liu.seSearch for publications in DiVA
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Flexible Interleaving Sub–systems for FEC in Baseband Processors
Linköpings universitet, Institutionen för systemteknik, Datorteknik. Linköpings universitet, Tekniska högskolan.
2010 (engelsk)Doktoravhandling, monografi (Annet vitenskapelig)
Abstract [en]

Interleaving is always used in combination with an error control coding. It spreads the burst noise, and changes the burst noise to white noise so that the noise induced bit errors can be corrected. With the advancement of communication systems and substantial increase in bandwidth requirements, use of coding for forward error correction (FEC) has become an integral part in the modern communication systems. Dividing the FEC sub-systems in two categories i.e. channel coding/de-coding and interleaving/de-interleaving, the later appears to be more varying in permutation functions, block sizes and throughput requirements. The interleaving/de-interleaving consumes more silicon due to the silicon cost of the permutation tables used in conventional LUT based approaches. For multi-standard support devices the silicon cost of the permutation tables can grow much higher resulting in an un-efficient solution. Therefore, the hardware re-use among different interleaver modules to support multimode processing platform is of significance.

The broadness of the interleaving algorithms gives rise to many challenges when considering a true multimode interleaver implementation. The main challenges include real-time low latency computation for different permutation functions, managing wide range of interleaving block sizes, higher throughput, low cost, fast and dynamic reconfiguration for different standards, and introducing parallelism where ever necessary.

It is difficult to merge all currently used interleavers to a singlearchitecture because of different algorithms and throughputs; however, thefact that multimode coverage does not require multiple interleavers to workat the same time, provides opportunities to use hardware multiplexing. The multimode functionality is then achieved by fast switching between differentstandards. We used the algorithmic level transformations such as 2-Dtransformation, and realization of recursive computations, which appear to bethe key to bring different interleaving functions to the same level. In general,the work focuses on function level hardware re-use, but it also utilizesclassical data-path level optimizations for efficient hardware multiplexingamong different standards.

The research has resulted in multiple flexible architectures supporting multiple standards. These architectures target both channel interleaving and turbo-code interleaving. The presented architectures can support both types of communication systems i.e. single-stream and multi-stream systems. Introducing the algorithmic level transformations and then applying hardware re-use methodology has resulted in lower silicon cost while supporting sufficient throughput. According to the database searching in March 2010, we have the first multimode interleaver core covering WLAN (802.11a/b/g and 802.11n), WiMAX (802.16e), 3GPP-WCDMA, 3GPP-LTE, and DVB-T/H on a single architecture with minimum silicon cost. The research also provides the support for parallel interleaver address generation using different architectures. It provides the algorithmic modifications and architectures to generate up to 8 addresses in parallel and handle the memory conflicts on-the-fly.

One of the vital requirements for multimode operation is the fast switching between different standards, which is supported by the presented architectures with minimal cycle cost overheads. Fast switching between different standards gives luxury to the baseband processor to re-configure the

interleaver architecture on-the-fly and re-use the same hardware for another standard. Lower silicon cost, maximum flexibility and fast switchability among multiple standards during run time make the proposed research a good choice for the radio baseband processing platforms.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press , 2010. , s. 189
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1312
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-54903ISBN: 978-91-7393-397-1 (tryckt)OAI: oai:DiVA.org:liu-54903DiVA, id: diva2:311111
Disputas
2010-05-20, Visionen, Hus B, Campus Valla, Linköpings universitet, Linköping, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2010-04-20 Laget: 2010-04-20 Sist oppdatert: 2010-04-20bibliografisk kontrollert

Open Access i DiVA

Flexible Interleaving Sub–systems for FEC in Baseband Processors(2624 kB)5469 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 2624 kBChecksum SHA-512
db364837df17fa01cb3ed112a89a427d68fc0d1cc05ebade9ea0db4a89cf63206afcedee30d70a0d5ef7445e8dcd14accbc9dfe27f4d0de256d7009a6328b8e6
Type fulltextMimetype application/pdf
Cover(171 kB)484 nedlastinger
Filinformasjon
Fil COVER01.pdfFilstørrelse 171 kBChecksum SHA-512
e28f866f8dd6d359c6a3ee678b671d346aa9c7e2776b6726b9585c111684515e683422234fb82866c6cd1dcc1be44e33f03088a1f05b3387aba8e9eb1be7596f
Type coverMimetype application/pdf

Personposter BETA

Asghar, Rizwan

Søk i DiVA

Av forfatter/redaktør
Asghar, Rizwan
Av organisasjonen

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 5469 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 2921 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf