating the capacity of a satellite communication system requires accurate prediction of the combined effects of up and down-path fading. This correspondence derives an expression for the resultant channel fade probability distribution as a function of up- and down-path fade distributions and the satellite TW input-output (I/O) power transfer characteristic, and demonstrate that power limiting in the satellite has a substantial effect.
5 citations
TL;DR: The receivers proposed are suboptimal, but realizable, and clearly show the additional complexity due to introduction of delay between the instants of reception and estimation of the signal.
Abstract: This paper reports some results on the development of finite-lag receivers for reception via fading channels. The receivers are given in discrete form and clearly show the additional complexity due to introduction of delay between the instants of reception and estimation of the signal. The channel noise has been assumed to have a multiplicative component due to fading. This results in the optimal demodulators being nonlinear and unrealizable. However, the receivers proposed are suboptimal, but realizable. Simulation studies evaluating the performance of the various receivers are also discussed.
3 citations
TL;DR: The distribution function of the probability of error in the presence of Rayleigh fading and Gaussian noise is determined for the basic binary modulation schemes of coherent frequencyshift keying, noncoherent frequency-shift keying (NCFSK), differential phase-shiftkeying (DPSK), and coherent phase- shifts (CPSK).
Abstract: The distribution function of the probability of error in the presence of Rayleigh fading and Gaussian noise is determined for the basic binary modulation schemes of coherent frequencyshift keying (CFSK), noncoherent frequency-shift keying (NCFSK), differential phase-shift keying (DPSK), and coherent phase-shift keying (CPSK). General expressions for the distribution function of error probability are also derived when linear maximal-ratio diversity combining is employed. Results are given for various values of average error probability and various orders of diversity.
3 citations