multiple access techniques for wireless communication wikipedia

Ngày tải lên: 11/07/2014, 21:20

... Journal on Wireless Communications and Networking Volume 2007, Article ID 64238, 8 pages doi:10.1155/2007/64238 Research Article An Adaptive Time-Spread Multiple- Access Policy for Wireless Sensor ... transmission u → v (therefore, these nodes belong in S v ∪{v}−{u})in time slot i for which i/ ∈ Ω χ (therefore, these nodes belong in O c i,u →v ) and for which nodes the most recent attempt for transmission ... desirable effect for the efficient operation for some sensor networks. The analytical results provided in this paper derive a certain value for the access probability that al- lows for small convergence...

Ngày tải lên: 22/06/2014, 19:20

... interests include multiple access techniques, estimation theory, multi-user detection and channel modeling. “I am extremely grateful to my parents for the sacrifices they have made and for imparting ... of wireless telecommunications, a number of trends are gaining widespread popularity. Among these is the explosion of interest in multi-carrier communications, and its application to wireless multiple- access. ... mobiles from TDMA (time division multiple access) to DS-CDMA (direct sequence code division multiple access) to MC-CDMA to OFDM, while maintaining a common hardware platform. In this chapter, we demonstrate...

Ngày tải lên: 02/03/2013, 16:59

... 44 2.5.3 Wireless Local Area Network (WLAN) Standards 46 2.6 Summary 48 3 Multiple Access in Cellular Communication Systems 49 3.1 Multiple Access and the OSI Layers 49 3.2 Basic Multiple Access ... Protocol for Hybrid CDMA/TDMA 12 1.4.1 Why Combine CDMA and PRMA? 12 1.4.2 Hybrid CDMA/TDMA Multiple Access Schemes 14 1.4.3 Literature on Multiple Access Protocols for Packet CDMA 15 1.4.4 Access ... individual portions of its resources to support multiple communications, basic multiple access techniques (such as frequency-, time-, or code-division multiple access, with FDMA, TDMA, and CDMA as their...

Ngày tải lên: 02/03/2013, 16:59

... circuits. Fundamentals of microfabrication techniques employed for making AlN CMR are briefly introduced. Different methods for arraying these devices and form either electrically or mechanically ... increasing recent interest in wireless applications [41–43] has generated new efforts to miniaturize and integrate the off-chip passives needed for filtering and frequency generation in communication circuits. ... therefore enabling multiple frequencies of vibration on the same silicon chip and greatly reducing manufacturing tolerances to film thicknesses. In general, the equivalent circuit representation for...

Ngày tải lên: 30/03/2014, 07:20

Ngày tải lên: 27/06/2014, 15:20

Ngày tải lên: 13/08/2014, 03:20

Ngày tải lên: 26/10/2014, 14:08

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 23/06/2014, 00:20

Ngày tải lên: 23/06/2014, 00:20

... Figure P.2). For example, the physical layer is responsible for the reliable and efficient deliv- ery of information bits. The MAC layer is responsible for the resource man- agement among multiple ... exp,, () = () - () -ã ã tptt2 6 BASIC CONCEPTS IN WIRELESS COMMUNICATIONS Channel-Adaptive Technologies and Cross-Layer Designs for Wireless Systems with Multiple Antennas Theory and Applications Vincent ... design: the information-theoretic approach and the practical Routing MAC PHY Routing MAC PHY Communication entity Communication entity Physical medium Figure P.2. Layered architecture of communication...

Ngày tải lên: 01/06/2014, 07:54

... we st ud ie d decentralized estimation for a deterministic parameter using digital communications over orthogonal multiple- access fading channels with a multiple- bit quantizer. By introducing ... log-likelihood function for estimating θ, which can be used for any messaging function c(x) , no matter when it describes analog or digital communications. For digital communications, c(x) is ... suboptimal decentralized estimators in wireless sensor networks over orthogonal multiple- access fading channels in this paper. Considering multiple- bit quantization for digital transmission, we develop maximum...

