Multi-Band IMD Correction for Targeted RF Distortion Cancellation
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Solution Overview
Problem
Conventional Digital Predistortion (DPD) systems in concurrent multi-band transmitters face challenges in efficiently correcting Intermodulation Distortion (IMD) products, particularly due to high computational complexity and inability to focus on specific IMD products, leading to increased resource utilization and bandwidth requirements.
Innovation Solution
The system generates an IMD correction signal as a function of multiple frequency band input signals, frequency translates it to the desired Radio Frequency (RF) location, and utilizes it to compensate for specific IMD products, allowing for targeted cancellation of even or odd-order IMD products of arbitrary order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DPD systems correct all distortion products in concurrent multi-band transmitters, then distortion correction coverage is comprehensive, but computational complexity increases significantly
Solution Approach 1:
The patent extracts and addresses only the specific intermodulation distortion products that fall within the signal bands of interest, rather than attempting to correct all possible distortion products. This selective approach removes the unnecessary computational burden of calculating and correcting distortion products that would not affect the actual signal quality, thereby reducing computational complexity while maintaining effective distortion correction coverage.
Solution Approach 2:
The patent segments the distortion correction task by identifying and treating specific intermodulation products (such as third-order products at 2f1-f2 and 2f2-f1) separately from other distortion components. This segmentation allows the system to focus computational resources only on the most critical distortion products that impact signal quality, rather than processing all distortion products uniformly.
2Reliability
If conventional DPD systems model all intermodulation products, then distortion correction is thorough, but resource utilization increases
Solution Approach 1:
The patent extracts only the essential intermodulation distortion products that fall within the operational signal bands for correction, eliminating the need to model and correct all possible distortion products. This extraction approach maintains thorough correction of relevant distortions while significantly reducing the computational resources, memory, and processing power required to implement the DPD system.
3Reliability
If conventional DPD systems use high sampling rates to cover all IMD products, then bandwidth coverage is sufficient, but computational complexity and resource requirements increase
Solution Approach 1:
The patent applies local quality by concentrating computational effort and bandwidth resources only on the specific frequency regions where intermodulation distortion products actually fall within the signal bands. Rather than uniformly high sampling rates across the entire spectrum, the system adapts its processing resolution and resource allocation to match the local distortion characteristics at relevant frequencies, thereby maintaining sufficient bandwidth coverage with reduced overall computational complexity.
Data Source
AI summary
Systems and methods are disclosed herein for selectively compensating for a specific Intermodulation Distortion (IMO) product(s) of an arbitrary order in a transmitter system. In some embodiments, a method of compensating for one or more specific IMO products in a concurrent multi-band transmitter system comprises generating an IMO correction signal for a specific IMO product as a function of two or more frequency band input signals for two or more frequency bands of a concurrent multi-band signal, the IMO product being an arbitrary order IMD product. The method further comprises frequency translating the IMD correction signal to a desired frequency that corresponds to a Radio Frequency (RF) location of the specific IMO product and, after frequency translating the IMO correction signal to the desired frequency, utilizing the IMO correction signal to compensate for the specific IMO product.