space division multiple access

Ngày tải lên: 23/06/2014, 01:20

Ngày tải lên: 22/06/2014, 23:20

Ngày tải lên: 27/06/2014, 14:20

... 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 Schemes 53 3.3 Medium Access Control in 2G Cellular ... 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 ... 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

... 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

... actually consists of two simplex channels. Frequency division multiple access (FDMA) and time division multiple access (TDMA) are the two major access techniques used to share the available band- width ... Code Division Multiple Access Communication, by Kamil Sh. Zigangirov ISBN 0-471-45712-4 Copyright  2004 Institute of Electrical and Electronics Engineers 1 THEORY OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION Kamil ... corresponding signal pro- cessing techniques at the receiver. 1.2 FREQUENCY DIVISION AND TIME DIVISION MULTIPLE ACCESS Multiple access schemes are used to allow many mobile users to share simultane- ously...

Ngày tải lên: 01/06/2014, 11:27

... 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, the proposed ... 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 ... cate that 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...

Ngày tải lên: 18/06/2014, 22:20

... log-likelihood function. However, because the log-likelihood function shown in (11) is non-concave and has multiple extrema, we need to find all its local maxima to get the global maximum. Exhaustive searching ... therein). They reduce the observation noise by exploiting the redundant observations provided by multiple sensor s . However, their performance degrades dramatically when communication errors cannot ... diversity combining reduces the bit error rate (BER), it requires that the signals transmitted from multiple sensors are identical, which is not true in the context of WSNs due to the observation...

Ngày tải lên: 20/06/2014, 04:20

... 686–691. [15] Z. Chair and P. K. Varshney, “Optimal data fusion in multiple sensor detection systems,” IEEE Transactions on Aerospace and Electronic Systems, vol. 22, no. 1, pp. 98–101, 1986. [16] ... ’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. 822–833, 2007. [25] ... Zhao, W. Zhong, and J. Garcia-Frias, “Transmission of correlated senders over a Rayleigh fading multiple access channel,” Signal Processing, vol. 86, no. 11, pp. 3150–3159, 2006. [37] W. Zhong, H....

Ngày tải lên: 21/06/2014, 07:20

... 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 ... impact of interference on multiple access networks, we propose an analytical framework to characterize partial interference for two representative types of multiple access wireless networks, ... demonstrate that it is important to model the partial interference effects while analyzing wireless multiple access networks. This is because such considerations can result in not only significant quantitative...

Ngày tải lên: 21/06/2014, 11:20

... article “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 ... frequency offset (CFO) estimation in the uplink of multiuser multiple- input multiple- output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Conventional maximum likelihood ... 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

... 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 of a multiple access UWB system with PAM over a multipath fading channel with L = 4, m = 0.65, K = 200, G = 100, and P x =−11 dBm. The instantaneous capacity for a multiple access UWB system...

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 ... 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 ... 346730, 9 pages doi:10.1155/2008/346730 Research Article Analysis of Coded FHSS Systems with Multiple Access Interference over Generalized Fading Channels Salam A. Zummo Department of Electrical...

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 ... pp. 1073– 1096, 2003. [9] D. N. C. Tse, P. Viswanath, and L. Zheng, “Diversity- multiplexing tradeoff in multiple- access channels,” IEEE Transactions on Information Theory, vol. 50, no. 9, pp. ... 2008, Article ID 695894, 11 pages doi:10.1155/2008/695894 Research Article Slotted Gaussian Multiple Access Channel: Stable Throughput Region and Role of Side Information Vaneet Aggarwal 1 and...

Ngày tải lên: 21/06/2014, 23:20

... Since ∇f ∈ R 2 , the subspace orthogonal to ∇f will be a one-dimensional subspace. Since the vector z = [−f x , f r ] T is orthogonal to ∇f , then all the vectors in the subspace orthogonal to ∇f ... 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...

Ngày tải lên: 22/06/2014, 01:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 23/06/2014, 00:20

Ngày tải lên: 23/06/2014, 00:20