METHODS AND APPARATUS FOR FASTER THAN NYQUIST RATE MULTI-CARRIER MODULATION

摘要

The disclosure pertains to methods and apparatus for Faster than Nyquist (FTN) modulation schemes to increase throughput in multicarrier communication systems and wherein the latency problem inherent in filter bank multicarrier systems (FBMC) is reduced or eliminated by using non-orthogonal waveforms (i.e., faster than Nyquist modulation) in only part(s) of the subframe or packet and orthogonal waveforms in other part(s). The number and spacing between FTN pulses may be selected such that the last sample of the last pulse is received within the time slot allocated to the subframe/ packet, thereby eliminating added latency. The FTN modulation scheme may be employed both temporally and in frequency (e.g., the frequency spacing of the channels may be tighter than the Nyquist frequency spacing condition. FTN signaling also may be used as a method to control/coordinate interference between different nodes. For instance, if a node uses FTN, more pulses may be packed into a given period in the time domain and/or more channels may be packed into a given bandwidth in the frequency domain, hence some parts of the band may be vacated for use by others, use by the same node for additional channels, or used with reduced power. The interference control/coordination may be extended to time and frequency. Such FTN schemes may be used with different types of multicarrier systems.