Patent
Method and apparatus for turbo code decoding
Cheng-Hung Lin,An-Yu Wu +1 more
- 30 Apr 2008
5
TL;DR: In this article, a method and apparatus for turbo code decoding is presented to reduce memory consumption during calculation of state metrics, where the original state metric is converted to a differential metric before being stored into a memory device.
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Abstract: A method and apparatus for turbo code decoding are provided to reduce memory consumption during calculation of state metrics. In an embodiment of a turbo code decoder, a natural recursion unit comprises a plurality of add-compare-select (ACS) units performing natural recursion operations to generate a state metric. The original state metric is then converted to a differential metric before being stored into a memory device. The differential metric contains less data than the state metric so that memory consumption is reduced. To restore the original state metric from the differential metric, a plurality of revival units operating in parallel is provided. Thereby, the state metric is reacquired from the differential metric, and a Log Likelihood Recursion (LLR) operation is accordingly performed by an LLR unit.
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Citations
Patent
Using a joint decoding engine in a wireless device
Jia Tang,Atul A. Salvekar,Shantanu Khare,Gokhan Mergen,Jonathan Sidi,Jong Hyeon Park,Subramanya P. Rao,Abhinav Gupta +7 more
- 29 Apr 2010
TL;DR: In this paper, a joint decoding engine for the first symbol stream and the second symbol stream in a received multiple input multiple output (MIMO) signal is presented, and a scaled channel estimate for a wireless transmission channel and scaled noise covariance of the MIMO signal are determined.
23
Patent
Turbo decoder metrics initialization
Fu-Hsuan Chiu,Mark David Hahm +1 more
- 21 Sep 2012
TL;DR: In this paper, a turbo decoder may obtain a data block associated with a transmission time interval, the data block comprising a sequence of bits, the encoded data block being encoded according to a coding rate.
2
Patent
Viterbi decoder and writing and reading method
Keng-Chih Lu
- 20 Jul 2010
TL;DR: In this article, a Viterbi decoder includes a survival memory unit, for storing a plurality of survivor metric into a writing column of a writing bank of the plurality of banks in alternating intervals of a clock according to the writing bank order and the writing column order.
Patent
Apparatus, method, and computer program products utilizing a generalized turbo principle
Lars P. B. Christensen
- 15 Nov 2007
TL;DR: In this paper, the generalized Turbo principle is used to enable the exchange of region beliefs between components. But the generalized turbo principle does not provide the same advantages over the traditional Turbo principle, such as lower Bit Error Rate (BER) and/or a better quality of the end-result marginals.
Patent
Intel CPU-based parallel Turbo decoding method
Wang Jie,Bi Mingyong,Fan Pengbo,Li Lei,Su Yong,Wang Dongming +5 more
- 31 Aug 2016
TL;DR: In this article, an Intel CPU-based parallel Turbo decoding method comprising of a single instruction multiple data stream instruction (SIMSTI) and a single-input multiple-output (SIMO) instruction is presented.
References
Patent
High speed turbo codes decoder for 3G using pipelined SISO Log-MAP decoders architecture
Quang Nguyen
- 02 Jan 2001
TL;DR: In this article, a Bandband Processor for Wireless Communications (BPPC) is presented, which encompasses several improved Turbo codes method to provide a more practical and simpler method for implementation a Turbo Codes Decoder in ASIC or DSP coding.
64
Patent
Embedded state metric storage for MAP decoder of turbo codes
Victor On-Kwok Li,Jianhao Hu,Alfred K. K. Wong +2 more
- 07 Sep 2005
TL;DR: In this article, an embedded state metric storage is used for MAP (Maximum A Posterior)-based decoder of turbo codes to reduce the memory requirement of state metrics storage, where the information of the selected state metric is not required to be kept in the state metric memory.
39
Patent
Method and apparatus for decoding a bit sequence
Alexander Worm,Heiko Michel,Norbert Wehn +2 more
- 21 Jun 2002
TL;DR: In this paper, a method and apparatus are disclosed for decoding according to a Log-MAP algorithm, a bit sequence encoded by a convolutional encoder and received through a noisy channel.
37
Patent
Turbo decoder employing max and max* map decoding
William H. Smith,Koji O. Tanaka,Shuzhan Xu +2 more
- 08 Jul 2002
TL;DR: In this article, a bypass algorithm switches from max* term computation to only max term computation in later iterations with little or no degradation in decoder performance, based on increasing intrinsic signal-to-noise ratio (SNR) of the iterative MAP decoding.
35
Patent
Turbo decoder employing simplified log-map decoding
Shuzhan Xu
- 14 Apr 2003
TL;DR: In this paper, a simplified log-maximum a posteriori (SMAP) decoding algorithm is proposed to calculate reliability information as a log likelihood ratio for a log-MAP algorithm using a reduced set of path metrics recursively updated based on maximum likelihood recursion.
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