Length Shift Keying Modulation for Constant Power Data Transmission
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Solution Overview
Problem
Existing communication systems using modulation methods like ASK, FSK, and PSK increase carrier signal power, leading to complex receiver hardware and increased manufacturing costs due to the need for structural changes to accommodate different modulation methods.
Innovation Solution
A communication system employing Length Shift Keying (LSK) modulation, where the transmitter adjusts carrier signal lengths in the time domain based on data bits, maintaining constant carrier signal power and allowing for simple receiver construction by using a modulator that sets specific lengths for data bits, and a receiver that integrates energy values to judge data bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If ASK, FSK, or PSK modulation methods are used to modulate carrier signal, then data transmission capability is improved, but carrier signal power increases and receiver hardware complexity increases
Solution Approach 1:
The patent changes the modulation parameter from amplitude/frequency/phase to time duration. By varying the length of carrier signals (time domain parameter) instead of changing amplitude, frequency, or phase, the system achieves data transmission without increasing carrier signal power, thus resolving the contradiction between data transmission capability and power consumption
2Loss of information
If ASK, FSK, or PSK modulation methods are used to modulate carrier signal, then data transmission capability is improved, but receiver hardware complexity and manufacturing cost increase
Solution Approach 1:
The patent simplifies receiver hardware by changing the modulation parameter to time duration. The receiver only needs to measure the duration of received carrier signals using a timer, eliminating the need for complex amplitude detection, frequency discrimination, or phase measurement circuits required by ASK, FSK, and PSK systems
Solution Approach 2:
The patent replaces complex electronic measurement systems with a simple timing mechanism. Instead of using complex hardware circuits to detect amplitude, frequency, or phase variations, the system uses a timer to measure signal duration, significantly simplifying the receiver hardware architecture
3Reliability
If carrier signal power is increased to improve reception, then receiver capacity should be increased, but this increases system complexity and cost
Solution Approach 1:
The patent maintains constant carrier signal power while achieving reliable data transmission by encoding information in the time duration of signals. The receiver measures duration rather than power level, allowing reliable reception without requiring high-power transmission or high-capacity receiver hardware
Data Source
AI summary
A communication system using a length shift keying (LSK) modulation method provides a transmitter having a carrier signal generator for generating carrier signals, and a modulator for modulating lengths of the carrier signals from the carrier signal generator according to combinations of data bits, and a receiver having an integrator for calculating an energy value by integrating the carrier signal that corresponds to a data bit combination, and a data judgment unit for judging the data bit combination by comparing the energy value with a predetermined threshold value. Power is maintained without changing the bandwidth of a communication signal when the communication signal is modulated.