Orthogonal frequency division multiplexing (OFDM) is widely adopted in not only wireless communication but also wired communication systems as multi-carrier modulation scheme. Although OFDM systems are more robust to frequency selective channels and provide higher spectral efficiency than single carrier systems, OFDM systems are suffered from higher out-of-band (OOB) radiation and the sensitivity of frequency mismatch. To provide relaxed synchronization requirements and small OOB radiation, new multi-carrier modulation schemes have been considered and researched. As alternative to OFDM, filter-bank multi-carrier with offset QAM modulation (FBMC-OQAM) and universal filtered multi-carrier (UFMC) systems are proposed. Although both FBMC-OQAM and UFMC systems are more robust to timing offset (TO) and carrier frequency offset (CFO) effects, synchronization mismatches still lead to performance degradation. Therefore, we are focusing on developing the synchronization algorithms for FBMC-OQAM and UFMC systems to provide reliable system performances. Due to the different system structures of those systems, the conventional synchronization for OFDM cannot be applicable. By employing real training sequences with null subcarriers, we proposed new signal detection, TO and CFO estimation algorithms for FBMC-OQAM systems. Moreover, we proposed the joint TO and CFO estimation along with cell ID detection for UFMC systems. By using proposed synchronization algorithms, we not only reduce the computational cost but also provide better system performance. We also suggested and proposed the uplink system models to support asynchronous multi-user transmission and multi-service communication systems. Finally, we have demonstrated the over-the-air transmission to evaluate the performance of proposed asynchronous multi-user uplink transmissions and multi-service communication systems.
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Signal detection and synchronization for advanced multi-carrier systems
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