New SemiBlind Channel Estimation for LDMLSI Local content insertion and viewer segmentation with proximity service information is a critical business case for broadcasting operators. This personalized service delivery will open up an opportunity for new use cases, such as local service delivery, local advertisement insertion and local emergency warning. In practice, single frequency networks (SFNs) offer a better spectrum efficiency when compared with traditional Multiple Frequency Network (MFN) approaches. Nevertheless, the addition of local content delivery can dramatically reduce that efficiency. Recently, the Layered Division Multiplexing (LDM) based Local Service Insertion (LSI) solution has been proposed as an interesting alternative for including local content in single frequency networks. Nonetheless, the required channel estimation procedure has been considered a major drawback for its successful implementation. In this work, a new semiblind channel estimation algorithm is proposed. The algorithm takes advantage of the LDM structure and it is based on the statistical properties of the time domain Orthogonal Frequency Division Multiplexing (OFDM) frame. It proposes a solution for the major challenges that have remain unsolved so far. The paper also includes the first simulation results for this new approach.

Using LayeredDivisionMultiplexing to Achieve Enhanced Spectral Efficiency in 5GMBMS 3GPP is pursuing a multimedia broadcast multicast service subsystem in 5G (5GMBMS) based on the latest LTE further evolved MBMS (feMBMS) system in Rel. 14. In this paper, Layered Division Multiplexing (LDM) is proposed as a new addition to the 5G technology toolbox for achieving significantly enhanced spectral efficiency for the 5GMBMS to efficiently deliver mixed broadcast and unicast services. A capacity analysis is first conducted to derive the capabilities of an LDMbased 5GMBMS system to deliver broadcast and unicast services in the different signal layers, under the conditions with severe cochannel interference (CCI). It is shown that using LDM can provide a nearly fullcapacity unicast network on top of highquality broadcast network. The broadcast capacity is mainly determined by the power allocations between the two signal layers. The unicast capacity can be maximized by deliberately operating the system in a CCIlimited mode. Simulation results are presented to demonstrate the capacity gain that can be achieved by incorporating LDM in the 5GMBMS system. This study shows that LDM is one of the enabling technologies to close the gap between the LTE feMBMS capability and the 5GMBMS requirements.