Harmonic Modulation FDMA for Spectrum Utilization
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Solution Overview
Problem
Conventional frequency division multiple access communication methods waste frequency spectrum resources by only using fundamental frequencies for information transmission and requiring separate frequency channels for each user, leading to inefficiencies as demand for frequency spectrum exceeds supply, especially in the 5G era.
Innovation Solution
A frequency division multiple access communication method utilizing harmonic modulation technology, where the total frequency band is divided into non-overlapping information channels, with user signals distinguished by frequency, allowing duplex communication using fundamental frequencies and harmonics, enabling multiple information channels to be shared simultaneously without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional frequency division multiple access communication method divides transmission frequency band into narrow non-overlapping sub-bands with sufficient spacing, then interference between users is prevented, but frequency spectrum utilization is severely wasted
Solution Approach 1:
The patent transitions from using only fundamental frequencies to utilizing both fundamental frequencies and their harmonic components. By adding this frequency dimension (harmonics), the system can accommodate multiple users in the same fundamental frequency channel without interference, thus resolving the contradiction between interference prevention and spectrum utilization.
Solution Approach 2:
The patent segments the frequency spectrum by dividing it into fundamental frequency channels and their corresponding harmonic components. Each user is assigned a unique combination of fundamental frequency and harmonic order, creating segmented usage patterns that prevent interference while maximizing spectrum utilization.
2Device complexity
If only fundamental frequency is used for information transmission in conventional FDMA, then system implementation is simple, but frequency spectrum resources are severely insufficient for 5G era demands
Solution Approach 1:
The patent changes the frequency parameter by introducing harmonic components (integer multiples of fundamental frequency) into the transmission spectrum. This parameter expansion allows the system to utilize previously unused frequency resources while maintaining a relatively simple implementation through standard modulation and filtering techniques.
3Measurement precision
If each user is assigned a fixed sub-band with sufficient spacing in conventional FDMA, then user signals are clearly distinguished, but the same frequency channel cannot serve multiple users simultaneously
Solution Approach 1:
The patent makes the fundamental frequency channel universal by allowing it to serve multiple users simultaneously through different harmonic components. Each user shares the same fundamental frequency channel but is distinguished by their unique harmonic order, enabling one frequency channel to perform multiple user communication functions.
Data Source
AI summary
A method is disclosed that divide a total frequency band of a communication system into several equally spaced non-overlapping information channels, which are allocated to different users; the information channels are in one-to-one correspondence with the users; user signals from different addresses are distinguished based on frequency, thereby completing the multiple access connection; and duplex communication between two users uses a fundamental frequency and harmonics for information transmission. A process of the information transmission is as follows: different information is first modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components or component combinations so that each pair of information channels can transmit N groups of different information at the same time, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the transmitted information.