| 1. |
- Hokfelt, Johan, et al.
(författare)
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A Turbo Code Interleaver Design Criterion Based on the Performance of Iterative Decoding
- 2001
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Ingår i: IEEE Communications Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1089-7798. ; 5:2, s. 52-54
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Tidskriftsartikel (refereegranskat)abstract
- The performance of a turbo code is dependent on two code properties: its distance spectrum and its suitability to be iteratively decoded. Both these properties are influenced by the choice of interleaver used in the turbo encoder. This paper presents an interleaver design criterion that focuses on the performance of iterative decoding, based on the correlation properties of the extrinsic inputs. Interleavers designed with the proposed criterion achieve very competitive performances, both in terms of convergence rates and error correcting capabilities
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| 2. |
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| 3. |
- Hokfelt, Johan, et al.
(författare)
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On the Theory and Performance of Trellis Termination Methods for Turbo Codes
- 2001
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Ingår i: IEEE Journal on Selected Areas in Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-0008 .- 0733-8716. ; 19:5, s. 838-847
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Tidskriftsartikel (refereegranskat)abstract
- The performance of a turbo code can be severely degraded if no trellis termination is employed. This paper investigates the implications of the choice of trellis termination method for turbo codes, and explains the origin of the performance degradation often experienced without trellis termination. An efficient method to derive the distance spectrum of turbo codes for different trellis termination methods is presented. Further, we present interleaver design rules that are tailored to each termination method. Using interleavers designed with these restrictions, we demonstrate that the performance difference between various termination methods is very small, including no trellis termination at all. For example, we demonstrate a turbo code with a 500-bit interleaver that exhibits no sign of an error floor for frame error rates as low as 10-8, even though no trellis termination is employed
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| 5. |
- Leanderson, Carl Fredrik, et al.
(författare)
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On the design of low rate turbo codes
- 2000
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Ingår i: Proc. IEEE Vehicular Technology Conference. - 0780357183 ; 2, s. 1200-1204
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Konferensbidrag (refereegranskat)abstract
- Low rate codes can be used to achieve coding gain in spread spectrum applications such as direct-sequence code division multiple access. Super-orthogonal- and maximum free distance convolutional codes as well as super-orthogonal turbo codes have previously been reported to be suitable for such systems. We focus on the design of component codes for low rate turbo coding schemes targeting the frame-error rate at low signal-to-noise ratios. We present code search criteria which yield high performing turbo codes on the additive white Gaussian noise channel. Simulation results show that these codes perform better than other low rate turbo codes previously reported in the literature
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