wireless multiple access protocols in mobile computing

... extremely large in the case of unconstrained channel access, resulting in a low inherent statistical multiplexing gain. By combining CDMA with PRMA, it is possible to control the access of users ... (P loss ) max in multiples of σ K d Hamming distance d il Interleaving depth d min Minimum Hamming distance e Error correcting capability of an (L, B, e) block code; also 2.718 282 f CAF Channel access ... frequency channels) in GSM MAI Multiple Access Interference MAIO Mobile Allocation Index Offset (for frequency hopping in GSM) MBS Mobile Broadband System MCS-1 Modulation and Coding Scheme 1 (for...

Ngày tải lên: 02/03/2013, 16:59

... extremely large in the case of unconstrained channel access, resulting in a low inherent statistical multiplexing gain. By combining CDMA with PRMA, it is possible to control the access of users ... Uplink Packet Access I I In- phase I-Slot Information Slot IEEE Institute of Electrical and Electronics Engineers IETF Internet Engineering Task Force IGA Improved Gaussian Approximation i.i.d. independent ... numbers 1 INTRODUCTION This book focuses on issues related to multiple access for cellular mobile communications, with a specific interest in access arbitration through multiple access protocols...

Ngày tải lên: 27/06/2014, 15:20

... “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 ... fair and efficient wireless access in challenging interference scenarios, for example, multiple networks deployed in the same geographical area and sharing a common band. In 1976, an ALOHA ... algorithm increases only linearly with the number of users. In this algorithm, the different CFOs from different users destroy the orthogonality among training sequences and introduce multiple access...

Ngày tải lên: 21/06/2014, 17:20

... 3) source sink

Ngày tải lên: 28/04/2014, 13:40

... 3. 0 0.2 0.4 0.6 0 0.2 0.4 0.6 0 0.2 0.4 0.6 Loadingonlink1 Loading o nl ink 2 Loading on link 3 (a) F 1 , boundary of stability region with link 1 in nitely backlogged 0 0.2 0.4 0.6 0 0.2 0.4 0.6 0 0.2 0.4 0.6 Loading on lin k1 Loading ... link 2 Loading on link 3 (b) F 2 , boundary of stability region with link 2 in nitely backlogged 0 0.2 0.4 0.6 0 0.2 0.4 0.6 0 0.2 0.4 0.6 Loading on link 1 L oading o nlin k 2 Loading on link ... 1 Loading on link 1 Loading on link 2 Partial interference Binary interference Stability region of slotted ALOHA (a) p 1 = p 2 = 0.2 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 Loading on link 1 Loading...

Ngày tải lên: 21/06/2014, 11:20

... session termination Sends leave message JoinAck JoinReq JoinReq JoinAck Join Reply Join Request Receiver Node Y Join Reply Join Request Downstream node detects a link failure sends JoinReq JoinAck Join ... broadcast joining tables to create and maintain the forwarding group FG. The joining table has the same 2 EURASIP Journal on Wireless Communications and Networking factors. In addition, multicasting ... network. These protocols require each node to maintain one or more table(s) to store routing information. In order to maintain a consistent network view, updates to the routing information tables...

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 27/06/2014, 00:20

... discussed, inserting training symbols is a heuristic way to improve the performance. It is shown in the 25 Decentralized estimation over orthogonal multiple- access fading channels in wireless ... communication SNR levels. It is interesting to see that using more training symbols does not improve the performance of the MLE as expected, because inserting training symbols will reduce the energy ... ts in [19], in di 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...

Ngày tải lên: 18/06/2014, 22:20

... communication SNR levels. It is interesting to see that using more training symbols does not improve the performance of the MLE as expected, because inserting training symbols will reduce the energy ... first inequality in (76) and t he second inequality in (77) are satisfied. From the condition f(θ)(θ − Φ) < 0, it is not hard to find that the second inequality in (76) and the first inequality in ... Furthermore, since the estimation quality of the first stage is available, we use BLUE to obtain ˆ θ for exploiting the quality information instead of using the MLE in the M-step as in the standard...

