Radio/PHY/MAC development (PACWOMAN Sub project 1)

  • Kovács, Istvan (Projektdeltager)
  • Wijting, Carl Simon (Projektdeltager)
  • Liu, Yaoda (Projektdeltager)
  • Gavrilovska, Liljana Milan (Projektdeltager)
  • Metin, Efrayim (Projektdeltager)



Radio/PHY/MAC development (PACWOMAN Sub project 1) The Ultra Wide-band (UWB) technology is a strong candidate for the envisaged scalable applications using low-power, low-cost, small user terminals/ devices. In the scope of this work, at the PHY and MAC layers, the main innovation resides in the application of UWB technologies for low data-rate applications (i.e. a few bps to 10 Kbps). In the impulse radio based UWB solution, short pulses (in order of some nano-seconds) are generated and directly applied to the antenna. This direct modulation eliminates the need for IF and RF filters and amplifiers, reducing the cost significantly. In these UWB systems different parameters can be changed easily (the processing gain, the delay between pulses, the pulse width) and lead to rather different bit rates. Hence, the scalability is inherent to UWB, as well as the low power operation. Moreover, UWB is also an efficient localisation technology, which, combined with location aware L2 and L3 algorithms, further minimise the overall power budget. The generation, transmission/radiation and reception/demodulation of the UWB signals is one of the main challenges when implementing the communication systems. CPK is conducting research related to the UWB PHY layer in terms of radio propagation investigations and channel characterisation for typical WPAN end-user scenarios. For a complete UWB radio channel description, factors such as antenna characteristics, terminal mobility and user proximity are analysed and their influence on the system performance is being investigated Within the project also Medium Access Control (MAC) is investigated, at the moment there are two types of links that is focussed on, namely the links within the Virtual Devices and the links between Masters and Advanced Terminals. For the links within the Virtual Devices UWB is considered the most suitable PHY layer and mechanisms are being developed to provide ad-hoc connectivity within these systems (e.g. service discovery, network identification). For the other links mainly extension of the CSMA protocols are considered to be able to offer Quality of Service and to reduce the probability of collision and thus improve the power-efficiency. (Carl Wijting, Yaoda Liu, Istvan Kovacs, Liljana Gavrilovska, Efrayim Metin)
Effektiv start/slut dato31/12/200431/12/2004