RF Receiver Filter Reconfiguration Compensation
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Solution Overview
Problem
RF receivers with direct RF digitization face performance limitations due to dynamic behavior in communication channels, particularly with high-order modulations, as reconfiguration of the RF signal processing unit's filter causes transient amplitude steps leading to uncorrectable errors.
Innovation Solution
A dynamically reconfigurable RF filter in conjunction with a digital signal processing unit that adjusts the transfer function of channels to compensate for changes in the RF filter's transfer function, ensuring minimal signal amplitude changes and maintaining optimal performance across varying input spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RF filter is dynamically reconfigured to adapt to changing communication channels, then the receiver's adaptability improves, but transient amplitude steps occur causing uncorrectable errors in high-order modulations
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values for all possible RF filter configurations in lookup tables. When the RF filter is reconfigured, the corresponding compensation values are already available, allowing immediate application without causing transient amplitude steps. This resolves the contradiction by enabling rapid adaptation while maintaining transmission reliability through pre-prepared compensation data.
Solution Approach 2:
The patent implements feedback by continuously monitoring the received signal quality and automatically adjusting the RF filter configuration and corresponding digital compensation parameters. The system measures actual signal characteristics and feeds this information back to optimize the filter settings and compensation values, ensuring adaptability to changing channels while maintaining reliable transmission through closed-loop control.
2Device complexity
If a programmable RF filter is used to compensate for uneven amplitude distribution, then the ADC dynamic range requirements are relaxed, but reconfiguration causes transient amplitude steps that hamper the baseband demodulator
Solution Approach 1:
The patent merges the RF filter compensation function with digital signal processing compensation. Instead of relying solely on the RF filter to correct amplitude distribution, the system combines RF filter settings with corresponding digital compensation parameters that are applied in the baseband. This merged approach allows the RF filter to be reconfigured for optimal ADC dynamic range while the digital compensation counteracts any transient amplitude steps, maintaining ease of baseband demodulation.
Solution Approach 2:
The patent introduces digital compensation parameters as an intermediary between the RF filter and the baseband demodulator. When the RF filter is reconfigured, these intermediary compensation parameters are adjusted to offset the transient amplitude steps, allowing the RF filter to operate optimally for ADC dynamic range while protecting the baseband demodulator from harmful transients.
3Productivity
If multiple single-channel receivers are used to handle high data rates, then the receiver capacity increases, but the cost and power consumption increase significantly
Solution Approach 1:
The patent applies universality by designing a single RF receiver front-end that can handle multiple channels through dynamic reconfiguration of the RF filter. Instead of requiring separate dedicated receivers for each channel, the system uses one universal receiver that can be dynamically adapted to receive different channels by reconfiguring the filter parameters, thereby reducing power consumption and cost while maintaining high receiver capacity.
Solution Approach 2:
The patent implements dynamics by making the RF filter parameters dynamically adjustable during operation. The receiver can switch between different channel configurations by dynamically reconfiguring the filter, allowing a single receiver to perform the work of multiple static receivers. This dynamic approach reduces the total number of receivers needed, lowering power consumption and cost while maintaining the ability to handle high data rates across multiple channels.
Data Source
AI summary
An RF receiver comprising: an RF signal processing unit for receiving an RF signal, wherein the RF signal processing unit comprises a dynamically reconfigurable RF filter for filtering the RF signal; an analog-to-digital converter for converting the filtered RF signal to a digital signal; and a digital signal processing unit for processing the digital signal to provide at least one channel; wherein the digital signal processing unit is adapted to adjust a respective transfer function of at least one said channel when the RF filter is reconfigured, to at least partially compensate a change in the transfer function of the RF filter.