Adaptive multi code assignment for a DS CDMA ad hoc network
Adaptive multi code assignment for a DS CDMA ad hoc network
... code assignment protocols for both centralized and distributed Ad Hoc Networks We present analytical and simulation results for the proposed code assignments Keywords: Ad Hoc Network, DS- CDMA, ... Spectrum and Ad Hoc Network 2.2 Code Assignment in Ad Hoc Network 2.2.1 Strategies for Code Assignment DS- CDMA code assignment schemes require that nodes are transmitter, receiver or transmitter-receiver ... to the multi- code assignment problem for a centralized or a small ad hoc network The code assignment algorithm assigns to each transmitter-receiver pair a certain transmission power and a set...
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Báo cáo hóa học: " Computationally Efficient Blind Code Synchronization for Asynchronous DS-CDMA Systems with Adaptive " ppt
... present paper, an adaptive near-far robust synchronization array detector for space-time asynchronous DS-CDMA signals is developed The primary requirement needed for the proposed timing synchronization ... scheme with other timing estimation techniques is also evaluated in Section Finally, concluding remarks are given in Section Computationally Efficient Blind Code Synchronization 685 ASYNCHRONOUS DS-CDMA ... in the above test in (38) for the determination of the information-bearing symbol Thus, the estimate of the information symbol d1 can Computationally Efficient Blind Code Synchronization 689 − be...
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Báo cáo hóa học: " Energy Efficient AODV Routing in CDMA Ad Hoc Networks Using Beamforming" potx
... Traditional AODV with minimum hop routing for CDMA ad hoc mobile networks using omnidirectional antennas (II) Proposed AODV with energy as routing metric for CDMA ad hoc mobile networks using ... (III) Traditional AODV with minimum hop routing for CDMA ad hoc mobile networks using directional antennas (IV) Proposed AODV with energy as routing metric for CDMA ad hoc mobile networks using directional ... outgoing packet according to a preset routing metric Ad hoc on-demand distance vector routing (AODV) is used for ad hoc networks to create routes as they are needed In this paper, AODV routing...
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Báo cáo hóa học: " Adaptive QoS Routing by Cross-Layer Cooperation in Ad Hoc Networks" pptx
... nonadaptive routing strategy QoS Routing by Cross-Layer Cooperation in Ad Hoc Networks [17] L H M K Costa, S Fdida, and O C M B Duarte, “Distancevector QoS- based routing with three metrics,” in ... quality-of-service routing in ad hoc networks,” IEEE J Select Areas Commun., vol 17, no 8, pp 1488–1505, 1999 [4] B Das and V Bharghavan, Routing in ad- hoc networks using minimum connected dominating sets,” in ... paths and QoS constraints In this paper, we propose a cross-layer cooperation mechanism to support adaptive multipath routing with multiple QoS constraints in an ad hoc network The cross-layer...
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Báo cáo hóa học: " Research Article Design and Performance Analysis of an Adaptive Receiver for Multicarrier DS-CDMA" doc
... the performance of the CPIC receiver, and we can see that the APIC outperforms the CPIC for μ ∈ (0, 0.5) Under the same simulation settings, the BER performances of the one- and two-stage APIC receiver ... this paper, we designed an adaptive receiver for the multicarrier DS-CDMA system over Rayleigh fading channels and evaluated the performance of the system A closed form expression of the BER is ... Kondo and B Milstein, Performance of multicarrier DS CDMA systems,” IEEE Transactions on Communications, vol 44, no 2, pp 238–246, 1996 [15] W Xu and L B Milstein, “On the performance of multicarrier...
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Báo cáo hóa học: " A Robust Parametric Technique for Multipath Channel Estimation in the Uplink of a DS-CDMA System" pot
... exploits multipath channel parameters CONCLUSIONS In this paper, a new method for estimating the multipath channel parameters of a single user in the uplink of a DSCDMA system has been proposed The estimation ... way similar to S(τ) based on the already estimated path delays The value of the search step size δ a ects the estimation accuracy of the maximization procedure In any case, the estimates obtained ... received data The deflation scheme applies similarly to the rest of the paths In this paper we propose a new method for estimating the multipath delays and gains in the uplink of a DS-CDMA system...
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Báo cáo hóa học: " Research Article A Joint Optimization Criterion for Blind DS-CDMA Detection" pot
... probability of symbol error for (a) normal (equal power) situation (MAI = dB) and (b) near-far situation (MAI = 10 dB) Parameters of simulation are the same as in Figure 8 EURASIP Journal on Advances ... currently an Associate Professor He teaches undergraduate and graduate courses on digital signal processing of speech signals and mathematical methods for communication On several occasions, he was ... International Journal of Adaptive Control and Signal Processing, vol 18, no 3, pp 225–243, 2004 ´ [18] J Reina, I Dur´ n-D´az, and C Crespo, “Caracterizacion de a ı ´ circuitos para plataforma de...
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Adaptive parallel interference cancellation receivers with diversity combining for multicarrier DS CDMA systems
... bandwidth of MT -CDMA is comparable with that of DS- CDMA scheme Table 2.1 Features of various CDMA systems DS- MC -CDMA MC -DS- CDMA MT -CDMA of N N N Processing gain G G G GN TsN / G TsN TsN CDMA Number ... APIC receivers for synchronous MC -DS- CDMA 5.1 BER Performance of various receivers in Rayleigh fading channel at SNR of 20dB for synchronous MC -DS- CDMA 5.2 BER performance of one-stage PIC receivers ... Adaptive parallel interference cancellation (APIC) receivers are proposed for both synchronous and asynchronous MC -DS- CDMA systems By taking advantage of combining techniques such as maximal ratio combining...
