optical orthogonal frequency division multiplexing for high speed wireless optical communications

... equalization and orthogonal frequency- division multiplexing (OFDM) [4]. OFDM is a promising solution for efficiently capturing multipath energy in highly dispersive UWB channels and de- livering high data ... Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006, Article ID 91329, Pages 1–12 DOI 10.1155/WCN/2006/91329 High- Speed Turbo-TCM-Coded Orthogonal Frequenc y -Division M ultiplexing ... using orthogonal frequency division multiplexing, ” IEEE Transactions on Communications, vol. 33, no. 7, pp. 665– 675, 1985. [5] A. Batra, et al., “Multi-band OFDM physical layer proposal for IEEE...

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Ngày tải lên: 11/07/2014, 20:21

Ngày tải lên: 16/10/2014, 21:48

... low-complexity MIMO symbol detector with close-Maximum a posteriori performance for the emerging multiantenna enhanced high- speed wireless communications. The VLSI implementation is based on a novel MIMO ... degrees of freedom in MIMO channels. Since the multiplexing gain is only available for high SNR region, spatial multiplexing is usually used when high SNR is available. STBC/SFBC [11] assumes ... technique for wireless communications, ” IEEE Journal on Selected Areas in Communications, vol. 16, no. 8, pp. 1451–1458, 1998. [13] M. Siti and M. P. Fitz, “A novel soft-output layered orthogonal lattice...

Ngày tải lên: 21/06/2014, 17:20

... to high- speed wireless networks. The MAC de- sign in high- speed wireless networks, such as IEEE 802.11n, 8 EURASIP Journal on Wireless Communications and Networking Table 3: Analysis results for ... Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007, Article ID 12597, 14 pages doi:10.1155/2007/12597 Research Article Towards Scalable MAC Design for High- Speed Wireless LANs Yuan ... conditions, TMAC pro- vides more transmission opportunities for high- rate stations perceiving good channels. This feature is important for high- speed wireless LANs and mesh networks to mitigate the se- vere...

Ngày tải lên: 22/06/2014, 19:20

... algorithm for high speed morpheme extraction, and also de- scribes its implementation on a specific machine. This machine, MEX.I, is designed as the first step 313 A HARDWARE ALGORITHM FOR HIGH ... be- lieve it is suitable for VLSI implementation. Ac- tually, its VLSI implementation is in progress. A high speed morpheme extraction VLSI will im- prove the performance of such text processing ... Step 2 for Procedure 1 are implemented in each state for (a), (b), (c), (d), (e), and so on. In state (a) for Fig. 4, the index memory's out- put expresses the address range for the...

Ngày tải lên: 21/02/2014, 20:20

... created noun similarity list. Acknowledgement We wish to thank USC Center for High Performance Computing and Communications (HPCC) for help- ing us use their cluster computers. References Banko, M. ... Association for Computational Linguistics Randomized Algorithms and NLP: Using Locality Sensitive Hash Function for High Speed Noun Clustering Deepak Ravichandran, Patrick Pantel, and Eduard Hovy Information ... Interestingly, cosine similarity is widely used in NLP for various applications such as clustering. In this paper, we perform high speed similarity list creation for nouns collected from a huge web corpus....

Ngày tải lên: 08/03/2014, 04:22

... modulation for optical communications, ” IEEE Communications Magazine, vol. 36, no. 12, pp. 95–99, 1998. [13] T. Svedek and S. Rupcic, “Anisochronous modulation methods for optical short-range wireless ... “Combined pulse shape and pulse position modulation for high data rate transmissions in ultra-wideband communications, ” Interna- tional Journal of Wireless Information Networks,vol.10,no.4, pp. 167–178, ... “Orthonormal pulses for high data rate communications in indoor UWB systems,” IEEE Communications Letters, vol. 9, no. 5, pp. 405– 407, 2005. [4]J.A.N.daSilvaandM.L.R.deCampos,“Methodfor obtaining...

Ngày tải lên: 21/06/2014, 08:20

... of configuration E for light undergo- ing up to five reflections. power uniformity of the transmitter has yet to be optimized. For high performance wireless diffuse links with uniform power illumination ... diversity receivers for high- speed infrared wireless communication,” IEEE Communications Magazine, vol. 36, no. 12, pp. 88–94, 1998. [22] P. Djahani and J. M. Kahn, “Analysis of infrared wireless links employing ... Transactions on Communications, vol. 48, no. 12, pp. 2077–2088, 2000. [14] J. M. Kahn, R. You, P. Djahani, A. G. Weisbin, K. T. Beh, and A. Tang, “Imaging diversity receivers for high- speed infrared wireless...

