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Energy consumption issues are the fastest growing research area in wireless communication network. Cooperative relay communication technique is a solution for minimizing the energy of overall wireless communication network. A number of techniques have been proposed to minimize the energy consumption of the network. This paper gives an overview of the different cooperative relay communication networks. [ABSTRACT FROM AUTHOR]

The increase in the demand for bandwidth and different high performance services opened the door for using multiple antennas at transmitter and receiver. The wireless channel properties are dynamic in nature as it is frequency selective and time-dependent. Orthogonal Frequency Division Multiplexing (OFDM) is a popular technique for high data rate wireless transmission. OFDM may be combined with antenna arrays at transmitter and receiver to increase the diversity gain and enhance the system capacity. In this paper, an algorithm is presented for the estimation of sparse Multiple Input Multiple Output (MIMO)-OFDM channel estimation. The most significant taps of sparse channel are obtained by analysis of pilot bits of received signal. Along with this, spatial and temporal correlations of wireless channels are used to improve the channel estimation accuracy and super-resolution estimate of path delays with arbitrary values can be achieved using finite rate of innovation theory. Finite Rate of Innovation (FRI) technique can recover the analog sparse signal with very low sampling rate, and as a result the average pilot overhead per antenna only depends upon the channel sparsity level instead of the channel length. This reduces the pilot overhead. [ABSTRACT FROM AUTHOR]