Base Station Radiating Means Time Shift Signal Diversity
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Solution Overview
Problem
Smart antennas reduce angular diversity and multiple paths for mobile terminals, limiting their ability to receive signals effectively, while also reducing interference.
Innovation Solution
Implementing a method where two sets of radiating means at a base station transmit the same signal with a predetermined time shift, creating time diversity to alleviate fading and maintain interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If smart antennas are used to focus the radio beam for a particular terminal, then interference level is reduced, but angular diversity and multiple paths are reduced
Solution Approach 1:
The antenna system is divided into multiple independent radiating means (first radiating means and second radiating means), each capable of transmitting the same signal independently. This segmentation allows the system to provide multiple copies of the signal through different paths while maintaining beam focusing capability, thereby resolving the contradiction between interference reduction and angular diversity.
Solution Approach 2:
The patent introduces a time dimension to the transmission system by applying a predetermined time shift between the first and second radiating means. This temporal separation creates time diversity, allowing the receiver to distinguish between the two signal copies and combine them constructively, thus maintaining angular diversity while preserving the interference reduction benefits of beam focusing.
2Reliability
If the same signal is transmitted by multiple radiating means with time shift, then time diversity is created to alleviate fading, but transmission time is increased
Solution Approach 1:
The patent applies partial action by using only two radiating means with a predetermined time shift, rather than requiring multiple independently varying transmissions. This partial approach provides sufficient time diversity to alleviate fading while minimizing the additional transmission time overhead, achieving a balance between reliability improvement and time cost.
Data Source
AI summary
The invention relates to transmission from a base station to a receiver, the base station comprising first radiating means arranged for transmitting according to an antenna pattern with respect to the receiver and further comprising second radiating means arranged for transmitting according to the same antenna pattern as the first radiating means with respect to the receiver, the transmissions of the first and second radiating means being time shifted by a determined duration.