Precoder Constellation Rotation for MIMO Interference Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-user MIMO wireless communication systems, existing precoders face challenges in controlling power effectively, leading to performance degradation due to interference and noise, particularly in high-speed data communication environments with multipath fading and inter-symbol interference.
Innovation Solution
A precoder system that includes an interference signal real channel generator, a rotary angle selector, a modulo operator, and a matrix multiplier to eliminate interference signals and control transmission power by rotating the constellation of transmission signals, while also using a rotary angle estimator and modulo operator/demodulator at the receiving end to maintain signal constellations and restore data bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a precoder is used to eliminate signal interference among multiple users, then interference reduction is achieved, but the power difference between signal interference and transmission signal increases, deteriorating the signal-to-noise ratio
Solution Approach 1:
The patent applies parameter changes by modifying the transmission signal through rotation in the complex plane (changing phase and amplitude parameters) before precoding. This rotation optimizes the signal characteristics to reduce the power difference between transmission signal and interference signal, thereby improving the signal-to-noise ratio while maintaining interference elimination capability
Solution Approach 2:
The patent introduces dynamic adaptation by selecting rotation angles based on channel conditions and user requirements. The precoder dynamically adjusts the rotation parameter to optimize performance for different channel states, making the interference cancellation more effective without causing excessive power differences
2Productivity
If high data rates are transmitted in MIMO system, then data rates are improved, but inter-symbol interference and frequency selective fading increase
Solution Approach 1:
The patent applies preliminary action by performing signal rotation and precoding operations before transmission to pre-compensate for expected channel effects. This preliminary processing reduces inter-symbol interference and frequency selective fading effects before the signal enters the channel, enabling higher data rates with reduced distortion
3Use of energy by moving object
If transmission power is reduced to improve energy efficiency, then energy consumption decreases, but signal quality and system performance deteriorate
Solution Approach 1:
The patent optimizes signal parameters through rotation and precoding to maximize signal quality at the receiver for a given transmission power. By changing the phase and amplitude parameters of the transmitted signal, the system achieves better signal-to-noise ratio and reduced interference, allowing lower transmission power while maintaining signal quality
Solution Approach 2:
The patent employs feedback mechanisms where the receiver provides channel state information and signal quality metrics back to the transmitter. This feedback enables the precoder to adaptively adjust rotation angles and precoding matrices to maintain optimal signal quality at reduced power levels
Data Source
AI summary
The present invention relates to a precoder and a precoding method in a multi-user multi-antenna communication System. When a transmission part (100) having a plurality of antennas transmits a plurality of signals to a receiving part (200) having an antenna, the precoder and the precoding method using the same prevents System performance degradation caused by interference signals and efficiently reduces transmission power while changing the constellation rotary angle. When the power is controlled by using the precoder, the System performance is enhanced while not damaging the structural gain of the existing multi-user multi-antenna precoder.