Variable-Length Payload Coding with Padding-Aware Decoding
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Solution Overview
Problem
Existing data compression techniques for wireless communications result in variable length payloads, which can cause decoding issues at the receiver due to unknown payload length, and current channel coding methods are inefficient for non-uniform message probabilities.
Innovation Solution
A method involving payload compression with added padding to create a fixed-length payload, followed by encoding and decoding with consideration of padding bits to improve decoding performance, utilizing entropy reduction and prior knowledge of padding bit probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If variable length compression is used on payloads, then compression efficiency is improved, but decoding reliability deteriorates due to unknown payload length at the receiver
Solution Approach 1:
The patent applies preliminary action by adding a fixed number of padding bits to the compressed payload before channel coding. This ensures the receiver knows the exact payload length in advance, enabling reliable decoding while maintaining compression efficiency. The padding is predetermined based on the maximum expected compressed size, resolving the contradiction between compression and decoding reliability.
2Reliability
If padding bits are added to create fixed length payload, then decoding reliability is improved, but transmission efficiency deteriorates due to increased payload size
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of padding bits based on the actual compressed payload size and the maximum expected size. Rather than always using maximum padding, the system optimizes the padding length to match the specific transmission needs, thereby maintaining decoding reliability while minimizing the impact on transmission efficiency.
3Reliability
If channel coding is applied to compressed payload, then error correction capability is improved, but complexity increases due to variable length handling
Solution Approach 1:
The patent applies preliminary action by converting the variable length compressed payload into a fixed length format through padding before channel coding. This preprocessing step simplifies the subsequent channel coding process, as fixed length inputs are easier to handle and process, thereby reducing coding complexity while maintaining error correction capability.
4Device complexity
If fixed length payload is used for channel coding, then coding simplicity is improved, but compression efficiency deteriorates due to inability to exploit data redundancy
Solution Approach 1:
The patent applies segmentation by separating the payload processing into two distinct stages: first applying variable length compression to exploit data redundancy and reduce size, then adding padding to achieve fixed length for channel coding. This two-stage approach allows both compression efficiency and coding simplicity to be achieved without compromising either objective.
Data Source
AI summary
Certain aspects of the present disclosure provide data compression and channel coding techniques for variable length payloads. A method performed at a wireless node may include obtaining a payload for transmission, compressing the payload using a variable length compression technique to obtain a compressed payload having compressed payload bits of a first length, adding padding bits to the compressed payload to obtain a padded compressed payload. The padded compressed payload comprises information bits including the compressed payload bits and the padding bits. The method further includes encoding the padded compressed payload and outputting the encoded padded compressed payload.