single carrier frequency division multiple access

... division multiple access MSE mean square error CFO carrier frequency offset OFDM orthogonal frequency division multiplexing CP cyclic prefix OFDMA orthogonal frequency division multiple access CRLB ... FDMA frequency division multiple access QPSK quaternary phase shift keying FFT fast Fourier transform SDMA space division multiple access IBI inter-block interference SB subspace ICI inter-carrier ... Orthogonal Frequency Division Multiplex (OFDM) is widely accepted as a major technique for many future broadband wireless systems OFDMA, a multiuser OFDM using Frequency Division Multiple Access...

Ngày tải lên: 14/09/2015, 14:03

... Murugesa Pandian, Anna University Xavier Fernando, Ryerson University Orthogonal Frequency Division Multiple Access in WiMAX and LTE: A Comparison Group 4 – Trang 2 INTRODUCTION USE OF ... common technologies with subtle differences.The main common technology is orthogonal frequency-division multiple access (OFDMA). - There are many good reasons for choosing OFDMA such as multipath ... OFDMA IN WIMAX AND LTE Trang 5RESOURCE MAPPING FROM SUBCARRIERSUSE OF OFDMA IN WIMAX AND LTE Subcarriers are the smallest granular units in the frequency domain, OFDM symbol duration is the smallest...

Ngày tải lên: 24/07/2015, 22:26

... Sophisticated multiple access technology like frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple access (CDMA) ... access (OFDMA) is chosen while single carrier frequency division multiple access (SC-FDMA), which uses similar wireless air interface as OFDMA, is the chosen uplink multiple access ... multiple access technologies based on orthogonal frequency division multiplexing (OFDM) air interface were chosen [8] In the downlink, the popular orthogonal frequency division multiple...

Ngày tải lên: 08/09/2015, 18:24

... investigate the use of single carrier frequency domain equalization (SCFDE) over a diffuse optical wireless (DOW) communications Recently orthogonal frequency division multiplexing (OFDM) has ... this reason, sin-gle carrier with frequency domain equalization systems have been proposed in optical communication as an alternative to OFDM [12,13] In [12], single carrier frequency domain Trang ... signals These opto electronic devices are cheaper as compared to RF equipments Orthogonal frequency division multiplexing (OFDM) modulation is a promising modulation scheme for indoor DOW communication...

Ngày tải lên: 21/06/2014, 08:20

... Spread-spectrum multiple access is a popular technique al-lowing several users to share the same bandwidth at the same time Spread spectrum is often equated with direct-sequence codivision multiple access ... case, the performance is the Trang 9same as if only one single layer would access the channel.The single-layer bit error probability (single-layer perfor-mance, SLP) therefore provides a lower ... interpretation are trans-missions with a significantly higher carrier frequency and/or shorter chip duration If we increase the carrier frequency to fC =50 GHz and decrease the chip duration by a...

Ngày tải lên: 22/06/2014, 23:20

... Revised 5 February 2004 Space-division multiple-access (SDMA) systems that employ multiple antenna elements at the base station can provide much higher capacity than single-antenna-element systems ... capacity notions originated from single-user case They are easily extended to cases with multiple users The outage capacity issue for single-user multiple-input multiple-output (MIMO) case was ... of multiple-access system with multiple antennas at the base station Most previous studies are constrained to either fixed channel condition [11,12] or ergodic capacity region [13] The space-division...

Ngày tải lên: 23/06/2014, 01:20

... 6C H A P T E R 3 Cellular Code Division Multiple Access In the previous chapter, we examined direct sequence and frequency-hopped forms of spread spectrum in both single-user and multiuser environments ... the desired signal As the single interferer grows very strong relative to the desired signal, performance is essentially unaffected Trang 370 CODE DIVISION MULTIPLE ACCESS (CDMA)10 − 3 10 − 2 ... written as Trang 2SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 69where P2is the probability of any two users hopping to the same frequency in the same symbol duration For independent...

Ngày tải lên: 07/08/2014, 21:20

... capacity of CDMA systems As a result, capacities for single-cell CDMA systems can be substantially lower than those fororthogonal multiple access techniques such as TDMA or FDMA In addition, if ... Detection As discussed in previous chapters, the conventional matched filter receiver treats multiple accessinterference (MAI), which is inherent in CDMA, as if it were additive noise because, ... K ^ ^ ^ FIGURE 5.3: Block diagram of generic linear sub-optimal receiver structures If the multiple access channel (excluding noise) is viewed as a deterministic multi-input multi-output linear...

Ngày tải lên: 07/08/2014, 21:20

... CODE DIVISION MULTIPLE ACCESS (CDMA) [14] F A Tobagi and L Kleinrock, “Packet switching in radio channels: Part III—Polling and (dynamic) split-channel reservation multiple access, ... C Wu and V O K Li, “Receiver-initiated busy-tone multiple access in packet radio networks,”... synchronous code- division multiple- access channel,” IEEE Transactions on Communications, ... Data Communications, pp 39–49, 1997 [17] Z J Haas and J Deng, “Dual busy tone multiple access (DBTMA)—a multiple access control scheme for ad hoc networks,” IEEE Transactions on Communications,...

