Coexistence of Wi-Fi and LTE in unlicensed spectrum (LTE-U) is recently drawing significant concern in industry. In this paper, we investigate the Wi-Fi performance in the presence of duty cycle based LTE-U transmission on the same channel. More specifically, one LTE-U cell and one Wi-Fi basic service set (BSS) coexist by allowing LTE-U devices transmit their signals only in predetermined duty ...

Laryngeally echolocating bats avoid self-deafening (forward masking) by separating pulse and echo either in time using low duty cycle (LDC) echolocation, or in frequency using high duty cycle (HDC) echolocation. HDC echolocators are specialized to detect fluttering targets in cluttered environments. HDC echolocation is found only in the families Rhinolophidae and Hipposideridae in the Old World...

Duty cycle design is an important topic in body area networks. As small sensors are equipped with the limited power source, the extension of network lifetime is generally achieved by reducing the network energy consumption, for instance through duty cycle schemes. However, the duty cycle design is a highly complex NP-hard problem and its computational complexity is too high with exhaustive sear...

Duty-cycle MAC protocols have been proposed for wireless sensor networks (WSNs) to reduce the energy consumed by idle listening, but they introduce significant end-to-end delivery latency. Several works have attempted to mitigate this latency, but they still have a problem on handling the packet loss. The quality of the wireless channel in WSNs is quite bad, so packets are frequently lost. In t...

Most studies define a common duty cycle value throughout the wireless sensor networks (WSNs) to achieve synchronization among the nodes. On the other hand, a few studies proposed adaptation of the duty cycle according to uniform traffic conditions to decrease the energy consumption and latency. In this paper, the lifetime of the nodes based on overall energy consumption are estimated and the ef...

A duty cycle control circuit for clock signals is presented. The proposed circuit uses a rising edge detector to generate one shot output signals which have the same frequency of the input clock signal. A pulse width controllable monostable multivibrator converts the one shot signals into rectangular pulses. By the feedback control voltage from an operational amplifier, the pulse width of gener...

We study fast data collection in linear duty-cycled wireless sensor networks (WSNs). We first present a benchmark algorithm that can achieve optimality in a general case (i.e., in non-duty-cycled case). Then, based on the insights obtained in the general case, we propose an optimal algorithm and a distributed algorithm for the case when each sensor only works at one slot in a cycle in duty-cycl...

A fast-locking pulsewidth-controlled clock generator (PWCCG) based on delay locked loop is proposed in this paper. The coarse and fine delay lines and a time-to-digital detector permits the pulsewidth-controlled clock generator (PWCCG) to operate over a wide frequency range. A new dutycycle setting circuit is also presented in this paper that decides the preferred output duty cycle. Result of t...