Over-the-Air (OTA) Testing

The total power radiated by the antenna when connected to a transmitter. It is measured by integrating the Effective Isotropic Radiated Power (EIRP) over a full spherical surface.

• Key Use: Verifying device output power and antenna efficiency.
• Measurement: Performed in an anechoic chamber using a 3D scanning system.
• Impact: Low TRP indicates poor antenna design, leading to reduced uplink range and dropped calls.

A measure of the receiver's average sensitivity over a full sphere. It integrates the Effective Isotropic Sensitivity (EIS) across all angles to provide a single figure of merit for radiated receiver performance.

• Key Use: Evaluating how well a device can detect weak signals from any direction.
• Measurement: Requires a calibrated spherical radiation pattern of the device's receiver chain.
• Impact: Poor TIS directly correlates with dropped calls and failed connections at the cell edge.

Evaluates the maximum achievable data rate of a multi-antenna system under radiated conditions. The test sweeps downlink power to find the sensitivity point where throughput drops below a threshold, often 95% of max.

• Key Use: Characterizing real-world MIMO performance and antenna correlation.
• Test Setup: Uses a multi-probe anechoic chamber to create a controlled multipath environment.
• Impact: Reveals degradation from antenna coupling that is invisible in conducted tests.

A statistical metric representing the minimum performance a user can expect at a certain probability, typically 50th or 95th percentile, over the full sphere. It accounts for the device's directional weaknesses.

• Key Use: Ensuring consistent performance regardless of device orientation.
• Calculation: Cumulative Distribution Function (CDF) of EIRP or EIS over all solid angles.
• Impact: A high 95th-percentile EIRP ensures robust uplink even when the device is held in a non-ideal position.

A radiated metric quantifying the amount of power leaking into adjacent frequency channels due to transmitter non-linearity. It is measured over-the-air to include the antenna's filtering and impedance matching effects.

• Key Use: Validating compliance with 3GPP spectral emission masks.
• Measurement: Ratio of power in the assigned channel to power in an offset channel.
• Impact: Poor ACPR causes interference to other users and violates regulatory requirements.

A measure of modulation accuracy that quantifies the deviation of measured constellation points from their ideal positions. OTA EVM includes distortion from the entire radiated path, including the antenna.

• Key Use: Diagnosing transmitter linearity and phase noise issues.
• Measurement: Demodulated signal compared to an ideal reference waveform.
• Impact: High EVM limits the ability to use high-order modulation schemes like 256-QAM, reducing peak data rates.

The foundational lab process that recreates real-world radio impairments—multipath fading, Doppler shift, and path loss—in a controlled, cabled environment. A channel emulator generates the mathematical channel models that an OTA test system then radiates into an anechoic chamber, providing repeatable, standardized conditions that are impossible to achieve in field testing.

A specialized form of channel emulation that replicates the complex, multi-antenna propagation environment. It models spatial correlation between antenna elements, cross-polarization effects, and the full channel matrix to validate beamforming, spatial multiplexing, and diversity combining algorithms in massive MIMO devices under realistic OTA conditions.

A hybrid testing paradigm where a physical device under test (DUT), such as a gNB or UE modem, is integrated into a real-time virtual simulation environment. The simulator generates the network and channel conditions, which are then radiated to the DUT via an OTA chamber, enabling validation of closed-loop algorithms like adaptive modulation and coding without a full physical network deployment.

The specific technique of artificially introducing signal power fluctuations into a test signal to evaluate receiver robustness. It replicates:

• Fast fading: Rapid amplitude changes from constructive/destructive multipath interference.
• Slow fading: Shadowing from large obstructions.
• Frequency-selective fading: Unequal attenuation across the signal bandwidth. This is a core component of any OTA test setup for mobile devices.

A simulation-based methodology that replaces physical drive tests by emulating network conditions and user mobility in a lab. A propagation model and user mobility model feed a channel emulator, which radiates the dynamically changing signal to a device in an OTA chamber. This allows for repeatable, scripted testing of handover performance, throughput, and call stability across thousands of virtual routes.

A testing method where recorded real-world network data—such as RF measurements, call traces, and GPS coordinates—is injected into a simulator to recreate a specific field event in an OTA chamber. This allows engineers to reproduce and debug a rare network failure or performance anomaly with absolute repeatability, bridging the gap between field observations and lab analysis.