Ngày tải lên: 20/06/2014, 04:20

... 1-58053-727-8 10 9 8 7 6 5 4 3 2 1 TEAM LinG 30 Advances in Mobile Radio Access Networks increase the efficiency of power amplifiers while maintaining linearity. Since the efficiency of the state-of-the-art ... Figure 2.6 PA Consulting’s software radio-based WCDMA base station. TEAM LinG Advances in Mobile Radio Access Networks TEAM LinG TEAM LinG 62 Advances in Mobile Radio Access Networks ... UE-based solution maintains a fully functional GPS receiver in the terminal. This requires the same functionality as described in terminal- assisted GPS, plus additional means for computing the position...

Ngày tải lên: 18/04/2014, 10:43

... I A L Open Access Localization in mobile wireless and sensor networks Monica Nicoli 1* , Sinan Gezici 2 , Zafer Sahinoglu 3 and Henk Wymeersch 4 Accurate localization or tracking of wireless de ... a very large database of RSS fingerprints. Machine learning techniques are employed to extract the location information from online RSS measurements showing promising performance for room-level ... reproduction in any medium, provided the original work is properly cited. al. propose a channel parameter estimator for joint com- munications and positioning systems, using soft infor- mation concerning...

Ngày tải lên: 20/06/2014, 21:20

... 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 over- head ... and Kumar in their seminal work regarding capacity in wireless networks, [26], or other researchers [27]. In more detail, under the original TSMA policy proposed by Chlamtac and Farago in [14], ... scheduling schemes: scaling laws and capacity/delay tradeoffs,” in Proceedings of the 4th Interna- tional Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt...

Ngày tải lên: 22/06/2014, 19:20

... the protocols herein are certainly designed with mobile nodes in mind. We introduce two key concepts— the minimum connected dominating set and six families of broadcast protocols before discussing ... environments. Our three classes of adaptive protocols are pure machine learning, intra-protocol learning, and inter-protocol learning. In the pure machine learning approach, we exhibit a new approach ... techniques can be incorporated natural ly into broadcasting, and we use these ideas to create three new classes of broadcasting protocols: pure machine learn- ing, intra-protocol learning, and inter-protocol...

Ngày tải lên: 22/06/2014, 22:20

... spent in the sensing state. In fac t, in our protocol, the time during which sensors are in a sens- ing state is high, so if in this state they spend the same en- ergy as in the receiving state ... ns- mitting to the sink. If these nodes succeeded in computing the loss between them and the sink, by extracting the infor- mation from the start packet regarding its transmit power and measuring ... for me- dia access in sensor networks,” in Proc. ACM/IEEE Inter n a- tional Conference on Mobile Computing and Networking (Mo- biCom ’01), pp. 221–235, Rome, Italy, July 2001. [8] S. Lindsey, C....

Ngày tải lên: 23/06/2014, 00:20

... M.S. degrees in electr ical engineering from Ts- inghua University, Beijing, China, in 1996 and 1998, respectively, and the Ph.D. de- gree in elect rical engineering from Prince- ton University, Princeton, ... multiuser scheduling for a system described in Section 2 is that, under pure Rayleigh fading, multiuser scheduling has a vanishing relative schedul- ing gain as m and N increases (indicating a tradeoff ... shadowing , ρ = 0dB Scheduling, shadowing, ρ =−10 dB Round-robin, shadowing, ρ =−10 dB Round-robin, no shadowing , ρ =−10 dB Figure 7: Throughput comparison: multiuser scheduling versus round-robin...

Ngày tải lên: 23/06/2014, 00:20

... Lab. CCU Wireless Access Tech. Lab. Introduction (2) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab.  Gaussian noise Spread Spectrum Multiple Access (14) Wireless Access Tech. ... advantage in that they avoid the near-far effect. Spread Spectrum Multiple Access (16) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab. Spread Spectrum Multiple Access (11) Wireless Access ... Spectrum Multiple Access (8) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab. Spread Spectrum Multiple Access (6)  Frequency Hopping Spread Spectrum (FHSS) Wireless Access Tech....

Ngày tải lên: 11/07/2014, 21:20

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21