MIMO Microwave Carrier Frequency Synchronization via IDU Reference
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Solution Overview
Problem
Multiple-input multiple-output (MIMO) microwave devices face challenges in correcting carrier frequency offsets between channels, leading to increased complexity and potential correction failures or degraded system performance.
Innovation Solution
A method and device that adjust the carrier frequency of MIMO microwave devices by obtaining the frequency of radio frequency-reference crystal oscillators and their corresponding frequency multiplication factors, selecting a reference frequency, and adjusting the carrier frequency based on radio frequency offsets between ODUs, allowing the IDU to synchronize and correct carrier frequencies across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each ODU has an independent radio frequency-reference crystal oscillator, then each ODU can operate independently, but carrier frequency offsets between different channels occur and increase system complexity
Solution Approach 1:
The patent merges the frequency reference functions by having all ODUs synchronize to a common reference frequency broadcast by the IDU, rather than each ODU operating with completely independent oscillators. This reduces frequency deviation between channels while maintaining independent operation capability.
Solution Approach 2:
The patent implements feedback mechanisms where the IDU broadcasts reference frequency information to all ODUs, and ODUs adjust their local oscillators based on this feedback. This closed-loop approach minimizes carrier frequency offsets between channels.
2Adaptability or versatility
If each ODU has an independent radio frequency-reference crystal oscillator, then each ODU can operate independently, but carrier frequency offset correction may fail or system performance degrades
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing all ODUs to the same reference frequency before actual data transmission begins. The IDU broadcasts the reference frequency in advance, allowing ODUs to adjust their local oscillators proactively, thereby preventing large frequency offsets that would cause correction failure.
3Productivity
If a plurality of ODUs are used to support MIMO technology, then system capacity and reliability are improved, but carrier frequency offsets between different channels superpose and increase correction complexity
Solution Approach 1:
The patent applies universality by using a single reference frequency that serves all ODUs simultaneously. This common reference acts as a universal synchronization standard across all MIMO channels, reducing the complexity of managing frequency offsets in multi-channel systems while maintaining high system capacity.
Data Source
AI summary
The present invention provides a method and a device for adjusting a carrier frequency of a multiple-input multiple-output microwave device. The method includes: obtaining, by an indoor unit IDU, a frequency of a radio frequency-reference crystal oscillator and a first frequency multiplication factor of each outdoor unit ODU; selecting, by the indoor unit IDU, one of the frequencies of the radio frequency-reference crystal oscillator as a reference frequency; adjusting, by the indoor unit IDU, a carrier frequency of the multiple-input multiple-output microwave device according to the first frequency multiplication factor and a radio frequency offset between the reference frequency and the frequency of the radio frequency-reference crystal oscillator of each ODU.