Effective October 1, 2012, QUALCOMM Incorporated completed a corporate reorganization in which the assets of certain of its businesses and groups, as well as the stock of certain of its direct and indirect subsidiaries, were contributed to Qualcomm Technologies, Inc. (QTI), a wholly-owned subsidiary of QUALCOMM Incorporated. Learn more about these changes

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HSPA+ Advanced

Uplink Transmit Diversity

Uplink transmit diversity (ULTD) schemes employ more than one transmit antenna at the user equipment (UE) to improve the uplink transmission performance.

Benefits of ULTD schemes include:

  • Reducing the UE transmit power
  • Increasing the cell coverage range
  • Increasing the UE data rate
  • Or a combination of the above

Qualcomm Research has performed extensive research in this area including systems simulations, prototyping, lab tests and Over The Air (OTA) performance evaluations. A detail of this research is available in the video and whitepaper on this page.

Qualcomm was also the first in the industry to demonstrate Closed Loop ULTD performance gains for HSPA (at MWC 2010.) The feature was standardized in 3GPP Release 11.