Data Symbol Allocation for Wireless Systems

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Solution Overview

Problem

Conventional OFDMA schemes face issues with Peak-to-Average Power Ratio (PAPR) characteristics and Inter-Channel Interference (ICI), leading to poor signal quality and increased power amplifier costs, as well as timing synchronization challenges due to individual subcarrier allocation.

Innovation Solution

A method and apparatus for allocating data symbols using multiple carrier modulation (MCM), where data symbols are grouped into subcarrier groups, with precoding and strategic allocation across the entire frequency band to minimize ICI and optimize subcarrier usage, allowing for efficient frequency diversity and reduced PAPR.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If individual subcarrier allocation is used in conventional OFDMA schemes, then frequency diversity can be achieved, but timing synchronization becomes challenging and signal quality deteriorates due to ICI

Engineering Contradiction:

Improvefrequency diversityVSAvoidtiming synchronization

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the frequency band into multiple subcarrier groups rather than allocating individual subcarriers. Each user is allocated a specific group of subcarriers, which maintains frequency diversity while reducing timing synchronization challenges and ICI compared to individual subcarrier allocation.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If individual subcarrier allocation is used in conventional OFDMA schemes, then frequency diversity can be achieved, but signal quality deteriorates due to ICI

Engineering Contradiction:

Improvefrequency diversityVSAvoidInter-Channel Interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Speed

If conventional OFDMA schemes are used, then high speed data transmission can be achieved, but PAPR characteristics deteriorate leading to increased power amplifier costs

Engineering Contradiction:

Improvedata transmission speedVSAvoidpower amplifier cost

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent segments the frequency band into multiple subcarrier groups and allocates specific groups to users, which reduces PAPR compared to conventional OFDMA while maintaining high data transmission speed capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the allocation parameter from individual subcarriers to subcarrier groups, which modifies the signal characteristics to reduce PAPR and thereby降低 power amplifier costs while maintaining high data transmission speed.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10651985B2Method and apparatus for allocating a plurality of data symbols in a wireless communication system

Publication Date: 2020.05.12 LG ELECTRONICS INC

AI summary

According to one embodiment, a method for transmitting an uplink signal includes transmitting the uplink signal including a block of data symbols. The block of data symbols are mapped to at least two sets of subcarrier blocks. Each data symbol of the block of data symbols is mapped to one of subcarriers of the at least two sets of subcarrier blocks. The at least two sets of subcarrier blocks are not contiguous in frequency. The block of data symbols are mapped in sequence starting with a first data symbol to the at least two sets of subcarrier blocks and in increasing order of subcarrier index.