A Radio Repeater Interference Cancellation Model for Mobile Communication Systems

Lee, Moohong; Keum, Byungjik; Lee, Hwang Soo; Kim, Joowan

doi:10.1109/icwmc.2008.16

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…This solution can be used in addition to an echo cancellation system [9] to improve the efficiency and shut down the echo cancellation system during the absence of radio frequency echo in order to economize energy.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Radio Frequency Echo using frequency sweeping and power analysis

Zeher

Binczak

Joli³

2014

2014 Ieee Region 10 Symposium

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International audienceCoupling between repeater's antennas, called Radio Frequency Echo (RFE) deteriorates signal quality and compromises system stability. If the channel insulation is insufficient, the power in the closed-loop raises with time according to the gain margin value. Multiple methods of echo cancellation exists. Generally, these techniques are based on correlation calculation and adaptive filtering. However, their efficiency and algorithm's convergence speed are calling into question under signal's modulation and real-time constraints, specially with narrow band signals having frequency hopping as GSM or TETRA. This paper describes a real time method of RFE detection and estimation independently of the nature of the incoming signal. It is based on frequency sweeping and analysis of power ripples, and it can be implemented on FPGA for real-time purpose. It gives an accurate estimation of corresponding gain margin and loop delay. Index Terms—Radio frequency echo, gain margin, narrow band, frequency hopping

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Section: Resultsmentioning

confidence: 99%

Characterization of Radio Frequency Echo using frequency sweeping and power analysis

Zeher

Binczak

Joli³

2014

2014 Ieee Region 10 Symposium

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“…This new path can reduce significantly the ripples even for rather large gain‐margin. Also, this solution can be used with any other echo cancellation system to improve the efficiency, to save energy by shutting down the cancellation system when the RFF disappears, to adjust the repeater gain according to the echoes power, and to trigger an alarm to prevent the signal corrupting and hardware damaging. This solution could also be extended to the other configurations such as multipath and modulated signals.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Relationships of Δ and τ to the other parameters of the closed‐loop are mathematically performed, then confirmed by simulations and measurements. We propose here an example of application in the context of radio repeater ICAN to improve its efficiency.…”

Section: Example Of Applications: Ican Modelmentioning

confidence: 99%

Detection and measurement of radio frequency feedback for an on‐frequency repeater

Zeher

Bilbault

Binczak

2017

Int J Communication

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International audienceThe radio frequency feedback (RFF) occurs when the insulation is insufficient between the antennas of an on-frequency repeater, increasing digital transmission errors. In addition, a strong RFF could compromise system stability of the on-frequency repeater because of the growing power in the closed-loop. Automatic gain control is widely used by the on-frequency repeater to regulate the power, this solution being generally used with echo cancellation processes. Most of echo cancellation techniques are based on digital processing such as adaptive filters whose the effectiveness and the algorithm speed are depending on the signal frequency, the bandwidth and the closed-loop parameters. This paper describes a solution of RFF estimation and detection regardless of the receiving signal modulation. By using the frequency scanning and the analysis of the power spectral density peaks in the system, this solution is reliable whatever are the values of the gain-margin and the loop-delay. Simulations and experimental implementation using field-programmable gate array validate the solution. In addition, an example of applications is given in the context of the interference cancellation

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Related Work

Ding

Luo

2013

Signals and Communication Technology

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A Radio Repeater Interference Cancellation Model for Mobile Communication Systems

Cited by 13 publications

References 3 publications

Characterization of Radio Frequency Echo using frequency sweeping and power analysis

Characterization of Radio Frequency Echo using frequency sweeping and power analysis

Detection and measurement of radio frequency feedback for an on‐frequency repeater

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