multipoint fft for scalable ofdma based systems

... algorithm performances in Section The modified and scaled Gram-Schmidt QR decomposition algorithm Hun Seok Kim et al y1 y1 , n1 y2 Linear y , n MMSE MIMO detector y4 y , n4 FFT FFT FFT N0 H Channel ... algorithm Gram-Schmidt QR -based Givens QR -based 14 Fixed point computation H, N0 I (input) As or A1/2 SQ Square-Root MMSE algorithm Gram-Schmidt QR -based Givens QR- based 14 14 19 16 QS or QSQ ... counts for computing WMMSE and n (4 × detector) Squared MMSE Givens rotation QR -based Gram-Schmidt QR -based Adjusted operation counts 1150.50 872.50 Square-Root MMSE Givens rotation QR -based Gram-Schmidt...

Ngày tải lên: 21/06/2014, 22:20

... MMSE solution for the uplink of OFDMA- based multiuser MIMO systems It is designed based on the autocorrelation matrix C rr and the cross-correlation matrix Crs It is only optimal for systems with ... curve for a QPSK system with the conventional receiver is also provided for a baseline comparison Note that for the conventional receiver, the BER performance for an OQPSK system is the same as for ... algorithm for an OFDMA- based multiuser MIMO system with −1 10 −2 BER 10 −3 10 −4 10 4ASK Conv QPSK Conv 4ASK Impr 10 15 20 Eb/N0 [dB] 25 30 35 Figure BER performance for the uplink of OFDMA system...

Ngày tải lên: 20/06/2014, 22:20

... Low complexity utility based resource allocation for 802.16 OFDMA systems in Proceedings of WCNC 2008, (Las Vegas, NV, 2008) 20 Recommendation ITU-R M.1225: guidelines for evaluation of radio ... technologies for IMT-2000, Technical Report (1997) doi:10.1186/1687-1499-2011-67 Cite this article as: Akbudak et al.: A cross-layer resource allocation scheme for spatial multiplexing -based MIMO -OFDMA systems ... utility -based power-control scheme in wireless cellular systems IEEE/ACM Trans Netw 11, 210–221 (2003) doi:10.1109/TNET.2003.810314 P Liu, ML Honig, S Jordan, Forward-link cdma resource allocation based...

Ngày tải lên: 21/06/2014, 01:20

... algorithms for OFDMA- based resource allocation in systems such as Single Input Single Output (SISO) - OFDMA, Multiple Input Multiple Output (MIMO) - OFDMA, OFDMA relaying and OFDMA- based Cognitive ... joint direct and relaying path scenario for uplink OFDMA systems Subsequently, many studies for relay-assisted OFDMA systems have been presented [25] For simplicity of system implementation, ... Channel State Information (CSI) mechanism and present a method to achieve adjustable Quality-of-Service (QoS) for SISO -OFDMA systems • Extend the SISO -OFDMA resource allocation to MIMO -OFDMA scenario...

Ngày tải lên: 11/09/2015, 10:15

... right platform Such a model may become increasingly useful for other cloud services and usages such as geo location services supported by platform based information regarding the platform location, ... platform identity versus user identity In particular we show that platform capability based information denoted by platform identity has a low user touch and a well controlled methodology for ... allow for flexible and efficient revocation of the ID information There is high concern for user ID information and the inability to revoke it due to the untracked and mismanaged user ID information...

Ngày tải lên: 31/07/2013, 09:45

... Based STATCOM Topology Suitable for · · · Fig Fig Circuit structure of the MMC based STATCOM and the way of its connection to the network to a medium-voltage network without a coupling transformer ... voltage, all for phase a component must be the same for the corresponding legs of the NL-HBCC and the PL-HBCC, while the value of the DC voltage component must be in the inverted form for them As ... used in the simulation study The load current waveforms and the source-end current waveforms, before and after compensation, are shown in Fig Before the start time (tS = 0.1S), the compensator...

Ngày tải lên: 15/10/2013, 16:24

... navigate based on spatial and visual instructions provided to them User simulation modules are usually developed to train and test reinforcement learning based interactive spoken dialogue systems ... Candidate Navigation Systems This framework can be used to evaluate a variety of navigation systems Route navigation has been an interesting research topic for researchers in both geoinformatics and ... etc), we focus on systems that generate instructions in natural language Therefore, our framework does not include systems that generate routes on 2D/3D maps as navigation aids Systems that generate...

