Wideband Remote Radio Head Amplifier With Interference Cancellation
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Solution Overview
Problem
Conventional remote radio head units (RRUs) are power-inefficient, costly, and inflexible, particularly when operating with multiple frequency bands, as they struggle with signal isolation between transmitters and receivers, leading to inefficiencies and increased mechanical housing requirements.
Innovation Solution
The implementation of a hybrid system using a single wideband power amplifier, combined with duplexers, switches, and an Interference Cancellation System (ICS), which maximizes isolation between transmitter and receiver signals, allowing for multi-band and multi-channel operations while reducing the number of power amplifiers needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power amplifiers are used for multi-band operation, then signal isolation between transmitters and receivers is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple frequency band processing into a single wideband power amplifier that can handle multiple bands simultaneously. The hybrid system merges digital signal processing with analog RF processing, allowing one power amplifier to perform the function of multiple separate amplifiers while maintaining signal isolation through digital techniques and filtering.
Solution Approach 2:
The patent introduces an interference cancellation system that acts as an intermediary between the wideband power amplifier and the receiver. This system includes a coupler, variable attenuator, phase shifter, and adaptive algorithm that actively cancel interference signals, enabling single amplifier multi-band operation without compromising receiver performance.
2Device complexity
If a single wideband power amplifier is used for multi-band operation, then device complexity is reduced, but signal isolation between transmitter and receiver deteriorates
Solution Approach 1:
The interference cancellation system serves as a mediator that restores signal isolation performance. It continuously monitors the wideband amplifier output, generates cancellation signals through adaptive processing, and injects these into the receiver path to neutralize interference, thereby maintaining isolation equivalent to multiple amplifier systems.
Solution Approach 2:
The system dynamically adjusts parameters including variable attenuation levels, phase shifts, and adaptive filtering characteristics to optimize interference cancellation across different frequency bands and operating conditions, maintaining signal isolation performance while using a single wideband amplifier.
3Reliability
If conventional multi-channel RRU architecture is used, then signal isolation is maintained, but power efficiency and flexibility deteriorate
Solution Approach 1:
The patent merges multiple channel processing functions into a single wideband power amplifier with digital channel separation. Instead of running multiple separate amplifier channels, the system uses one efficient wideband amplifier controlled by digital signal processing, reducing overall power consumption while maintaining isolation through the interference cancellation system.
4Adaptability or versatility
If multiple power amplifiers are deployed for multi-band support, then frequency band coverage is improved, but manufacturing cost increases
Solution Approach 1:
The wideband power amplifier is designed as a universal component that can operate across multiple frequency bands. This single multi-functional amplifier replaces multiple band-specific amplifiers, reducing component count, simplifying manufacturing, and lowering overall system cost while maintaining multi-band coverage capability through digital configuration and interference cancellation.
Data Source
AI summary
A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifiers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and/or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.