Cooperative Communication System by saraviqar


									GROUP MEMBERS:                                                    SUPERVISIOR
NC SARA VIQAR                                               ASST PROF ZAKA UL MUSTAFA
NC HINA RUBAB                                               Military College of Signals
NC SARA MASOOD                                              National University of Sciences
PC SADIA ZULFIQAR                                           and Technology Pakistan

Real Time Emulation of Cooperative Communication System in Wireless Environment

Cooperative Communication has recently received significant interest as an untapped means for
improving performance of relay transmission systems operating over the ever-challenging
wireless medium. The common theme of most research in this area is to optimize physical layer
performance measures without considering in much detail how cooperation interacts with
higher layers and improve network performance measures. These issues are important for
enabling cooperative communication to practice in real-world networks, especially for mobile
adhoc networks. The use of multiple relays produces multipath fading phenomenon at the
receiver and hence diversity can be used to achieve high output gains. Thus in mobile
environment, routing problem is solved at the physical layer and effects of delay are reduced.
The goal of this project is to analyze basic cooperative communication systems and their
comparison with SISO (Single Input Single Output) Systems. Cooperation in communication
networks results when terminals use their power, time, and bandwidth resources
to mutually enhance their transmissions. The effect of cooperation is twofold: it achieves rate
gains via shorter hops to cooperating neighbors or relays and it increases the spatial diversity
available at the destination. Cooperation also achieves SNR gains that are functions of the inter-
node distances in this range. This means that certain sets of cooperating nodes can achieve the
same diversity at a lower SNR than others.

This communication technique has not yet been implemented in any practical radio networks
anywhere in the world. The project finds its application in wireless sensor networks, MANETS,
and military Combat Networks for battle field communications. The radio networks established
in battle fields or during disaster relief operations are temporary and mobile antennas have
short ranges. When a mobile gets out of the range of the receiver, then it cannot transmit
signals to the receiver. Here is the point where the cooperative communication will come into
play, the outbound mobile station will collaborate with a nearby mobile station to reach the
receiving antenna. Thus the communication can be carried out in more effective manner.
                 Fig1: A mobile receiver in combat network is receiving signals from mobile stations within its range

          Fig2: The outbound mobile station cooperates with an inbound mobile station to transmit signals to the receiver

Fig3: Military network established in battle field

The implementation of this project will be done using three standard PCs with one DSP
processor (DSP board C6713) each. A basic three node relay network will be created with one
DSP board serving as a transmitter second as relay and third as a receiver. All of the
processing will be done in the DSP kit except the processing of output results and loading of
required files which are done by computer processor. In depth analysis of the results will be
done on the basis of BER, SNR and transmission power of the network.

Our project will include three steps:

      MATLAB Simulations of different cooperative communication techniques like Amplify-
       and-Forward and Detect-and-Forward and their performance Comparison
      Real-Time Implementation on DSP kits using Wired Links
      Real-Time Emulation of Wireless Environment using standard PCs on LAN and DSP kits

If Microwave Front-End becomes available then Real-Time emulation of Wireless environment
can be achieved via true radio communication antennas instead of using the LAN PCs.

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