Distributed Antenna Signal Synchronization for 5G Spectrum Efficiency
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Solution Overview
Problem
Distributed antenna systems in 5G communication face challenges in maintaining time-frequency synchronization due to cell densification and short sub-frame structures, leading to increased deployment costs and reduced spectrum efficiency, especially in high-frequency communications where Doppler shift and multi-path effects cause inter-carrier and inter-symbol interference.
Innovation Solution
A cooperative transmission method that adjusts signal transmission modes based on channel conditions between antennas and terminals, using modulation technologies like FBMC to synchronize signal arrival times and minimize time delays, ensuring reliable reception and increased spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed antenna system is deployed to increase spectrum efficiency, then peak transmission rate and interference management are improved, but time-frequency synchronization is degraded due to cell densification and short sub-frame structures
Solution Approach 1:
The patent applies preliminary action by performing time delay compensation and synchronization adjustment before signal transmission. The base station calculates time delay information based on reference signals received from multiple distributed antennas and adjusts transmission timing accordingly, ensuring that signals arrive at the terminal synchronized despite the distributed spatial arrangement and cell densification.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal reports channel conditions and time delay information back to the base station. The base station uses this feedback to dynamically adjust transmission parameters, select optimal antennas, and modify timing advance values, thereby maintaining time-frequency synchronization while utilizing distributed antennas for improved spectrum efficiency.
2Speed
If high-frequency communication is used to achieve higher data rates, then transmission distance is reduced due to Doppler shift and multi-path effects, but beam forming and massive MIMO techniques can compensate
Solution Approach 1:
The patent merges multiple antenna elements into a virtual array by combining signals from multiple distributed antennas through coherent beam forming. This merging process leverages the spatial diversity provided by distributed antennas to compensate for high-frequency propagation effects, achieving both high data rates and reliable transmission over long distances through constructive signal combination.
Solution Approach 2:
The patent dynamically changes transmission parameters including modulation schemes, coding rates, and beam forming weights based on real-time channel conditions. The system adapts these parameters to optimize the trade-off between data rate and transmission reliability, utilizing massive MIMO capabilities to maintain performance across varying propagation conditions.
3Object-generated harmful factors
If cooperative transmission between multiple antennas is implemented, then interference management is improved, but deployment complexity increases due to synchronization requirements
Solution Approach 1:
The patent implements self-service by enabling the system to automatically measure and compensate for time delays without manual configuration. The base station autonomously calculates time delay information by measuring reference signals from multiple antennas and automatically adjusts transmission timing, reducing deployment complexity while maintaining effective interference management through cooperative transmission.
Data Source
AI summary
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-generation (4G) communication system such as a long term evolution (LTE). Embodiments of the present disclosure provide a method of a base station in a wireless communication system, including: determining a signal transmission mode to be used by each of antennas based on a channel condition between each of the antennas and a terminal; and transmitting signals to one or more terminals from each of the antennas based on the signal transmission mode.