ds ss and cdma receivers for wireless mobile communications

... Soh Yu Ming and Mr Chong Lee Kee A special thanks to Associate Professor Ooi Wei Tsang and Associate Professor Roger Zimmerman for their productive comments for my thesis proposal and research ... TECHNIQUES FOR WIRELESS MOBILE CLIENTS BHOJAN ANAND (Ph.D.), NATIONAL UNIVERSITY OF SINGAPORE Directed by: Professor Dr A.L Ananda In this thesis we present a suite of algorithms and techniques for ... Internet Research Lab for making the supportive work environment My deepest gratitude goes to my wife Florence Anand and sons Mikhil Anand and Sashil Anand for their unflagging love and support throughout...

Ngày tải lên: 08/09/2015, 21:57

... for videos and mobilegames? We have used fevicon (or corporate logo or key image) based colour transformation to retain the brand colours and identity of the pages Our colour transformation for ... modern mobile devices Brand colour and HVS based colour transformation of web pages (texts and images) for energy efficient browsing in OLED displays including a description on how these color transformation ... display and 3G mobile network interface consumes 45 to 50% and 35 to 40% of the total system power respectively The remaining power is consumed by the CPU and memory subsystems [1] 3G   Wireless  ...

Ngày tải lên: 08/09/2015, 21:57

... wireless net standpoint, in transmission periods, i.e., on-periods, and nontransmission periods, i.e., off-periods During on-periods the proxy transmits frames to the mobile host at the highest possible ... decrease in wireless network capacity due to unnecessary retransmissions, and unfairness The authors have proposed Network-Assisted Power Management (NAPman) that leverages AP virtualization and a ... demands, and obtains the demand distribution via online profiling and estimation Yuan and Nahrstedt [91] have designed and implemented Practical Voltage Scaling (PDVS) algorithm which extends...

Ngày tải lên: 08/09/2015, 21:58

... backlight) In Android phones, we directly write the required brightness level of the backlight to the kernel maintained file (/sys/class/leds/lcd-backlight/brightness) for current system brightness as ... Static-aggr (for all maps) were significant (at 5%) against the Default values For Dynamic-aggr, all values for maps and (light map and light/dark map) were significant at 5% Q4 and Q5 for map (dark ... doing pixel-by-pixel transformations for every frame is compu- 68 tationally expensive on mobile devices and could result in less energy savings (due to high CPU costs) and lower frame rates [36]...

Ngày tải lên: 08/09/2015, 21:59

... consuming colours for background The second half, e[mf ] is a set of relatively high power consuming colours for foreground Then, for each possible combination of background and foreground colours ... contrast (brightness contrast) are 200-250 and 175-220 for original and modified pages respectively W3C recommended values for minimum chromatic and a chromatic contrast are 500 145 and 125 respectively ... which is gathered in processes such as, compression/conversion and edge smoothing process Moreover these colours not contribute for colour harmonisation Algorithm: Brand Colour Extraction Input:Image...

Ngày tải lên: 08/09/2015, 22:02

... Figure 4.28 Normalised performance count is a ratio between total number of times an image appeared in the pair for selection and number of times it is selected as the best For high power saving, ... selected as the best For high power saving, PM based approach outperforms other approaches and for low power saving, HVS based approach performs better This may be due to the capability of HVS approach ... text/background colour transformation approach should be combined with power-model based image transformation approach to save 150 60% (and above) power while providing best possible quality With this...

Ngày tải lên: 08/09/2015, 22:05

... when and for how long to sleep a player’s network interface Consider two players ’1’ and ’2’ at grids x1 and x2 respectively In t time steps, let the grids reachable for players and be L1 and ... time step weighted grids Figure 5.10 shows an example of a possible weighted grids for three times steps and for a player moving forward 174 5.3.2 Determining Sleep Times and Intervals We now ... bus and provided leads for current measurements The measurements for wireless interface was done in both Quake III and Ryzom games Table 5.4 Power characteristic of the card used Mode Standby...

