## Master's Theses

Fall 2015

Thesis

#### Degree Name

Master of Science (MS)

#### Department

Electrical Engineering

Birsen Sirkeci

#### Keywords

cooperative communications, wireless network

#### Subject Areas

Electrical engineering

#### Abstract

In this thesis, the dynamics of the cooperative broadcast in high density 1-dimensional (1D) networks is studied using multiple levels of relays. The benefits of the cooperative broadcast in terms of transmission range and power efficiency are evaluated by approximating the network as a continuum of nodes. Two transmission protocols are studied, the single-shot transmission and the continuous source transmission. In the single-shot transmission, the source node transmits a single message, whereas in the continuous source transmission, it transmits independent messages periodically adding signal interference into the picture. For each case, the analytical expressions for successful broadcasting are presented as a function of source and relay powers, decoding threshold and the noise power.

This study shows that the broadcast behavior highly depends on the path-loss exponent $\gamma$ and the type of transmission, being bidirectional or unidirectional. It is shown that the message can propagate successfully to the entire network for all ranges of $\gamma$ using the cooperative broadcast. Furthermore, the cooperative broadcast is compared with the non-cooperative multi-hop broadcast in terms of power efficiency.

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