Interference Cancelling Block Modulation Precoder Matrix
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Solution Overview
Problem
Co-channel interference limits the performance of wireless communication systems employing spectral reuse, as existing techniques optimized for single-cell scenarios fail to mitigate interference effectively, particularly affecting users in cell-edge regions.
Innovation Solution
The implementation of Interference Cancelling Block Modulation (ICBM) using a unique precoder matrix assigned to each transmitter, which expands symbols and provides low cross-correlation properties, allowing for interference cancellation through a predetermined set of matrices that can be static or dynamic, and is used by both transmitters and receivers to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectral reuse is employed to increase system capacity, then network productivity improves, but co-channel interference increases and degrades communication quality
Solution Approach 1:
The precoder matrix is applied in advance at the transmitter before signal transmission to pre-cancel interference. By encoding the input stream with the precoder matrix Q, the transmitter prepares the signal such that when combined with signals from other transmitters using orthogonal matrices, the interference is minimized at the receiver, enabling effective spectral reuse.
Solution Approach 2:
The invention changes the parameter of signal encoding by introducing a precoder matrix Q with specific orthogonal properties. This matrix transformation modifies the signal parameters in the time domain, creating a coded input stream that, when combined with interference signals, results in reduced correlation and improved signal quality at the receiver.
2Reliability
If precoder matrix encoding is applied to mitigate interference, then communication quality improves, but device complexity increases due to matrix operations
Solution Approach 1:
The precoder matrix Q is designed with specific local properties where different rows have orthogonal relationships. This local orthogonality structure allows the system to achieve interference cancellation without requiring full-system coordination, as each transmitter independently applies its assigned matrix with specific local quality characteristics that ensure compatibility with the overall system.
3Productivity
If multiple transmitters use the same time-frequency resources, then spectral efficiency improves, but interference cancellation becomes more difficult when interferers exceed receiver antennas
Solution Approach 1:
The invention moves the interference cancellation problem from the spatial dimension (receiver antennas) to the coding dimension (precoder matrix space). By embedding orthogonal structures in the precoder matrices, the system creates separability in a different dimension, allowing interference cancellation to work effectively even when the number of interferers exceeds the number of receiver antennas.
Data Source
AI summary
Embodiments herein disclose a method of enabling non-ICBM transmissions in the communication network. The method includes transmitting information of the number of receiver antennas at user equipments (UEs) intended to be scheduled by a transmitter in common resource elements, to a controller in the communication network. Further, the method includes receiving a number of non-Interference Cancelling Block Modulation (ICBM) transmissions from the controller. Furthermore, the method includes transmitting information indicating cell-identification numbers of participating transmitters, and corresponding index of ICBM precoder matrix of the participating transmitters to the UEs.