Predistorted Signal Compression for Lower PA-DPD Bandwidth
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Solution Overview
Problem
The existing PA-DPD systems require a large bandwidth for transmitting predistorted signals from a centralized processing node to a remote transmitting node, which is inefficient and not optimized for reduced bandwidth usage.
Innovation Solution
The method involves decomposing predistorted signals into high-dynamic range and low-dynamic range components, generating signals with different sample rates, and combining them to produce a compressed signal for transmission, which is then decompressed at the receiving end using a de-multiplexer, rate matching circuit, and combining circuit to restore the original signal without significant information loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If predistorted signals are transmitted from a centralized processing node to a remote transmitting node, then the system achieves centralized predistortion functionality with reduced power consumption and improved deployment flexibility, but the bandwidth required for signal transmission increases significantly
Solution Approach 1:
The predistorted signal is segmented into multiple components based on dynamic range: high-dynamic range components and low-dynamic range components. This segmentation allows each component to be processed and transmitted with optimized sampling rates, reducing the overall bandwidth requirement while maintaining signal integrity.
Solution Approach 2:
The patent applies parameter changes by using different sample rates for different signal components. High-dynamic range components are transmitted at a lower sample rate (first sample rate) while low-dynamic range components are transmitted at a higher sample rate (second sample rate), optimizing the bandwidth utilization according to the specific requirements of each signal component.
2Quantity of substance
If the sample rate is reduced to decrease bandwidth requirements, then bandwidth usage is optimized, but signal information loss increases
Solution Approach 1:
Different parts of the signal are treated with different quality requirements. High-dynamic range components, which contain the most critical signal information, are transmitted at a lower sample rate with sufficient quality. Low-dynamic range components are transmitted at a higher sample rate to preserve their specific characteristics, ensuring that each signal component receives the appropriate level of processing quality.
Solution Approach 2:
The patent applies partial action by selectively applying different sample rates to different signal components rather than uniformly reducing the sample rate across the entire signal. This approach maintains sufficient information for reconstruction by preserving the essential characteristics of each component with appropriate sampling density.
3Use of energy by stationary object
If the predistorter is located remotely from the power amplifier, then power consumption at remote locations is reduced and space is saved, but the complexity of the transmission system increases
Solution Approach 1:
The transmission system complexity is managed through segmentation of the signal processing functions. The centralized processing node performs signal decomposition into high-dynamic range and low-dynamic range components, while the remote transmitting node performs reconstruction by combining these components. This segmentation distributes computational complexity across different locations, making the overall system more manageable despite the distributed architecture.
Data Source
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AI summary
Methods and apparatus are disclosed for compressing and decompressing data to reduce bandwidth requirements in transmissions of predistorted signals between a processing node and a remote transmitting node of a power amplifier with digital predistortion (PA-DPD) system. In the processing node, predistorted signals are decomposed into a high-dynamic range signal of a first sample rate and a low-dynamic range signal of a second sample rate greater than the first sample rate. Samples of both signals are combined to generate a compressed signal for transmission to the remote transmitting node, which decompresses the compressed signal to restore the predistorted signal.