Wireless Side Link Synchronization for Mobile Channel Sounding
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Solution Overview
Problem
Current MIMO channel sounding systems require pre-allocated measurement times and rely on fiber/cable links or rubidium clocks for synchronization, which are impractical for outdoor measurements and require frequent resynchronization, especially when using millimeter wave frequencies with high propagation loss.
Innovation Solution
Establishing a wireless side link between a mobile channel sounding transmitter and receiver using out-of-band or in-band communication sessions, allowing for synchronization via a synchronization signal that conveys clock timing and channel sounding waveform information, enabling synchronization without physical cables and reducing the need for frequent resynchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber/cable links or rubidium clocks are used for synchronization, then synchronization accuracy is maintained, but portability and ease of operation deteriorate due to physical cable requirements and frequent resynchronization needs
Solution Approach 1:
The patent replaces mechanical/physical synchronization systems (fiber/cable links and rubidium clocks) with a wireless electronic synchronization system. The transmitter and receiver establish synchronization through wireless communication of timing signals, eliminating the need for physical cable connections and portable clock devices, thereby improving portability while maintaining synchronization accuracy.
2Device complexity
If pre-allocated measurement times are used, then system coordination is simplified, but measurement speed and productivity deteriorate due to frequent resynchronization requirements
Solution Approach 1:
The patent implements preliminary synchronization action by establishing the wireless synchronization link before measurements begin. The transmitter sends synchronization signals containing timing information in advance, allowing the receiver to be pre-synchronized and eliminating the need for frequent resynchronization during measurements, thereby improving measurement speed while maintaining system coordination.
3Ease of operation
If wireless side link synchronization is implemented, then portability and measurement speed are improved, but system complexity increases due to additional wireless communication protocols
Solution Approach 1:
The patent applies multi-functionality by using the wireless side link for multiple purposes: synchronization signal transmission, timing information exchange, and measurement coordination. This consolidates multiple functions into a single communication channel, reducing overall system complexity despite the addition of wireless communication capabilities.
Data Source
AI summary
In one example, a processing system of a mobile channel sounding transmitter including at least one processor may establish a wireless side link between the mobile channel sounding transmitter and a channel sounding receiver, transmit, to the channel sounding receiver, a wireless synchronization signal via the wireless side link, and transmit at least one channel sounding waveform in accordance with the wireless synchronization signal. In another example, a processing system of a channel sounding receiver including at least one processor may establish a wireless side link between a mobile channel sounding transmitter and the channel sounding receiver, obtain, from the mobile channel sounding transmitter, a wireless synchronization signal via the wireless side link, and obtain, from the mobile channel sounding transmitter, at least one channel sounding waveform in accordance with the wireless synchronization signal.