Interference Removal Precoding Matrix in Multi-Hop Relay Systems
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Solution Overview
Problem
In multi-hop relay communication systems, interference between signals transmitted by a base station and relay stations limits data transmission efficiency, requiring twice the time for downlink data transmission and wasting resources.
Innovation Solution
A method using multi-input/multi-output (MIMO) technology, where a base station generates an interference removal precoding matrix based on channel information to transmit data to a relay station in the first time slot and to mobile stations in the second time slot, while simultaneously transmitting data to another mobile station using the same resource, employing techniques like nulling and prewhitening to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station transmits data to mobile stations while the relay station transmits data to mobile stations simultaneously, then the resource utilization is improved, but the signal interference increases
Solution Approach 1:
The patent converts the harmful interference between base station and relay station signals into a beneficial mechanism by using the interference channel information to generate precoding matrices. The base station intentionally designs its transmission to exploit the interference, transforming it from a harmful factor into a controlled component that enables simultaneous transmission without degrading performance.
Solution Approach 2:
The patent changes the transmission parameters by introducing precoding matrices that are specifically designed based on channel state information. These precoding matrices modify the signal parameters (amplitude, phase, spatial distribution) to enable the base station and relay station to transmit simultaneously while managing interference through parameter optimization.
2Object-affected harmful factors
If the base station waits for the relay station to finish transmitting before transmitting new data, then the signal interference is minimized, but the data transmission time is doubled
Solution Approach 1:
The patent enables continuous useful action by allowing the base station to transmit data continuously without waiting for the relay station to finish its transmission. The precoding mechanism ensures that both transmissions can occur simultaneously and continuously, eliminating the idle waiting period and maintaining continuous productive transmission across the network.
Solution Approach 2:
The base station performs preliminary actions by obtaining channel state information and calculating precoding matrices in advance, before the actual simultaneous transmission begins. This preliminary preparation enables the base station to configure its transmission parameters optimally, allowing it to transmit data concurrently with the relay station without causing harmful interference.
3Productivity
If the base station transmits data to multiple mobile stations simultaneously using MIMO technology, then the transmission rate is improved, but the interference management complexity increases
Solution Approach 1:
The patent introduces precoding matrices as an intermediary mechanism that mediates between the base station's multi-user transmission and the relay station's transmission. These precoding matrices act as a control layer that manages interference automatically, reducing the complexity of direct interference management while enabling simultaneous transmissions to multiple mobile stations.
Solution Approach 2:
The system uses channel state information feedback from mobile stations to the base station to dynamically adjust precoding matrices. This feedback mechanism enables the base station to adapt its transmission parameters based on current channel conditions, managing interference complexity through information-driven adaptation rather than complex real-time coordination.
Data Source
AI summary
The invention relates to a data transfer method in a multi-hop relay system. The data transfer method comprises: a step for allowing a base station to receive from a first terminal the channel information (Hd,1) between the base station and the first mobile station, a step for making the base station generate an interference cancellation precoding matrix using Hd,1, a step for forcing the base station to transfer first data to a relay station, and a step for making the relay station transfer the first data to the first mobile station and forcing the base station to transfer second data to a second mobile station, wherein the second data is converted using the interference cancellation precoding matrix. According to the disclosed data transfer method in the multi-hope relay system, the base station transfers data to another mobile station efficiently when the relay station transfers data to a mobile station. Therefore, the data transfer method is able to efficiently use the resources wasted in an existing data transfer method and improve the total data transmission rate of the base station.