Polar Code Bit Interleaving for Asymmetric Modulation Mapping
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Solution Overview
Problem
Existing wireless communication techniques do not fully leverage the asymmetry of encoded bits produced by polar coding, leading to performance degradation in wireless multiple-access communications systems.
Innovation Solution
The implementation of a transmitter with a polar coder, interleaver, and modulation mapper that cooperate to maximize polarization by interleaving and mapping encoded bits based on the asymmetry of the polar code construction, thereby enhancing the reliability of component channels and improving modulation schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing encoding and transmission techniques are used, then the system is simple to implement, but polarization is not maximized leading to degraded performance
Solution Approach 1:
The encoded bits from the polar coder are segmented into multiple groups based on their reliability characteristics. The interleaver divides the bit sequence into different segments that can be independently mapped to modulation symbols, allowing selective optimization of each segment's contribution to polarization.
Solution Approach 2:
Different portions of the encoded bit sequence are treated differently based on their local reliability properties. High-reliability bits are mapped to specific modulation symbol positions while low-reliability bits are mapped to other positions, optimizing the overall polarization effect by applying quality-specific handling to each local segment.
Solution Approach 3:
An interleaver is introduced as an intermediary component between the polar coder and the modulation mapper. This intermediary reorders the encoded bits according to their reliability characteristics before mapping, enabling the system to maximize polarization without requiring changes to the polar coding or modulation components themselves.
2Reliability
If encoded bits are not interleaved and mapped based on asymmetry, then the processing is simpler, but channel reliability is not optimized
Solution Approach 1:
The interleaver performs preliminary reordering of encoded bits based on their reliability characteristics before the modulation mapping stage. By pre-organizing the bits according to their asymmetry properties, the system prepares the data in an optimal state for polarization-enhanced transmission without adding complexity during the actual modulation process.
Solution Approach 2:
The mapping scheme changes the assignment parameters between encoded bits and modulation symbols based on the reliability characteristics of each bit. Instead of a fixed mapping, the system dynamically adjusts which bit maps to which symbol position according to the asymmetry of the polar code construction, optimizing channel reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A transmitter, such as a user equipment and/or a base station, may perform polar coding to encode bits. The polar coding may be associated with a plurality of component channels associated with a polar code length. The transmitter may interleave the encoded bits. The transmitter may map the interleaved encoded bits to a modulation symbol. The interleaving and mapping of each encoded bit may be based on an asymmetry of a polar code construction. The transmitter may transmit the interleaved encoded bits based on the mapping.