define what a distributed antenna system das

... scattering co-located antennas in an analytical way. Though there are different ways to scatter antennas and different antenna lay- outs may result in different performances, investigating all possible layouts ... isolated area offers significant power gain and capacity gain over CAS. However, in a multicell environment, as antennas are dis- Jiansong Gan et al. 3 which all users are guaranteed to arrive at ... sum rate. The channel capacity of a single-user DAS and the sum rate of a multi-user DAS were investigated and compared with those of co-located antenna systems (CAS) using Monte Carlo simulation...

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 23/06/2014, 01:20

Ngày tải lên: 24/08/2014, 10:54

Ngày tải lên: 07/12/2013, 11:41

... Stonebraker 1 Introduction The Mariposa distributed database system addresses a fun- damental problem in the standard approach to distributed data management. We argue that the underlying assumptions traditionally ... the actual metadata to see if it has changed. The quality of service is then a measurement of the metadata’s rate of update, as well as the name server’s rate of update. 6 Mariposa status and ... execution plans that can adapt to the environment (such as unbalanced workload and poor data placement) in a flexible manner. We are implementing more sophisticated features and plan a general release...

Ngày tải lên: 23/03/2014, 12:20

... City and Santa image sets shows a clearer advantage of our method than that for the Meeting room image set, because the former image sets are suitable for generating accurate side information. Although ... Therefore, if the cameras have a function that maps pixel values to coset indices and encodes them with an intraimage coder (e.g., the Axis 210 camera we used for the camera array has a built-in JPEG ... 245–248, Atlanta, Ga, USA, October 2006. [21] R. Tsai, A versatile camera calibration technique for high- accuracy 3D machine vision metrology using off-the-shelf TV cameras and lenses,” IEEE Journal...

Ngày tải lên: 22/06/2014, 00:20

... also used as a means to harness diversity from the spatial domain [1, 2, 3]. Generally, the AA system consists of spa- tially distributed antennas and a beamformer which gener- ates a weight vector ... this paper, we consider that the array geom- etry, which is the parameter of the antenna aperture gain, is a uniform linear array (ULA) of M identical sensors. All sig- nals from MS arrive at the ... interest. Finally, the last term is AWGN. 3. PERFORMANCE ANALYSIS OF A CDMA SYSTEM WITH AA IN DISPERSIVE MULTIPATH RICIAN FADING CHANNELS 3.1. Reverse-link asynchronous transmission scenario To analyze...

Ngày tải lên: 23/06/2014, 00:20

... system capacity is the use of spa- tial processing with an antenna array (AA) at base station (BS) [1, 2, 3, 4, 5, 6]. Generally, the AA system consists of spatially distributed antennas and a beamformer ... this paper, we consider that the array geometry, which is the parameter of the antenna aperture gain, is a uni- form linear array (ULA) of M identical sensors in Figure 1. All signals from MS arrive ... trade-offs encountered among parameters such as the number of receiving antennas and PCE. The paper is orga- nized as follows. In Section 2, channel and system models are described. The AA system...

Ngày tải lên: 23/06/2014, 01:20

... blocks that a user may allocate. A separate quota can be set for each user on each file system. Resources are given both a hard and a soft limit. When a program exceeds a soft limit, a warn- ing ... data, and possibly a single fragmented block. If a file system block must be fragmented to obtain space for a small amount of data, the remaining fragments of the block are made available for allocation ... fragment at a a time is that data may be copied many times as a fragmented block expands to a full block. Fragment reallocation can be minimized if the user program writes a full block at a time,...

Ngày tải lên: 12/09/2012, 14:16

... in nature to a data manager which fails to free data, but is easier to detect and prevent. ã Data manager changes data. A malicious data manager may change the value of its data on each cache refresh. ... modify a page of data at a time. An attempt by a reader to write previously read data causes a memory fault which converts a reader into a writer and invalidates all other page caches. A subsequent ... servers than its kernel. 8 When a user task requires greater access to cached data than the data manager has permitted (e.g., a write fault on a page made read-only by a pager_data_lock call), the...

Ngày tải lên: 12/09/2012, 15:05

... contains all logic data of application. Separating logic data from application into it will make program scalable and higher performance. Most of web applications today use Relational Database Management ... operating system. - Easy to manage, update database: Database is located at dedicated server that managers can maintain and update it easily. - Quick delivery: web-based model make it portable to ... load data from the system because only a part of web page is updated. It does not need to load entire web page. - Access management: each user can access content and use many features that are...

Ngày tải lên: 27/10/2012, 16:40

... too And I think to myself… I hear babies cryin', The bright blessed day, t@o What a wonderful world what a wonderful world. I see trees of green, and clouds of white I see skies ... sayin' "How do you do?" Are also on the faces so pretty in the sky The colors of the rainbow, I watch them grow the dark sacred night red roses too And I think ... white I see skies of blue of people going by They're really saying "I love you” Yes, I think to myself I see them bloom, for me and you ...

Ngày tải lên: 03/06/2013, 01:25

Ngày tải lên: 05/09/2013, 09:08

Ngày tải lên: 05/09/2013, 09:08

Ngày tải lên: 05/09/2013, 09:38

Ngày tải lên: 05/09/2013, 10:15

Ngày tải lên: 15/10/2013, 17:42

... components and metacontent in one place makes them easier to maintain, track, and find. It also provides a more secure way of storing your data. Having your data localized means you have a smaller area ... personal preferences and navigational habits. Personalization is a major reason why many people return to a Web site. At one time, seeing her name on a Web page was all that was needed for a user ... having added value. Adding something that users don't see as having value is a waste of resources. What this all boils down to is that all sites can use some personalization. What each site...

Ngày tải lên: 10/12/2013, 14:15

... DATA vi 2 Target tr v 2 th mc chia s DATA1 và DATA2 trên 2 máy khác nhau là SERVER01 và SERVER02. Kt hp tính nng Replication trong Active Directory đ đng b 2 Target c a Link DATA ... Liên kt DATA đã đc to ra vi 2 Target v 2 th mc chia s trên 2 máy tính khác nhau. Click chut phi liên kt DATA chn Check Status đ kim tra trng thái 2 Target. MaIT Education http://www.MaIT.vn ... ch đnh Target cho liên kt DATA å OK 3. Ch đnh Target là th mc chia s DATA1 trên máy SERVER01 å OK MaIT Education http://www.MaIT.vn MaIT Education http://www.MaIT.vn ...

Ngày tải lên: 17/12/2013, 04:15

Ngày tải lên: 17/12/2013, 20:53