Transceiver Isolation via Dynamic Beamforming Null-Steering
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Solution Overview
Problem
Modern wireless communication devices face intermodulation distortion due to limited isolation between transmission and reception paths, leading to degraded sensitivity, especially when using multiple duplexers or narrowband antennas that are bulky, expensive, and lossy.
Innovation Solution
A transceiver system employing a spatial filter with separate receiver and transmitter antenna arrays and a beamforming element that dynamically adjusts antenna weights to attenuate signals between antennas, achieving high isolation by creating null angles that reduce signal amplitude in specific directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple duplexers or narrowband antennas are used to achieve high isolation between transmission and reception paths, then isolation performance is improved, but device size, cost, and power consumption increase
Solution Approach 1:
The patent combines multiple antenna elements into a single MIMO antenna array that provides both transmission and reception functions. Instead of using separate duplexers or narrowband antennas for isolation, the system integrates multiple antenna elements that work together to provide spatial isolation through beamforming and null-steering techniques, thereby reducing device complexity while maintaining isolation performance.
Solution Approach 2:
The patent employs dynamic beamforming and null-steering techniques that adaptively adjust the radiation patterns of the MIMO antenna array in real-time. By dynamically controlling the phase and amplitude of signals from multiple antenna elements, the system can steer nulls toward the transmitter during reception and steer beams toward the receiver during transmission, providing adaptive isolation without requiring multiple static duplexers or narrowband antennas.
2Reliability
If a duplexer is used to provide isolation between transmission and reception paths, then frequency separation is achieved, but intermodulation distortion occurs due to signal leakage
Solution Approach 1:
The patent uses dynamic null-steering techniques where the MIMO antenna array adaptively creates nulls in the radiation pattern toward the transmitter during reception operations. This dynamic spatial filtering provides frequency-independent isolation that prevents signal leakage and intermodulation distortion without requiring traditional duplexers that operate at specific frequency pairs.
Solution Approach 2:
Instead of relying solely on frequency separation in the frequency domain, the patent introduces spatial separation in the spatial domain by using multiple antenna elements with different radiation patterns. This dimensional approach allows the system to achieve isolation through spatial null-steering, effectively blocking signal leakage paths and preventing intermodulation distortion regardless of frequency overlap.
3Reliability
If separate narrowband antennas are used for transmission and reception, then isolation is provided, but signal loss increases due to antenna losses
Solution Approach 1:
The patent merges multiple antenna elements into a unified MIMO antenna array that shares common feeding networks and impedance matching circuits. This integration reduces the total number of antenna components and their associated losses, while the cooperative operation of multiple elements provides isolation through spatial processing rather than relying on individual narrowband antenna isolation, thereby reducing overall signal loss.
4Adaptability or versatility
If wideband antennas are used to avoid the limitations of narrowband antennas, then frequency flexibility is improved, but isolation between transmission and reception paths deteriorates
Solution Approach 1:
The patent employs dynamic beamforming and null-steering techniques with the MIMO antenna array that adapt to the specific transmission and reception directions in real-time. This dynamic spatial processing provides frequency-independent isolation that works effectively across wide frequency bands, allowing the system to use wideband antennas for frequency flexibility while maintaining reliable isolation through adaptive spatial filtering rather than relying on frequency-selective narrowband antenna characteristics.
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 approach provides a high degree of isolation between transmission and reception paths, even when frequencies overlap, allowing for the use of wideband antennas and reducing intermodulation distortion, thereby enhancing transceiver performance and efficiency.
Implementation Method 1
A beamforming element is configured to enable beamforming functionality within the transmit antennas so as to attenuate transmitted signals over a null angle comprising the one or more receive antennas
Implementation Method 2
A spatial filter with separate receiver and transmitter antenna arrays and a beamforming element that dynamically adjusts antenna weights to attenuate signals between antennas
Data Source
AI summary
The disclosed invention relates to a transceiver system having one or more receive antennas that receive a first radio frequency (RF) signal and a plurality of transmit antennas that wirelessly transmit a second RF signal. A local channel determination unit provides data corresponding to the environment of local communication channels (i.e., the communication channels between the transmit antennas and the receive antennas) to a beamforming element, which enables beamforming functionality within the transmit and/or receive antennas (e.g., by using analog or digital weights to vary the radiation pattern generated by the transmit antennas) so as to attenuate RF signals extending between the transmit antennas and the receive antennas. By attenuating signals extending between the transmit and the receive antennas, a high degree of isolation is achieved between transmission and reception paths.