EV-DO
The EV-DO program within the Qualcomm Research Center (QRC) has been involved in the standardization of every revision of the air interface, in addition to the research and development of implementation techniques that improve the performance and value of commercial EV-DO systems.
For example, the EV-DO team in QRC has led the industry in a number of solutions designed to improve user experience and system capacity. Examples include mobile receive diversity, advanced equalization and Reverse Link (RL) interference cancellation (IC). The EV-DO team was also the first to demonstrate a practical base station implementation of full RL IC. With this implementation, RL sector capacity increases by 65% without any modifications to existing terminals.
Another significant effort led by the QRC researchers working on EV-DO is the development and optimization of VoIP services. In 2006, the EV-DO team achieved an industry breakthrough by demonstrating 114 simultaneous VoIP calls in an isolated EV-DO sector. Moreover, several techniques and optimizations were developed to demonstrate robust VoIP operation in mobile environments.
The multi-carrier feature is also a significant contribution introduced in EV-DO Revision B. This technique greatly improves user experience and doubles system capacity due to the trunking efficiency achieved when multiple carriers are aggregated. The EV-DO team was the first to demonstrate multi-carrier EV-DO in 2007 using a software upgrade to CSM6800-based infrastructure.
Currently, the EV-DO team is researching and contributing in 3GPP2 in order to further improve system performance through techniques known as EV-DO Advanced. The goal of these advanced techniques is to further optimize the performance and user experience of EV-DO networks by low-cost upgrades. The research work on EV-DO Advanced includes dynamic network resource management through smart networks, efficient support of heterogeneous nodes, advanced receivers and multiple antenna techniques.
