Concatenated RS-Turbo Coding for 4G Backhaul BER Improvement
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Solution Overview
Problem
The increasing demand for high-speed connections in 4G wireless networks strains backhaul networks, requiring efficient Bit-Error-Rate (BER) performance that traditional TDM transport cannot meet, necessitating a more effective error control mechanism.
Innovation Solution
Implementing a combination of Reed-Solomon (RS) coding and turbo coding with cyclic redundancy check (CRC) parity bits, where data is encoded using RS blocks that are then turbo coded, and interleaved to create input blocks for the turbo encoder, utilizing existing LTE hardware for error correction in backhaul systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional TDM transport is used in backhaul networks, then device complexity is reduced, but Bit-Error-Rate (BER) performance deteriorates and cannot meet 4G network requirements
Solution Approach 1:
The error control mechanism is segmented into multiple independent coding stages: first RS coding is applied to data blocks, then turbo coding is applied to the RS-coded blocks. This segmentation allows each coding stage to address specific error correction needs, achieving superior BER performance while managing complexity through modular processing
Solution Approach 2:
The patent combines two different error correction coding schemes (RS coding and turbo coding) into a composite error control mechanism. This composite approach leverages the strengths of both coding types - RS coding provides robust protection against burst errors while turbo coding provides excellent performance at low signal-to-noise ratios, achieving BER performance unattainable with either coding scheme alone
2Productivity
If higher data rates are provided in 4G wireless networks, then productivity is improved, but strain on backhaul networks increases requiring more complex error control
Solution Approach 1:
RS coding is applied as a preliminary error correction stage before turbo coding. This preliminary action protects the data against burst errors that may occur during high-speed transmission, preparing the data for subsequent turbo decoding and thereby maintaining reliability at higher data rates
Solution Approach 2:
An interleaver is introduced as an intermediary component between RS coding and turbo coding. The interleaver disperses consecutive data symbols across multiple RS-coded blocks, preventing burst errors from concentrating in a single block and thereby maintaining error correcting capability at higher data rates
3Reliability
If RS block size is increased to improve error correction, then reliability is improved, but the compatibility with turbo encoder input requirements deteriorates
Solution Approach 1:
The patent adjusts the RS block size parameter to be exactly 512 symbols, which is specifically chosen to be divisible by the turbo encoder's input block size requirements. This parameter change ensures that an integer number of RS blocks can be interleaved to form complete turbo encoder input blocks, maintaining compatibility while providing robust error correction
Data Source
AI summary
A system and method for providing error control coding for backhaul applications are disclosed. Data is first encoded using Reed-Solomon (RS) coding. The output RS blocks are then turbo coded. The size of the output RS blocks is selected to match the input of the turbo encoder. The bits from the RS blocks may be interleaved to create the input turbo blocks. Cyclic Redundancy Check (CRC) parity bits may be added to the data prior to RS coding.