Multi-Carrier Interference Reduction via Dynamic Delay Adjustment
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Solution Overview
Problem
Current wireless communication systems, particularly in multi-carrier EV-DO mode, face significant challenges in reducing mutual interference between adjacent carriers, which affects signal quality and demodulation accuracy.
Innovation Solution
A method and apparatus that adjust the delay of modulation signals for each carrier, comparing performance indices with set standards, and dynamically adjusting the delay based on priority levels and step sizes to ensure the indices meet the required specifications, thereby reducing inter-carrier interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are arranged adjacent to each other to increase frequency spectrum utilization, then frequency spectrum utilization is improved, but mutual interference between carriers increases
Solution Approach 1:
The patent changes the delay parameter of modulation signals for each carrier. By adjusting the delay time of modulation signals before modulation, the patent reduces the mutual interference between adjacent carriers while maintaining frequency spectrum utilization. This is achieved by dynamically adjusting the delay parameter based on the specific carrier frequency and position.
2Object-affected harmful factors
If delay adjustment is performed on modulation signals with dynamic step sizes and priority levels, then mutual interference is reduced, but device complexity increases
Solution Approach 1:
The patent applies different delay adjustments to different carriers based on their specific characteristics. Each carrier receives a customized delay adjustment according to its frequency and position, rather than a uniform adjustment. This local optimization reduces mutual interference effectively while keeping the adjustment mechanism manageable.
Solution Approach 2:
The patent uses dynamic step sizes for delay adjustment, where the adjustment step size changes based on the current interference level and convergence status. This dynamic adjustment allows the system to quickly reduce interference initially and then fine-tune the parameters, reducing the overall complexity compared to exhaustive search methods.
Data Source
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AI summary
The disclosure discloses a method for reducing mutual interference of multi-carrier, comprising: adjusting the delay of at least one modulation signal; respectively modulating each adjusted modulation signal onto each modulated signal; and comparing the performance indices of modulated signals with set performance indices, wherein the delay of at least one modulation signal is adjusted when the set performance indices are not reached, until the performance indices of modulated signals reach the set performance indices, and each current modulated signal is set as an output signal, or each current modulation signal is set as an input signal when the set performance indices are reached. The disclosure further discloses an apparatus for reducing mutual interface of multi-carrier. The disclosure can improve the performance obviously under the circumstance of arranging the multi-carrier adjacent to each other, and enable the multiple carriers to operate simultaneously in the coverage area of one radio signal, thereby greatly improving the frequency spectrum utilization ratio.