Signal Processing Device for Aggregated Spectrum Sub-band Segmentation
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Solution Overview
Problem
Mobile radio terminals face challenges in reducing power consumption due to the need for wide bandwidth and dynamic range in radio-receiver circuitry to handle aggregated-spectrum radio-frequency signals, which are often fragmented and vary by location, leading to high power consumption and interference issues.
Innovation Solution
A processing device with multiple processing paths, each equipped with a complex mixer and analog channel-selection filters, uses local oscillator signals and control units to frequency translate and filter sub-bands within the aggregated spectrum, allowing for efficient processing and reducing the overall bandwidth and dynamic range requirements, thereby lowering power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio-receiver circuitry is designed to handle the entire aggregated spectrum with wide bandwidth and dynamic range, then the signal quality and coverage are improved, but the power consumption increases significantly
Solution Approach 1:
The aggregated spectrum is divided into multiple sub-bands, with each processing path dedicated to a specific sub-band. This segmentation allows the receiver to process only the necessary frequency ranges rather than the entire aggregated spectrum, reducing the bandwidth and dynamic range requirements of each processing path while maintaining overall signal quality across all sub-bands
Solution Approach 2:
The system dynamically configures the processing paths based on the actual sub-band locations and requirements. The control unit adjusts the local oscillator signals and filter parameters according to the specific sub-band assignments, enabling the receiver to adapt its processing capabilities to match the actual signal requirements rather than maintaining fixed high-performance settings for the entire spectrum
2Adaptability or versatility
If the radio-receiver circuitry is designed to handle fragmented frequency bands scattered across a wide spectrum, then the adaptability to different location and time conditions is improved, but the device complexity increases
Solution Approach 1:
Multiple processing paths are designed with identical functional structures, each capable of processing a sub-band independently. This universal design allows the same circuit architecture to be reused across different frequency bands and locations, achieving high adaptability without proportionally increasing device complexity, as the complexity is distributed and standardized across identical modular units
3Duration of action of moving object
If the bandwidth and dynamic range requirements are reduced to lower power consumption, then the battery life is extended, but the ability to handle the entire aggregated spectrum is compromised
Solution Approach 1:
The aggregated spectrum is segmented into multiple sub-bands that are processed in parallel by separate processing paths. Each processing path operates with reduced bandwidth and dynamic range requirements appropriate for its specific sub-band, thereby extending battery life, while the collective capability of all processing paths maintains comprehensive spectrum coverage and adaptability
Solution Approach 2:
The outputs from multiple processing paths are combined to form the complete received signal across the aggregated spectrum. This merging of individually processed sub-bands restores the full spectrum coverage capability while each individual path operates efficiently with lower power consumption, achieving both extended battery life and maintained spectrum coverage
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
The solution effectively reduces power consumption in radio-receiver circuitry while maintaining signal quality by focusing on specific sub-bands rather than the entire aggregated spectrum, minimizing interference and extending battery life in mobile devices.
Implementation Method 1
a complex mixer adapted to frequency translate the complex input signal, and thereby the associated sub band, based on a local oscillator signal associated with the complex mixer
Implementation Method 2
an analog channel-selection filter, operatively connected to an output port of the complex mixer, arranged to filter an output signal of the complex mixer and pass the frequency translated associated sub band
Data Source
AI summary
A processing device (40) for processing an analog complex input signal generated by downconversion of an aggregated-spectrum radio-frequency signal in a radio-receiver (10), wherein the complex input signal comprises a plurality of sub bands (S1-S4) scattered across a total frequency band (4) of the complex input signal. The processing device (40) comprises a plurality of processing paths (P1-PN). wherein each processing path (P1-PN) is adapted to process an associated sub band (S1-S4). Each processing path comprises a complex mixer (CM1-CMN) adapted to frequency translate the complex input signal, and an analog channel-selection filter (CSF1-CSFN) arranged to filter an output signal of the complex mixer (CM1-CMN) and pass the frequency translated associated sub band (S1-S4). A control unit (60) is adapted to receive control data indicating frequency locations of the sub bands (S1-S4) and, for each processing path (P1-PN). control the local oscillator signal of the complex mixer (CM1-CMN) of the processing path (P1-PN) based on the frequency location of the associated sub band (S1-S4) and the passband of the channel-selection filter (CSF1-CSFN) of the processing path (P1-PN), such that the frequency-translated associated sub band (S1-S4) appears within a passband of the channel-selection filter (CSF1-CSFN) of the processing path (P1-PN). The distortion monitored in the unused paths may be used to improve the performance of the used paths.