Ngày tải lên: 07/08/2014, 21:20

... OF MULTIPLE ACCESS MULTI-CARRIER MULTILEVEL FREQUENCY SHIFT KEYING SYSTEMS TAY HAN SIONG NATIONAL UNIVERSITY OF SINGAPORE 2005 Trang 2OPTIMIZING PERFORMANCE OF MULTIPLE ACCESS MULTI-CARRIER ... MC-MFSK systems transmit on multiple frequency carriers simultaneously The system allows multiple-user access with its users sharing the same frequency and time space These multiple users are differentiated ... line-of-sight (LOS) carriers of the multiple signals into a single LOS carrier, and combining the multipath components of multiple signals with other Gaussian noises to form a single Gaussian process...

Ngày tải lên: 27/11/2015, 12:32

... 575706, 12 pages doi:10.1155/2011/575706 Research Article Frequency-Domain Block Signal Detection with QRM-MLD for Training Sequence-Aided Single-Carrier Transmission Tetsuya Yamamoto, Kazuki Takeda, ... improve the bit error rate (BER) performance of the cyclic prefix inserted single-carrier (CP-SC) block transmission in a frequency-selective fading channel However, the use of a fairly large number ... paths with different time delays, the channel becomes severely frequency selective as the transmission data rate increases When the single-carrier (SC) transmission without any equalization technique...

Ngày tải lên: 21/06/2014, 08:20

... SC-FDMA (single-carrier frequency-division multiple access) and OFDMA (orthogonal frequency-division multiple access), where a linear frequency-domain equalizer is assumed to combat frequency ... OFDM (orthogonal frequency-division multiplexing) and SC-FDE (single-carrier system with frequency domain equalization), are recognized as two popular techniques to combat the frequency selectivity ... it has been developed only recently, called single-carrier FDMA (SC-FDMA) [4]. (A single-carrier waveform can only be obtained for some specific sub-carrier mapping constraints. In this paper we...

Ngày tải lên: 21/06/2014, 23:20

... basically be used for any single-carrier system, including also CDMA [8] This paper develops high performance single-carrier FDE techniques without CP by the use of highly frequency-selective filter ... the reference systems are given 2 FFT BASED FREQUENCY-DOMAIN EQUALIZATION IN A SINGLE-CARRIER TRANSMISSION Throughout this paper, we consider single-carrier block transmission over a linear bandlimited ... problems of multicarrier and CDMA techniques In recent years, the idea of single-carrier trans-mission in broadband wireless communications has been revived through the application of frequency-domain...

Ngày tải lên: 22/06/2014, 23:20

... Buratti et al. Cross-Layer Design of an Energy-Efficient Cluster Formation Algorithm with Carrier-Sensing Multiple Access for Wireless Sensor Networks Chiara Buratti IEIIT-BO/CNR, DEIS, University of ... the appendix Information routing is based on a clustered self-organized structure; a carrier-sensing multiple access (CSMA) protocol is chosen at MAC layer Two different scenarios are examined, ... and clear-to-send (CTS) packets When dealing with collision-prone MAC techniques, carrier-sensing multiple access (CSMA) is a usual choice in WSNs [21] The advantage here is that no extra signalling...

Ngày tải lên: 23/06/2014, 00:20

... Trang 1Carrier Sense Multiple Access with Collision AvoidanceCarrier Sense Multiple Access with Collision Avoidance Trang 21 Basic CSMA/CA operation 2 Wireless medium access example 3 ... Trang 22Wireless medium access (2)”winner” and starts sending packet 3 4 AC K 2 Wireless medium access example Trang 23Wireless medium access (3)DIFS 5 AC K 2 Wireless medium access example Trang ... 9Wireless medium access (4)ACK (B=>A) Transmitted frame (A=>B)  Physical carrier sensing It means that the physical layer (PHY) informs the MAC layer when a frame has been detected Access priorities...

Ngày tải lên: 06/10/2014, 21:38

... loading Multiple access The resources available in a CR system must be shared among the radios OFDM supports several multiple access techniques In Frequency Division Mul-tiple Access (FDMA), subcarriers ... 16MINLP Mixed integer nonlinear programmingOFDM Orthogonal frequency division multiplexing OFDMA Orthogonal frequency division multiple access SIND Signal to interference-plus-noise difference SINR ... and TDMA, a combinato-rial multiple access scheme was invented for OFDM systems known as orthogonal frequency division multiple access (OFDMA) OFDMA partitions both frequency and time dimensions,...

Ngày tải lên: 09/09/2015, 10:19

... text (HTML) versions will be made available soon. Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks optimal and suboptimal estimators EURASIP ... Signal Trang 2Decentralized estimation over orthogonal access fading channels in wireless sensor networks— optimal and suboptimal estimatorsmultiple-Xin Wang∗1 and Chenyang Yang1 1 School of Electronics ... suboptimal decentralized estimators in wireless sensor networks over orthogonal access fading channels in this paper Considering multiple-bit quantization for digital transmission, we developmaximum likelihood...

Ngày tải lên: 18/06/2014, 22:20

... text (HTML) versions will be made available soon. Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks optimal and suboptimal estimators EURASIP ... Signal Trang 2Decentralized estimation over orthogonal access fading channels in wireless sensor networks— optimal and suboptimal estimatorsmultiple-Xin Wang∗1 and Chenyang Yang1 1 School of Electronics ... suboptimal decentralized estimators in wireless sensor networks over orthogonal access fading channels in this paper Considering multiple-bit quantization for digital transmission, we developmaximum likelihood...

Ngày tải lên: 20/06/2014, 04:20