Precoding Matrix Amplitude Removal for MIMO Power Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multiple input multiple output (MIMO) systems, the direct use of non-constant modulus channel information matrices for precoding leads to a loss of transmit power due to unequal amplitudes among transmit antennas, preventing them from operating at maximum power concurrently.
Innovation Solution
A method and apparatus that process non-constant modulus channel information matrices to obtain constant modulus matrices by removing amplitude information and preserving phase information, allowing for the generation of precoding matrices that enable all transmit antennas to operate at maximum power by equalizing amplitudes, thereby reducing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-constant modulus channel information matrix is directly used for precoding, then channel capacity is improved, but transmit power is lost due to unequal amplitudes among transmit antennas
Solution Approach 1:
The patent extracts the amplitude information from the non-constant modulus channel information matrix, separating it from the phase information. By removing the amplitude component, the system can use only the phase information for precoding, which eliminates the power loss caused by unequal amplitudes while maintaining the channel capacity benefits
Solution Approach 2:
The patent changes the parameter of the channel information matrix from non-constant modulus to constant modulus by removing amplitude variation. This parameter change transforms the matrix into a form that can be directly used for precoding without causing power imbalance, while still providing accurate channel state information for capacity optimization
2Measurement precision
If non-constant modulus channel information matrix is used for precoding, then data transmission accuracy is improved, but power imbalance occurs among transmit antennas
Solution Approach 1:
The patent extracts and removes the amplitude information that causes power imbalance, while retaining the phase information that provides transmission accuracy. This separation allows the precoding to maintain data accuracy without suffering from power imbalance among antennas
Solution Approach 2:
The patent applies different quality requirements to different components of the channel information: the phase component is preserved with high precision for accurate data transmission, while the amplitude component is removed to eliminate power imbalance issues
Data Source
AI summary
Embodiments of the present invention disclose a precoding method and apparatus in a multiple input multiple output system, and pertain to the communication field.The method includes: receiving a non-constant modulus channel information matrix fed back by a UE; processing the non-constant modulus channel information matrix and removing amplitude information, and obtaining a precoding matrix according to a constant modulus channel information matrix; and precoding data to be sent by using the precoding matrix. The apparatus includes: a receiving module, a processing module, and a precoding module. According to the technical solutions provided in the embodiments of the present invention, the non-constant modulus channel information matrix fed back by the UE is processed and the amplitude information in the channel information matrix is removed; the precoding matrix is obtained according to the constant modulus channel information matrix; and after the data to be sent is precoded by using the precoding matrix, transmit antennas are enabled to concurrently send the data to be sent at the maximum transmit power, which reduces a power loss.