EPDCCH Channel Estimation Using Virtual Antenna Ports
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Solution Overview
Problem
Wireless communication systems face challenges in performing channel estimation and receiving control information on an Enhanced Physical Downlink Control Channel (EPDCCH), particularly when a transmitter has a single physical antenna, as existing methods struggle to maintain channel estimation performance in such scenarios.
Innovation Solution
The solution involves ensuring predetermined channel estimation performance by employing a method that allows channel estimation using multiple DMRS ports, even when a transmitter has a single physical antenna, by assuming the same precoding is applied to all allocated DMRS ports, and using this information for improved channel estimation and control information reception on the EPDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a transmitter has a single physical antenna, then device complexity is reduced, but channel estimation performance deteriorates
Solution Approach 1:
The patent creates virtual antenna ports (DMRS ports) that copy the functionality of multiple physical antennas. By assuming the same precoding is applied to all allocated DMRS ports, the system generates multiple reference signal ports from a single physical antenna, enabling channel estimation as if multiple antennas were present. This copying approach maintains channel estimation performance while using only one physical antenna.
Solution Approach 2:
The patent changes the parameter of antenna port configuration by allocating multiple DMRS ports (e.g., ports 7, 8, 9, 10) to a single physical antenna. This parameter change allows the receiver to perform channel estimation using multiple ports while the transmitter uses only one physical antenna, thus resolving the contradiction between device complexity and measurement precision.
2Measurement precision
If multiple DMRS ports are allocated for channel estimation, then channel estimation performance is improved, but device complexity increases
Solution Approach 1:
The patent makes the single physical antenna universal by applying the same precoding to all allocated DMRS ports. This multi-functionality approach allows one physical antenna to serve multiple virtual ports (7, 8, 9, 10), enabling the system to achieve channel estimation performance comparable to multiple physical antennas while maintaining simple hardware architecture.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
One embodiment of the present invention relates to a method for receiving control information through an enhanced physical downlink control channel (EPDCCH) in a wireless communication system, including the steps of: channel estimation in an EPDCCH related physical resource block (PRB) pair set; and, on the basis of the channel estimation, monitoring the EPDCCH in the PRB pair set, wherein, when the number of physical antennas of a transmission point transmitting the EPDCCH is 1, the terminal is assumed to identically precode allocated ports for the EPDCCH.