wideband code division multiple access wcdma or 3gsm handset
theory of code division muitiple access communication
... transmission.THEORY OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION1INTRODUCTION TO CELLULARMOBILE RADIO COMMUNICATIONThe subject of this book is code division multiple access (CDMA) communi-cations. ... sourcecoding and channel error-correcting coding) and the corresponding signal pro-cessing techniques at the receiver.1.2 FREQUENCY DIVISION AND TIME DIVISION MULTIPLE ACCESS Multiple access schemes are ... COMMUNICATIONSpreader 2Impulsegenerator 2ChannelSpreaderKImpulsegeneratorKSpreader 1{u(1)}nImpulsegenerator 1Modulator 1Modulator 2ModulatorKEncoder 1Encoder 2EncoderK. . . .{u(2)}{u(K){v(1)}n{v(2)}n{v(1)n{a(1)}n{a(2)}n{a(K)}}}}na(1)s(1)(t)s(1)(t)s(K)(t)}n{v(2)na(2)}n{v(K)n{v(K)na(K)Figure...
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Multiple Access Protocols for Mobile Communications - GPRS, UMTS and Beyond
... EuropeRACH Random Access CHannel (GSM, UTRA transport channel)RAMA Resource Auction Multiple Access RAN Radio Access NetworkRAP Random Access ProtocolRCMA Reservation -Code Multiple Access RES Reservation ... to assign individual portions ofits resources to support multiple communications, basic multiple access techniques (suchas frequency-, time-, or code- division multiple access, with FDMA, TDMA, ... mode)NWL Network LayerOODMA Opportunity Driven Multiple Access OFDM Orthogonal Frequency -Division MultiplexingOSI Open Systems InterconnectionOVSF Orthogonal Variable Spreading Factor (UMTS)PP-CCPCH...
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Tài liệu Lab 11.2.3d Multiple Access Lists Functions (Challenge Lab) pdf
... users in the internetwork cannot forward these documents, do not allow any computers telnet nor FTP access to the Internet. Will new access control list(s) be created or will the current list(s) ... 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. _____________________________________________________________________________________ ... Inbound access list is ________ Interface __________ Outgoing access list is ________ Inbound access list is ________ Interface __________ Outgoing access list is ________ Inbound access...
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Tài liệu Chapter 12 Multiple Access docx
... polling access method12.40Figure 12.22 Time -division multiple access (TDMA)12.35Figure 12.20 Logical ring and physical topology in token-passing access method12.1Chapter 12 Multiple Access Copyright ... bands.Note12.6Figure 12.4 Procedure for pure ALOHA protocol12.24Figure 12.13 Collision and abortion in CSMA/CD12.38Figure 12.21 Frequency -division multiple access (FDMA)12.29In CSMA/CA, the ... Permission required for reproduction or display.12.25A network using CSMA/CD has a bandwidth of 10 Mbps. If the maximum propagation time (including the delays in the devices and ignoring the time...
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Báo cáo sinh học: " Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks-- optimal and suboptimal estimators" pot
... the transmissionperformance for high communication SNR, but it causes more errors for low SNR. For the transmissionschemes using CRC, the BER is even worse b e caus e long codes will reduce the ... suboptimal decentralized estimators in wireless sensor networks over orthogonal multiple- access fading channels in this paper. Considering multiple- bit quantization for digital transmission, we ... Sensor Networks. Lecture Notes in Com-puter Science, vol. 2634, (2003), p p. 162–17717. M Gastpar, Uncoded transmission is exactly optimal for a simple Gaussian “sensor” network. in 2007Information...
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báo cáo hóa học:" Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks-- optimal and suboptimal estimators" ppt
... the transmissionperformance for high communication SNR, but it causes more errors for low SNR. For the transmissionschemes using CRC, the BER is even worse b e caus e long codes will reduce the ... modulati on for all codebooks. Because the code length of the uncoded transmission is shorter than that of the coded transmission, the energy to transmiteach symbol will be higher for a given ... the redundant observations provided by multiple sensor s . However, theirperformance degrades dramatically when communication errors cannot be ignored or corrected. On the otherhand, various...
