DWMC Pilot Symbol for Complex Channel Equalization

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Solution Overview

Problem

Multi carrier transmission systems using wavelet transformation based OFDM struggle to utilize pilot symbols effectively due to real number conversion, limiting their ability to handle complex information for channel equalization.

Innovation Solution

Incorporating a pilot symbol composed of contiguous identical data across multiple symbols, which undergoes wavelet transformation, allowing for channel equalization and handling of complex information by extracting and processing the pilot symbol for phase and frequency adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If real coefficient wavelet filter bank is used for multi carrier transmission, then data transmission capability is improved, but ability to handle complex information for channel equalization deteriorates

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidability to handle complex information

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the transmission signal by inserting a dedicated pilot symbol composed of contiguous identical data into the multi carrier signal. This pilot symbol is specifically designed to carry reference information for channel equalization, separating the function of data transmission from channel characterization, thereby enabling complex information handling within the real coefficient wavelet filter bank framework

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pilot symbol acts as an intermediary element between the transmitted signal and the channel equalization process. By inserting this known reference signal (contiguous identical data) into the transmission, the receiver can estimate channel characteristics and perform equalization, thus mediating the interaction between real coefficient transformation and complex information requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If pilot symbol is not effectively utilized, then system simplicity is maintained, but channel equalization performance deteriorates

Engineering Contradiction:

Improvesystem simplicityVSAvoidchannel equalization performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-configuring a pilot symbol with contiguous identical data before transmission. This known reference signal is inserted in advance into the multi carrier signal, allowing the receiver to perform channel estimation and equalization without requiring complex adaptive training sequences, thus maintaining system simplicity while improving equalization performance

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7529308B2Communication apparatus and communication method using digital wavelet multi carrier transmission system

Publication Date: 2009.05.05 PANASONIC HOLDINGS CORP

AI summary

In case of disposing a pilot symbol in data transmission which depends on a DWMC transmission system, in a plurality of transmission symbols on a time axis, a pilot symbol, which becomes a signal of a sine wave, is configured, by giving contiguous identical data in a plurality of predetermined symbols. By transmitting a transmission signal with the use of this pilot signal, between a transmitting device and a receiving device, it is possible to carry out channel equalization by complex information which is obtained from a pilot symbol.