In order to cope with huge mobile data traffic, 3GPP (3rd Generation Partnership Project) has started to discuss the architecture and optimization of a network that introduces a large amount of small base stations (sm...
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ISBN:
(纸本)9781467363617;978146736360+0
In order to cope with huge mobile data traffic, 3GPP (3rd Generation Partnership Project) has started to discuss the architecture and optimization of a network that introduces a large amount of small base stations (small cells) with higher frequency bands into the area covered by macro base stations (macro cells) with lower frequency bands. In such a network, spectral efficiency will be degraded because of the inter-cell interference among small cells. Therefore, it is important to clarify how much the transmission power of small cells is required to decrease inter-cell interference. This paper presents throughput performances as a function of small cell transmission power for two deployment scenarios. The first is the "co-channel scenario," where the same frequency bands are shared by both macro and small cells. The other is the " dedicated channel scenario," where the frequency band of macro cells is different from that of small cells. The numerical results showed that especially the cell-edge user throughput decreases significantly as the transmission power of small cells decreases. In addition, the co-channel scenario outperforms the dedicated channel scenario regardless of the transmission power of small cells, however, higher cell-edge user throughput can be achieved in the dedicated channel scenario compared to that in the co-channel scenario when the traffic offloading technique is introduced.
In this paper, a time division multiple access (TdMA) basebanddesign for multi-biosensor nodes to a central processing node communication is proposed. The communication protocol is achieved by introducing the control...
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ISBN:
(纸本)9781479947805
In this paper, a time division multiple access (TdMA) basebanddesign for multi-biosensor nodes to a central processing node communication is proposed. The communication protocol is achieved by introducing the control codes of tag/data type and synchronization reference and the bit error rate (BER) is reduced by using the multiple reading technique. The designed TdMA baseband system is implemented by a FPGA of Altera Cyclon II with burning the designed verilog codes in it. The resulted performances are verified with transmissiondata rate of 4Mbps based on 64MHz system clock.
Tree segmentation is an important step in tree reconstruction from scanneddata. A new method is presented for automatic extraction of single objects from a complex scene. The proposed method can be used as a solution...
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In case of an emergency event (e.g., earthquake, storm, flood) cultural heritage and archeological monuments must be particularly cared because of their inestimable value and the intrinsic greater fragility. Morpholog...
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ISBN:
(纸本)9781509052349
In case of an emergency event (e.g., earthquake, storm, flood) cultural heritage and archeological monuments must be particularly cared because of their inestimable value and the intrinsic greater fragility. Morphological surveys must be executed immediately for quick identification of damages so that the needed operations can be planned and performed in the shortest timeframe. The survey, to be accurate and useful to the aim, must use the most modern technologies (laser scanner, 4k video, high resolution pictures) but, considering the hostility of the environment, to process all the surveyeddata on site in real time is practically impossible. Thus, a very efficient telecommunication system based on multiple segments and QoS assurance must be set up to send the collecteddata in real time to a remote location, equipped with powerful processing capability and adequate staff to perform evaluations and to provide support to decisions. This paper describes a project idea that analyzes the survey methodology and the technical feasibility of the telecommunication network.
Time-of-Flight 3d imaging systems are promising transceivers for image sensor based optical communication. 3d sensing based on Time-of-Flight is the most miniaturizeddepth imaging technology available and is currentl...
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ISBN:
(纸本)9781467389990
Time-of-Flight 3d imaging systems are promising transceivers for image sensor based optical communication. 3d sensing based on Time-of-Flight is the most miniaturizeddepth imaging technology available and is currently being integrated into consumer electronics such as smart phones. Optical line-of-sight communication with a depth imaging system offers complete location-awareness of the communication partner. This enables new opportunities in fields like secure authentication, augmented reality or vehicle to vehicle communication. We show how Time-of-Flight systems are capable of using phase shift keying of pulsed light (PLPSK) to transmit data over a line-of-sight connection. PLPSK is still unexplored in the domain of image sensors and enables Time-of-Flight sensors to transmit multiple bits per frame at rates of over 7 kHz. A serious problem however are asynchronous modulation signals, causing frequent transmission errors and impairing proper communication. In this work, we formulate anddiscuss the severity of the problem and propose a synchronization procedure. We evaluate our solution with a prototype system, and show that it is possible to reach a synchronization success rate of nearly 100% over a distance of 9 meter.
For decades, morphological research on human faces was performed either on the living subject, or by means of 2d photographs. Within the last few years and with the development of new systems we are now able to produc...
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