RF Receiver Interface for Wireless Baseband Signal Processing
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Solution Overview
Problem
The complexity of interactions between data processing hardware and RF front-end receivers in wireless devices leads to increased costs and limited design flexibility due to the need for multiple baseband receiver interfaces, which are costly and occupy significant layout space in integrated circuits.
Innovation Solution
A method and system for an RF receiver interface that selects between analog and digital interfaces to receive I/Q data signals, decimates the signals, and uses a CORDIC algorithm-based derotator to remove VLIF frequency, enabling a cost-effective and flexible architecture by programmably converting between conventional and VLIF analog interfaces and digital formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple baseband receiver interfaces are used to support different RF front-end receivers, then compatibility and versatility are improved, but device complexity and layout space increase
Solution Approach 1:
The patent implements a universal baseband receiver interface that can handle multiple RF front-end receiver types through a single unified interface. The system uses programmable parameters including sampling rate selection (384 kHz, 768 kHz, 1.536 MHz, 3.072 MHz), frequency offset compensation, and gain adjustment to accommodate different RF vendors' receivers. This multi-functional interface eliminates the need for separate dedicated interfaces for each RF receiver type, thereby reducing device complexity while maintaining broad compatibility.
Solution Approach 2:
The interface employs dynamic parameter adjustment to adapt to different RF front-end receivers in real-time. Key dynamic parameters include programmable sampling rates, adjustable gain levels, and frequency offset compensation that can be modified based on the specific RF receiver being used. This dynamic configurability allows a single interface to serve multiple functions without requiring hardware changes, resolving the contradiction between versatility and complexity.
2Adaptability or versatility
If multiple baseband receiver interfaces are implemented, then support for various RF front-end receivers is improved, but layout space in integrated circuit increases
Solution Approach 1:
By consolidating multiple interface functions into a single universal baseband receiver interface, the patent significantly reduces the layout space required in the integrated circuit. Instead of dedicating separate physical interface circuits for each RF receiver type, the system uses one shared interface with programmable parameters that can be configured via software or control signals. This approach maintains support for various RF front-end receivers while minimizing the physical footprint on the chip.
3Adaptability or versatility
If individual baseband receiver interfaces are used for each RF front-end receiver, then interface compatibility is improved, but cost increases
Solution Approach 1:
The patent reduces manufacturing cost by implementing a single universal baseband receiver interface that can work with multiple RF front-end receivers from different vendors. This eliminates the need to manufacture and stock multiple different interface types, simplifying the supply chain and reducing per-unit costs. The interface achieves this through programmable parameters including sampling rate selection, frequency offset compensation, and gain adjustment that can be configured via software updates without requiring hardware changes.
Solution Approach 2:
The system uses parameter changes to achieve compatibility with different RF front-end receivers. Key parameters that can be modified include sampling rate (384 kHz to 3.072 MHz), frequency offset values, and gain levels. By changing these parameters through software configuration rather than hardware modification, the system maintains interface compatibility across different receiver types while keeping manufacturing costs low. This parameter-based adaptability allows a single hardware design to serve multiple purposes.
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 number of required interfaces, minimizes layout space, and enhances flexibility by allowing the RF receiver interface to efficiently process I/Q data signals, thereby addressing the cost and complexity issues of conventional systems.
Implementation Method 1
Removal of the VLIF frequency may be performed by a derotation function based on a CORDIC algorithm
Data Source
AI summary
In a wireless device, a method and system for a baseband receiver interface including analog and digital components are provided. An analog or a digital interface may be selected for a I/Q data signal received from a front-end receiver. The analog interface may be a conventional RF or a VLIF interface. The I/Q data signal may be digitized when received from the analog interface and saturation detection may be used during digitization of the I/Q data signal. When the analog interface is the VLIF interface, a derotator may be used to remove the VLIF frequency. The derotator may be based on a CORDIC algorithm. The I/Q data signal may be converted from serial to parallel format when received from the digital interface. The received I/Q data signal may be decimated before transferred to a baseband processor.