Base Station Interference Removal for Network-Coded Messages
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Solution Overview
Problem
In wireless communications, the use of multiple-user multiple-input multiple-output (MU-MIMO) technology in relay stations leads to interference between network-coded and non-network-coded messages, causing inefficiencies in bandwidth usage and decoding issues, particularly when network-coded messages are transmitted to base stations.
Innovation Solution
A method where a base station receives signals containing network-coded and non-network-coded messages, determines interference using transmission parameters such as packet identifiers, precoding vectors, and modulation coding schemes, and removes this interference to recover the network-coded message, while a relay station transmits these messages with accompanying parameters to facilitate decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MU-MIMO technology is used at the relay station to concurrently transmit network-coded and non-network-coded messages, then bandwidth usage is reduced, but interference between messages causes decoding failures
Solution Approach 1:
The base station acts as an intermediary that receives both network-coded and non-network-coded messages from the relay station, determines the interference caused by non-network-coded messages, and removes this interference to recover the network-coded messages for further processing
Solution Approach 2:
The patent converts the harmful interference caused by concurrent MU-MIMO transmissions into a manageable problem by having the base station calculate and remove the interference, thereby enabling the system to benefit from the bandwidth efficiency of MU-MIMO while mitigating its harmful effects
2Ease of operation
If separate sub-frames are used for uplink and downlink relay transmissions, then transmission scheduling is simplified, but bandwidth efficiency deteriorates
Solution Approach 1:
The patent merges uplink and downlink relay transmissions by applying network coding at the relay station, allowing both types of transmissions to occur simultaneously in the same time slot, thereby improving bandwidth efficiency while the base station handles the complexity of interference removal
Data Source
AI summary
A method performed by a base station is provided. The method includes receiving, at the base station, a signal containing a transmitted first signal including a network coded message and a transmitted second signal including a non-network coded message, where the second signal is transmitted according to at least one transmission parameter. The method further includes receiving, at the base station, the at least one transmission parameter and determining, by the base station, an interference to the transmitted first signal caused by the transmitted second signal, where the interference is determined using the at least one transmission parameter. The method further includes removing the determined interference from the signal to recover the transmitted first signal.