Performance studies and receiver design of a MB-OFDM UWB system

Abstract

A Multi-bands Orthogonal Division Multiplexing (MB-OFDM) Ultra Wide-band (UWB) system has been proposed for the IEEE 802.15 Wireless Personal Area Networks. The MB-OFDM UWB system is extremely sensitive to the frequency offset between transmitter and receiver. A normalized frequency offset of 40 ppm can results in the total breakdown of the transmission link. In this thesis, we proposed a novel frequency offset estimation and compensation algorithm for the system, which compared favorably to conventional estimation algorithms in terms of performance and computation complexity, and limits the performance degradation due to frequency offset to within 1 dB. Moreover, a complete receiver design with channel estimation, synchronization and frequency offset compensation algorithms is detailed. Also, performance studies of high rate MB-OFDM UWB system employing low-density parity-checks code and using a direct spreading with chip interleaving scheme is carried out. Both modifications have been proven through simulations to improve the system performance considerably.