Pseudo Noise Generator Synchronization Preamble

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Solution Overview

Problem

In secure communication systems, especially in military contexts, the need arises to minimize RF emissions during preamble synchronization while maintaining robust and secure communication, as longer preamble sequences require increased transmit power and time-bandwidth, making them detectable and inefficient.

Innovation Solution

A system and method utilizing a pseudo noise generator to create a non-predictable pseudo-random algorithm for generating a synchronization preamble by concatenating short gold sequences, which reduces energy accumulation time and minimizes RF emissions, comprising a transmitter with a PN generator and a receiver for decryption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If longer preamble sequences are transmitted to compensate for lack of orthogonality, then synchronization confidence and false alarm rate are improved, but transmit power and time-bandwidth consumption increase

Engineering Contradiction:

Improvesynchronization confidenceVSAvoidtransmit power

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments the preamble sequence into multiple shorter orthogonal sequences instead of using one long non-orthogonal sequence. This segmentation maintains synchronization confidence while reducing the total length and associated power consumption. The receiver processes these segmented sequences individually, achieving reliable synchronization without requiring increased transmit power.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter of sequence length from long to short, and compensates by changing the orthogonality parameter from non-orthogonal to orthogonal. This parameter transformation allows the system to maintain or improve synchronization performance while reducing the time-bandwidth product and transmit power requirements.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If longer preamble sequences are transmitted to compensate for lack of orthogonality, then synchronization confidence and false alarm rate are improved, but time-bandwidth consumption increases

Engineering Contradiction:

Improvefalse alarm rateVSAvoidtime-bandwidth

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent divides the synchronization preamble into multiple short orthogonal sequences, each contributing to the overall detection reliability. The segmentation allows the receiver to process multiple independent sequences, improving false alarm rate through statistical combining while keeping each individual sequence short, thus minimizing total time-bandwidth consumption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite synchronization structure by combining multiple short orthogonal sequences. This composite approach leverages the mathematical properties of orthogonality to achieve high detection reliability and low false alarm rates without requiring a single long sequence, thereby optimizing time-bandwidth efficiency.

Inventive Principle:

Principle #40Composite materials

3Reliability

If increased transmit power is used to communicate over significant distances, then communication reliability is improved, but detection likelihood by hostile forces increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsignal detection by hostile parties

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the efficiency parameter of the transmission system by implementing orthogonal sequences that maximize information transfer per unit of time-bandwidth. This improved efficiency allows the system to achieve reliable communication at lower transmit power levels, thereby reducing the probability of detection by hostile forces while maintaining communication reliability over significant distances.

Inventive Principle:

Principle #35Parameter changes

4Speed

If increased transmit power is used to communicate over significant distances, then communication range is improved, but battery consumption increases

Engineering Contradiction:

Improvecommunication rangeVSAvoidbattery consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent optimizes the time-bandwidth parameter by using short orthogonal sequences, which improves transmission efficiency. This efficiency gain allows the system to extend communication range without proportionally increasing transmit power, thereby significantly reducing battery consumption while maintaining or improving communication range for distant devices.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7843988B1System and method for pre-processing transmission sequences in a jammed environment

Publication Date: 2010.11.30 ROCKWELL COLLINS INC

AI summary

A system for pre-processing transmission sequences in a jammed environment. System a transmitter suitable for transmitting the synchronization preamble further comprising a pseudo noise generator suitable for running a non predictable pseudo random algorithm. Pseudo random algorithm is suitable for generating a codeword operable as a pointer indexed into a table of gold sequences. Pointer is suitable for selecting a pseudo random selection of gold sequences from the table of gold sequences. Pseudo random selection of gold sequences forms a synchronization preamble. Gold sequences are concatenated together to form the synchronization preamble. System further comprises a receiver configured to receive the transmitted synchronization preamble further comprising of a decryption key suitable for decrypting received synchronization preamble.