Wide Bandwidth Digital Pre-Distortion in Remote Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communications systems face challenges in achieving wide bandwidth digital predistortion due to limited processing bandwidth in remote units, leading to failure in meeting regulatory and operational requirements such as adjacent channel power ratio and third-order intermodulation distortion, especially in fifth-generation new-radio systems with wide carrier bandwidths.
Innovation Solution
Implementing multiple transceiver circuits in remote units to process and amplify downlink digital communications signals in portions of the carrier bandwidth, allowing for the combination of signals to achieve a wider bandwidth, thereby mitigating processing bandwidth limitations and enhancing linearity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transceiver circuit is used in remote units, then device complexity is reduced, but processing bandwidth is limited and cannot meet wide bandwidth communication requirements
Solution Approach 1:
The patent divides the wide carrier bandwidth into multiple smaller signal bandwidths, with each transceiver circuit processing one segment. This segmentation allows the system to achieve wide bandwidth capability through multiple circuits working in parallel, resolving the contradiction between bandwidth adaptability and device complexity by making the complexity manageable through modular division.
Solution Approach 2:
The patent combines the output signals from multiple transceiver circuits to form a composite wide bandwidth signal. By merging the processed segments from multiple circuits, the system achieves the desired wide bandwidth capability while maintaining controlled complexity through systematic combination of modular components.
2Reliability
If digital pre-distortion is applied across wide bandwidth, then linearity and distortion cancellation improve, but processing bandwidth limitations prevent effective implementation
Solution Approach 1:
The patent applies digital pre-distortion separately to each segmented signal bandwidth processed by individual transceiver circuits. This segmentation of the DPD application allows each circuit to operate within its processing bandwidth capabilities while collectively achieving wide bandwidth linearity performance through the combination of all segmented processed signals.
Solution Approach 2:
The patent optimizes the digital pre-distortion parameters and processing characteristics for each specific signal bandwidth segment according to its local requirements. This local optimization ensures that each transceiver circuit achieves best possible linearity performance for its assigned bandwidth, contributing to overall system reliability across the wide carrier bandwidth.
3Productivity
If multiple transceiver circuits are implemented to process wide bandwidth signals, then processing bandwidth limitation is mitigated, but device complexity increases
Solution Approach 1:
The patent segments the wide carrier bandwidth into multiple manageable signal bandwidths, assigning each to a separate transceiver circuit. This segmentation increases productivity by enabling parallel processing of wide bandwidth signals while controlling device complexity through modular, standardized circuit designs that can be systematically combined.
Solution Approach 2:
The patent designs the transceiver circuits with universal functionality to process different signal bandwidth segments using the same architectural framework. This multi-functionality approach increases productivity across the wide bandwidth while minimizing device complexity by reusing the same circuit design patterns rather than requiring specialized circuits for each frequency band.
Data Source
AI summary
Wide bandwidth digital pre-distortion (DPD) in a remote unit(s) for a wireless communications system (WCS) is disclosed. In embodiments disclosed herein, a remote unit(s) includes at least two transceiver circuits, each configured to process (e.g., perform DPD) a respective downlink digital communications signal corresponding to a portion of the carrier bandwidth. Each of the transceiver circuits is further configured to convert the respective downlink digital communications signal into a respective downlink RF communications signal. The respective downlink RF communications signals generated by the transceiver circuits are subsequently combined to form a downlink RF communications signal(s) associated with the carrier bandwidth. By employing multiple transceiver circuits in the remote unit(s) to each handle a portion of the carrier bandwidth, it may be possible to mitigate processing bandwidth limitations of the remote unit(s), thus making it possible to satisfy the regulatory and/or operational requirements for supporting wide bandwidth communications in the WCS.