stc over ofdm systems
space-time.coding.john.wiley.and.sons.ebook
Ngày tải lên :
26/10/2014, 14:30
... Space-Time Codes Over OFDM Systems 8.7.1 Concatenated RS -STC over OFDM Systems 8.7.2 Concatenated CONV -STC over OFDM Systems 8.7.3 ST Turbo TC over OFDM Systems ... Performance of concatenated RS -STC over OFDM systems Performance of concatenated CONV -STC over OFDM systems Performance of ST turbo TC over OFDM systems An open-loop ... 8.3 STC in Wideband OFDM Systems 8.3.1 OFDM Technique 8.3.2 STC- OFDM Systems 8.4 Capacity of STC- OFDM Systems ...
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Space time coding for mimo rayleigh fading systems
Ngày tải lên :
14/09/2015, 12:11
... Channel Correlation on the Performance of STC 32 2.2.4 Space-time Trellis Code and Space-time Block Code 36 BLAST Systems 43 2.3.1 Overview of BLAST Architectures ... Two-user Systems 56 3.3.2 Pairwise Error Probability of K-user Systems 59 3.3.3 The Special Cases 61 3.4 Code Design Criteria for Multiuser Composite Fading Systems ... gain and transmission rate [3] In 1998, Alamouti proposed a simple STC scheme for systems with two transmit antennas [53] This STC is later referred to as Alamouti’s code that enables the linear...
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Báo cáo hóa học: " Research Article Physical Layer Built-In Security Analysis and Enhancement Algorithms for CDMA Systems" pptx
Ngày tải lên :
22/06/2014, 19:20
... system and the results can be directly applied to 3GPP systems Once the long-code sequence is recovered, the desired user’s signal can be recovered through signal separation and extraction techniques ... wireless systems From the previous two sections, we can see that with a slight increase in complexity, the physical layer built-in security of the CDMA systems can be improved significantly Moreover, ... security from CDMA systems to other wireless systems is partially possible For example, the secure scrambling block can be implemented after the channel encoder in any wireless systems to introduce...
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Báo cáo hóa học: " Research Article Censored Distributed Space-Time Coding for Wireless Sensor Networks" pptx
Ngày tải lên :
22/06/2014, 19:20
... which entail a large required bandwidth especially in dense WSNs with a large number of sensors To overcome the bandwidth limitations of orthogonal transmission in WSNs, the application of coherent ... in [14] eliminate the various restrictions and drawbacks of the coherent scheme in [11] (ii) Moreover, it is shown that censoring of local decisions is essential for the efficient application of ... that d will typically be calculated at the FC and the value of d has to be conveyed to the sensors over a feedback channel However, this feedback channel can be very low rate assuming that the statistical...
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Báo cáo hóa học: " A Low-Complexity Approach to Space-Time Coding for Multipath Fading Channels" ppt
Ngày tải lên :
23/06/2014, 00:20
... probability Figure 2: Comparison with previously proposed STC schemes (2Tx-antenna systems over 2-path ISI channel) in agreement with standard STC literature In the following, the simulated WER curves ... the scheme proposed in [26] for trellis STCs over the frequency-flat MIMO channel The block diagram of the receiver is shown in Figure 1b A Low-Complexity STC for Multipath Fading Channels 441 ... of N symbols each over the MISO channel defined by (1) by using a TRSTBC scheme with parameters [T, M, k, N, L], the columns of T(x1 , , xk ) are transmitted in parallel, over the M antennas,...
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Real time concepts for embedded systems
Ngày tải lên :
08/03/2016, 11:37
... introduction to embedded systems and real-time embedded systems, this chapter focuses on: • examples of embedded systems, • defining embedded systems, • defining embedded systems with real-time ... all real-time systems embedded However, the two systems are not mutually exclusive, and the area in which they overlap creates the combination of systems known as real-time embedded systems Figure ... differentiates hard real-time systems from soft real-time systems • Real-time systems have a significant amount of application awareness similar to embedded systems • Real-time embedded systems are those...
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Báo cáo sinh học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" ppt
Ngày tải lên :
18/06/2014, 22:20
... occupies OFDM symbol at subcarrier K1 , xk,1,2 occupies OFDM symbol at subcarrier K2 , , and xk,1,Nc occupies OFDM symbol Nc at subcarrier KNc The next transmitted symbol xk,1,1 occupies OFDM ... proposed OFDM- CDMA has efficient mapping in bit allocation in space, time and frequency without degrading overall system performance, and therefore it is less complex In other OFDM- CDMA systems, ... Paulraj, On the capacity of OFDM- based spatial multiplexing systems IEEE Trans Commun 50(2), o 225–234 (2002) 21 [16] Z Liu, Y Xin, GB Giannakis, Space-time-frequency coded OFDM over frequency-selective...
