Single-carrier and multi-carrier cooperative diversity techniques for next generation HF communication systems

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When Hurricane Katrina hit the Gulf Coast of United States in 2005, it severely damaged the telecommunications infrastructure isolating the area from outside world. With nearly all the high-end emergency communications gear, 911 call centers, cellphone towers, and fixed phone lines being knocked out by the hurricane in its path, HF (high-frequency) amateur radio systems played a critical role in rescue and recovery operations. Subsequent American congressional hearings highlighted the amateur radio response as one of the few examples of what went right in the disaster relief effort. Such tragic incidents have resulted in re-appreciation of the "good old" HF technology which has been an essential part of worldwide information transmission since the advent of radio. In this high-tech information age, HF communication continues to be used for a wide range of civilian, government, and military applications as a powerful alternative to a myriad of more sophisticated communication systems. HF systems have been traditionally associated with analog voice and very-low-rate data transmission. With the shift from analog to digital in voice communication and increasing demands for high-rate data transmission (e.g., e-mail, internet, FTP), HF communication has been going through a renaissance. Innovative techniques are required to push the capacity limits of HF band. Our research proposal aims to fill the research gap in this area investigating suitable air interface architectures which will be able to support the challenging expectations in next generation HF communication systems.