A Blind Detection Method of Physical Layer Control Channel Based on Polar Code

A polar code and blind detection technology, applied in the field of communication, can solve problems affecting system response speed and power consumption, huge decoding resource overhead and delay, etc.

Active Publication Date: 2021-07-06
BEIHANG UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Therefore, the blind detection process affects the response speed and power consumption of the entire system
Since the control information is protected by channel coding, decoding all candidates through an exhaustive search scheme will cause huge decoding resource overhead and delay

Method used

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  • A Blind Detection Method of Physical Layer Control Channel Based on Polar Code
  • A Blind Detection Method of Physical Layer Control Channel Based on Polar Code
  • A Blind Detection Method of Physical Layer Control Channel Based on Polar Code

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Embodiment Construction

[0058] combined with Figure 1-4 And the technical scheme in the summary of the invention, the present invention is described in detail as follows again:

[0059] Step 1. Set the search space to include 22 candidate PDCCHs; determine that there are 2 candidate DCI formats to be detected, and the corresponding control information lengths are K 1 ,K 2 ;The length of the CRC check bit is set to 24 bits.

[0060] Step 2. Extract the PDCCH candidates in the search space one by one. For the current candidate PDCCH, use the HTHD algorithm to obtain information lengths of K 1 ,K 2 Decoding is carried out below, and 2 decoding results are obtained

[0061] Step 3. At the same time, for the current candidate PDCCH, calculate the information lengths K 1 ,K 2 2 path metrics for HTHD decoding.

[0062] For a candidate PDCCH of length N, in DCI format length K i Under , the metric value of DCI is calculated as follows:

[0063]

[0064] in, Represents the estimation of the t...

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Abstract

The present invention proposes a polar code-based physical layer control channel blind detection method, specifically a polar code-based two-stage blind detection method under the PDCCH channel, which reduces the number of detections by about 50% and can effectively improve the system efficiency. Including (1) DCI detection metric value; (2) DCI metric value calculation criterion based on fast HTHD decoding algorithm; (3) two-stage blind detection scheme. The blind detection process needs to determine two unknown degrees of freedom, namely the DCI length and the PDCCH length. The total amount of candidate code blocks is equal to the product of the number of DCI format types and the number of PDCCH format types. In detection, if the DCI format can be determined first, half of the invalid candidates can be excluded in advance to reduce the complexity. During the DCI detection process, the decoder does not know the correct DCI information length, so it needs to try to decode according to the possible DCI length, and calculate the reliability of the decoding result under different DCI length assumptions according to the decoding result, and use it as a judgment DCI The basis for the format.

Description

【Technical field】 [0001] The invention belongs to the communication field, and in particular relates to a polar code-based blind detection method for reducing the number of times of blind detection of a physical downlink control channel. 【Background technique】 [0002] The PDCCH, that is, a downlink control channel (Physical downlink control channel, PDCCH), carries downlink control information (Downlink control information, DCI) delivered by a base station to a user. Downlink control information includes scheduling information for downlink and uplink data transmission and uplink power control information, etc. Correctly parsing DCI is a prerequisite for downlink data information processing. Since the control information length is generally short, in order to improve DCI transmission efficiency, the base station maps the DCI information of multiple users to the same control channel resource domain after channel coding, that is, the control information of multiple users multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L5/00
CPCH04L1/0038H04L5/0007H04L5/0053
Inventor 刘荣科孙贺
Owner BEIHANG UNIV
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