multiple access techniques wireless communication ppt

Ngày tải lên: 11/07/2014, 21:20

... also been growth in other sources of RF radiation from cordless phones, wireless computer communications, and other communications systems. The last general survey of RF levels in U.S. cities ... Identification of Research Needs Relating to Potential Biological or Adverse Health Effects of Wireless Communications Devices Nuclear and Radiation Studies Board Division on Earth and Life Studies DOSIMETRY ... exposure of juveniles, children, pregnant women, and fetuses, both for personal wireless devices (e.g., cell phones, wireless personal computers [PCs]) and for RF fields from base station antennas...

Ngày tải lên: 15/03/2014, 15:20

... Journal on Wireless Communications and Networking 2011, 2011:102 http://jwcn.eurasipjournals.com/content/2011/1/102 Page 5 of 19 RESEARCH Open Access Enabling location-aware quality-controlled access in ... T hroughput dynamics of TaLE-enabled Hot Spot in the presence of wireless link errors. Kim et al. EURASIP Journal on Wireless Communications and Networking 2011, 2011:102 http://jwcn.eurasipjournals.com/content/2011/1/102 Page ... applied to (i) smart communication, which chooses an appropri- ate access technology available in a specific location and/or suitable to satisfying delay or throughput con- straints for communication...

Ngày tải lên: 21/06/2014, 00:20

Ngày tải lên: 23/06/2014, 00:20

Ngày tải lên: 07/08/2014, 21:20

... However, their performance degrades dramatically when communication errors cannot be ignored or corrected. On the other hand, various wireless communication technologies aiming at achieving transmission ... bound rapidly with the increasing of the communication SNR. As expected, the MLE with AF transmission, marked as AF, is inferior to the MLE with digital communication using 4-bits quantization, ... mit one observation, to define the communication SNR in order to fairly compare the energy efficiency of the estimators with d iff er ent transmission schemes. The communication SNR is d efi ne d as γ c =...

Ngày tải lên: 20/06/2014, 04:20

... decentralized estimation for a deterministic parameter using digital communications over orthogonal multiple- access fading channels with a multiple- bit quantizer. By introducing a general messaging function, ... 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, ... IV, (2005), pp. 745–748 19. J-J Xiao, Z-Q Luo, Multiterminal source-channel communication over an orthogonal multiple access channel. IEEE Trans. Inf. Theory 53(9), 3255–3264 (2007) 20. S Cui,...

Ngày tải lên: 18/06/2014, 22:20

... Journal on Wireless Communications and Networking 2011, 2011:65 http://jwcn.eurasipjournals.com/content/2011/1/65 Page 2 of 19 RESEARCH Open Access Multihop relaying and multiple antenna techniques: ... Jacobson and Krzymień: Multihop relaying and multiple antenna techniques: performance trade-offs in cellular systems. EURASIP Journal on Wireless Communications and Networking 2011 2011:65. Submit ... relaying and multiple antenna techniques performance trade-offs in cellular systems. In Proc WPMC, Jaipur, India (December 2007) Jacobson and Krzymień EURASIP Journal on Wireless Communications...

Ngày tải lên: 21/06/2014, 01:20

... 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

... 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 doi:10.1186/1687-1499-2012-45 Norman ... “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...

Ngày tải lên: 21/06/2014, 17:20

... Journal on Wireless Communications and Networking Volume 2008, Article ID 273018, 9 pages doi:10.1155/2008/273018 Research Article Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications ... 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 ... 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...

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 ... Transactions on Communications, vol. 32, no. 5, pp. 589–597, 1984. [4] A. W. Lam and D. V. Sarwate, Multiple- user interference in FHMA-DPSK spread-spectrum communications,” IEEE Transactions on Communications, ... 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...

Ngày tải lên: 21/06/2014, 23:20

Ngày tải lên: 22/06/2014, 01:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 23/06/2014, 00:20

Ngày tải lên: 27/06/2014, 09:20

Ngày tải lên: 14/08/2014, 09:21

Ngày tải lên: 14/08/2014, 09:22

... Baey, Fladenmuller – Subject 5 MOB Subject 5 Access methods Static and dynamic access techniques 1. Static access techniques 1.1 Space-division multiple- access (SDMA) When one seeks to cover a broad ... solutions are simple to introduce, but suffer from a very low yield. You lose the multiplexing gain! 3. Dynamic access techniques Pure Aloha: the principle of Aloha is to let talk to everyone when ... η a  1. 1.3 Time Division Multiple Access (TDMA) In the traditional local networks, a physical support is sharing between several users. It is thus important to define the access rules of the media...

Ngày tải lên: 17/09/2012, 09:13

... multipath, traditionally a pitfall in wireless communications, to enhance rather than degrade the signal. MIMO systems consist of multiple transmitters and multiple receivers. For MIMO systems ... shows a smart antenna system with multiple antennas at one end of the link. These systems are also known as SIMO (single-input multiple output). Originally multiple antennas were placed at the ... 54 vii Simulation of a MIMO wireless system – John Fitzpatrick be used. However this is not very practical on a small scale. Another solution is to use multiple antennas at either the transmitting...

Ngày tải lên: 20/11/2012, 11:36