Cooperative relaying has been proposed as a way to create a virtual antenna array, hence providing spatial diversity in slow fading wireless environment. From the practical implementation perspective, one needs to des...
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Cooperative relaying has been proposed as a way to create a virtual antenna array, hence providing spatial diversity in slow fading wireless environment. From the practical implementation perspective, one needs to design a relaying system that can achieve the maximum diversity order with a low system complexity. One promising candidate is to incorporate equal gain combining (EGC) technique into relaying systems and it is the main focus of this paper. In particular, the techniques of EGC and smart relaying are combined in the decode-and-forward (DF) relay processing method. It is shown that for a system with one relay and M phase-shift-keying (M-PSK) modulation, a maximum diversity order of 2m is achieved in Nakagami-m fading environment. With K relays, numerical results suggest that the diversity order is m(K + 1).
The response time required in speaker identification systems mainly depend on the amount of enrolled speakers. Thus, how to reduce the computational cost, when evaluating large speaker databases, is the key problem. T...
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The response time required in speaker identification systems mainly depend on the amount of enrolled speakers. Thus, how to reduce the computational cost, when evaluating large speaker databases, is the key problem. Thus, a ldquobag of codesrdquo algorithm is proposed, which can generate speaker models by estimating the probability distribution of each code in speech data. Experiments prove that the new configuration has substantially lower complexity than commonly used methods with comparable identification accuracy, overcoming one bottleneck in the development of speaker identification research.
The health care costs in developed countries are increasing fast due to the aging of the population. In-home monitoring of health is becoming more and more attractive both because of expected cost-savings and technica...
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The health care costs in developed countries are increasing fast due to the aging of the population. In-home monitoring of health is becoming more and more attractive both because of expected cost-savings and technical development of suitable measurement devices and wireless sensor networks. In this paper, we present on-going work about embedding health monitoring devices into ordinary homes. The developed system is targeted both for monitoring elderly and for monitoring rehabilitation after hospitalization period. The paper presents the utilized sensor network implementation, chosen set of sensors for the first test trial, as well as other design choices for the trial. In addition, further objectives about concentrating on one special case, the ubiquitous heart rate measurement, are discussed. Our objective is to install several non-contact heart rate monitors into a home environment. The designed system performed well during the trial. However, some issues, such as sensor addressing in WSN and user identification, will be better taken into account in the next trials.
The development of this project has the goal of controlling an android robot that has 17 digital servomotors; the position of each of the servomotors is controlled by pulse width modulation. The android also has a dis...
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ISBN:
(纸本)9781424444793;9781424444809
The development of this project has the goal of controlling an android robot that has 17 digital servomotors; the position of each of the servomotors is controlled by pulse width modulation. The android also has a distance sensor that allows the android to turn around when encountered with an object that obstructs its way. To implement the control of the android Max II Micro board card from Altera Company is used. This board is equipped with an Altera MAX reg II EPM2210F324C3 CPLD (complex programmable logic device). The control for the android implemented with the development board mentioned above is capable of sending 17 digital PWM signals to each one of the servomotors to control their position as well as receive and process two signals, one coming from the distance sensor and the other coming from a RF receiver module used to control the android wirelessly (if needed). Since the MAX II Micro board has connected to it a distance sensor the android is also capable of detecting obstacles at different distances and turn around or just stop walking. It is important to mention that all the circuitry needed to control the android movements, the distance sensor, and RF receiver was described using VHDL language. VHDL is one of the most common languages to describe designs in this kind of devices.
This ieeesignalprocessing Magazine (SPM) forum discusses advances, challenges, and future trends in hardware design and implementation of signalprocessing (SP) systems. The invited forum members who bring their exp...
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This ieeesignalprocessing Magazine (SPM) forum discusses advances, challenges, and future trends in hardware design and implementation of signalprocessing (SP) systems. The invited forum members who bring their expert insights are: Prof. Shuvra S. Bhattacharyya (University of Maryland, College Park), Jeff Bier [Berkeley design Technology, Inc. (BDTI)], Dr. Wanda K. Gass (Texas Instruments), Dr. Ram K. Krishnamurthy (Intel), and Prof. Edward A. Lee (Univerisity of California, Berkeley and BDTI). The moderator of the forum is Dr. Konstantinos Konstantinides (Hewlett-Packard and associate editor of SPM). Our readers may agree or disagree with the ideas discussed next. In either case, we invite you to share your comments with us by e-mailing to SPM_columns_forums@***.
Application of automated material handling system (AMHS) to the semiconductor manufacturing factories is one of the most important steps in the automation process of semiconductor business. All cassettes in the vehicl...