Ngày tải lên: 18/06/2014, 22:20

... log-likelihood function for estimating θ, which can be used for any messaging function c(x) , no matter when it describes analog or digital communications. For digital communications, c(x) is ... communication SNR, but it causes more errors for low SNR. For the transmission schemes using CRC, the BER is even worse b e caus e long codes will reduce the transmission energy per symbol. For ... training symbols will reduce the energy for the data symbols when the energy for transmitting an observation is fixed. Our simulations show that the best performance is obtained when L p = 2. This...

Ngày tải lên: 20/06/2014, 04:20

... introduces the d ata processing techniques for a wireless data communication via mud, which includes the down-hole part and the surface part. As for the down-hole data processing techniques, data encod- ing ... 2011:45 http://asp.eurasipjournals.com/content/2011/1/45 Page 8 of 8 RESEARC H Open Access Data processing techniques for a wireless data transmission application via mud Qingjie Zhao * , Baojun Zhang ... Processing Workshop on Signal Processing Advances in Wireless Communications,5–8 (1997) 8. JH Zhao, LY Wang, F Li, YL Liu, An effective approach for the noise removal of mud pulse telemetry system,...

Ngày tải lên: 21/06/2014, 00:20

... Standard for Infor- mation Technology—Telecommunications and information exchange between systems-Local and metropolitan area net- works-Specific requirements—part 11: Wireless LAN Medium Access ... for Higher Throughput, 2009. [2] IEEE 802.11e WG, IEEE Standard for Information Tech- nology—Telecommunications and Information Exchange Between Systems—LAN/MAN Specific Requirements—part 11 Wireless ... Standard for Information Technology—Telecommunications and Information Exchange between systems-Local and metropolitan area networks-Specific Requirements—part 11 :Wireless LAN Medium Access Control...

Ngày tải lên: 21/06/2014, 05:20

... on multiple access networks, we propose an analytical framework to characterize partial interference for two representative types of multiple access wireless networks, namely, the IEEE 802.11 Wireless ... performance. In this paper, our focus is to develop analytical mod- els with tractable solutions for various types of wireless multiple access networks which can accurately capture the performance ... Wireless Communications and Networking Volume 2010, Article ID 735083, 20 pages doi:10.1155/2010/735083 Research Article Partial Interference and Its Performance Impact on Wireless Multiple Access...

Ngày tải lên: 21/06/2014, 11:20

... contention-free protocols are Time Division Multiple Access (TDMA) [12], Frequency Division Multiple Access (FDMA) [13], and Code Division Multiple Access (CDMA) [14]. The contention protocols ... determined for the High Rate (HR) platform utilizing Nordic Semiconductor nRF2401A transceiver and for the Low Rate (LR) platform utilizing TI CC1000 transceiver. The results for the HR platform are ... Performance analysis of IEEE 802.15.4 and ZigBee for large-scale wireless sensor network applications,” in Proceedings of the 3rd ACM International Workshop on Per- formance Evaluation of Wireless...

Ngày tải lên: 21/06/2014, 11:20

... acceptance. Fully formatted PDF and full text (HTML) versions will be made available soon. Multiple access communications in future-generation wireless networks EURASIP Journal on Wireless Communications ... in Multiple Access Communications such as new cooperative MAC protocols; spectrum sharing, and channel assignment techniques for cognitive radio networks; new results on PHY layer multiple access ... nonasymptotic method for implementation of proportional differentiated admission control. The article “Polarization Division Multiple Access With Polarization Modulation for LOS Wireless Communications”...

Ngày tải lên: 21/06/2014, 17:20

... demonstrate reliable performance for synthetic channels with stationary parameters, performance, and complexity, investigations for realistic channels have not been carried out for these methods. Based ... pages doi:10.1155/2009/368209 Research Article Channel MAC Protocol for Opportunistic Communication in Ad Hoc Wireless Networks Manzur Ashraf, Aruna Jayasuriya, and Sylvie Perreau Institute for Telecommunications Research, Univers ... throughput. We assume the same P for all nodes. Throughput performance of the aforementioned models for Channel MAC is presented in Figure 5. The results are shown for a different numbers of node...

Ngày tải lên: 21/06/2014, 22:20