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 tha...

Ngày tải lên: 26/09/2015, 10:59

... 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 Synchr...

Ngày tải lên: 23/06/2014, 01:20

... 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...

Ngày tải lên: 22/06/2014, 22:20

... 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 ne...

Ngày tải lên: 23/06/2014, 00:20

... 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 c...

Ngày tải lên: 22/06/2014, 19:20

... 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...

Ngày tải lên: 22/06/2014, 22:20

... 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 occasi...

Ngày tải lên: 22/06/2014, 23:20

... 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...

Ngày tải lên: 26/09/2015, 11:07

... 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...

Ngày tải lên: 21/06/2014, 22:20

... 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 to...

Ngày tải lên: 23/06/2014, 01:20

... 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...

Ngày tải lên: 23/06/2014, 01:20

... [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 s...

Ngày tải lên: 15/03/2014, 04:20

... 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,...

Ngày tải lên: 21/06/2014, 07:20

... 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 perfo...

Ngày tải lên: 21/06/2014, 23:20

... 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 objec...

Ngày tải lên: 21/06/2014, 23:20