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An approach to analog mitigation of RFI

Ödling, Per LU ; Börjesson, Per Ola LU ; Magesacher, T and Nordstrom, T (2002) In IEEE Journal on Selected Areas in Communications 20(5). p.974-986
Abstract
Among all noise sources present in wireline transmission systems we focus on one special type: narrowband radio frequency interference generated by radio amateurs (HAM) and broadcast radio stations. This disturbance, characterized by high power and narrow bandwidth, has the potential of overloading the receiver's analog-to-digital converter (ADC). Once the ADC is in saturation, any countermeasure taken in digital domain will fail. A viable way to face this problem is cancellation using the common-mode signal as a reference. This paper describes in detail an adaptive, mixed-signal, narrowband interference canceller employing a modified recursive least-squares algorithm, which is split into an analog and a digital part. The mixed-signal... (More)
Among all noise sources present in wireline transmission systems we focus on one special type: narrowband radio frequency interference generated by radio amateurs (HAM) and broadcast radio stations. This disturbance, characterized by high power and narrow bandwidth, has the potential of overloading the receiver's analog-to-digital converter (ADC). Once the ADC is in saturation, any countermeasure taken in digital domain will fail. A viable way to face this problem is cancellation using the common-mode signal as a reference. This paper describes in detail an adaptive, mixed-signal, narrowband interference canceller employing a modified recursive least-squares algorithm, which is split into an analog and a digital part. The mixed-signal approach enables the circuit to generate an interference-cancelling signal of several MHz while operating the adaptive algorithm at some kilohertz. Simulation as well as measurement results show a steady-state disturbance suppression of about 35 dB. The convergence speed is high enough to protect the ADC from overloading due to time-variant HAM interference. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
radio frequency interference, cancellation, interference mitigation
in
IEEE Journal on Selected Areas in Communications
volume
20
issue
5
pages
974 - 986
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000176008600011
  • scopus:0036601303
ISSN
1558-0008
DOI
10.1109/JSAC.2002.1007379
language
English
LU publication?
yes
id
80c5c498-acbe-445e-8918-f03cda4fbd83 (old id 336084)
date added to LUP
2007-11-08 07:41:08
date last changed
2017-12-10 04:30:52
@article{80c5c498-acbe-445e-8918-f03cda4fbd83,
  abstract     = {Among all noise sources present in wireline transmission systems we focus on one special type: narrowband radio frequency interference generated by radio amateurs (HAM) and broadcast radio stations. This disturbance, characterized by high power and narrow bandwidth, has the potential of overloading the receiver's analog-to-digital converter (ADC). Once the ADC is in saturation, any countermeasure taken in digital domain will fail. A viable way to face this problem is cancellation using the common-mode signal as a reference. This paper describes in detail an adaptive, mixed-signal, narrowband interference canceller employing a modified recursive least-squares algorithm, which is split into an analog and a digital part. The mixed-signal approach enables the circuit to generate an interference-cancelling signal of several MHz while operating the adaptive algorithm at some kilohertz. Simulation as well as measurement results show a steady-state disturbance suppression of about 35 dB. The convergence speed is high enough to protect the ADC from overloading due to time-variant HAM interference.},
  author       = {Ödling, Per and Börjesson, Per Ola and Magesacher, T and Nordstrom, T},
  issn         = {1558-0008},
  keyword      = {radio frequency interference,cancellation,interference mitigation},
  language     = {eng},
  number       = {5},
  pages        = {974--986},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Journal on Selected Areas in Communications},
  title        = {An approach to analog mitigation of RFI},
  url          = {http://dx.doi.org/10.1109/JSAC.2002.1007379},
  volume       = {20},
  year         = {2002},
}