Results 161 to 170 of about 13,125 (210)
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Turbo decoding of quantized data
IEEE Transactions on Communications, 2002Much of the work on turbo decoding assumes that the decoder has access to infinitely soft (unquantized) channel data. In practice, however, a quantizer is used at the receiver and the turbo decoder must operate on finite precision, quantized data. Hence, the maximum a posteriori (MAP) component decoder which was designed assuming infinitely soft data ...
Udayan Dasgupta, Costas N. Georghiades
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Turbo-decoder quantization for UMTS
IEEE Communications Letters, 2001The use of turbo codes is proposed for high-rate data services in third generation wireless communication systems. Bit-true models are mandatory for hardware and software implementations. In this paper we present to the best of our knowledge the first investigation of a combined bit-width optimization of input data and internal data for an 8-state ...
Heiko Michel, Norbert Wehn
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IEEE Communications Letters, 2007
Decoding delay is an important consideration for the use of turbo codes in practical applications. We propose a new structure for turbo codes which is very suitable for parallel decoding. It is shown by union bound analysis and simulation results that the proposed system performance is comparable to that of the classical turbo ...
Orhan Gazi, Ali Özgür Yilmaz
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Decoding delay is an important consideration for the use of turbo codes in practical applications. We propose a new structure for turbo codes which is very suitable for parallel decoding. It is shown by union bound analysis and simulation results that the proposed system performance is comparable to that of the classical turbo ...
Orhan Gazi, Ali Özgür Yilmaz
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IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211), 2002
Recently, turbo code has gathered much attention for its outstanding performance. However, its complexity and decoding latency are severe drawbacks. Turbo code has been adopted in the 3GPP specification as one of the channel coding schemes. To implement a turbo decoder compliant with the 3GPP specification, the author adopted the sliding window method ...
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Recently, turbo code has gathered much attention for its outstanding performance. However, its complexity and decoding latency are severe drawbacks. Turbo code has been adopted in the 3GPP specification as one of the channel coding schemes. To implement a turbo decoder compliant with the 3GPP specification, the author adopted the sliding window method ...
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Energy-efficient turbo decoder
IEEE International Conference on Acoustics Speech and Signal Processing, 2002Turbo codes have been recently adopted in the next generation of wideband CDMA standards. These codes achieve superior performance at the expense of high computational complexity. This makes their low energy implementation a very important yet challenging problem.
Jagadeesh Kaza, Chaitali Chakrabarti
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On allocation of turbo decoder iterations
14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003., 2004The computational requirements of turbo decoders are heavy and depend on the number of decoding iterations. However, only a few iterations are often enough for obtaining an error free outcome. Instead of idling during the unused iterations, the released time slots can be used for enabling extra iterations required by the decoding, when the errors are ...
Perttu Salmela +3 more
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IEEE Transactions on Communications, 1998
Summary: List decoding of turbo codes is analyzed under the assumption of a maximum-likelihood (ML) list decoder. It is shown that large asymptotic gains can be achieved on both the additive white Gaussian noise and fully interleaved flat Rayleigh-fading channels. It is also shown that the relative asymptotic gains for turbo codes are larger than those
Krishna R. Narayanan, Gordon L. Stüber
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Summary: List decoding of turbo codes is analyzed under the assumption of a maximum-likelihood (ML) list decoder. It is shown that large asymptotic gains can be achieved on both the additive white Gaussian noise and fully interleaved flat Rayleigh-fading channels. It is also shown that the relative asymptotic gains for turbo codes are larger than those
Krishna R. Narayanan, Gordon L. Stüber
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Optimality and Duality of the Turbo Decoder
Proceedings of the IEEE, 2007The near-optimal performance of the turbo decoder has been a source of intrigue among communications engineers and information theorists, given its ad hoc origins that were seemingly disconnected from optimization theory. Naturally one would inquire whether the favorable performance might be explained by characterizing the turbo decoder via some ...
Phillip A. Regalia, John MacLaren Walsh
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On List Sequence Turbo Decoding
IEEE Transactions on Communications, 2005An algorithm for decoding Turbo codes that combines conventional Turbo decoding and list sequence maximum a posteriori probability decoding is presented and evaluated. Compared to previous results on this theme, performance improvements in the order of 0.7 dB are obtained for Turbo codes with 514-b pseudorandom interleaving at a frame error rate of 10 ...
Carl Fredrik Leanderson +1 more
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Convergence and errors in turbo-decoding
Proceedings. 2001 IEEE International Symposium on Information Theory (IEEE Cat. No.01CH37252), 2001Summary: Turbo-codes are decoded using iterative decoding algorithms with somewhat elusive convergence properties. In this paper, the modes of convergence observed in an extensive series of turbo-code simulations are categorized by examining the bit convergence behavior for each frame.
Andrew C. Reid +2 more
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