Ngày tải lên: 21/06/2014, 17:20

... the range-cell migration with a high- order range- azimuth coupling form is processed by a nonlinear frequency scaling operation, which is different from the original frequency scaling one. Due to ... nonlinear frequency scaling method is presented. Inspired by the NCS algorithm, the FS operation has been extended to the cubic order to perform a more accu- rate SRC. Before the nonlinear frequency ... f ref = 0 before the frequency scaling operation will simplify the expressions of H FS , H MF ,andH AF . 3. SIMULATION RESULTS In order to evaluate the proposed algorithm, some simula- tions for an...

Ngày tải lên: 21/06/2014, 22:20

... WiFi to be used in a dis- aster, we developed long-range and high- speed wireless LAN units to establish makeshift but high- speed wireless LAN net- works. These networks would establish communication ... Journal on Wireless Communications and Networking Volume 2008, Article ID 724010, 13 pages doi:10.1155/2008/724010 Research Article Development of Long-Range and High- Speed Wireless LAN for the ... earthquake and to reinforce the rescue measures for victims. 10 EURASIP Journal on Wireless Communications and Networking (a) (b) Figure 16: Equipment at the main drill site: (a) wireless LAN unit and...

Ngày tải lên: 22/06/2014, 06:20

... signal modulation experiments have been performed at lower temperatures, but the high speed performance at 85 °C is crucial for most short-distance optical interconnect applications. Thus, we ... simultaneously to a significant lateral compositional modulation and high QD density [34], resulting in a high material and modal gain. For ultrahigh -speed directly modulated VCSEL appli- cations it is extremely ... excellent static performance, i.e. high external efficiency even at 85 °C, these devices demon- strate the potential of this novel active material for temperature stable ultra high speed VCSELs. At...

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Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 09/07/2014, 08:16

... High- Speed Dedicated Physical Control CHannel HS-DSCH High- Speed Downlink Shared CHannel HS-PDSCH High- Speed Physical Downlink Shared CHannel HS-SCCH High- Speed Shared Control CHannel HSDPA High- Speed ... Control CHannel HSDPA High- Speed Downlink Packet Access HSPA High- Speed Packet Access HSUPA High- Speed Uplink Packet Access Abbreviations xvii Higher cell capacity and higher spectral efficiency ... radio access has evolved strongly alongside high- speed downlink packet access (HSDPA) and high- speed uplink packet access (HSUPA), together called high- speed packet access’ (HSPA). When the International...

Ngày tải lên: 01/06/2014, 09:38

... carrier frequency domain equalization (SCFDE) over a diffuse optical wireless (DOW) communications. Recently orthogonal frequency division multiplexing (OFDM) has been applied to DOW communications. However, ... growing interest for use in indoor wireless data transmission [1, 2]. Diffuse optical wireless (DOW) communications offer a viable alternative to radio frequency (RF) communication for indoor use ... receivers for optical signals. These opto electronic devices are cheaper as compared to RF equipments. Orthogonal frequency division multiplexing (OFDM) modulation is a promising modulation scheme for...

Ngày tải lên: 21/06/2014, 08:20

... performance for −40 and 40 dB and obtain better results for G SR /G RD = 0dB as in the individual channel estimation case. We show the BER performance for G SR /G RD ={−40, 0,40}dB,aswellasfortheperfect CSI ... Transactions on Information Theory, vol. 50, no. 12, pp. 3062–3080, 2004. [4] H. Do ˇ gan, “Maximum a posteriori channel estimation for cooperative diversity orthogonal frequency- division multi- plexing ... “Channel estimation for amplify-and-forward relaying: Cascaded against disintegrated estimators,” IET Communications, vol. 4, no. 10, pp. 1207– 1216, 2010. [8] J. W. Mark and W. Zhuang, Wireless Communication...

Ngày tải lên: 21/06/2014, 16:20

... Journal on Wireless Communications and Networking Volume 2007, Article ID 20258, 11 pages doi:10.1155/2007/20258 Research Article Practical Quantize-and-Forward Schemes for the Frequency Division ... assertion can be proven for the two combiners pro- vided in this paper, for more information see [12]). There- fore, one has to keep in mind that in quasistatic channels the performance gain due to ... optimum representa- tives for fixed transition levels and optimum transition lev- els for fixed representatives can be found. For a 4-QAM 2 EURASIP Journal on Wireless Communications and Networking SNRs...

Ngày tải lên: 22/06/2014, 00:20

... for a multimedia CDMA wireless system,” in Proceedings of 6th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wire- less: Merging onto the Information Superhighway ... beam- forming for wireless network is proposed in [17] where it is shown that a capacity increase is possible if array observa- tions are combined in the MMSE sense. Therefore, as a di- rection for ... (2002-03), High Speed Downlink Packet Access: Physical layer aspects, (Release 5)”. [3] B. Sayadi and I. Fijalkow, “Joint detection for multicode trans- mission in downlink high speed UMTS,”...

Ngày tải lên: 22/06/2014, 22:20