Multicarrier Terahertz Transmission Using Zero-Offset Channel Separation
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Solution Overview
Problem
Existing multi-channel wireless transmission technologies for terahertz signals are limited by the need for separate multiplexers and demultiplexers, which restrict channel reception and increase system size and cost, while demanding high-speed data transmission and low latency in terahertz bands.
Innovation Solution
A method and apparatus for generating and separating multicarrier terahertz signals by controlling zero level offsets differently for each channel without using a separate multiplexer or demultiplexer, utilizing laser diodes, optical modulators, and histogram filtering for simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate multiplexers and demultiplexers are used for multi-channel wireless transmission, then channel separation is achieved, but system size and cost increase
Solution Approach 1:
The patent merges the functions of multiplexer and demultiplexer into a single integrated device. The multiplexer combines multiple channels into one signal for transmission, while the demultiplexer separates received signals by channel, both functions being implemented in one device without requiring separate components. This reduces system size and cost while maintaining channel separation capability.
Solution Approach 2:
The integrated device performs multiple functions: it acts as both a multiplexer for transmitting multiple channels and a demultiplexer for separating received channels. The device can handle both transmission and reception operations, making it a universal component that replaces multiple specialized devices.
2Measurement precision
If mixers are used to separate signals by heterodyne beating, then channel separation is achieved, but the number of receivable channels is limited by antenna coverage and oscilloscope bandwidth
Solution Approach 1:
The patent replaces the traditional mixer-based heterodyne beating method with an integrated device that uses optical filtering and signal processing techniques. This substitution eliminates the limitations of antenna coverage and oscilloscope bandwidth, allowing the system to receive and separate a much larger number of channels simultaneously without being constrained by conventional hardware limitations.
3Measurement precision
If channels are separated sequentially by changing local signal frequency, then channel separation is achieved, but real-time service and high-speed data transmission are compromised
Solution Approach 1:
The patent implements simultaneous multi-channel separation instead of sequential processing. The integrated device can separate multiple channels at the same time using parallel optical filtering and signal processing, enabling continuous real-time service and high-speed data transmission without the delays inherent in sequential channel separation methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances transmission capacity and reduces system cost and volume by allowing simultaneous multicarrier terahertz signal transmission and reception, maintaining eye amplitude and using histogram filtering for precise channel separation.
Implementation Method 1
a plurality of laser diodes (LDs) configured to output optical signals having different carrier frequencies
Implementation Method 2
a plurality of optical modulators configured to optically modulate LD signals output through the LDs
Implementation Method 3
a beating light source configured to provide a local oscillator (LO) signal required to generate terahertz signals through optical beating of the LD signals
Implementation Method 4
generating a multicarrier terahertz signal including the terahertz signals having different carrier frequencies through optical beating of each of the LD signals and the LO signal
Data Source
AI summary
Disclosed are a multicarrier terahertz wireless transmission system and a method for transmitting a multicarrier terahertz signal in the system. A transmitting device in the multicarrier terahertz wireless transmission system comprises: a plurality of laser diodes (LDs) that output optical signals having different carrier frequencies; a plurality of optical modulators that optically modulate LD signals outputted through the LDs; a beating light source that provides a local oscillator (LO) signal needed for generating a terahertz signal through optical beating with the LD signals; and a signal generator that generates a multicarrier terahertz signal composed of terahertz signals having different carrier frequencies through optical beating of each of the LD signals and the LO signal, wherein a zero level offset of each of the terahertz signals having different carrier frequencies may be adjusted differently. The multicarrier terahertz signal may be separated by channel by using features on a histogram of the multicarrier terahertz signal and filtering, by means of a precalculated histogram filter or an adaptive filter using histogram peaks, so that only two peaks are included.