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Báo cáo toán học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" pptx
Ngày tải lên :
20/06/2014, 21:20
... occupies OFDM symbol at subcarrier K1 , xk,1,2 occupies OFDM symbol at subcarrier K2 , , and xk,1,Nc occupies OFDM symbol Nc at subcarrier KNc The next transmitted symbol xk,1,1 occupies OFDM symbol ... proposed OFDMCDMA has efficient mapping in bit allocation in space, time and frequency without degrading overall system performance, and therefore it is less complex In other OFDM- CDMA systems, ... parameters N t , and N c , the OFDM- CDMA 60 Proposed OFDM- CDMA 2D OFDM- CDMA Number of Users 50 40 30 20 10 0 10 12 14 16 SNR dB Figure 10 System throughput comparison for OFDM- CDMA system with 4Tx,...
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mandyam, g. (2002). third-generation cdma systems for enhanced data services
Ngày tải lên :
18/04/2014, 12:26
... Contents Preface Introduction to Cellular Systems vii Direct-Sequence Spread Spectrum Systems 13 The Mobile ChaMel and Diversity Reception in CDMA Systems 41 An Overview of IS-95 and cdma2000 57 5.1X-EV: ... Introduction to Cellular Systems Key Topics: Cell, mobile station, base station, PSTN, BSC, MSC, cluster, FDMA, TDMA, CDMA Overview: An overview of cellular telephony systems is provided in this ... Cellular telephony systems are radio systems that involve distributed transmission Therefore, rather than having a single transmitter service many different users over a wide area of coverage (e.g.,...
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báo cáo hóa học: " Low PAPR space frequency block coding for multiuser MIMO SC-FDMA systems: specific issues for users with different spectral allocations" ppt
Ngày tải lên :
21/06/2014, 00:20
... space-time-frequency coded MIMO -OFDM systems using Chu sequences IEEE Trans Wireless Commun 7(4), 1195–1202 (2008) T Jiang, Y Wu, An overview: peak-to-average power ratio reduction techniques for OFDM signals IEEE ... band-limited OFDM systems IEEE J Sel Areas Commun 18(11), 2270–2277 (2000) doi:10.1109/49.895032 C Ciochina, F Buda, H Sari, An analysis of OFDM peak power reduction techniques for WiMAX systems, ... to each user not overlap inside of each group, but each user of each group can have overlapping subcarriers with a maximum of two users from the other group, such as onto the overlapping subcarriers...
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Báo cáo hóa học: " Binary De Bruijn sequences for DS-CDMA systems: analysis and results" pptx
Ngày tải lên :
21/06/2014, 03:20
... values, leading to the well-known error-floor in the BER curves of DS-CDMA systems Phase-coded spread spectrum multiple access systems, such as DS-CDMA, may be analyzed by modelling phase shifts, time ... but not considered, at the authors’ best knowledge, in the framework of multi-user communication systems, as a candidate family of spreading codes to apply Binary De Bruijn sequences are a special ... number of distinct sequences of span n is 22(n−1) −n; in the more general case of span n sequences over an alphabet of cardinality, a, the number of distinct α sequences is α (n−1) αn In this article,...
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Báo cáo hóa học: " Research Article Robust Blind Frequency and Transition Time Estimation for Frequency Hopping Systems" doc
Ngày tải lên :
21/06/2014, 08:20
... (0) , is set, where the number in the superscript bracket stands for the iteration number and the overscript with the sign of a hat stands for “estimated value.” For example, K (0) denotes the estimated ... channel gains of the two frequencies are assumed to be approximately the same as for regular applied systems) To solve the problem of ω1 ≈ ω2 , a method is proposed in which the value K (0) is adjusted ... that is around M/2 instead of all possible M’s Real-time computing refers to hardware and software systems that are subject to a real-time constraint The BigOh notation is well accepted for analyzing...
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Báo cáo hóa học: " Research Article Adaptive Channel-Tracking Method and Equalization for MC-CDMA Systems over Rapidly Fading Channel under Colored Noise" doc
Ngày tải lên :
21/06/2014, 08:20
... DS/SFH-CDMA systems for overlay systems, ” IEEE Transactions on Wireless Communications, vol 1, no 3, pp 448–455, 2002 S Kondo and L B Milstein, “Performance of mMulticarrier DS CDNA systems, ” IEEE ... will destruct the orthogonality and is not feasible for MCCDMA systems The frequency-domain channel-estimation methods in the MC-CDMA systems will fail if the channel contains colored noise It is ... IDFT), and the OFDM symbol sn (k) is produced as follows (see Figure 1): N −1 sn (k) = √ Sn (m)e j2πmk/N N m=0 (4) for k = 0, 1, , N − A guard interval is inserted between successive OFDM symbols...
