Multi-band Direct Sampling Receiver Architecture
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Solution Overview
Problem
Wireless communication systems face challenges in miniaturization and cost reduction due to the need for numerous analog components in radio frequency electronics, especially at higher frequencies, and limitations in digital conversion of analog radio frequency signals.
Innovation Solution
A method and system that utilize a plurality of bandpass filters and a programmable sample clock generator to select a sample rate that places the radio signal's passband within a Nyquist zone, allowing for digital processing and conversion of radio signals across various frequency bands using a switching network and analog-to-digital conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional analog components are used for radio frequency signal processing, then signal processing capability is maintained, but device size, weight, and power consumption increase
Solution Approach 1:
The patent replaces traditional analog radio frequency components (mixers, local oscillators, filters) with a direct sampling architecture that uses an analog-to-digital converter to directly convert RF signals to digital domain. This substitution eliminates numerous analog components, reducing device size, weight, and power consumption while maintaining signal processing capability through digital signal processing techniques.
Solution Approach 2:
The patent employs a programmable sample clock generator that can dynamically adjust the sampling rate to match different radio frequency bands. By changing the sampling parameter based on the operating band, the system maintains optimal performance across multiple frequencies without requiring dedicated analog components for each band, thus reducing overall device complexity and size.
2Extent of automation
If analog to digital conversion is used for software defined radio, then digital processing capability is improved, but conversion speed limitations occur at frequencies of 2 GHz and above
Solution Approach 1:
The patent incorporates a programmable sample clock generator that pre-configures the sampling rate before analog-to-digital conversion based on the detected or selected radio frequency band. This preliminary action ensures that the ADC is optimally prepared for the incoming signal frequency, enabling accurate high-speed conversion at frequencies of 2 GHz and above by establishing the correct sampling parameters in advance.
Solution Approach 2:
The system dynamically adjusts the sampling rate of the programmable sample clock generator to match the specific requirements of different frequency bands. This dynamic adaptation allows the ADC to operate at optimal speeds for each band, overcoming the limitation of fixed-speed converters and enabling effective digital processing across a wide frequency range including frequencies above 2 GHz.
3Adaptability or versatility
If multiple frequency bands are supported, then system versatility is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal direct sampling receiver architecture that can process multiple frequency bands using a single programmable sample clock generator and analog-to-digital converter. By making these core components programmable and adaptable, the system achieves multi-band support without requiring separate dedicated circuits for each frequency band, thereby maintaining versatility while minimizing device complexity.
Solution Approach 2:
The system supports multiple frequency bands by dynamically changing the sampling rate parameter of the programmable sample clock generator. Instead of using fixed-frequency analog components for each band, the system adjusts the digital sampling parameter to match the desired operating band, enabling flexible multi-band operation with a single simplified hardware architecture.
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 enables efficient digital processing of radio signals across multiple frequency bands, reducing the need for analog components and allowing for flexible frequency band selection, thereby minimizing size, weight, and power consumption in wireless communication systems.
Implementation Method 1
passing the radio signal through a selected one of a plurality of selectable bandpass filters to form a filtered signal. The selected one of the bandpass filters can have a passband encompassing the radio signal.
Implementation Method 2
sampling the filtered signal at the sample rate to form a sampled signal. The sample rate can be selected from a plurality of predefined sample rates so that the passband is contained entirely within a Nyquist zone corresponding to the sample rate.
Implementation Method 3
digitizing the sampled signal to form a digitized signal
Implementation Method 4
A programmable sample clock generator can output a sample clock to the sample and hold. The programmable sample clock generator can generate a selected one of a plurality of different sample clock rates.
Data Source
AI summary
A radio signal reception technique includes selecting a sample rate from a plurality of predefined sample rates so that the radio signal is contained entirely within a Nyquist zone corresponding to the sample rate. The radio signal is passed through a selected one of a plurality of selectable bandpass filters to provide an analog signal. The analog signal is sampled at the sample rate and converted to a digital signal.