Interference Cancellation for MIL-STD-1553 Overlay Networks
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Solution Overview
Problem
The existing MIL-STD-1553 communication system faces inefficiencies due to interference from 1553 signals on non-1553 signals in overlay networks, limiting data throughput and requiring complex and costly rewiring for bandwidth expansion in military and commercial aircraft.
Innovation Solution
An interference cancellation system and method that extracts 1553 data from sampled primary signals, measures interference, and subtracts it to produce an output signal with reduced 1553 component, allowing non-1553 signals to operate efficiently without rewiring by using an input port, 1553 data extraction block, and interference cancellation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM overlay network is implemented on existing 1553 bus, then data throughput is increased, but 1553 sidelobes interfere with OFDM signals limiting throughput
Solution Approach 1:
The patent extracts 1553 decoded data from the composite signal and uses it to generate an interference signal that replicates the harmful 1553 sidelobes. By subtracting this generated interference signal from the received signal, the system converts the harmful interference into a removable component, effectively canceling it and improving OFDM throughput.
Solution Approach 2:
The patent implements a 1553 data extraction block that separates and extracts the 1553 encoded data component from the composite signal containing both 1553 and OFDM signals. This extracted 1553 data is then used to generate an interference signal for cancellation, effectively removing the harmful sidelobe interference from the OFDM reception path.
2Adaptability or versatility
If rewiring is performed to add new equipment, then bandwidth capacity is expanded, but complexity and cost increase substantially
Solution Approach 1:
The patent enables the existing 1553 bus infrastructure to serve dual purposes: maintaining its original 1553 communication function while simultaneously carrying OFDM overlay signals for high-speed data transfer. This multi-functionality allows bandwidth expansion without adding new physical wiring, as the same bus handles both legacy and modern communication needs.
Solution Approach 2:
The patent introduces signal processing blocks (extractor, interference generator, canceller) as intermediaries that enable OFDM communication over the 1553 bus without physical rewiring. These intermediary processing stages allow the system to overcome the limitations of the legacy bus infrastructure while maintaining compatibility with existing wiring.
3Reliability
If 1553 signaling is maintained for legacy compatibility, then existing systems continue to operate, but interference limits non-1553 signal performance
Solution Approach 1:
The patent creates a feedback loop where 1553 decoded data from the received signal is fed back into an interference signal generator. This generated interference signal is then subtracted from the received signal to cancel the harmful 1553 sidelobes. This feedback mechanism continuously adapts to the actual 1553 signal conditions and removes their interference effect on OFDM communication.
Data Source
AI summary
An interference cancellation system and method for a communication system comprising a data bus carrying primary signals having an A component and a non-A component are provided. The interference cancellation system has an input port, an A data extraction block and an interference cancellation circuit. The input port receives a sampled primary signal from the data bus, via an analog-front end block having sampling means. The A data extraction block extracts A data from the sampled primary signal and outputs A decoded data. The interference cancellation circuit has an interference measurement block and a cancellation block. The interference measurement block receives the A decoded data and the sampled primary signal and produces an A interference signal. The cancellation block receives the sampled primary signal and the A interference signal and subtracts the A interference signal from the sampled primary signal, producing an output signal with the A component substantially attenuated.