MSK Transceiver OQPSK Translation Circuitry

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Solution Overview

Problem

Existing wireless communication systems face a trade-off between the better sensitivity performance of OQPSK receivers and the simplicity and low cost of MSK receivers, with MSK receivers sacrificing sensitivity for lower complexity.

Innovation Solution

A wireless transmitter is designed to generate binary data bits using circuitry that provides a first and second spreading sequence for each bit, where the second bit is complementary to the first, and each sequence has a same bit value in an integer number of bit positions, allowing for an OQPSK-to-MSK translation that maintains signal integrity and reduces implementation complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If OQPSK modulation is used, then sensitivity performance is improved, but device complexity and cost increase

Engineering Contradiction:

Improvesensitivity performanceVSAvoidreceiver complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies the copying principle by translating OQPSK data into MSK domain. The MSK translator creates a simplified copy of the OQPSK signal that can be processed by simpler MSK receivers, thereby maintaining sensitivity performance while reducing receiver complexity and cost

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent changes the modulation parameter domain by converting OQPSK signals into MSK domain through a translator. This parameter transformation allows the system to achieve OQPSK-level sensitivity with MSK-style receiver simplicity, resolving the contradiction between performance and complexity

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If MSK modulation is used, then device complexity is reduced, but sensitivity performance deteriorates

Engineering Contradiction:

Improvereceiver complexityVSAvoidsensitivity performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces an MSK translator as an intermediary component that bridges OQPSK and MSK domains. This intermediary translates incoming OQPSK signals into MSK domain, enabling simple MSK receivers to achieve improved sensitivity performance without directly implementing complex OQPSK reception architecture

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If bit differential encoding is used in OQPSK, then data transmission is achieved, but noise penalties increase and data accuracy decreases

Engineering Contradiction:

Improvedata transmissionVSAvoiddata accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent extracts and eliminates bit differential encoding from the OQPSK transmission path by translating data into MSK domain. This removal of the differential encoding step eliminates the associated noise penalties and improves data accuracy while maintaining productive data transmission through the MSK translator

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10432439B2MSK transceiver of OQPSK data

Publication Date: 2019.10.01 TEXAS INSTRUMENTS INC

AI summary

A wireless transmitter for transmitting bits to a wireless receiver. The wireless transmitter comprises: (i) circuitry for generating binary data bits; and (ii) circuitry for providing a first spreading sequence for a first bit in the binary data bits and for providing a second spreading sequence for a second bit in the binary data bits, wherein the second bit is complementary to the first bit. Each spreading sequence consists of an integer number N of bits, and the circuitry for providing provides a same bit value in an integer number M of bit positions in the first and second spreading sequences, where M<N.