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This paper describes a time-to-digital converter (TDC) architecture with fine time resolution, self-calibration and self-testing, and these features are realized by the following: (1) Encoder circuit that ensures monotonic characteristics. (2) Self-calibration circuit for linearity improvement. (3) Stochastic architecture for fine time resolution. (4) Self-testing for reliability requirements. These...
This paper describes the timing skew compensation technique using the digital filter with our novel linear phase condition. First we describe the digital filter which can set its group delay with the arbitrary fine time resolution while it maintains the linear phase characteristics; the conventional linear phase digital filter can set its group delay with the time resolution of a half of the sampling...
Three dimensional (3-D) technologies have come under the spotlight to overcome limitations of conventional two dimensional (2-D) microprocessor implementations. However, the effect of 3-D integration with vertical interconnects in arithmetic units design is not well discussed yet. In this paper, aiming at clarifying the effectiveness of the 3-D integrated technology in arithmetic units design, fine...
The traffic adaptive 2-level active period control has been proposed for performance enhancement in cluster-based wireless sensor networks (WSNs) employing IEEE 802.15.4 medium access control (MAC) under temporal and geographical non-uniform traffic distribution. This paper proposes an adaptive backoff window control method for the traffic adaptive 2-level active period control. The proposed method...
This paper proposes an adaptive 2-level active period control method with adaptive backoff window based on traffic load in each cluster for cluster-based wireless sensor networks (WSNs) employing IEEE 802.15.4 medium access control (MAC) protocol under temporal and geographical non-uniform traffic distribution. The proposed method consists of three elements: cluster level active period control, network...
Reducing power consumption and increasing battery life of sensor nodes are important challenges for sensor networks. In this paper, we propose a simple routing protocol that constructs routes depending on a remaining battery capacity. Then, we explore a new type of sensor network with forwarder nodes and a data aggregation scheme. The forwarder node is a special node that has a large size of battery...
Communication of vehicle information to neighbor vehicles is an important factor for safe driving systems in intelligent transport system. Additionally, big-size vehicles on the real road environments may interrupt communication between vehicles. Therefore, an adequate vehicle should forward the vehicle information in the delivery of the vehicle information to neighbor vehicles. This paper proposes...
A Time-to-Digital-Converter (TDC) is to measure the interval time between two signals, and its time resolution of several pico seconds is achieved when it is implemented with advanced CMOS process [1-5]. Its applications are gradually expanding such as a phase comparator of all-digital-PLL, a sensor interface circuit, modulation circuit and demodulation circuit as well as a TDC-based ADC. The TDC...
This paper proposes an adaptive 2 level active period length control method based on traffic load in each cluster for cluster-based wireless sensor networks (WSNs) employing IEEE 802.15.4 medium access control (MAC) protocol. The proposed method consists of two active period length controls: cluster level control and network level control. In the cluster level control, cluster heads autonomously control...
This paper describes a new architecture for high-resolution digital PWM (DPWM) generator used in digitally-controlled DC-DC converters, PWM time resolution is determined by the difference between two (or more) gate delays, while that of conventional DPWM circuits is determined by gate delay itself. The proposed DPWM circuit can achieve fine time resolution with small circuits, and has low power consumption...
This paper proposes an adaptive transmit power window control scheme based on location of mobile stations and traffic load for channel state based transmissions to enhance the system performance in CDMA cellular downlink packet communications. The proposed scheme constrains the downlink packet transmissions by employing a transmit power window individually given to each mobile station. The size of...
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