Spectral Network Device for RF Transport Over IP
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Solution Overview
Problem
Current access networks face bottlenecks in delivering large bandwidth to end users due to limited bandwidth capacity, necessitating a mechanism for deterministic and faithful transportation of multi-band RF spectrum over digital networks.
Innovation Solution
The implementation of a spectral network system that converts RF signals into Internet Protocol (IP) packets, preserves timing, and uses Packet Forward Error Correction (P-FEC) to ensure reliable and efficient transport, minimizing network bandwidth and latency, while enabling seamless switching and automatic failover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If RF signals are transported over current access networks, then bandwidth delivery is attempted, but network bandwidth capacity is limited causing bottlenecks
Solution Approach 1:
The RF spectrum is divided into multiple sub-channels through FFT processing, allowing selective transport of only the necessary bandwidth portions. This segmentation enables efficient use of network resources by transmitting only the required spectral components rather than the entire RF bandwidth.
Solution Approach 2:
The system dynamically adjusts the bandwidth allocation and spectral parameters based on network conditions and service requirements. By changing parameters such as sub-channel bandwidth, sampling rates, and spectral occupancy, the system optimizes the trade-off between bandwidth capacity and data delivery efficiency.
2Adaptability or versatility
If RF signals are converted to IP packets for transport, then network flexibility is improved, but timing precision and signal fidelity may deteriorate
Solution Approach 1:
Timestamps are generated at the source before packet transmission to record the exact timing of each RF sample. This preliminary timing documentation allows the receiver to reconstruct the original timing relationships, compensating for network transmission delays and maintaining signal fidelity despite IP packetization.
Solution Approach 2:
The system uses timing feedback mechanisms where the receiver measures actual packet arrival times and compares them with the embedded timestamps. This feedback enables dynamic adjustment of timing compensation parameters to maintain precision even under varying network conditions.
3Quantity of substance
If spectral channels are extracted and transported separately, then bandwidth efficiency is improved, but system complexity increases
Solution Approach 1:
The spectral network device performs multiple functions including FFT processing, sub-channel extraction, packetization with timestamps, and timing compensation using a unified architectural framework. This multi-functionality reduces overall system complexity by consolidating operations that would otherwise require separate processing stages.
Solution Approach 2:
The system creates digital copies of the RF spectral content in the form of IP packets containing FFT coefficients, rather than transporting the actual RF signals. This copying approach enables efficient bandwidth utilization while managing complexity through standardized digital signal representation and processing.
4Reliability
If timing is preserved through timestamping, then signal fidelity is improved, but network overhead increases
Solution Approach 1:
Timestamps are applied selectively to only those spectral sub-channels that require precise timing reconstruction, rather than to all transmitted data. This partial application of timestamping reduces overhead while maintaining signal fidelity for the critical components that require it.
Data Source
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AI summary
Means for transporting multi-band RF spectrum over a digital network including: means for converting radio frequency signal into internet protocol packets; means for time stamping and preserving timing for the converted radio frequency signal; and means for transporting the radio frequency signal using a radio transport standard.