code division multiple access techniques in optical fiber networks
Code Division Multiple Access CDMA pdf
... 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 ... time division multiple access and frequency division multiple access. Additionally, random access schemes such as carrier sense multiple access are examined. In Chapter 2, basic spread spectrum techniques ... Spectrum Techniques for 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...
Ngày tải lên: 27/06/2014, 14:20
Luận văn kỹ thuật cdma (code division multiple access) luận văn, đồ án, đề tài tốt nghiệp
Ngày tải lên: 25/07/2014, 09:39
Code Division Multiple Access (CDMA) phần 1 doc
... Conflict-Free Medium Access Control 2 1.1.1 Time Division Multiple Access 3 1.1.2 Frequency Division Multiple Access 5 1.1.3 Code Division Multiple Access 6 1.1.4 Traffic Engineering and Trunking Efficiency ... 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 ... Summary 22 2. Spread Spectrum Techniques for Code Division Multiple Access 23 2.1 Forms of Code Division Multiple Access 23 2.2 Direct Sequence Code Division Multiple Access 24 2.2.1 Power Spectral...
Ngày tải lên: 07/08/2014, 21:20
BÀI BÁO CÁO -Công nghệ WCDMA(wideband code division multiple access) và tình trạng triển khai
Ngày tải lên: 02/06/2015, 17:26
theory of code division muitiple access communication
... designed by using digital modulation techniques at the transmitter (including both source coding and channel error-correcting coding) and the corresponding signal pro- cessing techniques at the ... resistance to signal interference from multiple trans- mission paths and potentially higher bandwidth efficiency in multiple access communication than in other technologies. In the beginning of this chapter ... 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 in a conventional mobile...
Ngày tải lên: 01/06/2014, 11:27
báo cáo hóa học:" Multiple access communications in future-generation wireless networks" potx
... article “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 ... 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 channel ... carrier frequency offset (CFO) estimation in the uplink of multiuser multiple- input multiple- output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Conventional maximum likelihood...
Ngày tải lên: 21/06/2014, 17:20
Báo cáo hóa học: " Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems Hendrik Schoeneich and Peter Adam Hoeher" docx
... H. Mahadevappa and J. G. Proakis, “Mitigating multiple access interference and intersymbol interference in uncoded CDMA systems with chip-level interleaving,” IEEE Transac- tions on Wireless Communications, ... estimation schemes suitable for interleave -division multiple access (IDMA) systems are presented. Training and data are superimposed. Training-based and semiblind linear channel estimators are derived ... “Adaptive interleave -division multiple access a potential air interface for 4G bearer ser- vices and wireless LANs,” in Proceedings of the 1st IFIP Inter- national Conference on Wireless and Optical...
Ngày tải lên: 22/06/2014, 23:20
Báo cáo hóa học: " Bounds on the Outage-Constrained Capacity Region of Space-Division Multiple-Access Radio Systems" docx
... region should increase linearly in each dimension as ρ increases lin- early in dB. As a result, we would also expect the outage ca- pacity region to increase linearly in each dimension as ρ in- creases. ... Signal Processing 2004:9, 1288–1298 c 2004 Hindawi Publishing Corporation Bounds on the Outage-Constrained Capacity Region of Space -Division Multiple- Access Radio Systems Haipeng Jin Center for ... prevents us from obtaining closed-form expressions for multiple- mobile cases similar to those shown in (A.2)and (35). 4. NUMERICAL RESULTS The bounding techniques introduced in the previous section will...
Ngày tải lên: 23/06/2014, 01:20
Multiple Access Techniques for Wireless Communications ppsx
... large bandwidth. This spreading occurs by combining the transmitter signal with a spreading sequence. Code Division Multiple Access (CDMA) (1) Multiple Access Techniques for Wireless Communications 2005/07/06 Weng ... Wireless Access Tech. Lab. Packet Radio (1) In packet radio (PR) access techniques, many subscribers attempt to access a single channel in an uncoordinated (or minimally coordinated manner. Collision ... user. Code Division Multiple Access (CDMA) (4) Wireless Access Tech. Lab. CCU Wireless Access Tech. Lab. Packet Radio Protocols , vulnerable period is defined as the time interval during...
Ngày tải lên: 11/07/2014, 21:20
Báo cáo hóa học: " Research Article An Adaptive Time-Spread Multiple-Access Policy for Wireless Sensor Networks" pot
... 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], ... system throughput is required in a small number of frames since the beginning of the network operation). This interesting case is demonstrated using simulation results in the sequel. 4.1. Simulation ... data are forwarded towards a cer tain destination in the network (the sink node), while in ad hoc networks the destination of the data can be any node. Depending on the particular ad hoc and sensor...
Ngày tải lên: 22/06/2014, 19:20
Routing and Wavelength Assignment in Optical WDM Networks ppt
... mainly point-to-point traffic, another attractive feature of light-trees is the inherent capability for performing multicasting in the optical domain (as opposed to performing multicasting at a higher ... the increased complexity of the problem and yet produce good solutions. In the following we summarize the recent work on multicasting in optical networks, but the reader should keep in mind that ... multicasting in wavelength routed optical networks were first demonstrated in [24]. Specifically, it was shown that using light-trees (spanning the source and destination nodes) rather than individual...
Ngày tải lên: 06/08/2014, 00:21