Error floors of digital FM in simulcast and Rayleigh fading

Petrovic, R.; Filipovic, S.

doi:10.1109/25.704849

Cited by 6 publications

(8 citation statements)

References 18 publications

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“…The assumption of quasi-stationarity of the channel is reasonable since in many mobile radio systems, the bit length is so short that the channel does not change significantly during that time; for 30-m/s velocity and 900-MHz carrier frequency, the channel changes in 10 ms, while bit durations are typically tens of s. The contributions of the Doppler effect are included in the frequency offset . As was shown in [3], the effects of the Doppler shift are well approximated by a constant offset of twice the rms Doppler spread. The contribution denotes an intentional frequency offset that might be introduced in a simulcast system in order to avoid long-lasting fading dips.…”

Section: Mathematical Modelmentioning

confidence: 79%

“…Substituting the in-phase and quadrature components of the received signal into (3), we get (4) where Equation 4shows that the instantaneous frequency consists of two parts, the average frequency of the component signals, and the correction term. One of us has shown earlier [3] how this equation can be used to predict performance dominated by Doppler shifts.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…E RROR floors, where increased signal strength does not reduce the error rate, have been observed and studied in satellite and land mobile communications as well as simulcast. They have been attributed to Doppler shift (e.g., [1]- [3]), or to time dispersion (e.g., [4]- [7]). The error floor is of great importance both in mobile radio and in simulcast systems.…”

Section: Introductionmentioning

confidence: 99%

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Multipath effects of FSK with frequency-discriminator detection

Petrovic¹,

Molisch²

2000

IEEE Trans. Veh. Technol.

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We analyze how multipath effects, namely, errors due to channel-induced intersymbol interference, influence the error probability of frequency shift keying (FSK) with frequency-discriminator detection. We first introduce a new mathematical technique that allows insights into the error mechanisms. This technique is also capable of dealing with frequency shifts of the multipath components, postdiscriminator filtering, and nonlinearities in the discriminator. We then show that increasing the modulation index decreases the error floor, especially in the presence of frequency shifts. We also discuss the differences between prediscriminator and postdiscriminator filtering and show that an integrator is the best postdiscriminator filter.

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Section: Mathematical Modelmentioning

confidence: 79%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multipath effects of FSK with frequency-discriminator detection

Petrovic¹,

Molisch²

2000

IEEE Trans. Veh. Technol.

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“…It was reported in the literature that the error floor is proportional to the square of the normalized (with respect to the bit, or symbol period) delay spread [6].…”

Section: Introductionmentioning

confidence: 99%

“…The rms delay spread (defined as the second central moment of the power delay profile) is considered to be the major cause of error floor in high data rate mobile systems [3][4][5][6]. It was reported in the literature that the error floor is proportional to the square of the normalized (with respect to the bit, or symbol period) delay spread [6].…”

Section: Introductionmentioning

confidence: 99%

Statistical properties of the delay spread in a two path mobile radio with Nakagami fading channel

Alshamali

Al-Oqleh

2005

AEU - International Journal of Electronics and Communications

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Synchronization of Single-Frequency Simulcast Networks Using Network Time Protocol

Bregni

Lacavalla

Propersi

et al. 2007

2007 IEEE International Conference on Communications

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 Single-frequency simulcast networks use two or more Radio Base Stations (RBS) to transmit simultaneously the same signal on the same radio channel over the service area. To ensure correct operation and good performance, simulcast networks need accurate time and frequency synchronization. In this work, we designed a system for synchronizing RBS clocks by way of Network Time Protocol (NTP) packets. The goal is to allow simulcast operation when external sources of synchronization, such as GPS, are not available or when the operator prefers to distribute timing alternatively, in particular by IP network facilities used for data transport. Time stamps are disseminated by a master RBS and used in slave stations to steer local clocks. The mechanism proposed was modelled, simulated and implemented in an experimental prototype. Simulation and experimental measurement results meet requirements and demonstrate the practical feasibility of this approach for commercial application.

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Error floors of digital FM in simulcast and Rayleigh fading

Cited by 6 publications

References 18 publications

Multipath effects of FSK with frequency-discriminator detection

Multipath effects of FSK with frequency-discriminator detection

Statistical properties of the delay spread in a two path mobile radio with Nakagami fading channel

Synchronization of Single-Frequency Simulcast Networks Using Network Time Protocol

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