Wireless Receiver High-Linearity Mode for Jammer Desense
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Solution Overview
Problem
Wireless transceivers face challenges in maintaining high linearity and sensitivity when operating in carrier aggregation (CA) and dual connectivity (DC) modes due to jamming signals, which can lead to desensing and failure to meet sensitivity specifications.
Innovation Solution
Implementing a high linearity mode by using a front-end attenuator to attenuate received signals, including jammer signals, before they enter the receive chain, thereby reducing the impact of jammers and maintaining high sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmit signals are transmitted concurrently in carrier aggregation or dual connectivity modes, then communication capacity and data rate are improved, but jammer signals are generated that cause desensing and degrade receiver sensitivity
Solution Approach 1:
The patent applies preliminary action by attenuating the received signal before it enters the receive chain processing. The attenuator is positioned at the front end of the receiver, before the LNA and other processing stages, to pre-reduce the impact of jammer signals before they can cause desensing effects in subsequent circuitry.
Solution Approach 2:
The patent introduces an attenuator as an intermediary component between the antenna/receive chain input and the LNA processing stage. This intermediary element selectively reduces the amplitude of received signals including jammer signals, allowing the system to maintain high linearity operation while protecting downstream components from overwhelming interference.
2Reliability
If a front-end attenuator is used to attenuate received signals to reduce jammer impact, then receiver sensitivity specification is met, but signal loss occurs before amplification
Solution Approach 1:
The patent applies dynamics by making the attenuator controllable and adjustable rather than fixed. The attenuator can dynamically adjust its attenuation level based on operating conditions, allowing the system to optimize between reducing jammer impact and preserving weak signal strength. This is particularly important when transitioning between different transmission modes or when jammer conditions vary.
Solution Approach 2:
The patent changes the operational parameters of the receive chain by introducing variable attenuation control. The attenuation parameter can be adjusted based on the detected jammer signal strength and operating mode, allowing the system to adaptively optimize performance across different conditions rather than using a fixed attenuation value.
Data Source
AI summary
Certain aspects of the present disclosure generally relate to techniques and apparatus for operating a wireless receiver of the apparatus in a high linearity mode. An example method includes operating the apparatus in a first mode with transmission of a plurality of transmit signals. The method also includes attenuating a received signal via an attenuator while operating the apparatus in the first mode. The method further includes amplifying the attenuated signal with an amplifier while operating the apparatus in the first mode. For certain aspects, the method further involves operating the apparatus in a second mode, bypassing the attenuator while operating the apparatus in the second mode, and amplifying the received signal with the amplifier while operating the apparatus in the second mode.