time trellis codes on fast fading channels

... Estimation on Code Performance Design of Space -Time Trellis Codes on Fast Fading Channels Performance Evaluation on Fast Fading Channels Space -Time Turbo Trellis Codes ... the trace criterion on slow fading channels with two transmit and two receive antennas Performance comparison of the QPSK codes based on the trace criterion on slow fading channels with three ... comparison of the QPSK codes based on the trace criterion on slow fading channels with four transmit and two receive antennas Performance comparison of the 8-PSK codes based on the trace criterion...

Ngày tải lên: 26/10/2014, 14:30

... in space Sometimes the quasi-static fading or rapid fading is hardly the accurate description of the fading environment The block fading, such 12 1.3 Literature Review as the one considered in ... decomposition SIC successive interference cancellation SNR signal-to-noise ratio SQRD sorted QRD ST space -time STC space -time code STTC space -time trellis code STBC space -time block code TCM trellis ... rapid fading This motivates us to study the code design in composite fading channels, in which some users have quasi-static fading channels and the others have rapid fading channels Our discussion...

Ngày tải lên: 14/09/2015, 12:11

... Transactions on Information Theory, vol 15, no 1, pp 122– 127, 1969 [4] S Bhashyam and B Aazhang, “Multiuser channel estimation and tracking for long-code CDMA systems,” IEEE Transactions on Communications, ... follows (1) The base station and the mobile station share a common initial state for the LFSR and an L-bit (L = 128, 192 or 256) common secret encryption key K (2) The long scrambling sequence ... between the mobile station and base station can be updated from time to time To prevent malicious key reload, the key update request can only be initiated from the base station SECURITY OF THE PROPOSED...

Ngày tải lên: 22/06/2014, 19:20

... optimization of the local decision/censoring threshold is provided in Section Simulation and numerical results are given in Section 5, while some conclusions are drawn in Section Notation In this ... symbol duration This is usually a reasonable assumption for low-rate WSN applications We refer the interested reader to [18] for a more detailed discussion on time synchronism in the context of ... decision) Therefore, only noncoherent decision rules will be considered in the next section The received vector can be expressed as FC DECISION RULES AND PERFORMANCE ANALYSIS In this section, we...

Ngày tải lên: 22/06/2014, 19:20

... equalization and decoding For example, trellis coding and bit-interleaved coded modulation (BICM) with turbo equalization have been proposed in [9, 13] Time- reversal orthogonal space -time block codes ... Fitz, and O Y Takeshita, “Space -time codes performance criteria and design for frequency selective fading channels, ” in Proc IEEE International Conference on Communications (ICC ’01), vol 9, pp 2800–2804, ... found on the surviving paths of the Viterbi decoder acting on the trellis of the TCM code Since the joint equalization and decoding scheme works on the trellis of the original TCM code, without trellis...

Ngày tải lên: 23/06/2014, 00:20

... results within a given time constraint Timing constraints include finish time, or both start time and finish time A good way to understand the relationship between real -time systems and embedded ... real -time systems Similar to embedded systems, real -time systems also have substantial knowledge of the environment of the controlled system and the applications running on it This reason is one ... sections Each section has a type Content is placed into a section if the section type matches the type of the content being stored A section also contains important information such as the load...

Ngày tải lên: 08/03/2016, 11:37

... allocated with one orthogonal code and spread its information data over the frequency and time domain uniformly In this study, it was not mentioned how this approach will perform in a MIMO environment, ... section, we will show the numerical evaluation that led to Equation (28) When M is large enough, the interference component will be the dominant component, M −1 M k=2 |ˆk |2 > z σ and Equation ... M Jankiraman, Space -Time Codes and MIMO Systems (Artech House, 2004) [21] M Chiani, D Dardan, Improved exponential bounds and approximation for the Q-function with application to average error...

Ngày tải lên: 18/06/2014, 22:20

... multi-media applications in Proc 1997 Int Symp Personal, Indoor and Mobile Radio Communications, Helsinki Finland, 100–104 (September 1997) S Kaiser, OFDM code-division multiplexing in fading channels IEEE ... Improved exponential bounds and approximation for the Q-function with application to average error probability computation in Proc IEEE Global Telecommunications Conference (GLOBECOM’02), Taipei, Taiwan, ... satisfy the orthogonality condition and to maintain independence, those rows needs to be picked as every Nf /Nc column, so then and ONLY then, each column and row are orthogonal The max rank...

Ngày tải lên: 20/06/2014, 21:20

... acceptable emissions limits are exceeded, the system may be in violation of national or international regulations For instance, the International Telecommunications Union (ITU) has emissions limits ... operation depicted in (2-15) is also known as a linear convolution operation Filters whose output is determined by a linear convolution operation are also known as Zinearfilters The convolution of ... processing gain when information rates increase for a given user MODULATION CONSTELLATIONS In Section 5, the concept of separating user information into in-phase and quadrature components was introduced...

Ngày tải lên: 18/04/2014, 12:26

... not correspond to a double SC-SFBC construction and the conventional MMSE simplified detector cannot be employed anymore A joint MMSE detection over all the bandwidth containing cross -codes subcarriers ... propagation conditions; for high mobility users not having access to reliable channel state information (CSI); or, more generally, for the transmission of sensitive data such as control information, ... low-complexity (inversion of one order-2 matrix for each of the M/2 Alamouti pairs in one SCFDMA symbol) Multi-user SC-SFBC So far, the study reviewed in the previous section concentrated on transmit diversity...

