Cooperative Base-Station Channel Estimation for Interference Suppression
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Solution Overview
Problem
Existing systems face difficulties in obtaining accurate information of propagation channels between base stations and terminals, which is crucial for effective interference suppression in mobile communication systems.
Innovation Solution
A system comprising multiple base stations with signal transportation means and a base-station cooperative network that includes transmitters, receivers, and an estimation section to estimate propagation channels using pilot signals, allowing for interference suppression through centralized or distributed control apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations cooperate to suppress interference, then communication quality is improved, but obtaining propagation channel information becomes difficult
Solution Approach 1:
The patent applies preliminary action by having terminals transmit pilot signals before actual communication occurs. These pilot signals enable base stations to pre-obtain propagation channel information, which is then used for interference suppression during subsequent data transmission. This resolves the contradiction by preparing channel information in advance, making it easily obtainable without affecting communication quality.
Solution Approach 2:
The patent uses pilot signals as an intermediary element between terminals and base stations. These dedicated pilot signals serve as a medium through which propagation channel information is transmitted and measured, facilitating the cooperative interference suppression function without requiring direct measurement during actual communication, thus resolving the information acquisition difficulty.
2Ease of manufacture
If pilot signals are used for channel estimation, then propagation channel information is obtained easily, but signal resources are consumed
Solution Approach 1:
The patent makes pilot signals multi-functional by designing them to serve both as channel estimation references and as resources that can be reused across multiple base stations through cooperation. The same pilot signal structure is utilized by multiple base stations to obtain channel information, reducing the need for additional dedicated signals and thereby conserving overall signal resources while maintaining ease of channel information acquisition.
Data Source
AI summary
A system for suppressing an interference occurring between a plurality of base stations in a mobile communication system is provided. In the present system, each of the plurality of the base stations comprises an antenna section, a transmitter, a first receiver that processes a reception signal received by the antenna section, one or two or more second receivers that process reception signals received by the antenna sections of one or two or more surrounding base stations and transferred via a signal transportation means, and an estimation section that estimates information of propagation channels h between an own cell terminal and the plurality of the base stations, based on a reception result of a base-station specific signal (for example, a pilot signal) received by the first receiver from an own cell terminal and a reception result of the base-station specific signal received by the second receiver from the own cell terminal.