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Energy Efficient MIMO Channel Pre-processor Using a Low Complexity On-Line Update Scheme
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- Zhang, Chenxin (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
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- Prabhu, Hemanth (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
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- Liu, Liang (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
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- (creator_code:org_t)
- 2012
- 2012
- English 4 s.
- In: [Host publication title missing].
- Conference paper (peer-reviewed)
Abstract
Subject headings
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- This paper presents a low-complexity energy efficient channel pre-processing update scheme, targeting the emerging 3GPP long term evolution advanced (LTE-A) downlink. Upon channel matrix renewals, the number of explicit QR decompositions (QRD) and channel matrix inversions are reduced since only the upper triangular matrices R and R^-1 are updated, based on an on-line update decision mechanism. The proposed channel pre-processing updater has been designed as a dedicated unit in a 65nm CMOS technology, resulting in a core area of 0.242mm2 (equivalent gate count of 116K). Running at a 330MHz clock, each QRD or R^-1 update consumes 4 or 2 times less energy compared to one exact state-of-the-art QRD in open literature.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Channel pre-processing
- QR decomposition
- MIMO
- QR update
Publication and Content Type
- kon (subject category)
- ref (subject category)
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- By the author/editor
- Zhang, Chenxin
- Prabhu, Hemanth
- Liu, Liang
- Edfors, Ove
- Öwall, Viktor
- About the subject
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- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
- and Electrical Engin ...
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- Lund University
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