Research on OTFS Modulation Applied in LTE-based 5G Terrestrial Broadcast.

With the evolution of FeMBMS technology and the definition of new numerologies in 3GPP from Release 14 until now, physical performance of LTE-based terrestrial broadcast has been improved, such as larger geographic area with longer CP (Cyclic prefix) of 200μs or even 300μs applied for HPHT (High Power High Tower) compared with traditional unicast with CP of 16.67μs, however as for the limitation of OFDM modulation adopted in FeMBMS in high Doppler scenarios, it has to define another kind of numerology with larger sub-carrier spacing (CP of 100μs) to be published in R16 to support the mobility speed of 250km/h. It is not possible to support large area and high mobility speed in only one numerology at the current technological regime. OTFS (Orthogonal Time Frequency Space) modulation is famous for its performance in resisting high Doppler, this paper builds the bridge between OTFS and LTE-based terrestrial broadcast, and does research on OTFS modulation under the parameters of LTE-based terrestrial broadcast, including as follows. First, briefly introduces the background and development of OTFS modulation and its advantage over other traditional modulation. Basic principle and the signal processing flow of OTFS modulation is described in section II and section III. In the fourth part, this paper gives the development requirements of 5G broadcasting, furthermore, generates the simulation about OTFS system under the numerologies of LTE-based terrestrial broadcast published in R14, compared with OFDM performance individually in CAS and MBSFN mode. Simulation results and conclusions are given in section V.