D2D Signal Demodulation via Adaptive Reference Signals
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Solution Overview
Problem
In device-to-device (D2D) communication, existing methods face challenges in efficiently handling frequency offset during signal transmission and reception, which affects demodulation performance.
Innovation Solution
A method where a user equipment (UE) receives a subframe, a first reference signal, and reference signal pattern information, and performs linear interpolation for channel estimation if the pattern indicates transmission of a second reference signal, adapting to frequency offset between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linear interpolation is performed during channel estimation for D2D signal demodulation, then demodulation performance is maximized, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining reference signal patterns and preparing reference signals in advance based on frequency offset conditions. The UE receives reference signal pattern information that indicates whether a second reference signal will be transmitted, allowing the device to prepare appropriate channel estimation methods beforehand rather than computing everything in real-time, thus improving demodulation performance while managing complexity.
2Reliability
If reference signal pattern information is used to adaptively transmit second reference signal, then demodulation performance improves, but loss of information increases
Solution Approach 1:
The patent implements feedback by using reference signal pattern information that provides guidance on whether a second reference signal should be transmitted. This feedback mechanism allows the receiving UE to adapt its channel estimation process based on the transmitted pattern information, improving demodulation performance while minimizing information loss through efficient use of reference signals.
Data Source
AI summary
One embodiment of the present invention discloses a method by which a terminal receives a device-to-device (D2D) signal in a wireless communication system, the D2D signal receiving method comprising the steps of: receiving a subframe; receiving a first reference signal in a preset symbol of the subframe; and receiving reference signal pattern information in a symbol neighboring the preset symbol on the basis of the received reference signal, wherein if the reference signal pattern information indicates the transmission of a second reference signal, the terminal performs a linear interpolation during a channel estimation for a D2D signal demodulation in the subframe.