High Performance Faster-than-Nyquist Signaling

In a wireless broadband context, multi-path dispersive channels can severely affect data communication of Mobile Terminals (MTs) uplink. Single Carrier with Frequency-Domain Equalization (SC-FDE) has been proposed to deal with highly dispersive channels for the uplink of broadband wireless systems. However, current systems rely on older assumptions of the Nyquist theorem and assume that a system needs a minimum bandwidth 2W per MT. Faster-Than-Nyquist (FTN) assumes that it is possible to employ a bandwidth as low as 0.802 of the original Nyquist bandwidth with minimum loss despite this, the current literature has only proposed complex receivers for a simple characterization of the wireless channel. Furthermore, the uplink of SC-FDE can be severely affected by a deep-fade and or poor channel conditions; to cope with such difficulties Diversity Combining (DC) Hybrid ARQ (H-ARQ) is a viable technique, since it combines the several packet copies sent by a MT to create reliable packet symbols at the receiver. In this thesis we consider the use of FTN signaling for the uplink of broadband wireless systems employing SC-FDE based on the Iterative Block with Decision Feedback Equalization (IB-DFE) receiver with a simple scheduled access Hybrid Automatic Repeat reQuest (H-ARQ) specially designed taking into account the characteristics of FTN signals. This approach achieves a better performance than Nyquist signaling by taking advantage of the additional bandwidth employed of a root-raised cosine pulse for additional diversity. Alongside a Packet Error Rate (PER) analytical model, simulation results show that