Measured Frequency Diversity Improvement for Digital Radio

Dirner, P.; Lin, S.H.

doi:10.1109/tcom.1985.1096195

Cited by 15 publications

(2 citation statements)

References 4 publications

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“…Space diversity in its most common form provides a protection channel for every working channel (1×1 protection) on a per-hop basis. Frequency diversity usually provides one or two protection channels for m working channels (1×m or 2×m protection) on the basis of switching sections that can contain as many as 10 hops in extreme cases [16], [17].…”

Section: Comparison Of Space and Frequency Diversitiesmentioning

confidence: 99%

A Simplified Practical Procedure for Evaluation of System Performance for A Line of Sight Relay

Abdul–Jabbar¹

2009

IJEEE

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The aim of this paper is to design and evaluate hop calculations and system performance for line of sight (LOS) radio relay links utilizing a simplified proposed procedure. Such a procedure is simulated for the determination of both hop calculations and system performance.The practical procedure of this paper has been ordered in a manner to solve up to 95% of the hop design problems encountered in practice. Two examples with different specifications and different required outage time are examined to fulfill the Committee Consultative International Radio (CCIR) recommendations.

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Section: Comparison Of Space and Frequency Diversitiesmentioning

confidence: 99%

A Simplified Practical Procedure for Evaluation of System Performance for A Line of Sight Relay

Abdul–Jabbar¹

2009

IJEEE

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“…As an alternative, we could employ frequency diversity techniques [10,11], where different replicas of the intended signal are transmitted at different frequency bands. With these techniques it is easy to have a large diversity order, with almost uncorrelated channels, provided that their frequency separation is much higher than the coherence bandwidth of the propagation channel (for broadband wireless systems, the channel is usually strongly frequency selective and the coherence bandwidth can be a small fraction of the symbol rate).…”

Section: Introductionmentioning

confidence: 99%

A spectrally efficient frequency diversity technique for single‐carrier modulations with frequency division multiplexing

Araujo¹,

Dinis²

2009

Trans Emerging Tel Tech

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SUMMARYWhen the number of relevant propagation paths between the transmitter and the receiver is small and/or when they are not separable (i.e. the difference between the corresponding delays is smaller than the symbol duration), we can have deep fading effects and poor performance, especially for slow-varying channels. In this case, the use of diversity techniques is strongly recommendable.In this paper, we consider an single-carrier-based (SC) block transmission, employing frequency domain equalisation (FDE) receivers and we present a frequency diversity technique that allows high spectral efficiencies. As with conventional frequency diversity techniques, L replicas of a given signal are transmitted at L different frequencies. However, contrarily to conventional frequency diversity schemes, up to L users can share this set of L frequency bands. Since this leads to strong interference levels, we propose an iterative, frequency-domain receiver where all the users sharing the L frequencies are jointly detected.Our performance results show that the proposed frequency diversity scheme allows high diversity gains, while keeping the spectral efficiency of conventional SC schemes. Moreover, we can cope with channels that can be severely time-dispersive and/or can have deep fading effects.

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Diversity Reception

Rogers¹

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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Measured Frequency Diversity Improvement for Digital Radio

Cited by 15 publications

References 4 publications

A Simplified Practical Procedure for Evaluation of System Performance for A Line of Sight Relay

A Simplified Practical Procedure for Evaluation of System Performance for A Line of Sight Relay

A spectrally efficient frequency diversity technique for single‐carrier modulations with frequency division multiplexing

Diversity Reception

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