Wideband Transceiver Reduces RF Chain Count
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Solution Overview
Problem
The increasing demand for capacity in satellite communication systems, particularly with low-earth-orbit (LEO) satellite constellations, results in a need for gateways to support multiple satellites, leading to a large number of required RF chains, which are expensive to build and operate.
Innovation Solution
A gateway system with a wideband transceiver that interfaces with Internet Protocol encapsulators (IPEs) and frame processors (FPs) using digital interfaces over Ethernet-based LANs, allowing for efficient transmission and reception of wideband signals, thereby reducing the number of RF chains needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gateway supports multiple LEO satellites with high capacity requirements, then the communication capacity and coverage are improved, but the number of RF chains increases significantly leading to higher cost and complexity
Solution Approach 1:
The patent combines multiple RF chains into a single wideband RF chain that can handle multiple satellites simultaneously. The wideband transceiver integrates frequency-selective combining and digital beamforming capabilities to process signals from multiple satellites through one RF chain, reducing the number of physical RF chains from multiple to a single unit while maintaining support for multiple LEO satellites.
Solution Approach 2:
The wideband RF chain is designed with universal functionality to serve multiple satellites and communication functions simultaneously. It incorporates flexible frequency-selective combining and digital beamforming that can adapt to different satellite positions, frequencies, and communication requirements, allowing one RF chain to perform the work of multiple dedicated RF chains.
2Device complexity
If the number of RF chains is reduced to lower cost and complexity, then the system becomes more cost-effective, but the capacity to support multiple satellites simultaneously is limited
Solution Approach 1:
Multiple satellite signals are combined within a single wideband RF chain using frequency-selective combining techniques. The system merges signals from different satellites in the frequency domain, allowing one RF chain to simultaneously process multiple satellite communications that would traditionally require separate RF chains.
Solution Approach 2:
The patent transitions from spatial separation of RF chains to frequency-domain separation and combining. Instead of using multiple physical RF chains separated in space, the system uses frequency-selective combining to separate and process multiple satellite signals in the frequency domain, then combines them digitally, achieving multi-satellite support with a single RF chain.
3Length of stationary object
If wideband signals are transmitted over long distances via RF cables, then the transmission distance is improved, but RF cable attenuation at high frequencies becomes excessive
Solution Approach 1:
The patent introduces an intermediary digital processing stage between the antenna and the RF cable. The wideband transceiver performs frequency-selective combining and digital beamforming in the digital domain, converting the signal processing from the RF domain to the digital domain. This intermediary approach allows long-distance transmission without relying on low-loss RF cables for the entire path.
Data Source
AI summary
A wideband transceiver for a gateway is presented. The wideband transceiver may interface with the gateway's processors over an interface that carries data encapsulated in baseband frames. The wideband transceiver may comprise a modulator and a high power amplifier and may improve a transmitted signal quality and may utilize a wideband for wireless communications, for example, for a satellite communication system.