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Combined coding and...
Combined coding and spreading in CDMA systems using maximum free distance convolutional codes
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- Frenger, Pål, 1968 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Orten, Pål, 1966 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ottosson Gadd, Tony, 1969 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 1998
- 1998
- Engelska.
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Ingår i: Proceedings IEEE Vehicular Technology Conference, Ottawa, Canada. ; 3, s. 2497-2501
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In CDMA systems maximum theoretical performance can be obtained by spreading with low-rate error control codes. Previously, orthogonal and superorthogonal codes have been proposed for this purpose. We present a family of rate-compatible low-rate convolutional codes with maximum free distance. The performance of these codes for spectrum spreading in a CDMA system is evaluated and shown to outperform that of orthogonal and superorthogonal codes as well as conventional coding/spreading schemes. We also show that our low-rate codes will give simple encoder and decoder implementation. With these codes any 1/n rate can be obtained regardless of the constraint length, resulting in a more flexible and powerful scheme than those proposed up to now.
Ämnesord
- NATURVETENSKAP -- Data- och informationsvetenskap (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences (hsv//eng)
Nyckelord
- maximum free distance
- low-rate convolutional codes
- orthogonal codes
- superorthogonal codes
- rate-compatible
- CDMA
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)