Massive MIMO Pilot Allocation Using Joint Channel Statistics
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Solution Overview
Problem
Massive-MIMO systems face significant challenges with pilot overheads and interference due to a large number of terminals using pilots, which affect channel state information (CSI) estimation precision.
Innovation Solution
A method and apparatus that utilize a joint matrix of multi-terminal channel statistical information to determine pilots, improving CSI estimation precision by better matching channel characteristics and reducing the number of pilots required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each terminal transmits an orthogonal pilot, then pilot interference between terminals is eliminated, but pilot overheads become large
Solution Approach 1:
The patent combines channel statistical information from multiple terminals into a joint matrix, enabling the network device to determine pilots for multiple terminals simultaneously. This merging approach allows non-orthogonal pilots to be allocated while maintaining estimation precision, thereby reducing pilot overheads compared to traditional orthogonal pilot allocation.
Solution Approach 2:
The patent changes the parameter of pilot allocation from orthogonal to non-orthogonal by utilizing channel statistical information. By transforming the pilot allocation strategy and using channel statistics to guide pilot design, the system achieves precise CSI estimation without requiring orthogonal pilots, thus reducing pilot overheads.
2Quantity of substance
If each terminal transmits a non-orthogonal pilot, then pilot overheads are reduced, but pilot interference between terminals affects CSI estimation precision
Solution Approach 1:
The patent introduces channel statistical information as feedback to guide pilot allocation. The network device uses channel statistics to determine optimal non-orthogonal pilots for multiple terminals, and this statistical feedback enables the system to compensate for pilot interference, maintaining CSI estimation precision while using non-orthogonal pilots.
Solution Approach 2:
The patent uses channel statistical information as an intermediary between terminal pilots and CSI estimation. The joint matrix containing channel statistics acts as a mediator that enables the network device to process non-orthogonal pilots from multiple terminals and accurately estimate CSI despite the presence of pilot interference.
3Measurement precision
If conventional pilot allocation methods are used without multi-terminal channel statistics, then system complexity is low, but CSI estimation precision is insufficient
Solution Approach 1:
The patent performs preliminary calculation of channel statistical information and constructs a joint matrix in advance. By pre-processing channel statistics and determining optimal pilots before actual data transmission, the system achieves high CSI estimation precision. This preliminary action allows the complexity to be managed in a controlled manner while achieving superior performance.
Data Source
AI summary
A first terminal receives first information from a network device, and determines, based on the first information, a pilot used by the first terminal. The first terminal is a terminal in NU terminals, the first information is determined based on a joint matrix, the joint matrix includes transmit/receive full-dimensional statistical information of channels between the NU terminals and the network device, and the joint matrix is for determining pilots of the NU terminals.