Signal Interface Unit for Distributed Antenna Noise Floor Optimization
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Solution Overview
Problem
Distributed antenna systems face challenges in efficiently handling and processing channelized signals, which require additional baseband conversion before radio frequency conversion and transmission, leading to complexity and inefficiency in signal handling across multiple antennas and simulcast groups.
Innovation Solution
The implementation of a signal interface unit that translates uplink and downlink signals, adjusts signal attributes, and reports characteristics to make the distributed antenna system appear as a single radio head, allowing for seamless communication with external devices, and includes a distributed switching network to manage and equalize signals across multiple antennas, eliminating the need for additional processing at individual antenna units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If channelized signals are processed through multiple antenna units with individual baseband conversion, then signal coverage is distributed across multiple locations, but system complexity and processing overhead increase significantly
Solution Approach 1:
The patent combines multiple antenna units into a single distributed antenna system that appears as one radio head to external devices. The signal interface unit consolidates signal processing functions, and the distributed switching network aggregates signals from multiple antennas, reducing overall system complexity while maintaining distributed coverage.
Solution Approach 2:
The signal interface unit acts as an intermediary between the distributed antenna units and the external radio head interface. It translates uplink and downlink signals, adjusts signal attributes, and manages the interface to external devices, thereby simplifying the overall system architecture by centralizing complex processing functions.
2Adaptability or versatility
If additional baseband conversion is performed at each antenna unit, then local signal processing capability is enhanced, but processing time and computational overhead increase
Solution Approach 1:
The system performs preliminary signal processing and normalization at the signal interface unit before distribution to antenna units. Delays and gains are equalized in advance, so that individual antenna units do not require additional baseband conversion, thereby reducing processing time while maintaining processing capability.
3Adaptability or versatility
If multiple simulcast groups are supported with individual processing, then system versatility is improved, but signal handling complexity increases
Solution Approach 1:
The signal interface unit and distributed switching network are designed to handle multiple simulcast groups through a single unified interface. The system can simultaneously support multiple groups with different configurations while maintaining a consistent radio head appearance to external devices, thereby achieving versatility without proportionally increasing complexity.
4Ease of manufacture
If distributed antenna units operate independently, then system modularity is improved, but coordination overhead and signal synchronization complexity increase
Solution Approach 1:
The distributed switching network equalizes signal delays and gains across all antenna units, creating a synchronized signal environment. This coordination happens automatically through the network's signal routing and processing, maintaining modular independence while reducing coordination overhead through centralized signal management.
Data Source
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AI summary
A signal interface unit for a distributed antenna system includes a channelized radio carrier interface configured to communicate an uplink channelized radio carrier for a radio frequency carrier to a channelized radio carrier base station interface; an antenna side interface configured to receive an uplink digitized radio frequency signal from the distributed antenna system communicatively coupled to the antenna side interface; and a signal conversion module communicatively coupled between the channelized radio carrier interface and the antenna side interface and configured to convert between the uplink digitized radio frequency signal and the uplink channelized radio carrier at least in part by adjusting at least one uplink attribute of the uplink digitized radio frequency signal received from the distributed antenna system to comply with requirements of the channelized radio carrier base station interface.