Ngày tải lên: 07/03/2014, 18:20

... LTE for UMTS – OFDMA and SC-FDMA Based Radio Access LTE for UMTS: OFDMA and SC-FDMA Based Radio Access Edited by Harri Holma and Antti Toskala ... closure LTE for UMTS: OFDMA and SC-FDMA Based Radio Access Edited by Harri Holma and Antti Toskala © 2009 John Wiley & Sons, Ltd ISBN: 978-0-470-99401-6 14 LTE for UMTS – OFDMA and SC-FDMA Based Radio ... performance Development LTE for UMTS: OFDMA and SC-FDMA Based Radio Access Edited by Harri Holma and Antti Toskala © 2009 John Wiley & Sons, Ltd ISBN: 978-0-470-99401-6 24 LTE for UMTS – OFDMA...

Ngày tải lên: 08/03/2014, 09:20

... Translating Genomic -Based Research for Health were crucial to the planning and conduct of the workshop, Systems for Research and Evaluation for Translating Genome -Based Discoveries for Health Federal ... Systems for Research and Evaluation for Translating GenomE -Based discoveries for health W o r k s h o p S u m m a r y Theresa Wizemann, Rapporteur Roundtable on Translating Genomic -Based ... Medicine’s Roundtable on Translating Genomic -Based   SYSTEMS FOR RESEARCH AND EVALUATION Research for Health identified a need for a workshop to examine existing systems that could be adapted to evaluate...

Ngày tải lên: 15/03/2014, 15:20

... Application Architecture Traditional Client-Server Systems Thin- versus Thick-Client Systems Web -Based Client-Server Systems Software Components Operating Systems Application Service Components Third-Party ... Introduction Help System Analysis Types of Help Systems Application Help Systems Reference Help Systems Tutorial Help Systems Sales and Marketing Help Systems Evaluating the Target User Evaluating ... you effectively plan for and conduct the testing of Web -based applications developed for fixed clients, systems in fixed locations such as desktop computers, as well as for mobile clients such...

Ngày tải lên: 22/03/2014, 18:20

... with the time index for each batch, formally, we have p0 (t) and p1 (t) for the tth batch Given a term w, we use a sliding window of length L to estimate p0 (t) and p1 (t) for the tth batch as ... two documents However, it requires efforts for function selection and parameters tuning We summarize these discussions in Table split-cluster-merge algorithm for event detection In this section, ... experiments Then we compare the performance of different text representation models for event detection, namely BurstVSM and boostVSM (He et al., 2007b; He et al., 2007a).7 For different representation...

Ngày tải lên: 23/03/2014, 14:20

... (9.2.0.1.0) for UNIX Systems provide instructions for administering and configuring Oracle9i release (9.2.0.1.0) on UNIX systems Audience This document is intended for anyone responsible for administering ... the oracle account Security for Database Files See the Oracle9i Installation Guide Release (9.2.0.1.0) for UNIX Systems for information on the appropriate permissions for database files Administering ... maximum of eight characters for system identifiers For more information on this environment variable, see the Oracle9i Installation Guide Release (9.2.0.1.0) for UNIX Systems Example ORAENV_ASK...

Ngày tải lên: 07/04/2014, 15:57

... (9.2.0.1.0) for UNIX Systems provide instructions for administering and configuring Oracle9i release (9.2.0.1.0) on UNIX systems Audience This document is intended for anyone responsible for administering ... the oracle account Security for Database Files See the Oracle9i Installation Guide Release (9.2.0.1.0) for UNIX Systems for information on the appropriate permissions for database files Administering ... maximum of eight characters for system identifiers For more information on this environment variable, see the Oracle9i Installation Guide Release (9.2.0.1.0) for UNIX Systems Example ORAENV_ASK...

Ngày tải lên: 07/04/2014, 16:30

... (9.2.0.1.0) for UNIX Systems provide instructions for administering and configuring Oracle9i release (9.2.0.1.0) on UNIX systems Audience This document is intended for anyone responsible for administering ... the oracle account Security for Database Files See the Oracle9i Installation Guide Release (9.2.0.1.0) for UNIX Systems for information on the appropriate permissions for database files Administering ... maximum of eight characters for system identifiers For more information on this environment variable, see the Oracle9i Installation Guide Release (9.2.0.1.0) for UNIX Systems Example ORAENV_ASK...

