We investigate a cooperative communications scheme with N parallel relays, where both the transmissions from the source to the relays and from the relays to the destination use fountain codes. Receiver for codes can accumulate mutual information, while traditional energy collection methods, such as repetition or cooperative space-time codes, only accumulate energy. As a consequence, using fountain codes can reduce the total energy required for transmitting data from the source to the destination. We first analyze the scenario where the source stops transmitting and the relay nodes start transmitting after L relay nodes have successfully decoded the source data. We optimize L, and also give closed-form equations for the energy savings that can be achieved by the use of mutual-information-collection at the receiver instead of the traditional energy-collection methods. We then analyze an alternate scenario where each relay node starts its transmission to the destination as soon as it has decoded the source data, and helps the other relay nodes that are still in reception mode. Doing so further reduces the total transmission time and energy consumption.
|Title of host publication||[Host publication title missing]|
|Publisher||IEEE - Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||6|
|Publication status||Published - 2006|
|Event||IEEE Global Telecommunications Conference, 2006 - San Francisco, CA, United States|
Duration: 2006 Nov 27 → 2006 Dec 1
|Conference||IEEE Global Telecommunications Conference, 2006|
|Abbreviated title||GLOBECOM '06|
|City||San Francisco, CA|
|Period||2006/11/27 → 2006/12/01|
Bibliographical noteThe information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Department of Electroscience (011041000)
Subject classification (UKÄ)
- Electrical Engineering, Electronic Engineering, Information Engineering