Multibeam Satellite Transmitter Scheduling Same-Frequency Reuse
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Solution Overview
Problem
Conventional multibeam satellite communication systems face interference issues in overlap regions, leading to decreased throughput due to the use of different frequencies in adjacent beams, which reduces resource utilization and overall system efficiency.
Innovation Solution
A transmitter and transmission method that utilize a scheduler to determine the time and wireless channel for data transmission based on the receiver's location, allowing signals to be transmitted at the same frequency across multiple beams, thereby reducing interference and improving throughput by coordinating multipoint transmission and scheduling data transmission to avoid overlap regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If different frequencies are used in adjacent beams to suppress interference, then interference in overlap regions is reduced, but frequency usage efficiency decreases and throughput is reduced
Solution Approach 1:
The patent implements time-division multiplexing where beams alternately transmit signals in periodic time slots. Beam 1 transmits in odd time slots while Beam 2 transmits in even time slots, creating a periodic transmission pattern that eliminates interference in overlap regions while maintaining high frequency usage efficiency through same-frequency reuse
Solution Approach 2:
The patent dynamically assigns transmission rights to different beams based on time slot conditions. The transmission system adaptively controls which beam transmits in each time slot, allowing flexible resource allocation that maximizes throughput while preventing interference, rather than using static frequency assignment
2Productivity
If same frequency is used across multiple beams to improve frequency usage efficiency, then throughput increases, but interference occurs in overlap regions
Solution Approach 1:
The patent uses periodic time-division multiplexing where same frequency is reused across beams in different time periods. Beam 1 uses frequency f1 in odd slots while Beam 2 uses frequency f2 in even slots, enabling same-frequency reuse for improved throughput while periodic time separation prevents interference in overlap regions
Solution Approach 2:
The patent maintains continuous transmission across all time slots by having different beams transmit in alternating slots. This ensures the communication system operates continuously without idle time, maximizing resource utilization while the time-division scheme prevents interference, achieving both high throughput and interference suppression
3Object-affected harmful factors
If conventional interference suppression measures are employed, then interference in overlap regions is reduced, but resource utilization decreases and overall system efficiency is reduced
Solution Approach 1:
The patent implements periodic time-division multiplexing that allows same-frequency reuse across beams in different time slots, achieving interference suppression without requiring additional frequency resources. This approach maximizes resource utilization by reusing existing frequencies temporally rather than allocating separate frequencies spatially
Solution Approach 2:
The patent changes the time parameter of transmission by introducing time-division multiplexing with alternating time slots for different beams. This parameter change enables same-frequency reuse while maintaining interference suppression, improving resource utilization compared to conventional static frequency assignment methods
Data Source
AI summary
A transmitter communicates with a receiver via a satellite station that transmits a signal by a multibeam system. The transmitter includes a scheduler and a transmission unit. The scheduler performs scheduling to determine a time and a wireless channel to transmit data addressed to the receiver based on an area where the receiver is present. The transmission unit transmits a signal of the data addressed to the receiver to the satellite station by the wireless channel determined by the scheduler and at the time determined by the scheduler. The signal transmitted from the transmission unit by an i-th (i is an integer of 1 or larger) wireless channel is transmitted from the satellite station to the receiver by an i-th beam. Frequencies of signals transmitted from the satellite station by respective beams are same.