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Wireless radio relays are one of the possible contenders to extend the capacity and reliability of broadband data channels envisaged for 4G and above. Several research and standardization groups are engaged in evaluating and evolving the range of applications with radio relays. There are both pros and cons of this technology, which needs to be carefully addressed before its actual implementation....
Cooperative communication has been shown as an effective way to exploit spatial diversity to improve the quality of wireless links. The key feature of cooperative transmission is to encourage single-antenna devices to share their antennas cooperatively such that a virtual and distributed antenna array can be constructed, and, as a result, reception reliability can be improved and power consumption...
During recent years Wireless Body Area Networks (WBANs) have been experienced continuous developments by researchers both in academia as well as industry due to its capabilities and various promising applications, for instance, in the areas of healthcare, sports, military, etc. One of the crucial requirements in designing a WBAN, especially, for the healthcare applications is network reliability since...
Clearly, making use of user cooperation transmission technique in a multi-hop wireless network improves its performance in terms of transmission reliability and gives birth to multi-hop wireless relay networks. In this paper, we investigate and evaluate the Bit Error Rate (BER) of multi-hop wireless relay networks employing distributed Space-Time Block Coding (STBC) at many relays' levels. One relays'...
Recently, the network coding in cooperative communications has been categorized into two mainstreams, Digital Network Coding (DNC) and Analog Network Coding (ANC), which we both discuss in the article. First a brief survey of these two sub-branches is given. Then, to the very wireless characteristics fading and interference, DNC and ANC network coding way were proposed respectively, which aims at...
Dual-hop transmission is a technique by which the channel from the source to the destination is split into two possibly shorter links using other nodes. The source transmits signals to the destination via a group of nodes that act as relays. It is an effective technique when the direct link between the source and the destination is in deep fading, severe shadowing, or non-line-of-sight (NLOS) environment...
A relay selection (RS) scheme for two-way networks with multiple amplify-and-forward relays is proposed. The scheme maximizes the worse receive signal-to-noise ratio (SNR) of the two end users. It is proved to coincide with the best-worse RS scheme originally proposed for one-way relay networks. Through rigorous error rate analysis, the scheme is shown to achieve full diversity. For networks with...
In this paper, the optimal power allocation problems are solved for hybrid distributed beamforming in wireless relay networks. The capacity of the source-destination link is maximized and the total transmit power of the source and the relays is minimized. The hybrid relaying which adapts relaying strategies such as amplify-and-forward (AF) and decode-and-forward (DF) to the channel condition can enhance...
By exploiting properties of the wireless medium, network coding may provide even larger throughput increases for wireless networks than possible for wired networks. In particular, simultaneously transmitted signals are seen as noisy linear combinations at the antennas of receivers. It is thus quite tempting to use the physical layer to directly perform network coding "on the air". However,...
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