space division multiple access techniques

... multiple- access system with multiple antennas at the base station. Most previous studies are constrained to either fixed channel condition [11, 12] or ergodic capacity region [13]. The space- division ... acampora@ece.ucsd.edu Received 30 May 2003; Revised 5 February 2004 Space- division multiple- access (SDMA) systems that employ multiple antenna elements at the base station can provide much higher ... 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...

Ngày tải lên: 23/06/2014, 01:20

... 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 ... INTRODUCTION 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 ... where he is currently work- ing as a Research Assistant. His research interests include multiple access techniques, iterative multiuser detection, turb o equalization, semiblind channel estimation,...

Ngày tải lên: 22/06/2014, 23:20

... understood orthogonal access techniques such as time division multiple access and frequency division multiple access. Additionally, random access schemes such as carrier sense multiple access are examined. In ... 64 2.8 Multiple Access Performance of Frequency-Hopped Code Division Multiple Access 67 2.9 Summary 71 3. Cellular Code Division Multiple Access 73 3.1 Principles of Cellular Code Division Multiple ... contention-free multiple access is in how the channels are defined. In time division multiple access (TDMA), channels are defined according to time slots. In frequency division multiple access (FDMA),...

Ngày tải lên: 27/06/2014, 14:20

... Frequency Division Multiple Access (FDMA) (3) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab. Spread Spectrum Multiple Access (8) Wireless Access Tech. Lab. CCU Wireless Access ... structures. Time Division Multiple Access (TDMA) (6) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab.  TDMA Frame Structure Time Division Multiple Access (TDMA) (5) Wireless Access Tech. ... transmit simultaneously. Frequency Division Multiple Access (FDMA) (1) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab. Time Division Multiple Access (TDMA) (4)  Features of TDMA...

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Ngày tải lên: 07/08/2014, 21:20

... Baey, Fladenmuller – Subject 5 MOB Subject 5 Access methods Static and dynamic access techniques 1. Static access techniques 1.1 Space- division multiple- access (SDMA) When one seeks to cover a broad ... η a  1. 1.3 Time Division Multiple Access (TDMA) In the traditional local networks, a physical support is sharing between several users. It is thus important to define the access rules of the ... solutions are simple to introduce, but suffer from a very low yield. You lose the multiplexing gain! 3. Dynamic access techniques Pure Aloha: the principle of Aloha is to let talk to everyone when...

Ngày tải lên: 17/09/2012, 09:13

... 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 ... 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 ... 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...

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...

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 ... coding) and the 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 ... transmission. THEORY OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION 1 INTRODUCTION TO CELLULAR MOBILE RADIO COMMUNICATION The subject of this book is code division multiple access (CDMA) communi- cations....

Ngày tải lên: 01/06/2014, 11:27