Integrated Circuit Sign Inversion for Scrambling Seed Adaptability

Solution Overview

Problem

In radio communication systems, when the scrambling seed changes during retransmission, the combination of likelihood information from initial and retransmitted packets fails to improve signal quality due to differing sign sequences, requiring additional circuitry and increased power consumption for soft value processing.

Innovation Solution

An integrated circuit that generates inversion data to convert packet data scrambled with one seed into data scrambled with another, allowing sign inversion of likelihood information to align sequences and combine them effectively, eliminating the need for exclusive circuits and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If soft value processing is used to combine likelihood information from initial and retransmitted packets, then signal quality improvement is achieved, but circuit complexity and power consumption increase

Engineering Contradiction:

Improvesignal qualityVSAvoidcircuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts only the essential operation needed for likelihood information combination - sign inversion based on scrambling seed differences - rather than implementing full soft value processing. By isolating and implementing only the sign inversion function using existing hard value processing circuits, the solution achieves signal quality improvement without requiring complex dedicated soft value processing circuits.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent makes existing hard value processing circuits (scrambling circuits and decoding circuits) perform dual functions: their original hard value processing function and the additional sign inversion function for likelihood information combination. This multi-functionality eliminates the need for separate exclusive circuits for soft value processing, reducing circuit complexity while maintaining signal quality improvement capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If soft value processing is used to combine likelihood information from initial and retransmitted packets, then signal quality improvement is achieved, but power consumption increases

Engineering Contradiction:

Improvesignal qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts only the essential operation needed for likelihood information combination - sign inversion based on scrambling seed differences - rather than implementing full soft value processing. By isolating and implementing only the sign inversion function using existing hard value processing circuits, the solution achieves signal quality improvement without requiring complex dedicated soft value processing circuits.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent makes existing hard value processing circuits (scrambling circuits and decoding circuits) perform dual functions: their original hard value processing function and the additional sign inversion function for likelihood information combination. This multi-functionality eliminates the need for separate exclusive circuits for soft value processing, reducing circuit complexity while maintaining signal quality improvement capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If scrambling seed changes during retransmission, then adaptability is improved, but likelihood information combination fails due to sign sequence mismatch

Engineering Contradiction:

Improvescrambling seed adaptabilityVSAvoidlikelihood information combination

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies sign inversion to the likelihood information of the initially transmitted packet based on the difference between scrambling seeds. By inverting signs in the reverse direction of the scrambling seed change, the patent aligns the sign sequences of initial and retransmitted packets, enabling successful likelihood information combination even when scrambling seeds differ.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces sign inversion as an intermediary operation between receiving likelihood information and combining it. This intermediary process corrects the sign sequence mismatch caused by scrambling seed changes, acting as a mediator that enables reliable likelihood information combination while maintaining the flexibility to use different scrambling seeds.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10187182B2Integrated circuit, radio communication apparatus, and method

Publication Date: 2019.01.22 KK TOSHIBA

AI summary

According to one embodiment, an integrated circuit receives first packet scrambled with a first scrambling seed and second packet scrambled with a second scrambling seed, generates inversion data, generate third likelihood information by inverting signs of the first likelihood information or the second likelihood information based on the inversion data, and generates fourth likelihood information based on the third likelihood information and the second or first likelihood information.