Serial Link Multiplexing for RF Data and Control Synchronization
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Solution Overview
Problem
In wireless communication systems, synchronizing analog signals converted from digital samples and control information at downstream components is challenging due to increasing wireless communication frequencies, especially when using serial communication links.
Innovation Solution
The integration of a method to multiplex control information with digital samples over a serialized interface, using serialized transmit and receive interfaces, and a power amplifier with externally controllable sub-circuits, ensures time-alignment of control signals with the converted analog signals, employing protocols like JESD204 for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is sent over a separate communication link from digital samples, then control information can be transmitted independently, but synchronization between control information and analog signals becomes difficult at downstream components
Solution Approach 1:
The patent combines control information and digital sample data into a single serialized communication link. The control bits are multiplexed with the digital sample streams, allowing both data types to be transmitted together over the same interface (e.g., JESD204B serial link), thereby eliminating synchronization issues between separate links while reducing system complexity.
Solution Approach 2:
The serialized communication interface is designed to handle multiple functions simultaneously: it transmits both digital sample data and control information through the same physical medium and protocol framework. This multi-functional approach allows a single communication infrastructure to serve dual purposes, improving reliability without requiring additional dedicated links for control signals.
2Speed
If wireless communication frequencies are increased, then communication performance is improved, but synchronization of analog signals and control information becomes increasingly challenging
Solution Approach 1:
The patent applies preliminary timing alignment by inserting control bits at specific positions within the serialized data stream before transmission. The control bits are positioned relative to known sample boundaries and frame structures, allowing the receiving end to predict and pre-align control signal timing with the corresponding analog signal conversion, thereby compensating for frequency-induced timing drift.
Solution Approach 2:
The system employs feedback mechanisms where the receiving end monitors the arrival timing of control bits relative to the reconstructed analog signal and adjusts synchronization parameters accordingly. This closed-loop approach allows dynamic compensation for timing variations caused by high-frequency operations, maintaining precise alignment between control information and analog signals.
Data Source
AI summary
A communication system includes a digital data processor that produces a digital data sample and one or more control bits. A serialized transmit interface assembles the digital data sample and the control bit(s) into first and second data packets of a data frame, and sends the data frame over a signal line. A serialized receive interface receives the data frame and produces a reconstructed digital data sample and the control bit(s) from the first and second data packets. A control circuit coupled to the serialized receive interface produces a control signal from the control bit(s). The communication system may include a converter circuit, which produces an RF input signal by performing a digital-to-analog conversion of the reconstructed digital data sample, and by upconverting the resulting analog data sample signal to RF. A power amplifier amplifies the RF input signal and modifies operation of a sub-circuit based on the control signal.