Transmission Device Spatial Modulation Precoding Matrix

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Solution Overview

Problem

The existing wireless communication technologies face challenges with increased data traffic, particularly due to high peak-to-average power ratio (PAPR) associated with antenna switching in spatial modulation methods, which burdens the analog/RF circuit and limits MIMO performance.

Innovation Solution

A transmission device that employs a precoding matrix and a new spatial modulation method to impose information on the modulation in the spatial domain, using a set of precoding matrices and spatial layer mapping patterns to improve resource efficiency and reduce PAPR.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If antenna switching is used in spatial modulation methods, then MIMO resource efficiency is improved, but peak-to-average power ratio increases burdening the analog/RF circuit

Engineering Contradiction:

ImproveMIMO resource efficiencyVSAvoidpeak-to-average power ratio

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent changes the modulation parameter from antenna switching to precoding matrix selection. By selecting different precoding matrices from a codebook based on channel state information, the system achieves spatial modulation benefits without the high PAPR associated with antenna switching, thus resolving the contradiction between resource efficiency and power ratio burden

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical antenna switching mechanism with a signal processing-based precoding matrix selection approach. This substitution eliminates the need for physical antenna switching while achieving similar or better MIMO resource efficiency without the associated PAPR increase

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If antenna switching is used to impose information on modulation, then spatial domain modulation is achieved, but analog/RF circuit burden increases

Engineering Contradiction:

Improvespatial domain modulation capabilityVSAvoidanalog/RF circuit burden

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent substitutes the mechanical antenna switching system with a digital signal processing system that selects precoding matrices. This replacement maintains spatial domain modulation capability while significantly reducing analog/RF circuit complexity and burden

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the spatial modulation parameter from antenna index to precoding matrix index. This parameter change enables spatial domain modulation through signal processing rather than physical switching, thereby reducing device complexity in the analog/RF domain

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11451273B2Transmission device, method, and recording medium

Publication Date: 2022.09.20 SONY GROUP CORP

AI summary

A mechanism of modulation in a more appropriate spatial domain is to be provided.A transmission device includes a signal processing unit that applies a precoding matrix on the basis of a first bit sequence to a complex signal point sequence converted from a second bit sequence, and the precoding matrix applied to the complex signal point sequence corresponds to the first bit sequence in a predetermined combination of a first bit sequence candidate and each element of a set of precoding matrices.