Proper lab testing requires very careful control and, above all, repeatability. While a live TD-LTE radio channel is reciprocal by nature, it is neither a controllable nor a repeatable scenario, and can’t be created on a lab bench located near a design engineer. Controlling the RF scenario means disaggregating the uplink and downlink channels, which might a potential issue when replicating the reciprocal nature of the TD-LTE radio channel. New methods of implementing radio channel emulation mitigate that issue and the associated risk of receiver failures in the field.
The author Nigel Wright is in charge of Wireless Product Marketing and Corporate Marketing at Spirent Communications.