Frequency-Selective Digital Pre-Distortion for Component Carriers
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Solution Overview
Problem
Conventional digital pre-distortion (DPD) techniques fail to consider frequency selectivity in wireless communication networks with multiple component carriers (CCs), leading to performance degradation in CCs with lower propagation loss.
Innovation Solution
Applying digital pre-distortion with frequency selectivity to transmission signals, where target parameters such as transmission power, modulation and coding scheme, and error vector magnitude are based on the frequency of each component carrier, allowing for tailored distortion correction across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional digital pre-distortion is applied uniformly across all component carriers, then distortion correction is provided, but performance degrades in frequency bands with lower propagation loss
Solution Approach 1:
The patent applies different pre-distortion target parameters to different frequency bands based on their propagation loss characteristics. Frequency bands with higher propagation loss use one set of target parameters, while bands with lower propagation loss use different target parameters, ensuring each band receives optimized distortion correction tailored to its specific conditions.
Solution Approach 2:
The patent changes the pre-distortion target parameters according to frequency band characteristics. By determining target parameters based on propagation loss measurements for each frequency band and applying corresponding pre-distortion settings, the system adapts the distortion correction to match the specific requirements of each band, preventing performance degradation in bands with lower propagation loss.
2Use of energy by moving object
If amplifiers are operated near the non-linear region to increase efficiency, then device efficiency improves, but additional distortion is introduced to transmit signals
Solution Approach 1:
The patent applies digital pre-distortion to the transmit signals before they reach the amplifier. By pre-compensating for the expected non-linear distortion based on the amplifier's operating characteristics and frequency band-specific propagation loss, the system enables the amplifier to operate efficiently near its non-linear region while maintaining signal integrity through advance correction.
Solution Approach 2:
The patent determines target parameters based on measured propagation loss for each frequency band and uses this feedback to adjust the pre-distortion settings. This closed-loop approach allows the system to optimize amplifier operation by adapting pre-distortion parameters to actual channel conditions, balancing efficiency and distortion correction dynamically.
3Object-generated harmful factors
If pre-distortion is applied to counteract amplifier distortion, then spectral re-growth is reduced, but complexity of the transmission system increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple bands and applies pre-distortion with frequency selectivity to each band separately. By dividing the broad frequency range into smaller segments with similar propagation characteristics, the system reduces spectral re-growth more effectively than uniform pre-distortion while managing complexity through structured frequency band processing.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for applying digital pre-distortion with frequency selectivity to a transmission signal. An example technique includes determining one or more target parameters of an input signal, the one or more target parameters being based on frequency of the input signal. The technique also includes applying digital pre-distortion with frequency selectivity to the input signal according to the one or more target parameters of the input signal to generate a resulting signal. The technique further includes processing the resulting signal to generate an analog signal for transmission and transmitting the analog signal.