Superposition Coding Scramble Interleave Pattern Decoding

Solution Overview

Problem

In signal processing technologies using Superposition Coding (SPC), there is a need to improve the decoding precision of multiplexed signals with multiple power layers, where interference signals and desired signals are intertwined, and existing methods face challenges in accurately decoding these signals due to lack of information about scramble patterns and interleave patterns used by other users.

Innovation Solution

A device and method that includes a transmission processing unit for setting transmission signal sequences using scramble and interleave patterns corresponding to power allocation information, and a reception processing unit for acquiring and canceling interference using descramblers and deinterleavers, allowing for improved decoding precision by reproducing the scramble and interleave patterns used in interference signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If superposition coding multiplexing is used to allocate radio resources to multiple users with overlap, then cell communication capability is improved, but decoding precision deteriorates due to signal interference

Engineering Contradiction:

Improvecell communication capabilityVSAvoiddecoding precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by pre-applying scramble patterns and interleave patterns to transmission signals before multiplexing. This allows the receiving end to reproduce these patterns for interference signals, enabling effective interference cancellation and improving decoding precision while maintaining the high communication capability provided by SPC multiplexing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful interference between multiplexed signals into a benefit by using the known scramble and interleave patterns to generate accurate interference signal replicas. These replicas are then subtracted from the received signal, transforming the interference problem into a solvable cancellation process that improves decoding accuracy

Inventive Principle:

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

2Productivity

If power allocation is used to multiplex signals on overlapping radio resources, then spectral efficiency is improved, but decoding precision deteriorates due to interference between power layers

Engineering Contradiction:

Improvespectral efficiencyVSAvoiddecoding precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by pre-applying scramble patterns and interleave patterns to transmission signals before multiplexing. This allows the receiving end to reproduce these patterns for interference signals, enabling effective interference cancellation and improving decoding precision while maintaining the high communication capability provided by SPC multiplexing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful interference between multiplexed signals into a benefit by using the known scramble and interleave patterns to generate accurate interference signal replicas. These replicas are then subtracted from the received signal, transforming the interference problem into a solvable cancellation process that improves decoding accuracy

Inventive Principle:

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

3Device complexity

If interference cancellation is performed without knowing scramble patterns and interleave patterns of other users, then device complexity is reduced, but decoding precision deteriorates

Engineering Contradiction:

Improveprocessing complexityVSAvoiddecoding precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies universality by using the same scramble patterns and interleave patterns for both transmission signals and interference signals. This allows a single set of patterns to serve multiple functions: maintaining security for desired signals and enabling interference cancellation for multiplexed signals, thereby improving decoding precision without significantly increasing device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10700812B2Device, method, and program

Publication Date: 2020.06.30 SONY GROUP CORP

AI summary

A device, method, and program that can improve decoding precision of a desired signal in a case in which multiplexing/multiple access is performed using power allocation. The device includes a transmission processor configured to set each of transmission signal sequences of a plurality of power layers that are to be multiplexed using power allocation as a target and apply at least one of a scrambler using a scramble pattern and an interleaver using an interleave pattern corresponding to information regarding the power allocation.