LEACH Protocol Based On Resource Allocation

Wireless Sensor Networks (WSN), as a hot spot in the current communication field,has changed our life unprecedentedly. Research on algorithm is the major task in WSN.With the higher expectation in QoS, the quantity of data packets to deliver in thenetworks becomes bigger and bigger. The appropriate algorithm that can meet the multi--media application with a large number of data should be designed under considerationof the limited resource in WSN.The thesis focuses on the analysis of LEACH protocol. In LEACH TDMAhierarchy, only in the corresponding timeslot, can the cluster member node send data tothe corresponding cluster head. With a large number of data to send in multimediaapplication, the drawbacks of the TDMA emerge. As a result, a great quantity of thedata packets can not reach the destination node.The thesis introduces the resource allocation method from OFDMA into WSN,aiming the above problem. As a typical FDM technology, OFDMA can improve thechannel capacity by allocating the subcarriers adapt to the proper users. The thesismakes use of Max-Min to design the resource allocation model in WSN. Taking thelimitment of the energy in WSN into account, the transmission speed in the WSNresource allocation is constrained by the transmitting energy consuming factor. By thismodification, the cluster member node can be given the proper subcarriers withlow-energy consumption and better channel gain, and the cluster member node can senddata to the cluster head in the whole steady phase. So throughput between the clusterhead and cluster member nodes is optimized. The theoretical analysis and simulationboth demonstrate that the proposed algorithm in this thesis can improve theperformance of the entire networks.