Laboratories

1. Introduction to OTA Testing

OTA stands for Over the Air. In mobile communications, it generally refers to assessment of the over-the-air performance of a device under test (DUT). Two key indicators are transmitter Total Radiated Power (TRP) and receiver Combined Total Isotropic Sensitivity (C-TIS), both expressed in dBm.

2. OTA Laboratory

The OTA laboratory of a GTG Group affiliate is built to North American CTIA OTA specifications. It provides test environments for active and passive antennas, electronically scans radiation performance, and collects and analyzes the data by computer to characterize antenna performance with high repeatability, accuracy and resolution.

3. OTA Testing Standards

GB/T 9410	YD/T 1484	YD/T 2193
3GPP TS 25.144	3GPP TS 34.114	3GPP TS 37.544
3GPP TR 25.914	3GPP TS 38.521	3GPP TR 37.902
Self Certification U2100 Radio radiated_V1.3	Self Certification GSM CS - PS Radio radiated_V1.2	Self Certification U900 Radio radiated_V1.2
CTIA Test Plan for RF Performance Evaluation of Wi-Fi Mobile Converged Devices	CTIA Test Plan for Wireless Device Over-the-Air-Performance	OGDR 12.0 LTE Device Performances

4. OTA Test Items

1. Active Testing

TRP (Total Radiated Power);

TIS (Total Isotropic Sensitivity);

NHPRP (Near-Horizon Partial Radiated Power);

NHPIS (Near-Horizon Isotropic Sensitivity);

EIRP (Equivalent Isotropically Radiated Power) / ERP (Effective Radiated Power);

PEIRP (Peak Equivalent Isotropically Radiated Power).

2. Passive Testing

Gain (dBi / dBd);

Radiation Pattern;

Input Impedance;

VSWR / Return Loss;

3D Field Strength Pattern;

3 dB Beamwidth / Front-to-Back Ratio;

Cross-Polarization Ratio / Isolation;

Directivity;

Efficiency.