Channel Estimation Reference Signals for UE Pre-Equalization
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing receiver complexity and power consumption, particularly in scenarios without channel reciprocity, due to the need for channel estimation processes that are typically performed at the receiving device, leading to increased processing demands.
Innovation Solution
Implementing a transmit pre-equalization scheme where channel state information is acquired by a user equipment (UE) based on samples of a downlink reference signal transmitted from a wireless device, allowing the UE to perform channel estimation and offload processing from the wireless device, using modified or extended channel estimation reference signals like DMRS or CSI-RS with a dense frequency domain pattern and low-complexity sample compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state information is computed and reported by the wireless device, then channel estimation accuracy is improved, but receiver complexity and power consumption increase
Solution Approach 1:
The patent introduces an intermediary approach where the UE performs channel estimation using reference signals and provides pre-equalization to the wireless device. This shifts the computational burden from the wireless device to the UE, maintaining channel estimation accuracy while reducing receiver complexity and power consumption at the wireless device side.
2Measurement precision
If channel state information is computed and reported by the wireless device, then channel estimation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent introduces an intermediary approach where the UE performs channel estimation using reference signals and provides pre-equalization to the wireless device. This shifts the computational burden from the wireless device to the UE, maintaining channel estimation accuracy while reducing receiver complexity and power consumption at the wireless device side.
3Measurement precision
If a dense frequency domain pattern is used for channel estimation reference signals, then channel estimation quality is improved, but uplink signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary reference signal samples from the downlink reference signals and sends them to the UE. By selecting specific samples rather than transmitting all reference signal data, the system maintains channel estimation quality while reducing uplink signaling overhead.
Solution Approach 2:
The patent uses partial action by transmitting a subset of reference signal samples rather than the complete set. This partial transmission is sufficient for the UE to perform accurate channel estimation and pre-equalization, avoiding the need to transmit all reference signal data and thereby reducing uplink overhead.
Data Source
AI summary
Methods, systems, and devices that support channel estimation reference signals for pre-equalization are described. In some examples, channel state information (CSI) for a link between a user equipment (UE) and another wireless device may be acquired by the UE based on samples of a downlink reference signal transmitted from the UE to the wireless device. Specifically, the wireless device (e.g., an extended reality (XR) device) may obtain samples of the downlink reference signal (e.g., a channel estimation reference signal) and report or indicate (e.g., transmit) the samples to the UE via an uplink transmission. For example, the reference signals may be sampled at the wireless device side, and CSI may be obtained using the samples signaled back to the UE by the wireless device. The UE may perform channel estimation based on the received samples, which may enable transmit pre-equalization of signals sent to the wireless device.