072712-S.Satish.rar - In Analog systems, the chief objective is the fidelity of reproduction of waveforms, hence, the suitable performance criterion is the output signal to noise ratio. The choice of this criterion stems from the fact that the signal to noise is related to ability of the listener to interpret a message. Matched filter is the optimum linear filter that maximizes the output signal to noise ratio. The Matched filter is optimum in the sense that it maximizes the signal amplitude to rms noise ratio at the decision-making instant. Although it is reasonable to assume that maximization of this signal to noise ratio will minimize the detection error probability, we have not proved that threshold detection is the optimum method from the detection error point of view. It will be shown that when the channel noise is white Gaussian, the matched filter receiver is indeed the optimum receiver that minimizes the detection error probability.,2012-03-14 19:25:32,下载18次
pcma-(1).rar - DECISION DIRECTED AND CONSTANT
MODULUS ALGORITHMS DERIVED AND
EVALUATED FOR MULTICARRIER
SYSTEMS,2012-03-14 18:30:01,下载11次
ESTIMATING-THE-ERGODIC-CAPACITY.rar - Data aggregation is essential that exploits correlated sensing data and aggregates at intermediate nodes to reduce the number of messages and to improve the energy efficiency in wireless sensor networks. This project considers the problem of constructing data aggregation tree in a wireless sensor network for a group of source nodes to send sensory data to a single sink node. We propose an ant colony algorithm for data aggregation in wireless sensor networks. Simulation results have shown that our algorithm can reduce significant energy costs. ,2012-03-14 18:27:05,下载84次
POWER-CONTROL-ALGORITHM.rar - A closed-loop power control system
having both fixed-step and adaptive-step power
control algorithms and incorporating with
multitap RAKE receivers was proposed.
Simulations were performed for wide-band radio
channels having path loss, slow fading, and fast
fading. As the measurement of the received power
and the bit energy-to-interfkrence power spectral
density ratio play an important role in a CDMA
power control system, a scheme to estimate these
two parameters was proposed. For a Rayleigh
fading channel and a Rician fading channel
having a K factor of 6dB, a three-tap RAKE
receiver is desirable.,2012-03-14 18:22:55,下载40次
COPERATIVE-COMMUNICATIONS.rar - The channel is modeled by adding the Gaussian noise and Rayleigh Fading. Different combining methods and relaying protocols are studied and compared in this project. We analyzed performance characterizations in terms of The Bit Error Rate and the Throughput. The relaying protocols considered are Amplify & Forward and Detect & forward out of which the Amplify and Forward showed better performance. Among the combining schemes, the Maximal Ratio Combining scheme showed better Bit Error Rate and Throughput curves. The network was also extended to a four node communication system with two relays which act as the distributed antennas. Thus using the distributed antennas we can provide the space diversity without need for physical arrays.
Index Terms: Cooperative Diversity, Fading channels, combining techniques,
transmission protocols, Relay channel, Bit error rate, Throughput, Amplify and forward, Detect and Forward.
,2012-03-14 18:19:43,下载354次