Transmitter Frame Length Assignment for Wireless Error Reduction

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Solution Overview

Problem

Existing error correction methods, such as block coding and convolutional coding, do not effectively address the unique error characteristics of frame-length-modulated signals in wireless communication, and trellis coded modulation is not applicable due to varying symbol lengths in frame length modulation schemes.

Innovation Solution

A transmitter assigns different frame lengths to each code in a code sequence, ensuring that the first frame length of one code is greater than the second frame length of another code, and the third frame length is smaller than the fourth frame length, to reduce transmission errors, and a receiver detects and decodes these frame lengths to accurately transmit information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If frame length modulation is used to enable wireless communication with low power consumption, then power consumption is reduced and communication efficiency is improved, but transmission errors increase due to noise, attenuation, and multipath fading

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission accuracy

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by varying the frame length parameter to represent different code values in the code sequence. Each code is assigned at least two different frame lengths, allowing the system to encode information through frame length variation while maintaining low power consumption through selective frame transmission

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements beforehand cushioning by arranging frame lengths in a specific order where a first frame length is greater than a second frame length, and a third frame length is smaller than a fourth frame length. This pre-arranged frame length sequence provides error protection against noise and fading by creating predictable patterns that are more resistant to transmission errors

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If conventional error correction methods (block coding or convolutional coding) are applied, then error detection and correction capabilities are provided, but they fail to address the unique error characteristics of frame-length-modulated signals

Engineering Contradiction:

Improveerror detection and correction capabilityVSAvoidadaptability to frame length modulation error characteristics

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by designing error protection specifically tailored to the frame length modulation scheme. Instead of using generic block or convolutional coding, the invention creates a customized error protection mechanism that operates directly on the frame length parameters, making it locally adapted to the specific error characteristics of frame-length-modulated signals

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent inverts the conventional approach by making the frame length itself the primary encoding parameter rather than using separate coding layers. The error protection is integrated into the frame length assignment and arrangement rather than being applied as a separate coding step, fundamentally reversing the traditional error correction architecture

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If trellis coded modulation is used to combine modulation and encoding techniques, then error characteristics are optimized for constant symbol length systems, but it cannot be applied to frame length modulation where symbol length varies

Engineering Contradiction:

Improveerror characteristic optimizationVSAvoidapplicability to variable symbol length systems

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by allowing the frame length to vary dynamically according to the code value being transmitted. Each code in the sequence is assigned different frame lengths, creating a dynamic encoding scheme that adapts to the information being transmitted rather than using a fixed symbol length, thereby extending trellis-coded modulation principles to variable-length frameworks

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9025697B2Transmitter, transmission method used by the same, receiver for receiving a radio signal from transmitter and wireless communication system including the same

Publication Date: 2015.05.05 ATR ADVANCED TELECOMM RES INST INT

AI summary

A transmitter incorporates a table (TBL1) for assigning the frame lengths of 560 μs and 600 μs to the code “0” in a binary system and assigning the frame lengths of 600 μs and 560 μs to the code “1” in the binary system. The transmitter refers to the table (TBL1) and assigns the two frame lengths of 560 μs and 600 μs and the two frame lengths of 600 μs and 560 μs to the codes “0” and “1”, respectively, in the code sequences [0,0], [0,1], [1,0] and [1,1] representing the transmission information “0” to “3” represented using the binary system, and sequentially transmits four radio signals having the assigned four frame lengths.