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Báo cáo hóa học: " Research Article Iterative Fusion of Distributed Decisions over the Gaussian Multiple-Access Channel Using Concatenated BCH-LDGM Codes" potx
... statistics in the decoded information from thesensors allow for the concatenation of BCH codes [39, 40]inorder to decrease the aforementioned intrinsic error floor ofsingle LDGM codes. Extensive ... reducethe error floor inherent to LDGM codes. Inspired by thisprevious work, in this paper we take a step further byanalyzing the performance of concatenated BCH-LDGMcodes for encoded data fusion ... errors perdecoded block λ motivates the inclusion of an outer sys-tematic BCH code whose error correction capability t isadjusted so as to correct the residual errors obtained in theerror...
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Báo cáo hóa học: " Research Article Partial Interference and Its Performance Impact on Wireless Multiple Access Networks" potx
... interference on multiple access networks, we propose an analytical framework tocharacterize partial interference for two representative typesof multiple access wireless networks, namely, the ... the original work is properly cited.To determine the capacity of wireless multiple access networks, the interference among the wireless links must be accurately modeled.In this paper, we formalize ... with each other, resultingin performance degradation. Therefore in the study ofwireless networks, one important performance measure isthe capacity of the network when the effects of interlinkinterference...
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báo cáo hóa học:" Multiple access communications in future-generation wireless networks" potx
... of LDGM codes permits to efficiently exploit the intrinsic spatial correlation between the information registered by the sensors, whereas BCH codes are selected to lower the error floor due ... Diversity and Transmit Beamforming” by Di Zheng and Yu-Dong Yao presents a theoretical contribution for the study of classical Slotted ALOHA random access algorithm for multi -access- point diversity ... Networking 2012,2012:45 doi:10.1186/1687-1499-2012-45Norman Abramson (norm@alohanet.com)Claudio Sacchi (sacchi@disi.unitn.it)Boris Bellalta (boris.bellalta@upf.edu)Alexey Vinel (vinel@ieee.org)ISSN...
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Báo cáo hóa học: " Research Article Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications over Indoor Fading Channels" ppt
... thecorresponding capacity with L-order receive diversity.4. CAPACITY ANALYSIS OF A TIME-HOPPING MULTIPLE ACCESS PPM OR PAM UWB SYSTEMWith more than one user active in the system, multiaccessinterference ... ofthe multiple- access interference (MAI) [10]. However, forsimplicity, an M-ary correlation receiver is typically usedeven when there is more than one active user. For PAM,only one correlation ... oneuser is present, the optimal receiver for PPM is a bank of Mcorrelation receivers followed by a detector. When more thanone link is active in the multiple- access system, the optimalPPM receiver...
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Báo cáo hóa học: " Research Article Analysis of Coded FHSS Systems with Multiple Access Interference over Generalized Fading Channels" ppt
... that the frame is bit-interleaved prior to the FHSS transmission in order to spreadburst errors in the decoder.We consider a multiple- access FHSS network of K users.The frequency band is ... practical for short-delay applicationsbecause the performance is not affected significantly by theframe size.In cellular networks, multiple access interference (MAI)may arise when more than one ... codeword given that the all-zero codeword is transmitted. In (6), wdis the number ofcodewordswithoutputweightd obtained from the weightenumerator of the code [12].In FHSS systems, the PEP...
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Báo cáo hóa học: " Research Article Slotted Gaussian Multiple Access Channel: Stable Throughput Region and Role of Side Information" pdf
... [5] for multiple- access channels. We will give an achievable rate region for all fiveside information cases listed in Section 2.4.Twomaincodeconstructions are used, namely in Theorem 1 for Case ... a multiple- access system,” IEEE Transactions onInformation Theory, vol. 34, no. 5, pp. 918–930, 1988.[5] T.M.CoverandJ.A.Thomas,Elements of Information Theory,John Wiley & Sons, New York, ... i.i.d. random codes.Specifically, each user generates a codebookC(i)containing2nRi.= SNRrinicodewords denoted as X(i)1, , X(i)SNRrini.Eachcodeword is n-length vector with i.i.d....
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