Spread Spectrum Signal Segmentation for Robust Time Compression

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Solution Overview

Problem

Current data communication systems using time compression are limited in their robustness and efficiency, particularly in voice transmission, and require improvements for practical implementation across various communication techniques.

Innovation Solution

The method involves dividing a message signal into overlapping segments, transmitting them at a higher rate to achieve time compression, and reconstructing the signal at the receiver, which increases robustness and allows for spread spectrum modulation and demodulation, enabling effective communication through time division multiple access (TDMA) and code division multiple access (CDMA) techniques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If time compression is used to transmit message signal at higher sampling rate, then transmission bandwidth is increased, but system robustness against channel impairments deteriorates

Engineering Contradiction:

Improvesampling rateVSAvoidrobustness

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The message signal is divided into multiple overlapping segments, where each segment is transmitted separately. This segmentation allows the system to tolerate channel impairments better, as not all segments need to be perfectly received to reconstruct the original signal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Overlapping segments are prepared in advance with predetermined overlap regions. This preliminary action ensures that even if some segments are corrupted during transmission, the overlapping portions provide redundant information for successful signal reconstruction.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If message signal is divided into overlapping segments with high redundancy, then communication robustness is improved, but transmission rate and productivity deteriorate

Engineering Contradiction:

Improvecommunication robustnessVSAvoidtransmission rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The segments overlap partially rather than completely, providing just enough redundancy to ensure robustness without excessive duplication. This partial overlap strikes a balance between reliability and transmission efficiency.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If exact sample recovery and frame alignment are required, then measurement precision is improved, but device complexity and operation difficulty increase

Engineering Contradiction:

Improvesample recovery accuracyVSAvoidframe alignment overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The overlapping segment structure inherently provides self-alignment capabilities. The predetermined overlap regions enable the receiver to automatically synchronize and reconstruct the signal without requiring complex external frame alignment protocols or overhead.

Inventive Principle:

Principle #25Self-service

4Object-affected harmful factors

If bandwidth is spread by increasing sampling rate, then frequency-selective fading resistance is improved, but energy consumption increases

Engineering Contradiction:

Improveflat fading resistanceVSAvoidenergy consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

By segmenting the signal and transmitting at higher rates, the system achieves frequency diversity that resists flat fading. The segmented approach allows energy to be distributed across multiple segments rather than concentrated in a single high-power transmission.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9479216B2Spread spectrum method and apparatus

Publication Date: 2016.10.25 UVIC INDUSTRY PARTNERSHIPS INC

AI summary

A spread spectrum communications method is based on time compression in which a sampled message signal at a first rate is transmitted at a higher sampling rate. Robustness is achieved by dividing the signal into overlapping segments, transmitting each segment fast enough so that the segments no longer overlap. The segments are received and the data signal reconstructed by overlap-adding the segments.