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This paper presents an FPGA-based prototype of the dual link algorithm that maximize the achievable weighted sum rate for MIMO interference network. The iterative algorithm is fast monotone convergent but it must be completed quickly through pilot signaling. Therefore we propose an FPGA-based implementation, targeting software defined radio (SDR) platforms, that is designed to rapidly process the...
This paper presents a simple method of internal channel calibration for MIMO interference networks to maintain TDD channel reciprocity. The method works for algorithms requiring channel reciprocity. In particular, it is shown how the method works for the distributed implementation of the Dual Link algorithm, which is a very fast and provably convergent algorithm for optimal interference management.
Wireless power transfer (WPT) in the range of 10 to 100mW [1] is widely used in impiantale medical devices (IMDs) to eliminate the use of a battery. Due to load and coupling variations, the output voltage of the rectifier VOUT is not steady. In [1-2], a 1X/2X reconfigurable rectifier was reported to uphold VOUT when the coupling coils move apart. In [3], VOUT is regulated by the transmitter with feedback...
A 13.56MHz wireless power transfer system with a 1X/2X reconfigurable resonant regulating (R3) rectifier and wireless power control for biomedical implants is presented. Output voltage regulation is achieved through two mechanisms: the local PWM loop of the secondary side controls the duty cycle of switching the rectifier between the 1X and 2X modes; and to adapt to load and coupling variations, the...
IP multicast originally works in any source multicast (ASM) that comes with great burden and dynamics on the backbone routers and weakness in inter-domain scalability. It also brought serious security and management problems. In contrast, source-specific multicast (SSM) has been recognized as a simple, scalable and secure method, especially in inter-domain multicast. However, its applicability to...
Congestions in many-to-many videoconferencing are usually caused by multiple senders. Judging the congestion links and determining the adjusting bit rate of senders which caused the congestions are the two issues in congestion control. In this paper, we propose one multicast congestion control scheme based on packets transmission model of shared multicast tree. The end-to-end packet loss rates are...
Congestions in many-to-many videoconferencing are usually caused by multiple senders, the congestion information feedback, bottleneck link judge and sending rate adjust are much different from one-to-many multicasting. In this paper, we propose one multicast congestion control scheme based on end-to-end tomography (ET-MCC) for many-to-many videoconferencing. The end-to-end packet loss rates are measured...
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