multiple access radio protocol

Ngày tải lên: 23/06/2014, 01:20

... Multiple Access RAN Radio Access Network RAP Random Access Protocol RCMA Reservation-Code Multiple Access RES Reservation State RF Radio Frequency RHS Right Hand Side (of an equation) RLC Radio ... 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 ... 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...

Ngày tải lên: 02/03/2013, 16:59

Ngày tải lên: 27/06/2014, 15:20

... Outgoing access list is ________ Inbound access list is ________ Interface __________ Outgoing access list is ________ Inbound access list is ________ Interface __________ Outgoing access ... CANNOT use a web browser to access (http protocol) the intranet server. [ ] Verify that the computers from the Internet (host 3) CANNOT use a web browser to access (http protocol) the intranet ... CANNOT use a web browser to access (http protocol) the intranet server. [ ] Verify that the computers from the Internet (host 3) CANNOT use a web browser to access (http protocol) the intranet...

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 ... bands. Note 12.6 Figure 12.4 Procedure for pure ALOHA 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 ... level during transmission, idleness, or collision 12.9 Figure 12.5 Vulnerable time for pure ALOHA protocol 12.23 Figure 12.12 Collision of the first bit in CSMA/CD 12.17 A slotted ALOHA network...

Ngày tải lên: 16/02/2014, 20:20

... 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 ... 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 ... 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. 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

... ’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. ... 2005. [38] W. Zhong and J. Garcia-Fria, “Joint source-channel coding of correlated senders over multiple access channels,” in Proceedings of the Allerton Conference on Communication, Control, and...

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, ... that a packet is received with error. For illustration, we choose the MAC and PHY protocols to be 802.11b with basic access scheme and 1Mbps DBPSK. Our model can be readily extended to consider other EURASIP...

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 are ... (CTS) handshaking [10, 11]. Examples of contention protocols are Carrier Sense Multiple Access (CSMA) [9] and MACA [10]. In contention-free protocols, nodes get unique time slots, frequency channels, ... although the protocol design itself is TDMA-based, it supports network dynamics and is therefore compared to the related contention-based protocols. 3. Energy Overhead in Channel Access MAC protocol...

Ngày tải lên: 21/06/2014, 11:20

... 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 ... “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...

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 ... 2001. [15] J. Cui and A. U. H. Sheikh, “Outage probability of cellular radio systems using maximal ratio combining in the presence of multiple interferers,” IEEE Transactions on Communications, vol....

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

... 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...

Ngày tải lên: 22/06/2014, 01:20

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Ngày tải lên: 23/06/2014, 00:20