| 1. |
- Falahati, Sorour, 1971, et al.
(författare)
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Future improvements to wideband CDMA
- 1999
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Ingår i: Proceedings Radiovetenskap och Kommunikation, Karlskona, Sweden. ; , s. 470-475
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Konferensbidrag (refereegranskat)
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| 2. |
- Berens, Friedbert, et al.
(författare)
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Modulation and Coding
- 2000
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Ingår i: Third Generation Mobile Communication Systems (Ramjee Prasad, Werner Mohr and Walter Konhäuser editors), chapter 5. - 1580530826
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 3. |
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| 4. |
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| 5. |
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| 6. |
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| 7. |
- Frenger, Pål, 1968, et al.
(författare)
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Code-spread CDMA using low-rate convolutional codes
- 1998
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Ingår i: Proceedings IEEE International Symposium on Spread Spectrum Techniques and Applications, Sun City, South Africa. - : Institute of Electrical and Electronics Engineers (IEEE). ; 48:1, s. 374-378
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Konferensbidrag (refereegranskat)abstract
- In code division multiple-access (CDMA) systems, maximum total throughput assuming a matched filter receiver can be obtained by spreading with low-rate error control codes. Previously, orthogonal, bi-orthogonal and super-orthogonal codes have been proposed for this purpose. We present in this paper 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 super-orthogonal codes as well as conventionally coded and spread systems. We also show that the proposed low rate codes will give simple encoder and decoder implementations. With these codes, any rate 1/n, n⩽512, are obtained for constraint lengths up to 11, resulting in a more flexible and powerful scheme than those previously proposed.
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| 8. |
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| 9. |
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| 10. |
- Frenger, Pål, 1968, et al.
(författare)
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Combined coding and spreading in CDMA systems using maximum free distance convolutional codes
- 1998
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Ingår i: Proceedings IEEE Vehicular Technology Conference, Ottawa, Canada. ; 3, s. 2497-2501
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Konferensbidrag (refereegranskat)abstract
- 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.
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