Cooperative diversity is a technique in which various radio terminals relay signals for each other. Cooperative diversity results when cooperative communications is used primarily to leverage the spatial diversity available among distributed radios. In this paper different cooperative diversity schemes and their applications in various wireless networks are discussed. In this paper the impact o...

A robust way to combat multipath fading phenomena in wireless communications is to implement diversity techniques. Diversity is achieved by providing the receivers multiple independent replicas of the same information-bearing symbols through space, time, or frequency. Recently, a new type of diversity, so-called cooperative diversity, has been proposed in order to provide diversity when the wir...

A wireless communication network is rich in interference and noise which makes the communication in the network unreliable. There has been many active research on cooperative communication which helps in improving the reliability of wireless network. To enhance the spectral and power efficiency, lifetime of the network, and reduce outage probability, cooperative communications with relaying nod...

A Wireless Ad-hoc network is an autonomous and self-organizing network without any centralized controller. Cooperative communication is a technique used to increase the reliability and the quality of service (QoS), coverage area range. Space time coding and spatial diversity schemes enhances the performance of the wireless networks. Such networks can be used in military communications and have ...

In this paper, a new scheme of combining cooperative diversity with network coding is proposed for wireless uplink multi-source multi-relay networks. The existing network-coded cooperative scheme always conducts network coding operation at relays in moderate-to-high signal-to-noise ratio region. Distinct from it, the proposed scheme determines either a direct cooperative mode or a network-coded...

Cooperative MIMO network, which consists of multiple relay nodes equipped with a single antenna, is introduced in this paper. Virtual MIMO is examined with multi-relay cooperative communication. Performances of Distributed Space-Time Block Code (DSTBC) in cooperative MIMO are analyzed and compared with general cooperative diversity protocols. Diversity multiplexing tradeoff (DMT), outage probab...

We propose here an analytical framework to quantify the impact of cooperative diversity on the energy consumption and lifetime of sensor networks. It is well accepted that cooperative diversity increases energy efficiency in fading environments. However, previous works have not analyzed, from a theoretical perspective, these benefits in a network setting. This paper presents a theoretical frame...

Cooperative diversity technique is used for achieving high data rate and low BER with low transmit power. The paper proposes a new scheme for selection of first relay having SNR above a predefined threshold level in cooperative diversity network, based on geometric distribution. Closed form expression for outage probability is derived for independent and identically distributed channels with de...

Cooperative communications have the ability to induce spatial diversity, increase channel capacity, and attain broader cell coverage with single-antenna terminals. This thesis focuses on the performance study of both unidirectional and bidirectional cooperative diversity networks employing the decode-and-forward (DF) protocol. For the unidirectional cooperative diversity network, we study the a...