wireless multiple access protocols wikipedia

... Importance of Multiple Access Protocols 59 3.4.2 Medium Access Control in CDMA 60 3.4.3 Conflict-free or Contention-based Access? 62 3.5 Review of Contention-based Multiple Access Protocols 63 3.5.1 ... with multiple access protocols, which govern access to these resources. The basic multiple access schemes are briefly described further below in this section, and the importance of the multiple access ... 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...

Ngày tải lên: 02/03/2013, 16:59

... analyzing the performance of wireless multiple access protocols. 8. Conclusion In this paper, we have introduced the notion of partial inter- ference in wireless multiple access systems and illustrated the ... 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 ... 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

Ngày tải lên: 27/06/2014, 15:20

... optimal and suboptimal decentralized estimators in wireless sensor networks over orthogonal multiple- access fading channels in this paper. Considering multiple- bit quantization for digital transmission, ... the separate source-channel coding scheme is optimal in fading channels with orthogonal multiple- access protocols, which outperforms AF transmission, a simple joint source-channel coding scheme. In ... versions will be made available soon. Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks optimal and suboptimal estimators EURASIP Journal on...

Ngày tải lên: 18/06/2014, 22:20

... for wireless sensor networks— part I: G aus s ian case. IEEE Trans. Signal Process. 54(3), 1131–1143 (2006) 5. A Ribeiro, GB Giannakis, Bandwidth-constrained d is t r ibu t ed estimation for wireless ... observations provided by multiple sensor s . However, their performance degrades dramatically when communication errors cannot be ignored or corrected. On the other hand, various wireless communication ... Available: http://en .wikipedia. org/wiki/Mean value theorem 31. X Wang, C Yang, Optimal transmission codebook design in fading channels for decentralized estima- tion in wireless sensor networks....

Ngày tải lên: 20/06/2014, 04:20

... “Polarization Division Multiple Access With Polarization Modulation for LOS Wireless Communications” by Bin Cao, Qin-Yu Zhang, and Lin Jin discusses a potential multiple access and modulation ... 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 ... full text (HTML) versions will be made available soon. Multiple access communications in future-generation wireless networks EURASIP Journal on Wireless Communications and Networking 2012, 2012:45...

Ngày tải lên: 21/06/2014, 17:20

... category of allocation-based protocols are the time-spread multiple- access (TSMA) protocols which have been the focus of an increased research volume in the last decade. These protocols have no coordination ... 2006. [24] S. Basagni and D. Bruschi, “A logarithmic lower bound for time-spread multiple- access (TSMA) protocols, ” Wireless Net- works, vol. 6, no. 2, pp. 161–163, 2000. [25] D. Miorandi, H P. ... 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...

Ngày tải lên: 22/06/2014, 19:20

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Ngày tải lên: 11/07/2014, 21:20

... Outgoing access list is ________ Inbound access list is ________ Interface __________ Outgoing access list is ________ Inbound access list is ________ Interface __________ Outgoing access ... Verify the Access Lists a. Now that the access lists have been applied, they need to be verified. First, verify what lists have been defined. From a CLI session on one of the routers with access ... of the routers with access lists, display the access lists with the Boaz#show ip access- lists command. Record the information about one of the access lists. _____________________________________________________________________________________...

Ngày tải lên: 18/01/2014, 05:20

... polling access method 12.40 Figure 12.22 Time-division multiple access (TDMA) 12.35 Figure 12.20 Logical ring and physical topology in token-passing access method 12.1 Chapter 12 Multiple Access Copyright ... protocol 12.24 Figure 12.13 Collision and abortion in CSMA/CD 12.38 Figure 12.21 Frequency-division multiple access (FDMA) 12.29 In CSMA/CA, the IFS can also be used to define the priority of a station...

Ngày tải lên: 16/02/2014, 20:20

... of consumers from paid access services to FreeNet access is significant, this will cannibalize the access revenues earned by service providers offering wireline or wireless access services. These ... communication systems (PCS) 12 and used technologies such as time division multiple access (TDMA), code division multiple access (CDMA) and global system for mobile-communications (GSM). From 1995 ... experience with using wireless broadband access services. In addition to the FreeNet movement, there are a number of service providers now looking at using WiFi as the basis for wireless access over broad...

Ngày tải lên: 15/03/2014, 22:20

... (ICASSP ’07),pp. 541–544, April 2007. [24]W.LiandH.Dai,“Distributeddetectioninwirelesssensor networks using a multiple access channel,” IEEE Transactions on Signal Processing, vol. 55, no. 3, pp. ... and T. Kwon, “A novel cluster-based cooperative MIMO scheme for multi-hop wireless sensor networks,” Eurasip Journal on Wireless Communications and Networking, vol. 2006, Article ID 72493, 9 pages, ... network,” Eurasip Journal on Wireless Communications and Networking, vol. 2010, Article ID 343690, 12 pages, 2010. [12] W. K. G. Seah, A. E. Zhi, and H. P. Tan, Wireless sensor networks powered...

Ngày tải lên: 21/06/2014, 07:20

... the capacity analysis given in Section 3 for a single user to be extended to a multiple- access system. 4.1. Multiple- access interference model Asgivenin(4), the received signal is modeled as r(t) = K  k=1 L  l=1 a lk (t)X (k) l  t ... active in the multiple- access system, the optimal PPM receiver has a complex structure that takes advantage of all receiver knowledge regarding the characteristics of the multiple- access interference ... capacity and number of users for a multiple access UWB system with PPM over a multipath fading channel, L = 2, m = 0.65, G = 100, P x =−11 dBm, and SNR = 15 dB. a multiple access UWB system with PPM...

Ngày tải lên: 21/06/2014, 22:20

... spread-spectrum multiple- access communications over fading channels,” IEEE Transactions on Communications, vol. 30, no. 5, part 2, pp. 996–1009, 1982. [3] G. Einarsson, “Coding for a multiple- access frequency- hopping ... Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008, Article ID 346730, 9 pages doi:10.1155/2008/346730 Research Article Analysis of Coded FHSS Systems with Multiple Access Interference ... prior to the FHSS transmission in order to spread burst errors in the decoder. We consider a multiple- access FHSS network of K users. The frequency band is divided into Q bands and users transmit...

Ngày tải lên: 21/06/2014, 23:20

... regarding the traffic on the stability performance of Gaussian multiple- access channels. We will focus our attention on a slotted Gaussian multiple- access channel with K users sending bursty data to a ... L. Zheng, “Diversity- multiplexing tradeoff in multiple- access channels,” IEEE Transactions on Information Theory, vol. 50, no. 9, pp. 1859– 1874, 2004. 6 EURASIP Journal on Wireless Communications ... and T. P. Coleman, “Capacity of time-slotted ALOHA packetized multiple- access systems over the AWGN channel,” IEEE Transactions on Wireless Communication, vol. 3, no. 2, pp. 486– 499, 2004. [4]...

Ngày tải lên: 21/06/2014, 23:20

... pages doi:10.1155/2008/476125 Research Article Power and Resource Allocation for Orthogonal Multiple Access Relay Systems Wessam Mesbah and Timothy N. Davidson Department of Electrical and Computer ... J. Wang We study the problem of joint power and channel resource allocation for orthogonal multiple access relay (MAR) systems in order to maximize the achievable rate region. Four relaying strategies ... reproduction in any medium, provided the original work is properly cited. 1. INTRODUCTION In multiple access relay (MAR) systems, several source nodes send independent messages to a destination...

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