DSSS Valid-Bit Erasure Correction for Noisy Wireless Links
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Solution Overview
Problem
Conventional error correction schemes in wireless radio communications are inefficient in noisy environments, leading to significant overhead and reduced effective bandwidth due to the difficulty in detecting and correcting corrupted bits, especially in systems like the 2.4 GHz ISM band.
Innovation Solution
The implementation of Valid Bit Error Correction (VBEC) in Direct Sequence Spread Spectrum (DSSS) systems, which uses checksum operations and valid/invalid bit information to correct corrupted data, reducing the need for retransmissions and increasing processing gain without increasing transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional error correction schemes are used in wireless radio communications, then error detection and correction capability is provided, but significant overhead is created and effective bandwidth is reduced
Solution Approach 1:
The patent extracts and utilizes the valid bit information that is already present in DSSS systems but previously unused for error correction purposes. By taking out this existing valid bit data and applying it specifically to correct corrupted bits, the system achieves error correction without adding the typical overhead of conventional error correction codes, thus maintaining effective bandwidth while improving reliability
Solution Approach 2:
The system uses its own existing valid bit information to correct its own errors. The DSSS system's inherent valid bit markers serve the dual purpose of their original function plus error correction, making the system self-correcting without external assistance or additional redundancy bits, thereby avoiding bandwidth reduction
2Reliability
If conventional error correction schemes are used in noisy environments, then error correction is attempted, but processing overhead increases and retransmissions are required
Solution Approach 1:
The patent performs preliminary identification of valid bits during the DSSS decoding process itself, before error correction is needed. By pre-marking which bits are valid during decoding, the system prepares the necessary information in advance, making the actual error correction process simpler and more efficient when corrupted bits are detected, thus reducing processing overhead while maintaining high reliability in noisy environments
3Reliability
If more error correction information is transmitted to reliably receive and correct data, then error correction reliability improves, but overhead increases and power consumption increases
Solution Approach 1:
The patent makes the valid bit information serve multiple functions: it maintains its original role in DSSS decoding while simultaneously functioning as error correction data. This multi-functionality eliminates the need for separate error correction information transmission, reducing overall transmission overhead and associated power consumption while maintaining or improving error correction reliability
Data Source
AI summary
A wireless device decodes Direct Sequence Spread Spectrum (DSSS) encoded data and identifies data that can not be successfully DSSS decoded (invalid data). A checksum operation uses successfully decoded DSSS data (valid data) to correct the identified invalid corrupted data. The improved error correction leverages the valid and invalid bit information normally provided in DSSS systems to more effectively correct corrupted data bits. The improved error correction increases the processing gain of wireless devices thus increasing the effective wireless range without having to increase transmit power.