Base Station I/Q Component Mapping for Diversity

Solution Overview

Problem

Existing radio communication technologies face challenges in achieving both multi-user diversity and frequency diversity effects simultaneously, particularly in multicarrier communications, which affects the received quality of mobile stations, especially when mobile stations move at high speeds or use common channels.

Innovation Solution

A radio communication base station configuration that separates data symbols into in-phase and quadrature components, maps these components differently across subcarriers, with in-phase components mapped in a localized manner and quadrature components in a distributed manner, to generate combined symbols that achieve both frequency scheduling and frequency diversity transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frequency scheduling transmission is used to obtain multi-user diversity effect, then transmission efficiency is improved, but it cannot be applied when mobile stations move at high speed or to common channels

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidapplicability to high-speed mobile stations and common channels

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The data symbols are segmented into in-phase components and quadrature components. The in-phase components are mapped in a localized manner to achieve frequency scheduling and multi-user diversity, while the quadrature components are mapped in a distributed manner to achieve frequency diversity. This segmentation allows both transmission modes to operate simultaneously without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different mapping strategies are applied to different components of the same data signal. The in-phase components use localized mapping (frequency scheduling) while the quadrature components use distributed mapping (frequency diversity). This local quality differentiation enables the system to optimize for both multi-user diversity and frequency diversity within the same transmission stream.

Inventive Principle:

Principle #3Local quality

2Reliability

If frequency diversity transmission is used to obtain frequency diversity effect, then reliability is improved, but multi-user diversity effect cannot be obtained

Engineering Contradiction:

Improvereceived qualityVSAvoidmulti-user diversity effect

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The data symbols are segmented into in-phase components and quadrature components. The in-phase components are mapped in a localized manner to achieve frequency scheduling and multi-user diversity, while the quadrature components are mapped in a distributed manner to achieve frequency diversity. This segmentation allows both transmission modes to operate simultaneously without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The localized mapping results (in-phase components) and distributed mapping results (quadrature components) are combined to generate the final OFDM symbol. This merging allows the transmission signal to simultaneously carry both frequency scheduling information (for multi-user diversity) and frequency diversity information, achieving both effects in one transmission.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If data is frequency multiplexed on multiple subcarriers using conventional methods, then spectral efficiency is improved, but both multi-user diversity and frequency diversity cannot be obtained simultaneously

Engineering Contradiction:

Improvespectral efficiencyVSAvoidsimultaneous diversity effects

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The data symbols are segmented into in-phase components and quadrature components. The in-phase components are mapped in a localized manner to achieve frequency scheduling and multi-user diversity, while the quadrature components are mapped in a distributed manner to achieve frequency diversity. This segmentation allows both transmission modes to operate simultaneously without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different mapping strategies are applied to different components of the same data signal. The in-phase components use localized mapping (frequency scheduling) while the quadrature components use distributed mapping (frequency diversity). This local quality differentiation enables the system to optimize for both multi-user diversity and frequency diversity within the same transmission stream.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS7756215B2Radio communication base station apparatus and radio communication method in multi-carrier communications

Publication Date: 2010.07.13 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Provided is a radio communication base station device capable of acquiring both a multi-user diversity effect and a frequency diversity effect simultaneously in multi-carrier communications. In this device, modulation units (101-1 to 101-n) modulate data to mobile stations (MS#1 to MS#n) individually to create data symbols. A separation unit (102) separates each data symbol inputted, into an Ich (in-phase components) and a Qch (orthogonal components). An Ich arrangement unit (103) and a Qch arrangement unit (104) arrange the Ich and Qch, respectively, in a plurality of sub-carriers constituting an OFDM symbols, and output the same to a synthesization unit (105). This synthesization unit (105) synthesizes the Ich and Qch arranged for each sub-carrier, to create the synthesized symbol.