SDR Radio Receiver Decimation for Low-Power Sampling
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Solution Overview
Problem
Conventional radio receivers in battery-operated sensor arrays face challenges in precisely matching sampling rates, leading to high energy consumption and reduced data transmission quality, especially in narrowband transmissions, due to the limitations of existing radio chips and A/D converters.
Innovation Solution
A radio receiver design that includes a receiving device feeding data to a microcontroller for decimation and temporary storage, using a clock generator to set precise sampling rates, and employing filtering and decimation to reduce computing power and energy consumption, while maintaining data transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling rate is precisely matched on conventional radio chips, then data transmission quality is improved, but the device complexity and manufacturing precision requirements increase significantly
Solution Approach 1:
The patent introduces a decimation filter as an intermediary component between the A/D converter and the signal processing unit. This decimation filter performs resampling and filtering operations that compensate for imprecise sampling rates, thereby achieving accurate sampling rate matching without requiring the radio chip itself to be highly complex or precisely manufactured
Solution Approach 2:
The patent replaces the need for precise mechanical/electrical sampling rate matching in the radio chip with a software-based decimation filter that performs digital resampling. This substitution allows for flexible sampling rate adjustment through software rather than requiring precise hardware configuration
2Measurement precision
If complex computing power is used for resampling, then sampling rate precision is improved, but energy consumption increases significantly
Solution Approach 1:
The patent performs resampling and filtering operations in advance during the decimation process, rather than performing complex real-time computations during signal processing. This preliminary action reduces the computational burden during critical signal processing operations, thereby reducing energy consumption
Solution Approach 2:
The patent changes the sampling rate parameter through decimation by a factor M, transforming a high sampling rate into a lower sampling rate that is more energy-efficient to process. This parameter change reduces the computational workload and associated energy consumption while maintaining signal integrity
3Adaptability or versatility
If the A/D converter is clocked by a clock generator, then the sampling rate can be adjusted, but the adjustment precision remains very limited
Solution Approach 1:
The patent implements dynamic sampling rate adjustment through the decimation filter, which can adaptively change the decimation factor M based on signal conditions. This dynamic approach allows for precise sampling rate adjustment that is not limited by the fixed clock generator settings, enabling flexible adaptation to different transmission conditions
4Use of energy by moving object
If data is transmitted in fragmented form, then energy consumption at the radio front end is minimized, but data transmission quality and reliability decrease
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device determines whether a received data packet is complete or partial, and requests retransmission of missing packets. This feedback ensures data integrity and transmission reliability while maintaining the energy efficiency benefits of fragmented transmission
Data Source
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AI summary
The invention relates to a radio receiver (10) of the SDR type for use in an environment which is self-sufficient in power, preferably self-sufficient in power in the long term, the radio receiver (10) comprising a receiver (1) by which data (2) in the form of at least one data packet or a part thereof or of a data stream having a specific data rate are received and provided for further data processing. In an operating mode A the data (2) are diverted at the receiver (1) and delivered to a microcontroller (3) at a preferably definable sampling rate, the microcontroller (3) decimates the data by selecting some data from the sampled amount, and the microcontroller (3) buffers the decimated data in a memory (4, 18) and provides them for further processing.