Training Sequence Code Design for GERAN Interference Mitigation

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Solution Overview

Problem

Conventional Training Sequence Codes (TSCs) in GERAN systems degrade system performance under severe Co-Channel Interference (CCI) and are not optimized for high-order modulation schemes like 16-QAM and 32-QAM, affecting channel estimation and signal detection.

Innovation Solution

Designing new TSCs with improved auto-correlation and cross-correlation properties using Golay complementary sequences and quasi-complementary sequences, and incorporating guard sequences to minimize Inter-Symbol Interference, while optimizing SNR degradation for efficient channel estimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional TSCs are used in GERAN systems, then the system operates with existing modulation schemes (GMSK, 8-PSK), but system performance degrades under severe Co-Channel Interference and is not optimized for high-order modulation schemes

Engineering Contradiction:

Improvecompatibility with high-order modulation schemesVSAvoidperformance under Co-Channel Interference

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the fundamental parameters of the training sequence code by using Golay complementary sequences instead of conventional sequences. This parameter change enables the TSC to maintain low cross-correlation under severe CCI conditions while also being compatible with high-order modulation schemes like 16-QAM and 32-QAM, thus resolving both the adaptability and reliability issues simultaneously

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If conventional TSCs are used, then the implementation is simple, but channel estimation accuracy degrades under severe CCI

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidCo-Channel Interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of severe CCI into a benefit by designing TSCs with Golay complementary sequences that have zero cross-correlation properties. This mathematical property transforms the interference environment from harmful to beneficial, as the orthogonality of the sequences allows accurate channel estimation even when multiple channels are severely interfered with, thus improving measurement precision while counteracting the harmful factors

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If guard sequences are added to minimize Inter-Symbol Interference, then transmission reliability improves, but the complexity of TSC design increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidTSC design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-designing Golay complementary sequences with built-in guard sequence structures that inherently minimize Inter-Symbol Interference. The sequences are constructed in advance with specific mathematical properties that automatically provide ISI protection, thus improving transmission reliability while the systematic design approach keeps the complexity manageable through reuse of the same mathematical framework

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8059750B2Method and apparatus for generating training sequence code in a communication system

Publication Date: 2011.11.15 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and apparatus for generating a TSC in a communication system are provided, in which a pair of sequences A and B having auto-correlation and cross-correlation properties are generated and the TSC is generated by inserting guard sequences Z each having z zero symbols in the most significant bits of the sequences A and B.