Antenna Port EVM Requirement Segmentation
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Solution Overview
Problem
In wireless communication networks, the calculation of error vector magnitude (EVM) is not accurately determined for certain conditions, particularly when multiple transmit antennas are used, leading to challenges in setting and meeting EVM requirements for antenna ports.
Innovation Solution
The method involves setting an error vector magnitude requirement for a transmit antenna within a set of antennas based on the number of antennas in the antenna port and performing transmissions accordingly, including power reduction techniques to meet these requirements, using a processor to manage these settings and transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EVM calculation is performed for multiple transmit antennas, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the EVM measurement process by defining separate EVM requirements for each transmit antenna (EVMreq(m) for antenna port, and EVMreq(m)/√a for individual transmit antennas). This segmentation allows independent calculation and control of EVM for each antenna, improving measurement precision while managing system complexity through modular approach.
2Reliability
If power reduction is applied to meet EVM requirements, then EVM compliance is improved, but power efficiency deteriorates
Solution Approach 1:
The patent applies partial power reduction only when necessary to meet EVM requirements. By setting EVM requirements that account for the number of transmit antennas (dividing by √a), the system avoids excessive power reduction while ensuring compliance, thus balancing reliability and power efficiency.
3Manufacturing precision
If EVM requirements are set for each transmit antenna, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the EVM requirement parameter based on the number of transmit antennas (a). By defining EVMreq(m) for the antenna port and deriving individual antenna requirements as EVMreq(m)/√a, the system achieves precise manufacturing settings that adapt to different antenna configurations without requiring completely separate configuration systems.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for meeting an error vector magnitude (EVM) requirement. One method includes setting an EVM requirement for a transmit antenna within a set of transmit antennas of an antenna port. The EVM requirement for the transmit antenna is a EVMreq(m); EVMreq is the EVM requirement for the antenna port for a modulation; and a is based on a function of a number of transmit antennas of the antenna port. The method includes performing a transmission based on the EVM requirement.