Continuous Phase Shift Keying Modulation for Bandwidth and Power Efficiency
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Solution Overview
Problem
Current wireless communication technologies, such as BLE 2M GFSK and classical phase shift keying modulation, face challenges with low bandwidth efficiency, high power consumption, and poor anti-multipath ISI performance due to phase mutation and high peak-to-average power ratio, leading to increased complexity and inefficiency.
Innovation Solution
A phase shift keying modulation method that avoids phase mutation by continuously changing the phase, reducing out-of-band spectrum and improving spectrum efficiency while maintaining constant envelope modulation characteristics with low complexity and high power amplification efficiency, using a phase function to map binary data into a phase sequence and modulate it into a continuous phase signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If classical phase shift keying modulation (DQPSK) is used, then bandwidth efficiency is improved, but signal amplitude fluctuates greatly and peak-to-average power ratio increases due to phase mutation
Solution Approach 1:
The patent applies continuous phase modulation where the phase changes dynamically and continuously rather than abruptly. The phase transition is controlled to be continuous across symbol boundaries, eliminating the sudden phase mutations in traditional DQPSK while maintaining the bandwidth efficiency benefits of phase shift keying.
Solution Approach 2:
The patent changes the modulation parameter from discrete phase jumps to continuous phase evolution. By controlling the phase to change continuously rather than in discrete steps, the signal maintains more stable amplitude characteristics while still achieving effective data transmission through phase variations.
2Use of energy by moving object
If BLE 2M GFSK modulation is used, then power efficiency is improved with constant envelope, but bandwidth efficiency decreases and anti-multipath ISI performance deteriorates
Solution Approach 1:
The patent creates a modulation scheme that combines the advantages of both GFSK and DQPSK. It achieves the constant envelope property of GFSK (good for power efficiency) while incorporating the phase modulation principles of DQPSK (good for bandwidth efficiency), making the system multi-functional in terms of performance characteristics.
Solution Approach 2:
The patent essentially creates a composite modulation technique that blends frequency modulation aspects (from GFSK) with phase modulation aspects (from DQPSK). This composite approach allows the system to inherit the power efficiency of constant envelope modulation while achieving the bandwidth efficiency of phase shift keying.
3Productivity
If phase mutation is used in phase shift keying modulation, then data transmission efficiency is improved, but out-of-band spectrum increases and anti-multipath ISI performance worsens
Solution Approach 1:
The patent transitions from static, abrupt phase changes to dynamic, continuous phase evolution. The phase is modulated to change smoothly over time rather than jumping instantaneously, which reduces spectral spreading while maintaining the ability to encode data efficiently through phase variations.
Data Source
AI summary
The present invention provides a phase shift keying modulation method and a corresponding modulator, a phase shift keying demodulation method and a corresponding demodulator. The phase shift keying modulation method comprises: mapping a binary data stream to be modulated into a phase sequence comprising one or more phase symbols according to a predetermined phase shift keying modulation mode; modulating the phase symbol with a preset phase function to obtain a phase signal that changes continuously with time, wherein in each symbol cycle, a difference between a value of the phase signal at a beginning of the symbol cycle and a value of the phase signal at an end of the symbol cycle is equal to the phase symbol modulated in the symbol cycle; and obtaining a radio frequency signal by modulation based on the phase signal.