RF Transmitter Adaptive Predistortion Dynamic Range
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Solution Overview
Problem
Existing receiver architectures for microwave and millimeter wave systems face challenges in reducing cost, size, and power consumption while maintaining performance, and they introduce DC offset and 1/f noise, limiting dynamic range. Additionally, there is a need for improved antenna diversity to mitigate signal degradation due to echo effects.
Innovation Solution
A radio frequency transmitter system with a modem that provides baseband I and Q signals, a power amplifier module, and a predistortion module that downconverts RF signals to intermediate frequency and baseband feedback signals, along with a dynamic range power control module and temperature compensation, supports adaptive predistortion and agile frequency settings, and incorporates a dual loop synthesizer for improved phase noise resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If direct conversion receiver architecture is used to reduce cost, size, and power consumption, then these parameters are improved, but DC offset and 1/f noise increase, limiting dynamic range
Solution Approach 1:
The receiver is divided into two separate functional blocks: a direct conversion receiver for baseband signal extraction and a heterodyne receiver for intermediate frequency processing. This segmentation allows each block to operate optimally within its designated function, combining the power efficiency of direct conversion with the dynamic range benefits of heterodyne architecture.
Solution Approach 2:
The patent merges two different receiver architectures (direct conversion and heterodyne) into a single unified system. The direct conversion path handles low-frequency signals while the heterodyne path processes higher frequency signals, creating a hybrid receiver that achieves both low power consumption and high dynamic range performance.
2Area of stationary object
If signal is transmitted over long distances, then coverage area is improved, but signal decay increases and irreversible data loss becomes more likely
Solution Approach 1:
Adaptive predistortion is applied to the transmitted signal before it is sent over the channel. The system pre-compensates for expected signal degradation and distortion by applying inverse characteristics, ensuring that the signal arrives at the receiver with minimal distortion even after long-distance transmission.
Solution Approach 2:
The system employs feedback mechanisms where the receiver measures the actual signal quality and channel conditions, then feeds this information back to the transmitter. The transmitter uses this feedback to adjust modulation schemes, coding rates, and predistortion parameters dynamically, optimizing performance for current channel conditions.
Data Source
AI summary
A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.