Non-Orthogonal Satellite Transmission via Power Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing satellite communication methods, such as orthogonal multiple access techniques, are not discreet and face challenges with access times to radio resources, especially for carriers with small antennas and high mobility, as they require synchronization and dedicated frequency/time slots, which is not suitable for discreet and efficient transmission.
Innovation Solution
A non-orthogonal multiple access method using power multiplexing, where a discrete signal is transmitted under a higher power signal, allowing for quick allocation of radio resources without synchronization, using a radio resource allocator to identify suitable frequency bands and power levels for transmission, enabling efficient and discreet communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If orthogonal multiple access techniques (FDMA, TDMA, CDMA) are used, then reception is simplified and resources are organized, but access time to radio resources increases significantly due to synchronization requirements and resource allocation signaling exchanges
Solution Approach 1:
The patent extracts the discrete signal transmission from the orthogonal multiple access framework, allowing carriers to transmit without participating in synchronization procedures or resource allocation signaling. Carriers can independently transmit discreetly in any available frequency band without waiting for network coordination, thus eliminating access time delays while maintaining reception simplicity through the satellite's ability to handle non-orthogonal signals.
Solution Approach 2:
The satellite acts as an intermediary that receives both orthogonal signals from network equipment and non-orthogonal discreet signals from carriers, then relays them to destinations. This intermediary capability allows carriers to bypass synchronization requirements while the satellite manages the complexity of separating and processing mixed orthogonal and non-orthogonal signals.
2Adaptability or versatility
If carriers with small antennas are used, then mobility and deployment flexibility are improved, but beam concentration capability deteriorates requiring signal spreading in frequency band
Solution Approach 1:
The patent transitions from spatial dimension (beam concentration) to frequency dimension for signal transmission. Instead of relying on small antennas to concentrate beams spatially, carriers spread their signals across frequency bands, and the satellite performs frequency-based processing to achieve the desired signal concentration and separation, thus compensating for the limited spatial focusing capability of small antennas.
Solution Approach 2:
The patent changes the transmission parameter from spatial beamforming to frequency domain signal processing. By allowing signals to occupy different frequency bands and using the satellite's frequency processing capabilities, the system compensates for the reduced beam concentration of small antennas, enabling mobile carriers to achieve effective communication without large antenna apertures.
3Reliability
If discreet transmission is implemented using frequency evasion or spread spectrum, then anti-interference and anti-jamming capabilities are improved, but spectral occupancy requirements become more stringent
Solution Approach 1:
The patent merges discreet transmission capabilities with conventional orthogonal multiple access signals by allowing carriers to transmit in frequency bands occupied by other carriers or network equipment. The satellite combines these non-orthogonal signals with orthogonal signals from network equipment, enabling discreet transmission without requiring dedicated spectral resources, thus reducing overall spectral occupancy while maintaining anti-interference capabilities through power multiplexing and SIC.
4Loss of time
If power multiplexing with higher power conventional signals is used, then discreet transmission is achieved and access time is reduced, but signal separation complexity increases at the receiver
Solution Approach 1:
The satellite serves as an intermediary that performs signal separation using Successive Interference Cancellation (SIC). Instead of requiring receiving equipment to implement complex SIC algorithms, the satellite receives the power-multiplexed signals, separates the discreet carrier signals from conventional signals using SIC, and relays the separated signals to destinations, thus reducing receiver complexity while maintaining rapid access benefits.
Solution Approach 2:
The patent creates a simplified reception path by having the satellite create copies of the separation function. The satellite performs the complex signal separation operation and provides simplified relay signals to receivers, effectively copying the SIC functionality at the satellite level rather than requiring it at every receiver, thus reducing overall system complexity.
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
Method of transmitting a discrete signal between a second (222) and a third (213, 223) piece of equipment in a satellite network comprising a satellite (201), a first piece of equipment (212), a controller (211) of the transmissions of the first piece of equipment and a radio resource allocator (202), the method comprising: - the collection (301) of information relating to a quality of the signals received by the third piece of equipment (213, 223), - the notification (302) of a need to transmit the discrete signal, - the identification (303) of at least one frequency band (B1, B5) suitable for the transmission of the discrete signal by power multiplexing with at least one signal transmitted by a first piece of equipment (212), and of calculation of an associated transmission power level, and - the transmission (304) of the frequency band and associated power level to the second (222) and third (213, 223) pieces of equipment. Suitable devices for implementing the process.