Polar Code PBCH Transmission with Hierarchical Interleaving
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Solution Overview
Problem
Current polar encoding/decoding performance in wireless communications systems, particularly in 5G scenarios, is not ideal and requires further improvement to meet the demands of enhanced mobile broadband, massive machine-type communications, and ultra-reliable and low latency communications.
Innovation Solution
The proposed solution involves a polar code transmission method and apparatus that enhance polar encoding/decoding performance by employing hierarchical interleaving and/or scrambling techniques based on hierarchical time sequence information, allowing for implicit transmission of time sequence information and improved reliability in information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polar encoding/decoding methods are used, then the encoding/decoding complexity is relatively low, but the encoding/decoding performance is not ideal for 5G communication scenarios
Solution Approach 1:
The patent divides the encoded sequence into multiple groups and applies different transformation operations (interleaving, scrambling, reordering) to each group. This segmentation allows the system to improve decoding performance through diversity while keeping each individual transformation relatively simple, thus resolving the contradiction between performance and complexity.
Solution Approach 2:
The patent introduces time sequence information as an additional dimension by transmitting data across M inconsecutive time units with unequal time intervals. This temporal dimension provides redundancy and diversity that improves reliability without significantly increasing the complexity of the encoding/decoding algorithms themselves.
2Reliability
If hierarchical interleaving and scrambling techniques are employed, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies hierarchical interleaving by dividing the encoded sequence into multiple groups and applying different interleaving patterns to each group. This segmentation approach improves transmission reliability through diversity while managing complexity by organizing the transformations in a structured hierarchical manner.
Solution Approach 2:
The patent performs transformation operations (interleaving, scrambling, reordering) on the encoded sequence before transmission. These preliminary actions prepare the data to be more robust against channel errors, improving reliability while the complexity is managed by performing these operations once during encoding rather than repeatedly during decoding.
3Measurement precision
If time sequence information is transmitted explicitly, then detection accuracy is high, but transmission efficiency decreases
Solution Approach 1:
The patent enables the receiver to perform blind detection of time sequence information by analyzing the transformation patterns in the received signal. The system is designed so that the receiver can self-determine the time sequence index without explicit signaling, achieving both good detection accuracy and transmission efficiency.
Solution Approach 2:
The patent uses the transformation operations (interleaving, scrambling, reordering) as intermediaries that embed time sequence information in the structure of the transmitted signal. This allows the time sequence information to be conveyed implicitly through the signal processing itself rather than through separate explicit signaling channels.
Data Source
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AI summary
A polar code-based transmission method and apparatus are provided, to better apply polar encodingto a PBCH. The method is as follows: performing, by a transmit end, polar encodingon a to-be-encoded first bit sequence, to generate an encoded sequence; performing, by the transmit end, a transformation operation on the encoded sequence, to obtain a second bit sequence, where the transformation operation includes at least one of scrambling, interleaving, and reordering; and sending, by the transmit end, the second bit sequence in M inconsecutive time units, where at least two time intervals between the time units in the M inconsecutive time units are unequal.