Ngày tải lên: 08/09/2015, 22:08

... Conserving Wireless Network Energy Wireless network interface is another high power consuming component in a smartphone In Chapter we have discussed the design and development of three algorithms for ... and other parameters required for backlight scaling These include the relationships between “γ and contrast”, “γ and backlight level” and “contrast and brightness” We have derived these relationships ... (game worlds) in modern 3D games, HDR tone mapping techniques and response of HVS to colour and brightness Based on these analysis, we have developed and evaluated a set of algorithms for conserving...

Ngày tải lên: 08/09/2015, 22:08

... Committee, “IEEE standard for wireless LAN,” http://standards.ieee.org/ about/get/, Nov 1997 [63] R Krashinsky and H Balakrishnan, “Minimizing energy for wireless web access with bounded slowdown,” ... Z Anderson, and S Seshan, “Choosing beacon periods to improve response times for wireless HTTP clients,” in Proceedings of the second international workshop on Mobility management & wireless ... Performance, Computing, and Communications, 2004 IEEE International Conference on, 2004, pp 695 – 700 [68] S H Y Wong, H Yang, S Lu, and V Bharghavan, “Robust rate adaptation for 802.11 wireless...

Ngày tải lên: 08/09/2015, 22:09

... VW Chook, S Chessa, A Gotta, YF Hu, Wireless sensor networks: a survey on the state of the art and the 802.15.4 and zigbee Du et al EURASIP Journal on Wireless Communications and Networking 2011, ... design and simulation environment for wireless sensor networks EURASIP Journal on Wireless Communications and Networking 2011 2011:143 Page 20 of 20 Submit your manuscript to a journal and benefit ... requirements Part 15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (WPANs), (Institute of Electrical and Electronics Engineers,...

Ngày tải lên: 20/06/2014, 22:20

... control and resource management for a multimedia CDMA wireless system,” in Proceedings of 6th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wireless: Merging ... provide high-capacity flexible services REFERENCES [1] H Holma and A Toskala, Eds., WCDMA for UMTS-Radio Access for Third Generation Mobile Communications, John Wiley & Sons, New York, NY, USA, 2000 ... model just proposed for a multirate and multicode DS- CDMA system follows the structural principles of practical downlink UMTS and leads to a convenient algebraic form which allows for a powerful receiver...

Ngày tải lên: 22/06/2014, 22:20

... practice Overall, in this dissertation, we design and implement efficient large data dissemination and collection protocols for wireless sensor networks, which outperform state-of-the-art protocols ... Interference for Wireless Sensor Networks,” Under Submission (2) Manjunath Doddavenkatappa, Mun Choon Chan, and Ben Leong, “Splash: Fast Data Dissemination with Constructive Interference in Wireless Sensor ... Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM), April 2011 Chapter Introduction 1.1 Wireless Sensor Networks Wireless networks of...

Ngày tải lên: 10/09/2015, 09:10

... white Gaussian channel, and their averages over general fading The tightness of the bounds is demonstrated For average performance of differential and noncoherent receivers, by expressing the ... receivers and differential/noncoherent receivers, we look into the performance of coherent receivers and differential/noncoherent receivers separately For coherent receivers, the IBEP and ISEP usually ... Error Performance of Quadratic Receivers 95 5.1 New Expression for Performance of Quadratic Receivers 98 5.1.1 Independent R0 and R1 99 5.1.2 Correlated R0 and R1 ...

Ngày tải lên: 10/09/2015, 15:51

... (DSSS) radio interface [24] operating at 914MHz frequency with 2Mbps in bandwidth The link layer of ns-2 for wireless environments implements the complete IEEE802.11 standard [25] Medium Access ... Distributed Coordination Function DSDV Destination-Sequenced Distance-Vector Routing DSDV-SQ DSDV with Sequence Number for update trigger DSR Dynamic Source Routing DSSS Direct-Sequence Spread Spectrum ... PDR Performance of AODV-RR and AODV 79 Figure 3.21 PDR Performance of AODV-RR and AODV 79 Figure 3.22 Overhead Performance of AODV-RR and AODV 81 Figure 3.23 Overhead Performance of AODV-RR and...

