Synchronization Algorithms for 60 GHz Communication Standards

Abstract

[ES] En los sistemas de comunicación que operan en la banda de los 60 GHz también es necesario asegurar la sincronización en tiempo y frecuencia. Esta tesina analiza y afronta las dificultades que pueden aparecer al implementar un sistema de transmisión basado en este tipo de estándar, particularizando estos estudios al estándar IEEE 802.15.3c-2009.

[EN] The objective of every digital transmission system is to provide the receiver exact copies of the information generated by the source. Synchronization is then a critical function which has to be guaranteed to avoid problematic effects that lead to the degradation of the received signal and an incorrect detection of the originally transmitted symbols. Some of these harmful effects include incorrect sampling and demodulation of the received signal or inter-symbol and inter-carrier interference, among others. In the EU project QStream, digital signal transmission in the 60 GHz frequency band has been addressed. As a part of this project, a demonstrator is being developed to prove that communications at such frequencies is possible. In 60 GHz systems, like in any other digital communications system, it is necessary to achieve both frequency and timing synchronization. For this reason, the implementation of synchronization recovery algorithms is essential. This diploma thesis analyzes the difficulties that can appear when implementing a transmission system based on a 60 GHz standard. Specifically, this thesis will particularize its studies to the IEEE 802.15.3c-2009 standard, since it is very easy to adapt the results to other standards. IEEE 802.15.3c is a revision to the IEEE 802.15.3-2003 standard for high rate Wireless Personal Area Networks (WPAN) which defines alternative physical and MAC layers operating in the millimiter wave, and can reach rates of up to 5 Gb/s. The IEEE 802.15.3c standard specifies different physical layer transmission modes [1]: a) Single Carrier PHY (SC PHY). b) High Speed Interface PHY (HSI PHY). c) Audio/Visual PHY (AV PHY). This document thesis is focused on the study of the synchronization issues for the SC PHY and HSI PHY modes of the IEEE 802.15.3c standard. For the single carrier based SC PHY mode, a number of algorithms that compensate the effect of the symbol timing offset have been tested. On the other hand for the OFDM based HSI PHY mode several algorithms have been implemented to achieve both timing and carrier synchronization recovery.