Local Oscillator Synchronization for Millimeter-Wave Phased Arrays
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving high data rates and low latency at millimeter wave frequencies due to high power consumption and inefficiencies in phased array systems, particularly in massive MIMO deployments, where traditional high-resolution designs lead to impractical power requirements and inefficiencies.
Innovation Solution
The implementation of a low-resolution, nonlinear MIMO radio system with single-bit or few-bit transmitters and receivers, utilizing low-power, low-complexity radio cells that operate in the digital domain for beamforming, and employing adjustable local oscillators synchronized through a master oscillator and digital pulse generator to reduce power consumption and increase efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional high-resolution phased array systems are used at millimeter wave frequencies, then high data rates can be achieved, but power consumption becomes impractically high
Solution Approach 1:
The patent changes the resolution parameter from traditional high-resolution (many bits) to low-resolution (single-bit or few-bit) quantization. This parameter change fundamentally alters the power consumption characteristics while maintaining achievable data rates through efficient digital beamforming algorithms that exploit the statistical properties of wireless channels.
Solution Approach 2:
The patent replaces traditional analog beamforming mechanisms with digital beamforming processing. By moving the beamforming operation to the digital domain after low-resolution quantization, the system eliminates the need for high-precision analog components and associated high power consumption, while achieving comparable or superior performance through computational methods.
2Reliability
If traditional high-resolution MIMO radio cells are deployed, then communication performance is improved, but device complexity increases to impractical levels
Solution Approach 1:
The patent reduces the quantization resolution parameter from traditional high-bit representations to single-bit or few-bit representations. This dramatic parameter reduction simplifies the radio cell architecture, reduces component precision requirements, and lowers overall system complexity while maintaining communication performance through intelligent digital signal processing.
Solution Approach 2:
The patent employs simple, low-complexity radio cell designs that can be easily manufactured and deployed. The single-bit or few-bit quantization architecture uses simpler components with fewer precision requirements, making the system more manufacturable and easier to deploy at scale, even if individual components have limited operational lifetimes.
3Speed
If high-gain directive antennas are used to maintain constant-power links at higher frequencies, then data rates increase, but the system requires phased arrays that consume excessive power
Solution Approach 1:
The patent substitutes traditional analog phased array beamforming with digital beamforming operations performed after low-resolution quantization. This substitution eliminates the need for high-power analog RF components and complex impedance matching networks, achieving the required beamforming gain through digital signal processing with much lower power consumption.
Solution Approach 2:
The patent employs periodic synchronization of local oscillators across the phased array elements using a master oscillator and digital pulse generator. This periodic synchronization approach maintains phase coherence necessary for beamforming while using low-power digital control signals instead of continuous high-power analog synchronization signals.
4Measurement precision
If local oscillators are synchronized across multiple radio modules, then coherent detection is achieved, but power consumption and system complexity increase
Solution Approach 1:
The patent implements periodic synchronization of local oscillators using a master oscillator that generates reference signals at a lower frequency than the carrier. Digital pulse generators provide periodic timing signals to synchronize multiple radio modules, achieving phase coherence through periodic rather than continuous synchronization, thereby reducing power consumption.
Solution Approach 2:
The patent introduces a master oscillator as an intermediary device that provides a common reference signal to multiple radio modules. This intermediary synchronization approach enables coherent detection across distributed modules without requiring direct high-power coupling between individual oscillators, reducing overall system power consumption while maintaining phase coherence.
Data Source
AI summary
Aspects of the subject disclosure may include, for example, generating multiple digital reference pulses synchronously to a master oscillator, selectively switching the multiple digital reference pulses, and providing the switched pulses to multiple radio modules operating within a millimeter wave spectrum. For each radio module, counting cycles of an adjustable LO output signal occurring between consecutive pulses of the switched digital reference pulses, determining a difference between the count value and a reference value, and adjusting the adjustable LO according to the difference. A resulting corrected LO signal is synchronized to the master oscillator. Other embodiments are disclosed.