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Báo cáo hóa học: " Research Article Minimum BER Receiver Filters with Block Memory for Uplink DS-CDMA Systems" pdf
Ngày tải lên :
21/06/2014, 22:20
... Figure that the difference between the MMSE and minimum BER systems is very small when M = 31 It is seen that the overall performances of the systems are improved when M increases since more bandwidth ... the minimum BER DS-CDMA systems are shown in Figure for different number of users N From Figure 3, it is seen that when N = 1, the performances of the MMSE and minimum BER systems are almost the ... performances of the MMSE and the proposed minimum BER systems when M = 7, L = 5, and N = and l ∈ {0, 1, 2} When l increases, the performance of the two systems improves From Figure 5, it is seen that...
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Báo cáo hóa học: " Research Article Performance of Turbo Interference Cancellation Receivers in Space-Time Block Coded DS-CDMA Systems" pot
Ngày tải lên :
21/06/2014, 23:20
... used, the overall code rate of both systems is not affected, thus the puncturing pattern used determines the total system code rate Furthermore, we assume that the effects of puncturing on the overall ... configuration evaluated over four receiver iterations Depending on the diversity configuration employed, it can be noted that the IA receiver maintains a considerable capacity gain over the PA 5.2 Comparison ... for the K = and K = 15 user systems, respectively Simulations are considered for a synchronous system with N = 15 for both nondiversity and × diversity turbo coded systems employing an iterative...
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Báo cáo hóa học: " Research Article A Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems" docx
Ngày tải lên :
22/06/2014, 00:20
... Petroleum and Minerals REFERENCES [1] J G Andrews, “Interference cancellation for cellular systems: a contemporary overview,” IEEE Wireless Communications, vol 12, no 2, pp 19–29, 2005 [2] R M Buehrer, ... Letters, vol 11, no 2, pp 176–178, 2007 [8] A Kapur and M K Varanasi, “Multiuser detection for overloaded CDMA systems, ” IEEE Transactions on Information Theory, vol 49, no 7, pp 1728–1742, 2003 [9] ... and upper-right block triangular parts of R If D is positive definite, then the block successive overrelaxation method is convergent for all yo if and only if < μ < and R is positive definite Thus,...
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Báo cáo hóa học: " Research Article A Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems" doc
Ngày tải lên :
22/06/2014, 06:20
... Petroleum and Minerals REFERENCES [1] J G Andrews, “Interference cancellation for cellular systems: a contemporary overview,” IEEE Wireless Communications, vol 12, no 2, pp 19–29, 2005 [2] R M Buehrer, ... Letters, vol 11, no 2, pp 176–178, 2007 [8] A Kapur and M K Varanasi, “Multiuser detection for overloaded CDMA systems, ” IEEE Transactions on Information Theory, vol 49, no 7, pp 1728–1742, 2003 [9] ... and upper-right block triangular parts of R If D is positive definite, then the block successive overrelaxation method is convergent for all yo if and only if < μ < and R is positive definite Thus,...
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Báo cáo hóa học: "Research Article Neural Network Adaptive Control for Discrete-Time Nonlinear Nonnegative Dynamical Systems" ppt
Ngày tải lên :
22/06/2014, 11:20
... macroscopic subsystems known as compartments The range of applications of nonnegative systems and compartmental systems includes pharmacological systems, queuing systems, stochastic systems whose ... state variables represent probabilities , ecological systems, economic systems, demographic systems, telecommunications systems, and transportation systems, to cite but a few examples Due to the severe ... 2 Advances in Difference Equations nonnegative dynamical systems are compartmental systems 8–18 Compartmental systems involve dynamical models that are characterized by conservation...
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Báo cáo hóa học: " Research Article Cross-Layer Admission Control Policy for CDMA Beamforming Systems" docx
Ngày tải lên :
22/06/2014, 19:20
... the following aspects: (a) here multiple antenna systems are investigated which provide a large capacity gain, while in [4–6], only single antenna systems are discussed; (b) in this paper, a cross-layer ... to mitigate the outage 3.2 ARQ-based ROP We first define two types of PERs The overall achieved PER, j denoted by PERoverall , is defined as the probability that a class j packet is incorrectly received ... j =2 p j K j β j B γjRj , K1 l=1,l=i φil p K1 − β + pj j j PERoverall = (18) = PERin (l), l=1 ≤ ρj, where ρ j denotes the target overall PER for class j (22) EURASIP Journal on Wireless Communications...
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