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GSM TDMA Frame Rate Internal Active Noise Cancellation
Ansvarig organisation
2003 (Engelska)Ingår i: International Journal of Acoustics and Vibration, ISSN 1027-5851, Vol. 8, nr 3, s. 159-166Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A common problem in the world's most widely-used cellular telephone system, the GSM system, is the interfering signal generated by the switching nature of TDMA cellular telephony in handheld and other terminals. Signals are sent as chunks of data, speech frames, equivalent to 160 samples of data corresponding to 20 ms at sampling rate of 8 kHz. This paper describes a study of two different software solutions designed to suppress such interference internally in the mobile handset. The methods are 1) notch filtering, which is multiplicative in frequency, and 2) subtractive noise cancellation, which is an alternative method employing correlators. The latter solution is a straigtforward, although somewhat unorthodox, application of "in-wire" active noise control. Since subtraction is performed directly in the time domain, and we have access to the state of the mobile, it is also possible to consider a recurring pause in the interference caused by the idle frame in the transmission, when the mobile listens to other base stations communicating. More complex control algorithms, based on the state of the communication between the handset and the base station, can be utilised.

Ort, förlag, år, upplaga, sidor
Int. Inst. Acoustics and Vibration, USA , 2003. Vol. 8, nr 3, s. 159-166
Nyckelord [en]
Active Noise Cancellation, Cellular Phone, GSM, Bumblebee
Nationell ämneskategori
Signalbehandling
Identifikatorer
URN: urn:nbn:se:bth-9433Lokalt ID: oai:bth.se:forskinfoE457CBF0D0634F12C1256E2A0040AD2BOAI: oai:DiVA.org:bth-9433DiVA, id: diva2:837278
Tillgänglig från: 2012-09-18 Skapad: 2004-01-29 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Claesson, Ingvar

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