AG Kommunikationstheorie


OFDM Synchronization in the Presence of Interference


Spectrum efficiency can be significantly increased by sharing the available frequency band between licensed primary users (PU) and a group of unlicensed secondary users or cognitive radios (CR). Due to its flexibility in allocating resources among CRs, OFDM is shown as a promising candidate for physical (PHY) layer in future CR standard. Due to the mutual interference between PU and CRs, a challenging design task at CR receiver is to find the correct start of the OFDM symbol by means of timing estimation. This thesis investigates existing OFDM timing estimation algorithms in the presence of mutual interference between PU and CRs. Appropriate modifications to timing synchronization are proposed, while the implementation will be conducted in GNU Radio OFDM testbed.

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