Novel Blind Identification of LDPC Codes Using Average LLR of Syndrome a Posteriori Probability

Xia, Tian; Wu, Hsiao-Chun

doi:10.1109/tsp.2013.2293975

Cited by 100 publications

(105 citation statements)

References 31 publications

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“…When it is known that the channel code has been chosen from a set of predefined candidate set, the receiver can use this a priori information for achieving a better blind channel code identification. This problem was addressed in [41][42][43].…”

Section: Research Related To Signaling Overheadmentioning

confidence: 99%

Improving the Efficiency of Control Signaling in Wireless Multiple Access Systems

Moosavi¹

2013

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To my lovely wife, my beloved parents, and my dear sisters; without them I would not be here."Even if you are on the right track, you'll get run over if you just sit there." Will Rogers AbstractPrior to the transmission of payload data in any multiple access system, there is generally a need to send control information such as scheduling assignments, transmission parameters and HARQ acknowledgments. This process is called control signaling and has a significant impact on the overall system performance. This dissertation considers different aspects of control signaling and proposes some novel schemes for improving it. The dissertation is split into two parts where in the first part the focus is on the transmission of scheduling assignments, and in the second part the focus is on improving the "blind decoding" process that is used to achieve adaptive coding and modulation in transmission of control information.More specifically, in the first part of the dissertation we first compare the two conventional schemes for control signaling using extensive system simulations. In doing so, we use practical assumptions on the scheduling algorithm as well as on the compression and transmission of the scheduling information. We then provide two schemes for reducing the amount of control signaling that concerns the transmission of scheduling assignments. The first scheme, which is reminiscent of source coding with side information, uses the knowledge that each user has about its own channel condition to compress the scheduling information more effectively. The second scheme uses the fact that in wireless multiple access systems, a user with a given channel condition can in principle decode the data intended to the users that have weaker channels. Therefore, the idea is to send the scheduling information of different terminals in a differential manner starting from the user with the weakest channel and letting all the terminals overhear the transmission of one another. Finally, in the last section of this part we use some of the recent results in information theory to form a general framework for the comparison of different control signaling schemes. We formulate an optimization problem that for a given desired error probability finds the minimum required number of channel uses for a given signaling scheme.In the second part of the thesis, we propose three schemes for reducing the complexity of the blind decoding process. The first one is a novel scheme for fast blind identification of channel codes. More precisely, we propose an efficient algorithm that for a given sequence of received symbols and a given linear channel code, finds the posterior probability that all the parity check relations of the code are satisfied. We then use this quantity to perform a sequential statistical hypotheses test that vii reduces the computational complexity of blind decoding. The idea in the second scheme is to broadcast a control message prior to the transmission of control information to instruct only a subset of the terminals (ideally only ...

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Section: Research Related To Signaling Overheadmentioning

confidence: 99%

Improving the Efficiency of Control Signaling in Wireless Multiple Access Systems

Moosavi¹

2013

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“…Some blind-detection algorithms for other types of codes such as Bose-Chaudhuri-Hocquenghem (BCH) codes [5] or low-density parity-check (LDPC) codes [6] were also devised. However, in the next-generation mobile communication standard (5G) developed by the 3GPP, the control channel will be protected by polar codes [7].…”

Section: Introductionmentioning

confidence: 99%

Blind detection of polar codes

Giard

Balatsoukas‐Stimming

Burg

2017

2017 IEEE International Workshop on Signal Processing Systems (SiPS)

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Abstract-Polar codes were recently chosen to protect the control channel information in the next-generation mobile communication standard (5G) defined by the 3GPP. As a result, receivers will have to implement blind detection of polar coded frames in order to keep complexity, latency, and power consumption tractable. As a newly proposed class of block codes, the problem of polar-code blind detection has received very little attention. In this work, we propose a low-complexity blind-detection algorithm for polar-encoded frames. We base this algorithm on a novel detection metric with update rules that leverage the a priori knowledge of the frozen-bit locations, exploiting the inherent structures that these locations impose on a polar-encoded block of data. We show that the proposed detection metric allows to clearly distinguish polar-encoded frames from other types of data by considering the cumulative distribution functions of the detection metric, and the receiver operating characteristic. The presented results are tailored to the 5G standardization effort discussions, i.e., we consider a short low-rate polar code concatenated with a CRC.

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“…Turbo codes are very popular as its near-Shannon-limit performance [4]. They have been widely applied to many communication systems, such as deep space communication systems and mobile communication systems [5]- [6].…”

Section: Introductionmentioning

confidence: 99%

Turbo Codes in AMC Systems For Blind Identification

al.¹

2017

IJECIERD

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Novel Blind Identification of LDPC Codes Using Average LLR of Syndrome a Posteriori Probability

Cited by 100 publications

References 31 publications

Improving the Efficiency of Control Signaling in Wireless Multiple Access Systems

Improving the Efficiency of Control Signaling in Wireless Multiple Access Systems

Blind detection of polar codes

Turbo Codes in AMC Systems For Blind Identification

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