Hsin-Yuo Liu

Bluetooth Coexistence with 4G Broadband Wireless Networks

Multi-radio devices equipped with both Bluetooth and 4G broadband wireless technologies such as WiMAX or LTE are expected in the market soon. The spectrum available for 4G networks include the 2.3 GHz and 2.5 GHz frequency bands, both at close proximity to the 2.4 GHz ISM band where Bluetooth radio operates in. Several common usage cases require the simultaneous operations of co-located Bluetooth and 4G radios. However, State of Art filter/antenna technologies are unable to support co-located 4G transmissions and Bluetooth receptions at the same time. In this paper, we discuss a simple time domain coexistence solution that has low complexity and is easy to implement. Experiment results using off-the-shelf Bluetooth/WiMAX radios show that the proposed solution can well support common coexistence usage cases.

RF Concurrency Performance Study for Integrated WiFi Radio

We investigate issues associated with integrated radio design. Multiple constraints (e.g., due to interference or component sharing) may prohibit integrated radios from operating at the same time instance. We examine constraints defined by integrated radio RF concurrency capability, and study WiFi performance under different radio RF concurrency levels. We performed detailed simulation study for WiFi/WiMAX integrated radios. The insight obtained from our study can help evaluate the tradeoff between integrated radio design and performance of associated networks.