Spatially-Distributed Interferometer Receiver for 5G Backhaul
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Solution Overview
Problem
Conventional six-port direct conversion receivers suffer from dynamic range loss due to their interferometric scheme, which increases with operating frequency, requiring additional gain for antennas and power amplifiers, and are energy and cost inefficient for high-data-rate wireless communications in 5G systems.
Innovation Solution
A spatially-distributed multi-input interferometry receiver processes multiple phased versions of RF signals using low-power components, with each version passing through a single power coupler before being detected, eliminating power loss and enabling direct recovery of baseband symbols without frequency down-conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional six-port interferometer receiver is used, then the receiver architecture is compact and low-cost, but the dynamic range suffers from at least 6 dB loss
Solution Approach 1:
The receiver is divided into multiple spatially-distributed antenna elements (at least two antennas) that receive different phased versions of the RF signal. Each antenna element processes the signal independently through its own power coupler and detector, allowing the system to segment the interferometric measurement across multiple spatial paths rather than forcing all measurements through a single six-port structure.
Solution Approach 2:
The invention transitions from a conventional single-point six-port interferometer to a spatially-distributed multi-antenna system. By adding the spatial dimension with multiple antennas positioned at different locations, the system can capture multiple phased versions of the same RF signal and process them through separate interferometric paths, thereby recovering dynamic range while maintaining the compact interferometer architecture.
2Speed
If operating frequency increases, then the data rate capability improves, but the receiver losses increase and dynamic range decreases
Solution Approach 1:
The receiver segments the high-frequency signal processing across multiple antenna elements, with each element handling a portion of the phased signal versions. This segmentation allows the system to process high-frequency signals through multiple parallel paths rather than a single lossy path, mitigating the cumulative losses that occur at higher operating frequencies.
Solution Approach 2:
The invention merges the outputs from multiple spatially-distributed antenna elements and their respective power detectors. By combining the detected power measurements from multiple phased signal versions received at different antenna locations, the system achieves better signal-to-noise ratio and compensates for frequency-dependent losses in individual paths.
3Measurement precision
If additional gain is provided for antennas and power amplifiers to compensate for losses, then the dynamic range is maintained, but the energy consumption increases
Solution Approach 1:
The spatially-distributed antenna system utilizes the natural phase differences of the RF signal as received at different spatial locations. Each antenna element passively captures a phased version of the signal, and the system processes these natural variations through power detection and computational interferometry, eliminating the need for active amplification and associated energy consumption.
Solution Approach 2:
The invention replaces the conventional approach of using active power amplifiers and gain stages to compensate for losses with a passive computational approach. Instead of amplifying weak signals through energy-consuming hardware, the system uses multiple spatial paths to naturally obtain sufficient signal power at the detectors, then recovers the dynamic range through digital signal processing of the detected power measurements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the dynamic range and reduces energy consumption and costs, making it suitable for high-data-rate wireless communications in 5G systems by directly recovering baseband symbols from RF signals with improved efficiency.
Implementation Method 1
a differentiator circuit connected to the power coupler outputs for determining a power differential between at least one pair of the coupled signals
Data Source
AI summary
A receiver for receiving a radio frequency (RF) signal that comprises a carrier signal modulated with a baseband symbol. The receiver includes a plurality of spatially-distributed antennas to receive the RF signal; a local reference signal generator configured to generate a local reference signal; a plurality of power couplers, each power coupler having a first input connected to a respective one of the antennas to receive a respective version of the RF signal, a second input connected to the local reference signal generator to receive the local reference signal, and an output to output a corresponding coupled signal; and a differentiator circuit connected to the power coupler outputs for determining a power differential between at least one pair of the coupled signals to recover the baseband symbol from the RF signal.