Ngày tải lên: 07/04/2014, 16:51

... cycles of 98°C for sec, 59°C for 10 sec, and 72°C for 15 sec, followed by a final extension at 72°C for minutes (min) LASV NP was amplified using the following cycling conditions: 98°C for one 30 ... reducing environment and is, therefore, not conducive to expression of proteins that require disulfide bond formation for correct folding This represented a critical point for consideration with regard ... this work provides a gateway for development of a recombinant protein ELISA -based system for early diagnostic detection of arenaviral infections in The MBP fusion -based pMAL-vector system (New...

Ngày tải lên: 20/06/2014, 01:20

... maintain the link between them for the whole period of communication To solve the aforementioned problems, we propose a novel MAC protocol called clustering and OFDMAbased MAC (COMAC) protocol where ... topology such as in VANETs Therefore, we propose a distributed and dynamic cluster -based MAC protocol called COMAC, which integrates OFDMA with the contention -based DCF algorithm in IEEE 802.11p ... subsection The field Type has four values: is for cluster member’s status message; is for cluster head’s first message; is for cluster head’s invitation message; is for cluster head’s last message The...

Ngày tải lên: 20/06/2014, 22:20

... performance for −40 and 40 dB and obtain better results for GSR /GRD = dB as in the individual channel estimation case We show the BER performance for GSR /GRD = {−40, 0, 40} dB, as well as for ... Figure 2: Performance of the individual channel estimation approach (a) MSE versus SNR, (b) BER performance versus SNR received signals rD1 (m) and rD2 (m) by using this channel information Figure ... and R → D for GSR /GRD = {−40, 0, 40} in dB We see that we obtain the best channel estimation for dB which corresponds to equal distance between S → R and R → D We give the BER performances at...

Ngày tải lên: 21/06/2014, 16:20

... Subcarrier based (ζ = 0.15) User separation based (ζ = 0.15) Tile based (ζ = 0.15) Tile based with tile size detection (ζ = 0.15) Subcarrier based (ζ = 0.5) User separation based (ζ = 0.5) Tile based ... subcarrier based, user separation based, tile based with known tile size, and tile based with estimated tile size It is observed that the subcarrier -based method yields the worst performance, ... tile -based method for both optimum and nonoptimum thresholds 10 Concluding Remarks 10 15 20 SNR (dB) 25 30 Subcarrier based (ζ = 0.15) User separation based (ζ = 0.15) Tile based (ζ = 0.15) Tile based...

Ngày tải lên: 21/06/2014, 19:20

... schemes First, the bit error performance of the proposed CFFH scheme, and the conventional FH and FH -OFDMA systems is performed under AWGN channels Second, the bit error performance of the proposed ... SJR=0 dB for the three systems Recall that the jammer occupancy is the fraction of subcarriers that experience interference We can see that the STCCFFH system outperforms the other systems for all ... Then, the ML space-time decoding is performed for each Ri (n) Remark In the discussion above, we focused on STCCFFH system for the downlink case, where the information is transmitted from base station...

Ngày tải lên: 21/06/2014, 20:20

... adaptive iQRRLM -based BM-PTEQ (ABM-PTEQ), adaptive RLM -based PTEQ [6], and adaptive RLM -based BM-TEQ (ABM-TEQ) [12] which compared with BM-TEQ [11] and proposed MMSE -based BMPTEQ for ADSL downstream ... 3: The bit rate performance of the BM-TEQ [11], adaptive RLM -based BM-TEQ (ABM-TEQ) [12], proposed MMSE -based BM-PTEQ, and proposed adaptive iQRRLM -based BM-PTEQ (ABM-PTEQ) for all CSA loop nos ... and proposed adaptive iQRRLM -based BM-PTEQ were initialised at δ0 = 10−3 for all active tones The forgetting-factor λ of the adaptive RLM -based PTEQ [6], the RLM -based adaptive BM-TEQ (ABM-TEQ)...

Ngày tải lên: 21/06/2014, 20:20