Ngày tải lên: 26/09/2015, 09:48

... kinds: (i) the conventional hearing aids and (ii) wireless hearing aids Wireless hearing aids using wireless technology are under investigations [1] From the circuit operation and signal processing ... Typical wireless hearing aids system construction Some characteristics of a wireless hearing aid, compared to the conventional hearing aids, as discussed below: (1) Wireless hearing aids primarily ... implemented in a DSP chip Considering recent evolutions, the wireless hearing aids having multi-microphones, analog, digital and mixed signals and radio frequency signals processing circuits, DSP and programmable...

Ngày tải lên: 10/11/2015, 11:28

... for Mobile Communications Networks, Hamed Al-Raweshidy and Shozo Komaki, editors Simulation and Software Radio for Mobile Communications, Hiroshi Harada and Ramjee Prasad TDD -CDMA for Wireless ... Universal Wireless Personal Communications, Ramjee Prasad WCDMA: Towards IP Mobility and Mobile Internet, Tero Ojanpera and ¨ Ramjee Prasad, editors Wideband CDMA for Third Generation Mobile Communications, ... Tero Ojanpera and Ramjee Prasad, editors ¨ Wireless IP and Building the Mobile Internet, Sudhir Dixit and Ramjee Prasad, editors WLAN Systems and Wireless IP for Next Generation Communications, ...

Ngày tải lên: 26/04/2013, 09:50

... for Mobile Communications Networks, Hamed Al-Raweshidy and Shozo Komaki, editors Simulation and Software Radio for Mobile Communications, Hiroshi Harada and Ramjee Prasad TDD -CDMA for Wireless ... Universal Wireless Personal Communications, Ramjee Prasad WCDMA: Towards IP Mobility and Mobile Internet, Tero Ojanpera and ¨ Ramjee Prasad, editors Wideband CDMA for Third Generation Mobile Communications, ... Tero Ojanpera and Ramjee Prasad, editors ¨ Wireless IP and Building the Mobile Internet, Sudhir Dixit and Ramjee Prasad, editors WLAN Systems and Wireless IP for Next Generation Communications, ...

Ngày tải lên: 20/01/2014, 23:20

... Radio Propagation and Subsystems Research for the Evolution of Mobile Communications, ’’ IEEE Comm Mag., Vol 34, No 2, February 1996, p 58 [2] Prasad, R., Universal Wireless Personal Communications, ... Bennett, and S Stein, Communication Systems and Techniques, New York: IEEE Press, 1996 [4] Jakes, Jr., C., Microwave Mobile Communications, New York: John Wiley & Sons, 1974 [5] Lee, W C Y., Mobile Communications ... [6] Steele, R., Mobile Radio Communications, New York: IEEE Press, 1992 [7] Rappaport, T S., Wireless Communications, Piscataway, NJ: Prentice Hall, 1996 [8] Proakis, J G., Digital Communications, ...

Ngày tải lên: 20/01/2014, 23:20

... the performance of unitary spacetime coding for UWB and DSSS signals The simulation parameters are set as BDSSS = MHz and Lc = 16 as in [23] We can see that UWB and DSSS systems possess the same ... Jout,DSSS (t) = NJ,DSSS = E Jout,DSSS = Tf Direct-sequence spread spectrum signals are also widely used as a secure communications technique With much larger bandwidth, UWB is expected to outperform ... 2BDSSS (37) Numerical Results RJ (t1 − t2 )p(t1 )p(t2 )dt1 dt2 fJ +BJ (36) n=0 where Pc ( f ) is the frequency response of pc (t), and BDSSS is the bandwidth of the DSSS signal Comparing (34) and...

Ngày tải lên: 21/06/2014, 22:20

... design, prototype development and base station design Handset manufactures developed new mobile handsets and switching systems Core MODEM chip for CDMA communication was successfully developed by Qualcomm ... Telecommunication Union Includes CDMA2 000 and W -CDMA Services include wide-area wireless voice telephone, video calls, and wireless data, all in mobile environments Compared to 2G and 2.5G services, 3G ... 3.6864Mcps CDMA2 000 (3GPP2) CDMA2 000 (3GPP2) Features Hybrid 2.5G/3G technology of mobile telecommunications standards that use CDMA Multiple access scheme for digital radio, to send voice, data, and...

Ngày tải lên: 27/06/2014, 13:20