Change search
ReferencesLink to record
Permanent link

Direct link
Digital Beamforming as a Means for Interference Cancellation
Responsible organisation
1998 (English)Report (Other academic)Alternative title
Digital lobformning som ett hjälpmedel för interferens undertryckning (Swedish)
Abstract [en]

The increasing demand for user capacity is a major challenge to network operators today. In order to increase the capacity of a mobile radio network, it is desirable to exploit the spatial domain in an efficient way. An array adds spatial domain selectivity in order to improve the Carrier-to-Interference ratio(C/I). An adaptive antenna array can further improve the Carrier-to-Interference ratio(C/I) by suppressing interfering signals. The proposed circular array consists of K elements and combines fixed beamformers with interference cancellers. The fixed beamformers use a weight matrix to form multiple beams. The interference canceller suppresses undesired signals, called jammers, leaking into the desired beam. The desired signal is filtered out by the fixed beamforming structure. Due to the side-lobes, interfering signals will also be present in this beam. Two alternative strategies may be chosen to cancel these interferers; use the other fixed beam outputs as inputs to an adaptive interference canceller, or regenerate the outputs from the other fixed beams and generate clean signals which are used as inputs to adaptive interference cancellers. Results are presented using beamformer weights obtained from a Least Square (LS) minimisation as well as minimax.

Abstract [sv]

Ett sätt att öka kapaciteten i dagens mobiltelefoni-system är att använda flera antenner i basstationerna d.v.s använda digital lobformning. Denna rapporten beskriver hur man med hjälp utav digital lobformning kan förbättra kvaliteten på den mottagna signalen.

Place, publisher, year, edition, pages
Blekinge Tekniska Högskola Forskningsrapport, ISSN 1103-1581 ; 21
Keyword [en]
Beamforming, Interference cancellation, Adaptive Interference Cancellation, NLMS, leaky-LMS, mini-max beamformer
National Category
Signal Processing
URN: urn:nbn:se:bth-00502Local ID: diva2:837615
Available from: 2012-09-18 Created: 2000-03-15 Last updated: 2015-06-30Bibliographically approved

Open Access in DiVA

fulltext(1708 kB)14 downloads
File information
File name FULLTEXT01.pdfFile size 1708 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Claesson, Ingvar
Signal Processing

Search outside of DiVA

GoogleGoogle Scholar
Total: 14 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 25 hits
ReferencesLink to record
Permanent link

Direct link