Adaptive DPoD Kernel Selection for UE MCS and EVM Limits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the non-linear power amplifiers used by network entities introduce distortion, leading to limited signal-to-noise ratio and data rate, and compensating for this distortion with digital pre-distortion at the network entity is complex and power-intensive, while digital post-distortion at the user equipment increases latency and power consumption.
Innovation Solution
The system improves digital post-distortion (DPoD) procedures by allowing user equipment (UE) to select from multiple kernels provided by the network entity, based on a target error vector magnitude (EVM), and adjusts modulation and coding scheme (MCS) indices to reduce latency and power consumption, with the network entity transmitting multiple kernels and associated EVMs to the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion is applied at the network entity to compensate for power amplifier distortion, then signal quality is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent inverts the traditional approach by moving the distortion compensation function from the network entity (pre-distortion) to the user equipment (post-distortion). The network entity transmits multiple kernels to the UE, and the UE applies these kernels to compensate for power amplifier distortion in the received signal, thereby reducing complexity at the network entity while maintaining signal quality.
Solution Approach 2:
The patent extracts the distortion compensation function from the network entity and relocates it to the user equipment. By separating the compensation function from the transmission side and placing it at the reception side, the system reduces the complexity burden on the network entity while achieving the same signal quality improvement.
2Reliability
If digital post-distortion is performed at the user equipment to compensate for distortion, then signal quality is improved, but latency and power consumption increase
Solution Approach 1:
The patent applies preliminary action by having the network entity pre-calculate and transmit multiple distortion compensation kernels to the UE before actual communication occurs. The UE receives these kernels in advance and can quickly select and apply the appropriate kernel without performing complex real-time calculations, thereby reducing latency while maintaining signal quality.
Solution Approach 2:
The patent introduces dynamics by enabling the UE to adaptively select from multiple pre-provided kernels based on current channel conditions and signal quality requirements. This dynamic selection allows the system to optimize between latency and signal quality by choosing simpler kernels when conditions permit and more complex kernels when needed.
3Use of energy by moving object
If multiple kernels are provided and UE selects based on target EVM, then power consumption is reduced, but device complexity increases due to kernel selection management
Solution Approach 1:
The patent applies parameter changes by introducing a target Error Vector Magnitude (EVM) parameter that the UE uses to select from multiple pre-provided kernels. Instead of managing complex real-time calculations, the UE selects kernels based on comparing their associated EVM parameters against the target EVM, thereby reducing power consumption while managing complexity through parameter-based selection.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques may provide for an adaptive digital post-distortion (DPoD) procedure and reporting of modulation and coding scheme (MCS) indices for communications between a user equipment (UE) and a network entity. The UE may select a kernel from a set of kernels indicated by the network entity for a DPoD procedure based on a target error vector magnitude (EVM). Additionally, or alternatively, the UE may determine a limitation for an MCS index for the network entity to use in communications with the UE based on a power limitation of the UE and an EVM associated with the MCS. The network entity and the UE may accordingly communicate using the MCS limitation requested by the UE and the determined DPoD kernel.