Base Station MIMO Antenna Configuration via Pilot Signal Analysis
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Solution Overview
Problem
Massive MIMO systems face challenges in configuring antenna arrays due to poor pilot signal transmission conditions, where pilot signals are often indistinguishable from noise, especially in environments with large distances or low power devices.
Innovation Solution
A method where a base station analyzes a predefined number of last recently transmitted pilot signals to determine wireless channel properties, averaging noise and improving reliability by considering multiple pilot signals within a coherence time and coherence bandwidth, and configuring antenna parameters based on these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilot signals are transmitted from terminal devices to base station antennas, then channel information can be obtained for antenna configuration, but the pilot signals become indistinguishable from noise in poor transmission conditions
Solution Approach 1:
The patent combines multiple pilot signals transmitted at different times into a single composite signal for channel estimation. The base station receives and processes a plurality of pilot signals from terminal devices across multiple time instances, merging them to form a more reliable channel estimate that overcomes individual signal degradation and noise interference.
Solution Approach 2:
The patent performs preliminary channel estimation by analyzing multiple pilot signals before final antenna configuration decisions are made. The base station processes the plurality of pilot signals in advance to obtain channel information, which then guides the subsequent antenna parameter configuration for actual data transmission.
2Reliability
If multiple pilot signals are transmitted to improve channel estimation accuracy, then noise averaging improves reliability, but transmission time and resource consumption increase
Solution Approach 1:
The patent uses a predefined number of pilot signals that is sufficient to achieve the desired reliability threshold for antenna configuration but not excessively large. This partial action approach balances the need for reliable channel estimation with the constraint of limited transmission time and processing resources, avoiding unnecessary delays while ensuring adequate noise averaging.
3Productivity
If antenna parameters are configured based on single pilot signal analysis, then configuration speed is maintained, but accuracy deteriorates in noisy conditions
Solution Approach 1:
The patent merges information from multiple pilot signals to determine channel properties before configuring antenna parameters. The base station processes a plurality of pilot signals simultaneously or sequentially, combining their information to achieve accurate channel estimation that maintains both precision and reasonable configuration speed through efficient signal processing.
Data Source
AI summary
A system is disclosed that includes a base station having a plurality of antennas a control unit which analyses pilot signals received from the terminal device at the plurality of antennas to obtain information about a wireless channel property of the wireless channel between the terminal device and the plurality of antennas. According to a method, a plurality of pilot signals is transmitted from the terminal device to the base station, and information about the wireless channel property of the wireless channel between the terminal device and the plurality of antennas of the base station is determined based on a predefined number of last recently transmitted pilot signals of the plurality of pilot signals from the terminal device. Based on the information about the wireless channel property, at least one parameter of the plurality of antennas is configured by the base station.