Wireless Receiver Frame Format for Dynamic Carrier Mode Selection

Solution Overview

Problem

Wideband wireless communication systems face challenges in high data rate transmissions due to high delay spreads, which increase complexity and power requirements, and existing modulation schemes like OFDM have inefficiencies in hardware complexity and power usage, while single carrier systems struggle with equalization in high delay spread channels.

Innovation Solution

A method and system that process received signals in either single carrier or multiple carrier modes based on a common preamble/header frame format, allowing devices to determine the mode and perform appropriate demodulation, reducing hardware complexity and enabling coexistence between different types of devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If wide bandwidth channels are used to achieve high data rates, then data rate is improved, but delay spread increases causing higher complexity and power requirements

Engineering Contradiction:

Improvedata rateVSAvoidcomplexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements dynamic modulation scheme selection where the system can switch between single carrier and multiple carrier (OFDM) modes based on channel conditions. The common preamble/header format enables receiving devices to determine the appropriate demodulation mode dynamically, allowing the system to adapt to varying delay spread conditions while maintaining high data rates when possible and reducing complexity when delay spread is high.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of modulation scheme from fixed to variable, allowing selection between single carrier and OFDM based on detected channel characteristics. This parameter change enables the system to optimize the trade-off between data rate and complexity by choosing the appropriate modulation mode for current channel conditions.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If OFDM is used for high data rate transmission, then data rate is improved, but hardware complexity and power consumption increase

Engineering Contradiction:

Improvedata rateVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic modulation scheme selection where the system can switch between single carrier and multiple carrier (OFDM) modes based on channel conditions. The common preamble/header format enables receiving devices to determine the appropriate demodulation mode dynamically, allowing the system to adapt to varying delay spread conditions while maintaining high data rates when possible and reducing complexity when delay spread is high.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a universal frame format with a common preamble and header that works for both single carrier and OFDM payload types. This multi-functionality allows a single receiver design to handle both modulation schemes, eliminating the need for separate hardware implementations and reducing overall system complexity and power consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If single carrier is used for low complexity, then device complexity is reduced, but equalization performance degrades in high delay spread channels

Engineering Contradiction:

ImprovecomplexityVSAvoidequalization performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements dynamic modulation scheme selection where the system can switch between single carrier and multiple carrier (OFDM) modes based on channel conditions. The common preamble/header format enables receiving devices to determine the appropriate demodulation mode dynamically, allowing the system to adapt to varying delay spread conditions while maintaining high data rates when possible and reducing complexity when delay spread is high.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP2294772B1Physical layer frame format for wideband wireless communications systems

Publication Date: 2016.01.06 MARVELL WORLD TRADE LTD

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AI summary

Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory.