wireless multiple access telecommunication materials

... optimal and suboptimal decentralized estimators in wireless sensor networks over orthogonal multipleaccess fading channels in this paper Considering multiple- bit quantization for digital transmission, ... the original work is properly cited Decentralized estimation over orthogonal multipleaccess fading channels in wireless sensor networks— optimal and suboptimal estimators Xin Wang∗1 and Chenyang ... versions will be made available soon Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks optimal and suboptimal estimators EURASIP Journal on

Ngày tải lên: 20/06/2014, 04:20

... “Simulation of an energy efficient carrier sensing multiple access protocol for clustered wireless sensor networks,” in Proc International Workshop on Wireless Ad-Hoc Networks (IWWAN ’04), Oulu, Finland, ... Journal on Wireless Communications and Networking 2005:5, 672–685 c 2005 Chiara Buratti et al Cross-Layer Design of an Energy-Efficient Cluster Formation Algorithm with Carrier-Sensing Multiple Access ... Science and Telecommunication Systems of the National Research Council (CSITE-CNR), University of Bologna, studying telecommunications Since November 2001, he has been a Full Professor of telecommunications

Ngày tải lên: 23/06/2014, 00:20

... EURASIP Journal on Wireless Communications and Networking 2005:4, 541–553 c 2005 W Li and H Dai Optimal Throughput and Energy Efficiency for Wireless Sensor Networks: Multiple Access and Multipacket ... the receive antenna array thus form a virtual multiple- input -multiple- output (MIMO) system, which can also be viewed as a space-division -multiple- access (SDMA) system Note that due to the analogy ... result in failure), the throughput of the multiple access network is limited: the maximum throughput per slot is for time-division -multiple- access (TDMA), and is only 1/e for slotted-ALOHA with

Ngày tải lên: 23/06/2014, 00:20

... bidirectional communication CCU Wireless Access Tech Lab Wireless Access Tech Lab Introduction (4) CCU Wireless Access Tech Lab Wireless Access Tech Lab Frequency Division Multiple Access (FDMA) (1) Each ... CCU Wireless Access Tech Lab Wireless Access Tech Lab Frequency Division Multiple Access (FDMA) (2) Allocation of separate channels to FDMA signals CCU Wireless Access Tech Lab Wireless Access ... received without interference from another CCU Wireless Access Tech Lab Wireless Access Tech Lab Introduction (2) CCU Wireless Access Tech Lab Wireless Access Tech Lab Introduction (3) In conventional

Ngày tải lên: 11/07/2014, 21:20

... Sliding window ► Go-back-N Multiple Access Techniques     Frequency Division Multiple Access (FDMA) Time Division Multiple Access (TDMA) Random Access Code Division Multiple Access (CDMA)  User ... Wireless Networks Lecture Multiple Access Techniques Dr Ghalib A Shah Outlines      Review of previous lecture #5 FDMA TDMA CDMA Random Access ► ALOHA ► Slotted ... in contrast to fixed -access schemes, each user gains access to medium only when needed -has some data to send • drawback: users must compete to access the medium (‘random access? ??) • collision

Ngày tải lên: 05/07/2022, 13:06

... Wireless Communications and Networking Volume 2011, Article ID 825327, 12 pages doi:10.1155/2011/825327 Research Article Iterative Fusion of Distributed Decisions over the Gaussian Multiple- Access ... shelf-labeling wireless sensor network,” Eurasip Journal on Wireless Communications and Networking, vol 2010, Article ID 343690, 12 pages, 2010 W K G Seah, A E Zhi, and H P Tan, ? ?Wireless sensor ... decision fusion in wireless sensor networks,” IEEE Transactions on Signal Processing, vol 52, no 12, pp 3454– 3458, 2004 Y Lin, B Chen, and L Tong, “Distributed detection over multiple access channels,”

Ngày tải lên: 21/06/2014, 07:20

... regarding the traffic on the stability performance of Gaussian multipleaccess channels We will focus our attention on a slotted Gaussian multiple- access channel with K users sending bursty data to a single ... Y K XK Noise, Z Figure 1: Gaussian multiple- access channel with random arrivals PROBLEM FORMULATION 2.1 Channel and source model We consider a multiple- access system, as the illustrated in ... Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008, Article ID 695894, 11 pages doi:10.1155/2008/695894 Research Article Slotted Gaussian Multiple Access Channel: Stable

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 ... by 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 ... and reproduction in any medium, provided the original work is properly cited INTRODUCTION In multiple access relay (MAR) systems, several source nodes send independent messages to a destination

Ngày tải lên: 22/06/2014, 01:20

... Spread-spectrum multiple access is a popular technique al- lowing several users to share the same bandwidth at the same time. Spread spec trum is often equated with direct-sequence code-division multiple access ... interleave-division multiple access a potential air interface for 4G bearer services and wireless LANs,” in Proceedings of the 1st IFIP International Conference on Wireless and Optical ... spread-spectrum multiple- access channels,” IEEE Journal on Selected Areas in Communications, vol 8, no 4, pp 641–649, 1990 [7] P A Hoeher and H Schoeneich, Interleave-division multiple access

Ngày tải lên: 22/06/2014, 23:20

... maximize the sum capacity of a time invariant Gaussian MIMO multiple- access channel. The ergodic capacity region for MIMO multiple- access channel with covariance feedback has been studied in ... space-division- multiple- access schemes,” IEEE Transactions on Information Theory, vol 44, no 4, pp 1468– 1476, 1998 [12] W Yu, W Rhee, and J Cioffi, “Optimal power control in multiple access fading ... from single-user case. They are easily extended to cases with multiple users. The outage capacity issue for single-user multiple- input multiple- output (MIMO) case was studied extensively. In [1],

Ngày tải lên: 23/06/2014, 01:20

... slightly modified the MACA protocol and proposed a new multiple access protocol termed MACAW (Multiple Access Collision Avoidance Protocol for Wireless LANs) [11]. This protocol proposed the addition ... Code Division Multiple Access In the previous chapter, we reviewed the basic concepts of multiuser communications and the multiple access techniques used to allow multiple users to... ... September 28, 2006 15:54 16 CODE DIVISION MULTIPLE ACCESS (CDMA) 1.2.1 ALOHA The most common contention-based methods are random access methods. The first random access method was developed by Abramson

Ngày tải lên: 07/08/2014, 21:20

... 15:54 30 CODE DIVISION MULTIPLE ACCESS (CDMA) FIGURE 2.4: Comparison of original/despread signal and spread signal spectra for DS/SS with square pulses. 2.2.2 Multiple Access The DS/SS technique ... 15:54 SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 45 structure described is optimal only in the absence of multiple access interference Time hopping can be thought of ... 2006 15:54 SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 41 If we choose the frequency spacing to be an integer multiple of the hop rate for illustration purposes, we sample

Ngày tải lên: 07/08/2014, 21:20

... CODE DIVISION MULTIPLE ACCESS (CDMA) 3.1.4 Statistical Multiplexing The final fundamental CDMA concept that we will discuss in this section is termed statistical multiplexing, which ... of a wireless link can be viewed in terms of either its average BER value or P1: IML/FFX P2: IML MOBK023-03 MOBK023-Buehrer.cls September 28, 2006 15:55 CELLULAR CODE DIVISION MULTIPLE ACCESS ... CELLULAR CODE DIVISION MULTIPLE ACCESS In this section, we will discuss four key principles of CDMA systems, particularly cellular systems: interference averaging, statistical multiplexing, universal

Ngày tải lên: 07/08/2014, 21:20

... occurs at 1 p < K which is a general... are termed the multiple access collision avoidance/common-transmitter (MACA/C-T) and the multiple access collision avoidance/receiver-transmitter (MACA/R-T) ... be assigned dynamically for multiple access based on... IML/FFX MOBK023-04 P2: IML MOBK023-Buehrer.cls 118 September 28, 2006 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) indicator ... Slotted ALOHA, CSMA, and busy tone multiple access (BTMA) [43] Note... MOBK023-Buehrer.cls 120 September 28, 2006 15:55 CODE DIVISION MULTIPLE ACCESS (CDMA) Solution: The two

Ngày tải lên: 07/08/2014, 21:20

... P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 148 CODE DIVISION MULTIPLE ACCESS (CDMA) r ( t ) Matched filter User 1 Σ + Σ + Σ + b b b b 1 b 2 b K Matched ... followed by multiple stages of parallel interference cancellation [113]. This would improve the initial estimates allowing for fewer stages to obtain a specific level of performance. Multiple stages ... P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 150 CODE DIVISION MULTIPLE ACCESS (CDMA) Mathematically, we can represent the bit decisions for an S-stage parallel cancellation

Ngày tải lên: 07/08/2014, 21:20

... DIVISION MULTIPLE ACCESS (CDMA) [14] F A Tobagi and L Kleinrock, “Packet switching in radio channels: Part III—Polling and (dynamic) split-channel reservation multiple access, ” IEEE ... C Wu and V O K Li, “Receiver-initiated busy-tone multiple access in packet radio networks,”... synchronous code- division multiple- access channel,” IEEE Transactions on Communications, ... Data Communications, pp 39–49, 1997 [17] Z J Haas and J Deng, “Dual busy tone multiple access (DBTMA)—a multiple access control scheme for ad hoc networks,” IEEE Transactions on Communications,

Ngày tải lên: 07/08/2014, 21:20

... parts 2 Wireless medium access example Wireless medium access (1) Station A Contention Window ACK Defer Station B Backoff... (backoff time expires first) and starts sending packet 2 Wireless ... packet 2 Wireless medium access example Wireless medium access (3) 5) Station D starts sending packet Now there is no competition Station A Station B ACK Station C 5 Station D DIFS DIFS 2 Wireless ... DIFS DIFS 4) However, station B is ”winner” and starts sending packet 2 Wireless medium access example Wireless medium access (3) 5) Station D starts sending packet Now there is no competition...

Ngày tải lên: 06/10/2014, 21:38

... generation (4G) wireless landscape - Both LTE and WiMAX standards use several common technologies with subtle differences.The main common technology is orthogonal frequency-division multiple access (OFDMA) ... Orthogonal Frequency Division Multiple Access in WiMAX and LTE: A Comparison S Srikanth and P A Murugesa Pandian, Anna University ... bandwidths, the ability to handle different data rates, and the ability to easily combine with multiple antenna techniques Nhóm - The focus of this article is on the comparative use of OFDMA

Ngày tải lên: 24/07/2015, 22:26

... hiệu suất kịch Cả LTE WiMAX có nhấn mạnh vào việc sử dụng kỹ thuật HARQ để xử lí điều kiện kênh wireless [1, 2] Sử dụng phân tập đa người dùng Trong kịch điển hình, người dùng sử dụng tần số chọn ... nghệ Tuy nhiên, tài sản mạng lưới khối lượng sản phẩm đóng vai trị quan trọng lựa chọn hệ thông wireless 4G nhà khai thác mạng Như đề cập trước đó, hầu hết nhà khai thác mạng ưu thích LTE WiMAX ... khả tương thích ngược, quy định chi phí sản phẩm có nhiều phương diện việc lựa chọn cho hệ thông wireless 4G

Ngày tải lên: 24/07/2015, 22:27

... frequency-division multiple -access (OFDMA) and combinations of OFDM with CDMA, e.g., multi-carrier code-division multiple -access (MC-CDMA), multi-carrier direct-sequence code-division multiple -access ... Wireless Packet Access Broadband wireless packet access should deliver much higher data transmission rates and provide more diverse services than current 2-3G systems All-IP wireless. ... Frequency Code VIII Division Multiplexing WBAN: Wireless Body Area Network WLAN: Wireless Local Area Network WPAN: Wireless Personal Area Network WUSB: Wireless Universal Serial Bus

Ngày tải lên: 12/09/2015, 08:18