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A low-complexity pdcch channel blind detection method based on polar codes

A low-complexity, blind detection technology, applied in the communication field, can solve the problems of bit rate loss, detection complexity dependence, narrowing the scope of blind detection, etc., and achieve good practicability.

Active Publication Date: 2020-06-19
BEIHANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature 7C.Sun, Z.S.Fei, J.Q.Ni, W.Zhou, and D.Jia, "A novel design of downlink control information encoding and decoding based on polar codes," WirelessCommun.and Mobile Computing, to appear in 2018. Proposed a The PDCCH channel coding and decoding scheme based on polar codes marks the DCI format by adding signaling RI field at the coding end, thereby reducing the range of blind detection. This scheme causes a certain bit rate loss while improving detection efficiency
The above scheme effectively improves the efficiency of polar code blind detection, but the above scheme relies on a specific DCI coding method in the process of reducing the detection complexity

Method used

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  • A low-complexity pdcch channel blind detection method based on polar codes
  • A low-complexity pdcch channel blind detection method based on polar codes
  • A low-complexity pdcch channel blind detection method based on polar codes

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Embodiment

[0115] Build a PDCCH channel blind detection simulation link based on MATLAB, define C=22, d=2. That is, the sending end sends 22 PDCCH code blocks each time, and there are two kinds of DCI formats and two types of PDCCH formats. The two PDCCH formats account for half of the 22 PDCCHs. The DCI format length contained in each PDCCH candidate is randomly specified. The RNTI matching the user address is randomly implied in the CRC check bit of the control information carried by a certain PDCCH candidate. The RNTI implicit in other PDCCH candidates is randomly generated and inconsistent with the RNTI of the target user. L c =24bit. The simulated receiving end performs blind detection on the received 22 candidate PDCCHs. Since the receiving end does not know the DCI format, each PDCCH candidate needs to try two different DCI formats for detection, and the total number of PDCCH candidates in the search space is 44.

[0116] In the simulation, Two-stage[6] performs blind detect...

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Abstract

The invention discloses a polarization code-based low-complexity PDCCH (Physical Downlink Control Channel) channel blind detection method, which belongs to the field of communication. Firstly, a candidate DCI (Downlink Control Information) format which needs to be detected is determined; PDCCH candidates are then extracted one by one for decoding, d decoding results are obtained, and d path metricvalues CM are calculated at the same time; a decoding result which is checked to be correct is screened from the d decoding results; when the number of results is greater than 1, the information length corresponding to the smallest metric value is selected as the result for the current candidate PDCCH; when all PDCCH candidates do not have an information sequence conforming to CRC check, the information length corresponding to the smallest metric value CM is selected as the DCI information length actually carried by the current candidate PDCCH; and finally, CASCL decoding is carried out according to the information digit number carried in the current candidate PDCCH, an RNTI is descrambled for checking the CRC, if the CASCL decoding succeeds in checking, the correct result of the currentcandidate PDCCH is found out, or otherwise, a next candidate PDCCH is selected until the search is completed. The complexity of blind detection is reduced, and the practicability is good.

Description

technical field [0001] The invention belongs to the communication field, in particular to a polar code-based low-complexity PDCCH channel blind detection method. Background technique [0002] The downlink control channel is an important part of the downlink of the mobile communication system, in which the physical downlink control channel (PDCCH, Physical Downlink Control Channel) carries downlink control information (DCI, Downlink Control Information), including scheduling for downlink and uplink data transmission information and uplink power control information, etc. In order to realize the flexible choice of code rate, such as document 1: 3GPP TS 38.211, Physical channels and modulation, (Release 15), V15.2.0 (2018-06); disclosed: the control channel defines 1, 2, 4, 8 or 16 Each Control Channel Element (CCE, Control Channel Element) carries a DCI, which is called CCE aggregation level; in order to improve resource utilization efficiency under the premise of ensuring the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0038H04L1/0057H04L1/0061
Inventor 刘荣科孙贺冯宝平赵岭
Owner BEIHANG UNIV
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