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Improving Error Performance in Bandwidth-Limited Baseband Channels
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap.
2012 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

Channel coding has been largely used for the purpose of improving error performance on a communications system. Typical methods based on added redundancy allow for error detection and correction, this improvement however comes at a cost of bandwidth. This thesis focuses on channel coding for the bandwidth-limited channel where no bandwidth expansion is allowed.

We first discuss the idea of coding for the bandwidth-limited channel as seen from the signal space point of view where the purpose of coding is to maximize the Euclidian distance between constellation points without increasing the total signal power and under the condition that no extra bits can be added. We then see the problem from another angle and identify the tradeoffs related to bandwidth and error performance.

This thesis intends to find a simple way of achieving an improvement in error performance for the bandwidth-limited channel without the use of lattice codes or trellis-coded modulation.

The proposed system is based on convolutional coding followed by multilevel transmission. It achieved a coding gain of 2 dB on Eb/No or equivalently, a coding gain of approximately 2.7 dB on SNRnorm without increase in bandwidth. This coding gain is better than that obtained by a more sophisticated lattice code Gosset E8 at the same error rate.

sted, utgiver, år, opplag, sider
2012. , s. 46
Emneord [en]
channel coding, bandwidth-limited channel, band-limited channel, error performance, BER, lattice codes, trellis-coded modulation, TCM, convolutional coding, multilevel transmission, soft decisions, hard decisions, MPAM
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-12745Arkivnummer: TEX120311OAI: oai:DiVA.org:hig-12745DiVA, id: diva2:548524
Eksternt samarbeid
University of Ljubljana, Slovenia
Fag / kurs
Electronics
Utdanningsprogram
Electronics/Telecommunications – master’s programme (two years) (swe or eng)
Presentation
2012-06-14, 11:320, Kungsbäcksvägen 47, Gävle, 08:00 (engelsk)
Uppsök
Technology
Veileder
Examiner
Tilgjengelig fra: 2012-08-31 Laget: 2012-08-31 Sist oppdatert: 2012-08-31bibliografisk kontrollert

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Juan Alfaro_Masters thesis(1826 kB)1243 nedlastinger
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