TD-LTE: testing times for MIMO beamforming: Page 4 of 4

May 28, 2012 // By Nigel Wright, Spirent Communications
The time-division flavor of LTE, commonly known as TD-LTE, has some powerful supporters and has been gathering media attention recently. While much initial focus for TD-LTE is on Asia, the technology looks likely to be adopted worldwide by operators with unpaired spectrum, such as incumbent WiMAX and TD-SCDMA licensees, who are looking to get in on the growing LTE ecosystem.
the deployment of mobile subscriber services. The promises of TD-LTE are tightly coupled to the deployment of a combination of complex radio antenna techniques. With the complexity of the problem comes complexity and potential risk in the testing process as well.

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.

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