Digital Radio Outage Due to Selective Fading-Observation vs Prediction From Laboratory Simulation

Lundgren, C. W.; Rummler, W. D.

doi:10.1002/j.1538-7305.1979.tb03336.x

Cited by 65 publications

(4 citation statements)

References 3 publications

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“…A companion paper describes the laboratory test and the required calculations. 8 Future work will be directed toward verifying the model and model statistics with additional fading data obtained both at 6 GHz and at 4 GHz. Using coherent data obtained in 1973, it will be possible to determine the extent to which the channel is actually a minimum phase channel.…”

Section: Maximum Error In Each F It In Decibelsmentioning

confidence: 98%

A New Selective Fading Model: Application to Propagation Data

Rummler¹

1979

Bell System Technical Journal

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235

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Section: Maximum Error In Each F It In Decibelsmentioning

confidence: 98%

A New Selective Fading Model: Application to Propagation Data

Rummler¹

1979

Bell System Technical Journal

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235

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“…Taking the variable transformation in eqn. 47, the statistical distributions of A, B and Y can be written, respectively, [12] In fact, because pz4 is an odd function of Y (see eqn. 32) and the distribution of Y is even in [ -180", + 180"1, & is equal to zero.…”

Section: Numerical Examplesmentioning

confidence: 99%

Multipath fading effects on carrier recovery of BPSK signal in digital radio

Liu

Wei

1993

IEE Proc. I Commun. Speech Vis.

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Tracking performance of the I-Q carrier recovery loop for BPSK signal in bandlimited channel with multipath interference is analysed. The multipath fading channel is characterised by the Rummler's model (a simplified three-ray model) for line-of-sight digital radio system. A closed-form expression for the phaseerror variance related to the multipath interference, intersymbol interference and channel noise. is derived. Excess phase offset induced from the multipath interference is also examined. The closed-form expression of the jitter variance can be evaluated numerically to assess the degradation of synchroniser performance. Asymptotic limits of the performance are also discussed.

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“…The improvement ( decrease in sensitivity to multipath) is measured by the offset frequency required and by the additional fade necessary to achieve the same level of BER measured without the adaptive equalizer. [6] The adaptive equalizer used in the MDR-8-( ) is incorporated into the,70 MHz IF amplifier. It consists basically of two slope monitoring circuits tuned near the edges of the passband and a null detector tuned to the center of the passband.…”

Section: Ber Improvements Using Adaptive Equalizersmentioning

confidence: 99%

A High Performance 8 GHz, 8 PSK Digital Radio

Russo

Hartmann

1979

9th European Microwave Conference, 1979

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Rapid growth and modernization of microwave communications is currently taking place in both the commercial and military environments. Much of this growth is being accomplished through digital transmission, and calls for efficient utilization of frequency spectra allocated for LOS communications. As the bit efficiencies and data rates of digital radio systems have increased, the problems associated with multipath propagation phenomena have become more evident. This is due to the fact that the transmitter signal is randomized before transmission and the system behaves as though it has full loading at all times. To minimize outages and to meet path availability objectives, diversity protection alone, in many instances, is not sufficient. However, diversity protection, coupled with an acaptive equalizer, will meet the objective in all but a few severe cases. This paper describes a digital radio system operating in the 8 GHz band with 8 PSK modulation and nominal data rates of 45 Mb/s or 90 Mb/s. Multipath propagation and its effects on digital transmission are discussed. Improvements in bit error rate threshold obtained through the use of an adaptive equalizer designed into the receiver are also presented.

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Digital Radio Outage Due to Selective Fading-Observation vs Prediction From Laboratory Simulation

Cited by 65 publications

References 3 publications

A New Selective Fading Model: Application to Propagation Data

A New Selective Fading Model: Application to Propagation Data

Multipath fading effects on carrier recovery of BPSK signal in digital radio

A High Performance 8 GHz, 8 PSK Digital Radio

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