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Báo cáo hóa học: " Research Article Minimum BER Receiver Filters with Block Memory for Uplink DS-CDMA Systems" pdf
... filters with block memory which has the minimum BER versus Eb / N0 performance Figure shows the BER versus Eb / N0 performance for different number of users N of the proposed minimum BER DS-CDMA ... together with the k results from (19), it is seen that (18) can be rewritten as 2.7 BER = = 0, ri = − BER {r0 (z),r1 (z), ,rN −1 (z)} (22) MINIMUM BER RECEIVER FILTER DESIGN WITH BLOCK MEMORY Property ... MMSE DS-CDMA system BER DS-CDMA system Figure 3: BER versus Eb / N0 performances of the MMSE DSCDMA system (· · · ◦ · · · ) and the proposed minimum BER DSCDMA system (− × −) for different number...
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Báo cáo hóa học: " ADAM: A Realistic Implementation for a W-CDMA Smart Antenna" docx
... ADAM: A Realistic Implementation for a W-CDMA Smart Antenna If capabilities of phased array, switched-beam array, and adaptive array antennas are compared, the last type shows considerable advantages ... Partial cancelation Total cancelation NLMS total cancelation NLMS partial cancelation RLS total cancelation RLS partial cancelation Figure 18: Normalized array factor for total and partial cancelation ... Haro, et al., “Modular smart antenna multi-standard for multi-operator cellular communications scenarios,” Patent no P200102780, Spain, 2001 ADAM: A Realistic Implementation for a W-CDMA Smart...
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Báo cáo hóa học: " Timing-Free Blind Multiuser Detection for Multicarrier DS/CDMA Systems with Multiple Antennae" pot
... problem of blind multiuser detection for asynchronous MC DS-CDMA systems equipped with multiple transmit and receive antennae This is nowadays an interesting research topic, since MC modulation formats ... rule, which is optimal for hard-quantized statistics; on the other hand, for nr From now on, we adopt the normalization m = Blind Receivers for Multicarrier DS/CDMA MIMO Systems even, the possibility ... Blind Receivers for Multicarrier DS/CDMA MIMO Systems k b0 (i) 615 r0 (τ) MC mod bk (i) ADC S/P k bnt −1 (i) Rx rnr −1 (τ) MC mod ADC Figure 1: Scheme of a communication system with multiple...
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Sprite: A Simple, Cheat-Proof, Credit-Based System for Mobile Ad-Hoc Networks potx
... [Online] Available: http://gunpowder.stanford.edu/˜laik/projects/adhoc/mitigating.pdf [5] L Buttyan and J P Hubaux, “Enforcing service availability in mobile ad-hoc WANs,” in IEEE/ACM Workshop on Mobile ... unicast case As route-discovery broadcast can be viewed as a special case of multicast, this approach can also be applied to multicast if multicast is not frequently used in the system If multicast ... intermediate node to forward a message, respectively We observe that RSA has a much smaller forwarding overhead Thus, if reducing forwarding overhead is the major objective, RSA is a better implementation...
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Báo cáo hóa học: " Research Article Existence and Stability of Antiperiodic Solution for a Class of Generalized Neural Networks with Impulses and Arbitrary Delays on Time Scales" ppt
... existence and global exponential stability of anti-periodic solutions for a class of generalized neural networks with impulses and arbitrary delays This class of generalized neural networks include many ... Boston, Mass, USA, 2001 a 32 M Bohner and A Peterson, Advances in Dynamic Equations on Time Scales, Birkh¨ user, Boston, Mass, a USA, 2003 33 V Lakshmikantham and A S Vatsala, “Hybrid systems on ... equation on a time scale,” Journal of Mathematical Analysis and Applications, vol 319, no 1, pp 315–325, 2006 35 R Agarwal, M Bohner, and A Peterson, “Inequalities on time scales: a survey,” Mathematical...
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Báo cáo hóa học: " Research Article An Efficient Addressing Scheme and Its Routing Algorithm for a Large-Scale Wireless Sensor Network" pptx
... standard could handle thousands of devices in an Asian metering product [2] N-DIMENSIONAL ADDRESSING SCHEME AND ITS ROUTING ALGORITHM (3, 255) 1023 (2, 5) 517 Figure 5: Tree-based addressing and ... TRAACS algorithm and traditional Cskip based tree-based routing algorithm for ZigBee network The Cskip algorithm assumes two network parameters, Cm and Rm A performance metric used for this evaluation ... Proceedings of IEEE Wireless Communications and Networking Conference (WCNC ’02), vol 1, pp 350–355, Orlando, Fla, USA, March 2002 [9] W R Heinzelman, A Chandrakasan, and H Balakrishnan, “Energy-efficient...
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Báo cáo hóa học: "Research Article A Mobility-Aware Link Enhancement Mechanism for Vehicular Ad Hoc Networks" pot
... break indicator piggybacked in the data packets to find an alternate path to destination D Thus, new arrived data packets can then be delivered via a new path S -A- E-C-D as shown in Figure 2.3 Particle ... is to provide learning and adapting capability in D C H G Primary path Link Alternate path Figure 6: Alternate path construction the traditional fuzzy modeling approach The target objects to ... compute the packet delivery ratio that is used as the performance metric for the PSO algorithm A standard PSO algorithm maintains a swarm of particles that represent the potential solutions to...
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