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Application of automated material handling system (AMHS) to the semiconductor manufacturing factories is one of the most important steps in the automation process of semiconductor business. All cassettes in the vehicle of the transportation facility can send their positioning information through this system. Nevertheless, some positioning information may still be interfered or get lost if there is any relocation of the cassette inside the effective ranges of AMHS by operators. In order to retrieve these lost cassettes only manpower is possible, and the relocation process is time wasting and inefficient. In this paper, we have implemented a clean room real-time location aware system (CRRLS) that is based on the technology of RFID (radiofrequency identification). The proposed system can reveal the positioning information of the cassette in the clean room by analyzing the received radio frequency energy information. Moreover, we establish a transmitting model of radio signal, and used this model to estimate distance between RFID tag and readers. A triangular positioning algorithm is developed to estimate the location and its 2-dimensional coordinate of the cassette. Furthermore, reusable RFID tags can save additional information sent by the transceivers and data of parameters for the production process to reduce the possibility of severe damage because of wrong parameters setting. As a result, competitive advantage of the semiconductor business can herewith greatly increase.
We present an open-source platform for wireless body sensor networks called DexterNet. The system supports real-time, persistent human monitoring in both indoor and outdoor environments. The platform utilizes a three-...
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We present an open-source platform for wireless body sensor networks called DexterNet. The system supports real-time, persistent human monitoring in both indoor and outdoor environments. The platform utilizes a three-layer architecture to control heterogeneous body sensors. The first layer called the body sensor layer (BSL) deals with design of heterogeneous body sensors and their instrumentation on the body. At the second layer called the personal network layer (PNL), the body sensors on a single subject communicate with a mobile base station, which supports Linux OS and the ieee 802.15.4 protocol. The BSL and PNL functions are abstracted and implemented as an open-source software library, called signalprocessing In Node Environment (SPINE). A DexterNet network is scalable, and can be reconfigured on-the-fly via SPINE. At the third layer called the global network layer (GNL), multiple PNLs communicate with a remote Internet server to permanently log the sensor data and support higher-level applications. We demonstrate the versatility of the DexterNet platform via several real-world applications.
This paper presents a systematic high-speed VLSI implementation of the discrete wavelet transform (DWT) based on hardware-efficient parallel FIR filter structures. High-speed 2-D DWT with computation time as low as N-...
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This paper presents a systematic high-speed VLSI implementation of the discrete wavelet transform (DWT) based on hardware-efficient parallel FIR filter structures. High-speed 2-D DWT with computation time as low as N-2/12 can be easily achieved for an N x N image with controlled increase of hardware cost. Compared with recently published 2-D DWT architectures with computation time of N-2/3 and 2N(2)/3, the proposed designs can also save a large amount of multipliers and/or storage elements. It can also be used to implement those 2-D DWT traditionally suitable for lifting or flipping-based designs, such as (9,7) and (6,10) DWT. The throughput rate can be improved by a factor of 4 by the proposed approach, but the hardware cost increases by a factor of around 3. Furthermore, the proposed designs have very simple control signals, regular structures and 100% hardware utilization for continuous images.
In this paper we present the VLSI implementation of a high-throughput enhanced Max-log-MAP processor that supports both single-binary (SB) and double-binary (DB) convolutional turbo codes. The combined hybrid-window (...
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ISBN:
(纸本)9781424429233
In this paper we present the VLSI implementation of a high-throughput enhanced Max-log-MAP processor that supports both single-binary (SB) and double-binary (DB) convolutional turbo codes. The combined hybrid-window (HW) and parallel-window (PW) MAP decoding is introduced to support arbitrary frame sizes with high throughput. A 1.28 mm(2) dual-mode (SB/DB) 2PW-1HW MAP processor is also implemented in TSMC 0.13 mu m CMOS process to verify the proposed approaches. The proposed MAP processor can be used as hardware accelerators in multistandard platform for wireless WAN with low cost and low energy.
In 2004, ISO/IEC SC29 better known as MPEG started a new standard initiative aiming at facilitating the deployment of multi-format video codec design and to enable the possibility of reconfiguring video codecs using a...
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ISBN:
(纸本)9781424429233
In 2004, ISO/IEC SC29 better known as MPEG started a new standard initiative aiming at facilitating the deployment of multi-format video codec design and to enable the possibility of reconfiguring video codecs using a library of standard components. The new standard under development is called MPEG Reconfigurable Video Coding (RVC) framework. Whereas video coding tools are specified in the RVC library, when a new decoder is reconfigured choosing in principle any (sub)-set of tools, the corresponding bitstream syntax, described using MPEG-21 BSDL schema, and the associated parser need to be respectively derived and instantiated reconfiguration by reconfiguration. Therefore, the development of an efficient systematic procedure able to instantiate efficient bitstream parsing and particularly variable length decoding is an important component in RVC. This paper introduces an efficient data flow based implementation of the variable length decoding (VLD) process particularly adapted for the instantiation and synthesis of CAL parsers in the MPEG RVC framework.
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