WLAN Packet Encoding with Two-Level Coding Against Interference
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Solution Overview
Problem
Conventional wireless local area networks, such as those based on IEEE 802.11, often experience packet transmission failures due to interference from other wireless transmissions, which can lead to decreased system throughput and unreliable data transfer.
Innovation Solution
A two-level coding scheme is employed in the transmitter apparatus, comprising an outer cyclic encoder and an inner block encoder, which segments packets into multiple blocks and encodes them using cyclic and block coding schemes, respectively, to mitigate interference through forward error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter uses a lower data rate with higher fraction of check bits to improve reliability, then packet transmission reliability is improved, but packet duration increases leading to higher probability of harmful interference
Solution Approach 1:
The packet is divided into multiple blocks, and each block is independently encoded using block coding scheme. This segmentation allows the system to maintain shorter effective transmission durations for each block while still providing comprehensive error protection through the outer cyclic code across the entire packet structure.
Solution Approach 2:
The harmful interference effect is extracted and confined to specific blocks rather than affecting the entire packet. By using block coding on segmented blocks, the system can identify and correct errors locally without requiring the entire packet to be retransmitted, thus reducing the effective impact duration of interference.
2Object-affected harmful factors
If the transmitter keeps the overall packet duration the same with fixed overheads per packet, then interference probability is reduced, but system throughput decreases
Solution Approach 1:
The system changes the coding parameters by employing a two-level coding structure where the inner block code provides efficient error correction with lower overhead compared to traditional single cyclic code. This parameter change allows maintaining shorter packet durations with fixed overheads while preserving throughput through more efficient error correction that reduces retransmissions.
3Device complexity
If conventional single cyclic coding scheme is used, then device complexity is low, but ability to mitigate severe interference is insufficient
Solution Approach 1:
The patent employs a composite coding structure combining two different coding schemes: outer cyclic code and inner block code. This composite approach leverages the strengths of both coding types - the cyclic code provides good error detection and correction for burst errors, while the block code provides efficient correction for random errors, achieving superior interference mitigation without excessive complexity.
Data Source
AI summary
An encoding method for a wireless local area network includes encoding a packet via a cyclic coding scheme into a first amount of multiple first blocks; processing each of the first amount of the first blocks into a second amount of multiple second blocks; and encoding the second amount of the second blocks via a block coding scheme.