Ngày tải lên: 21/06/2014, 00:20

... channelization codes, thanks to the orthogonality ensured by codes belonging to the same set, i.e., at a parity of their Spreading Factor (SF) OVSF codes may show very differentiated correlation properties, ... account our focus on the correlation properties of the sequences, we introduce in the generation process a constraint related to cross-correlation: when two generation paths share a common pattern of ... spreading codes in terms of its cross-correlation performance The bound is a lower one, as a consequence, by evaluating such bound over different code sets we can draw conclusions about the one providing...

Ngày tải lên: 21/06/2014, 03:20

... the addition operations is O(N M) The proposed approach consists of the synchronization phase and the tracking phase The multiplication and addition operations in the synchronization phase of ... transition time K in (11) and (13) is obtained from the estimation of K If K = K, then one of the two subblocks contains both / frequencies ω1 and ω2 and the other subblock contains only one frequency ... number of iterations for K = 120 The simulation results indicate that it converges after about two iterations To evaluate performance, the transition time is set to three conditions, K = 56, K...

Ngày tải lên: 21/06/2014, 08:20

... Transactions on Communications, vol 36, no 2, pp 195–204, 1988 L A Rusch and H V Poor, “Narrowband interference suppression in CDMA spread spectrum communications,” IEEE Transactions on Communications, ... Section 5, and the conclusions are summarized in Section In what follows, AT denotes the transpose of A, and AH denotes the Hermitian of A denotes the circular convolution MC-CDMA Communication ... subsection, an adaptive decision-directed channelestimation algorithm in the time domain is developed The conventional channel-estimation methods for multicarrier transmission systems are equipped...

Ngày tải lên: 21/06/2014, 08:20

... BER The one-dimensional (1D) optimization performed in Step for finding λ p speeds up the convergence considerably in comparison to the use of a constant value for λ p The 1D search is done by ... of multiuser detectors in asynchronous channels, ” IEEE Transactions on Communications, vol 38, no 4, pp 497–507, 1990 [3] A J Viterbi, “Very low rate convolution codes for maximum theoretical performance ... vectors that generate the cone compared to the original receiver outside the cone Since 12 EURASIP Journal on Wireless Communications and Networking the Q-function is monotonic decreasing, it is...

Ngày tải lên: 21/06/2014, 22:20

... joint DS-CDMA space -time MUD system with error control coding over a multipath fading channel The authors of [20] use convolutional coding for error control coding and a space -time MMSE detector ... detector at reception propagating through a Rayleigh fading channel We use an MMSE/PIC MUD coupled with STBC to achieve space -time multiuser detection Depending on the concatenation scheme used, ... turbo codes The numerical results are discussed in Section 5, and Section concludes this paper TURBO SPACE -TIME CODED MIMO-CDMA SYSTEM A MIMO-CDMA system that employs turbo codes and space time...

Ngày tải lên: 21/06/2014, 23:20

... if it converges and the condition of convergence is < μ < This will be validated in the simulation section SIMULATION RESULTS To show the important reduction in computational complexity one can ... if the condition KL ≤ 3N is satisfied Moreover, all the aforementioned convergence analysis and conditions of convergence are valid for this case as well, that is, the proposed structure converges ... relaxation (acceleration) since the interval ]0, 1[ corresponds to under relaxation (deceleration) and it is basically used to ensure convergence of the block Gauss-Seidel iteration if it is not convergent...

Ngày tải lên: 22/06/2014, 00:20

... if it converges and the condition of convergence is < μ < This will be validated in the simulation section SIMULATION RESULTS To show the important reduction in computational complexity one can ... if the condition KL ≤ 3N is satisfied Moreover, all the aforementioned convergence analysis and conditions of convergence are valid for this case as well, that is, the proposed structure converges ... relaxation (acceleration) since the interval ]0, 1[ corresponds to under relaxation (deceleration) and it is basically used to ensure convergence of the block Gauss-Seidel iteration if it is not convergent...

Ngày tải lên: 22/06/2014, 06:20

... control for discrete -time nonlinear nonnegative uncertain systems In this section, we consider the problem of characterizing neuroadaptive feedback control laws for discrete -time nonlinear nonnegative ... nonnegative integers The following definition introduces the notion of a nonnegative resp., positive function Definition 2.1 A real function u : Z → Rm is a nonnegative resp., positive function ... of Section to the case where control inputs are constrained to be nonnegative Finally, in Section we draw some conclusions Mathematical preliminaries In this section we introduce notation, several...

Ngày tải lên: 22/06/2014, 11:20

... positions j −1 Position 2( j − 1) + t=1 Lt + contains a j −1 Position 2( j − 1) + t=1 Lt + contains a j −1 Position 2( j − 1) + t=1 Lt + i + contains a −1 j −1 Position 2( j − 1) + t=1 Lt + contains ... formulation in which the decision epoch is chosen as the arrival and departure of each transmission round Based on these decision epoches, the time duration until the next state remains exponentially ... Position 2( j − 1) + t=1 Lt + i + contains a −1 j −1 and position 2( j − 1) + t=1 Lt + i + contains a j −1 Position 2( j − 1) + t=1 Lt + contains a −1 j −1 Position 2( j − 1) + t=1 Lt + L j + contains...

Ngày tải lên: 22/06/2014, 19:20