Wireless Equalization Domain Switching for Channel-Dependent Power Use
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Solution Overview
Problem
Wireless devices face challenges in managing power consumption due to increased bandwidth requirements, particularly in high frequency ranges, where existing equalization techniques for DFT-s-OFDM and SC waveforms either consume high power or have high complexity, especially for dispersive and flat channel conditions.
Innovation Solution
A wireless device selects between time domain and frequency domain equalization based on detected channel conditions, using techniques like Fourier transforms for dispersive channels and resampling for flat channels to optimize power consumption and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If time domain equalization is used for dispersive channels, then complexity is reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamic equalization scheme selection based on detected channel conditions. The wireless device switches between time domain equalization (for dispersive channels with delay spread below threshold) and frequency domain equalization (for flat channels), optimizing the balance between complexity and power consumption according to real-time channel characteristics
Solution Approach 2:
The patent changes the equalization domain parameter (time vs. frequency) based on channel condition parameters. By monitoring delay spread and adjusting the equalization approach accordingly, the system adapts to different channel scenarios to minimize power consumption while maintaining acceptable complexity levels
2Use of energy by moving object
If frequency domain equalization is used for flat channels, then power consumption is reduced, but complexity increases
Solution Approach 1:
The system dynamically selects frequency domain equalization when channel conditions indicate flat fading (delay spread above threshold). This dynamic adaptation allows the device to reduce power consumption in suitable conditions while managing complexity through conditional application of FFT-based methods
Solution Approach 2:
The patent changes the equalization domain parameter from time to frequency based on channel condition parameters. By switching to frequency domain processing (using FFT) when delay spread exceeds the threshold, the system optimizes power consumption while accepting increased complexity only when channel conditions warrant it
3Productivity
If equalization is performed for DFT-s-OFDM waveforms, then signaling efficiency is improved, but power consumption and complexity increase compared to conventional OFDM
Solution Approach 1:
The patent segments the equalization process into two distinct paths: time domain equalization for dispersive channels and frequency domain equalization for flat channels. This segmentation allows DFT-s-OFDM to achieve signaling efficiency improvements while managing power consumption by applying different processing strategies to different channel conditions
Solution Approach 2:
The patent changes the processing domain parameter (time vs. frequency) based on channel delay spread characteristics. This parameter change enables the system to maintain signaling efficiency benefits of DFT-s-OFDM while reducing power consumption by selecting the appropriate equalization domain for each channel scenario
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows wireless devices to select an equalization technique that balances power consumption and performance, reducing power usage while maintaining signaling efficiency for both dispersive and flat channels, particularly for DFT-s-OFDM waveforms.
Implementation Method 1
performing a Fourier transform on the set of time domain data samples to obtain a set of frequency domain data samples in response to selecting the frequency domain equalization scheme
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for equalization domain selection at a wireless device. A wireless device may be configured to support a selection between time domain equalization and frequency domain equalization for receiving RF signals, which may be performed in accordance with detected channel conditions. For example, if a wireless device detects conditions associated with a relatively dispersive channel, the wireless device may select a frequency domain equalization and, if the wireless device detects conditions associated with a relatively flat channel, the wireless device may select a time domain equalization. In some implementations, performing a time domain equalization may include changing a sampling rate into a symbol rate, such as performing a resampling using a Farrow resampler. Such techniques may include a wireless device selecting an equalization scheme associated with a relatively lowest power consumption for detected channel conditions.