Measurement of chlorophyll concentration is gaining more-and-more importance in evaluating the status of the marine ecosystem. For wide areas monitoring a reliable architecture of wireless sensors networkis required. In this paper, we present a network of smart sensors, based on ISO/IEC/IEEE 21451 suite of standards, for in situ and in continuous space-time monitoring of surface water bodies, in particular for seawater. The system…
Omnet++ Simulator
13.6 A 600μW Bluetooth low-energy front-end receiver in 0.13μm CMOS technology
One of the main goals for the next generation of radios for wireless sensor and body-area networks(WSN and WBAN) is a sub-mW receiver (RX) compliant with energy-harvested supplies. In this direction, the Bluetooth standard has introduced a low-energy operative mode (BLE) with wider channel spacing (2MHz) and relaxed blocker tolerance. The minimum sensitivity required is -70dBm but even with…
A fast AGC method for multimode zero-IF/sliding-IF WPAN/BAN receivers
This paper presents a fast mixed-signal automatic gain control (AGC) method for zero-IF/sliding-IF receivers used in wireless personal and body-area networks (WPAN/BAN). The preamble defined in Bluetooth low energy (BLE)/802.15.4 /802.15.6 specifications are as low as 1 Byte. It is a tough challenge for the zero-IF/sliding-IF receivers to perform AGC training, frequency synchronization and symbol timing estimation. By detecting the…
Chest-worn health monitor based on a bistatic self-injection-locked radar
This paper presents a chest-worn health monitor based on continuous-wave Doppler radar technology. To achieve low complexity, low power consumption and simultaneous wireless transmission of Doppler information, the radar architecture is bistaic with a self-injection-locked oscillator (SILO) tag and an injection-locked oscillator (ILO) based frequency demodulator. In the experiments with a prototype operated in the…
Blockage Robust and Efficient Scheduling for Directional mmWave WPANs
With the increase in emerging bandwidth-intensive applications, millimeter-wave (mmWave) communications in 60-GHz band have become a hot topic. There are two unique features that sharply distinguish mmWave wireless personal area networks (WPANs) from other networks using lower carrier frequencies. First, mmWave links use high-gain directional antennas to overcome the high propagation loss. Second, mmWave links are easily blocked by the human body and furniture.…
I-WBAN: Enabling Information-centric data retrieval in heterogeneous WBAN
Reliable data retrieval in Wireless Body Area Networks (WBAN) is critical in the patient monitoring and other medical services. The limitation of energy supply and the mobility of body sensors exacerbate the difficulties of efficient data transmission. This paper proposed the Information-centric data retrieval in WBAN (named by I-WBAN) to improve the reliability and efficiency, which was featured by: (i) adopting the…
An overview of ETSI TC SmartBAN MAC protocol
In this paper we introduce medium access control (MAC) protocol defined by ETSI TC (technical committee) SmartBAN (smart body area network). The key features of the protocol are a two-channel concept with different channels for data and control traffic, and a unique Multi-use Channel Access as one alternative channel access mode. The two-channel concept provides fast channel acquisition…
DMA-powered SDR processor exploiting DLP in LTE-Advanced
Software-defined radio (SDR) allows for the implementation and support of various wireless communication standards within a short development period. LTE-Advanced, which is the latest high-speed standard, demands a huge number of matrix calculations. We previously developed a digital signal processor (DSP) architecture with a direct memory access (DMA) function for exploiting data level parallelism (DLP) in LTE-Advanced…
Exploration of Centralized Car2X-Systems over LTE
Car2X-Communication is a method for data exchange between vehicles and infrastructure units to increase traffic safety and efficiency. Usually data processing and control is performed within the vehicle i.e decentralized. Centrally organized systems hardly get any attention in latest research, although they have many advantages. Since communication systems are improving, even safety-critical centralized systems become…
Investigation of Diagonal Antenna-Chassis Mode in Mobile Terminal LTE MIMO Antennas for Bandwidth Enhancement
A diagonal antenna-chassis mode is investigated in long-term evolution multiple-input-multiple-output (LTE MIMO) antennas. The MIMO bandwidth is defined in this paper as the overlap range of the low-envelope correlation coefficient, high total efficiency, and -6-dB impedance matching bandwidths. Utilizing the diagonal mode analysis, the MIMO bandwidth of the collocated MIMO antennas is improved efficiently at the…