Wireless Communication Device Multi-Band Signal Synthesis
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Solution Overview
Problem
Conventional wireless communication devices face challenges in achieving a small circuit size for simultaneous reception and synthesis of signals from different frequency bands, as they require multiple oscillators and reception paths, leading to increased circuit size and power consumption.
Innovation Solution
A wireless communication device utilizing a direct conversion system with two local oscillators operating at different frequencies, where one oscillator generates a signal at an intermediate frequency and the other at a frequency difference, allowing for simultaneous reception and processing of signals from multiple frequency bands using a single reception path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple oscillators and reception paths are used to receive signals from different frequency bands, then the ability to receive and process multiple frequency bands is improved, but the circuit size increases
Solution Approach 1:
The patent combines multiple reception paths into a single path by using a frequency converter that can process multiple frequency bands simultaneously. Instead of having separate oscillators and reception paths for each frequency band, the system uses one reception path with a frequency converter that handles multiple bands, thereby reducing circuit size while maintaining the ability to receive multiple frequency bands.
Solution Approach 2:
The frequency converter is designed to perform multiple functions by processing signals from different frequency bands through a single path. This universal approach allows the same hardware components to handle multiple frequency bands, eliminating the need for dedicated separate paths for each band and thus reducing overall circuit complexity.
2Adaptability or versatility
If multiple oscillators are used for different frequency bands, then the frequency coverage is improved, but the power consumption increases
Solution Approach 1:
The patent merges multiple oscillator functions into a single oscillator that operates at a base frequency, with frequency multiplication and conversion performed by the frequency converter. This eliminates the need for multiple separate oscillators, each consuming power, while still achieving coverage across multiple frequency bands through signal processing.
Solution Approach 2:
The system changes the frequency parameter of the signal through the frequency converter rather than using multiple oscillators at different frequencies. This allows the same oscillator to serve multiple frequency bands by transforming the frequency of the received signal, thereby reducing power consumption while maintaining frequency coverage.
3Speed
If a direct conversion system is used to widen bandwidth, then the receiver bandwidth is improved, but the ability to synthesize signals from different frequency bands is lost
Solution Approach 1:
The frequency converter acts as an intermediary that bridges the direct conversion system's bandwidth advantage with the ability to handle multiple frequency bands. It converts signals from different frequency bands into a common frequency range that can be processed by the single reception path, enabling both wide bandwidth and multi-band synthesis capabilities.
Solution Approach 2:
The patent segments the frequency conversion process to handle different frequency bands separately through the frequency converter, then combines them in the single reception path. This allows the system to maintain wide bandwidth capability while also synthesizing signals from multiple frequency bands by processing them through the same segmented conversion stages.
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 reduces the circuit size and power consumption by enabling the reception and synthesis of signals from multiple frequency bands using a single signal processor, while maintaining frequency stability and allowing for efficient bandwidth utilization.
Implementation Method 1
a frequency converter that mixes the plurality of local oscillator signals at the different frequencies with the plurality of signals received by the signal receiver
Data Source
AI summary
An antenna receives an RF signal and an RF signal at different frequency bands. An oscillator outputs a local oscillator signal at a frequency f1. An oscillator outputs a local oscillator signal at a frequency f2. A modulator modulates the frequency based on the local oscillator signal at the frequency f1 and the local oscillator signal at the frequency f2, and generates a plurality of local oscillator signals at different frequencies. A frequency converter mixes the plurality of local oscillator signals, at different frequencies, generated by the modulator, with the RF signal and the RF signal, and generates baseband signals of the RF signal and the RF signal. A signal processor performs a predetermined process for the baseband signals generated by the frequency converter.