Channel Information Acquisition in Massive Antenna Arrays
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Solution Overview
Problem
The existing methods for acquiring channel information in massive antenna arrays result in a sharp increase in overhead for reference signals, limiting the spectral efficiency of the system and hindering further improvements in transmission performance.
Innovation Solution
A method and device that acquire channel information by determining an estimate S' between N antennae and a receiving antenna using channel information Y from M antennae that send reference signals, reducing the overhead of reference signals through the use of a unitary matrix W and a random matrix, thereby improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennae on the sending side is increased to improve system capacity and coverage, then spectral efficiency and power efficiency are improved, but the overhead of reference signals for channel information acquisition increases sharply
Solution Approach 1:
The patent segments the channel information acquisition process into two stages: first acquiring channel information from a subset of M antennae, then using matrix operations to estimate channel information for all N antennae. This segmentation reduces reference signal overhead by not requiring separate reference signals for each of the N antennae, thus resolving the contradiction between system capacity and reference signal overhead.
Solution Approach 2:
The patent uses channel information from M antennae as a 'copy' or sample to estimate the channel information for all N antennae through matrix operations. Instead of directly measuring all N channels, the system creates an estimated copy of the full channel state from a smaller subset, reducing the reference signal overhead while maintaining acceptable channel information quality.
2Productivity
If the number of antennae on the sending side is increased to improve spectral efficiency, then spatial radio resources are better utilized, but the complexity of channel information acquisition increases
Solution Approach 1:
The patent uses channel information from a subset of M antennae as a sample to create an estimated representation of the full N-antenna channel state through matrix operations. This copying approach reduces the complexity of directly acquiring and processing channel information from all N antennae, while still enabling effective massive MIMO transmission with improved spectral efficiency.
3Measurement precision
If existing channel information acquisition methods are used in massive antenna arrays, then channel information can be obtained, but the overhead of reference signals limits further improvement in spectral efficiency
Solution Approach 1:
The patent segments the channel information acquisition into two phases: acquiring actual channel information from M antennae using reference signals, and then estimating the remaining N-M antenna channels through matrix operations. This segmentation reduces reference signal overhead compared to acquiring all N channels directly, thereby improving spectral efficiency while maintaining adequate channel information quality for massive MIMO transmission.
Data Source
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AI summary
The present disclosure discloses a method and device for acquiring channel information, and relates to a massive antenna array transmission technology. The method includes that: a receiving side acquires indexes L of M antennae which send reference signals in N antennae of a sending side; channel information Y between the M antennae and a receiving antenna of the receiving side is acquired; a unitary matrix W with a dimension of N×N is acquired; and an estimate S' of channel information S between the N antennae of the sending side and the receiving antenna of the receiving side is determined by virtue of the indexes L, the unitary matrix W and the channel information Y