Antenna Multiplexing for TD-SCDMA Coverage and Throughput
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Solution Overview
Problem
The current multiple antenna systems, specifically in TD-SCDMA systems, face an imbalance in coverage capability between common and service channels, limiting the effectiveness of smart antenna systems and MIMO antenna systems, which affects network coverage and throughput.
Innovation Solution
An antenna multiplexing system combining smart antenna and MIMO antenna technologies, where the smart antenna array with antenna elements spaced less than or equal to half a wavelength and the MIMO antenna array with dependent antenna elements work together to transmit data, allowing adaptive switching between modes to balance coverage and enhance throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smart antenna system with small antenna element spacing (≤1/2 wavelength) is used, then beam forming capability and anti-interference capability are improved, but coverage capability of common channel and broadcast channel deteriorates
Solution Approach 1:
The antenna array is segmented into multiple independent antenna elements that can be selectively activated. The system divides the antenna resources into different groups, where some elements are used for beam forming on service channels while others support common channels through spatial diversity, allowing simultaneous optimization of both coverage and anti-interference performance
Solution Approach 2:
The system dynamically switches between smart antenna mode and MIMO mode based on channel conditions and service requirements. For service channels requiring anti-interference, the system activates beam forming with selected antenna elements, while for common channels, it switches to MIMO mode with all elements to maximize coverage capability
2Productivity
If MIMO antenna system with large antenna element spacing is used, then spatial multiplexing gain and channel capacity are improved, but beam forming capability deteriorates
Solution Approach 1:
The system dynamically switches between smart antenna mode and MIMO mode based on channel conditions and service requirements. When high data rate is needed and channel conditions permit, the system activates MIMO mode with all antenna elements to maximize spatial multiplexing gain and channel capacity. When beam forming is required for service channels, it switches to smart antenna mode with selectively activated elements
3Adaptability or versatility
If adaptive switching between MIMO antenna and smart antenna is implemented, then system versatility and throughput are improved, but device complexity increases
Solution Approach 1:
The same physical antenna array structure serves multiple functions by dynamically reconfiguring its operation mode. The antenna elements can be selectively activated and deactivated based on service type, allowing the system to function as either a smart antenna system for beam forming or a MIMO system for spatial multiplexing, eliminating the need for separate hardware systems
Solution Approach 2:
The system implements dynamic mode switching between smart antenna and MIMO operations based on real-time channel conditions and service requirements. The base station controller adaptively determines the optimal operating mode and activates相应的 antenna elements, enabling the system to optimize performance for different services without requiring complex separate hardware configurations
Data Source
AI summary
An antenna multiplexing system and a method of a smart antenna and a Multiple-Input Multiple-Output antenna are provided, wherein the system includes a MIMO antenna array and a smart antenna array, the smart antenna array includes several groups of antenna array elements in which the distance between neighbor antenna array elements is less than or equal to one half of wavelength, and the smart antenna array comprises at least two groups of antenna array elements with the coherence sufficient for the requirement of the MIMO applications. The method includes: in accordance with the type of the data to be transmitted, determining a transmitting mode and processing the data to be transmitted accordingly, and in accordance with the transmitting mode, controlling the MIMO antenna array or smart antenna array, so as to transmitting the data to the mobile terminal. With the premise that the actual coverage of TD-SCDMA system should be further improved, the requirement of higher user throughout could be met, and the MIMO antenna system could satisfy the requirement of the future system evolution. Both of the applications of the MIMO and the smart antenna could be met with the use of the same antenna feeding system, and the adaptive switching of the MIMO and the smart antenna with respect to the user could be achieved.