Abstract
In the traditional layered division multiplexing (LDM) system, by simply adjusting the injection level, the reception performance of the core layer (CL) mobile services will be decreased significantly, resulting in the deterioration of system coverage performance. Thus, it is necessary to improve the performance of the enhanced layer (EL) service reception without affecting the reception threshold of CL service. To achieve this, in this paper, an enhanced LDM (En-LDM) scheme that supports multi-service transmission is proposed for the next-generation broadcasting network. In this scheme, at the transmitter end, part of the low-density parity-check (LDPC) coded data stream of fixed service conveyed in the EL will be extracted out through puncturing, and then, it will be transmitted over the CL of the LDM signal along with the original CL data in a frequency domain multiplexing (FDM) manner. At the receiving end, the punctured data of the EL fixed service will be recovered with a higher signal-to-noise ratio (SNR). Compared to the traditional LDM scheme, the proposed En-LDM scheme can significantly improve the reception performance of fixed services without decreasing the SNR threshold of mobile services. Moreover, the En-LDM can achieve a higher channel capacity than that of the traditional LDM for both the fixed services and the overall services. The superiority of the proposed En-LDM scheme over the traditional LDM scheme is validated by the simulation under the additive white Gaussian noise (AWGN) and fading channels.
Highlights
In recent years, as the types and quantities of handheld portable devices and fixed terrestrial broadcast receiving devices have developed in full swing, people’s needs for multimedia content are becoming increasingly diverse
It can be observed that when the low-density parity-check (LDPC) code rate of the enhanced layer (EL) configuration increases from 9/15 to 11/15, the En-layered division multiplexing (LDM) system improves the bit error rate (BER) performance of the fixed service from 1.7 to 2.2 dB compared to the traditional LDM system
It can be observed that when the injection system demonstrated the significant performance advantage of the enhanced LDM (En-LDM), especially in level is increased from 10 to 15 dB, the signal-to-noise ratio (SNR)
Summary
As the types and quantities of handheld portable devices and fixed terrestrial broadcast receiving devices have developed in full swing, people’s needs for multimedia content are becoming increasingly diverse. Consider a typical application scenario of LDM where there are two differentiated services, namely mobile services and fixed services The former is used for outdoor and portable reception of high-definition signals, which can usually tolerate lower data rates and is carried by the more robust CL; the latter is exploited to transmit ultra-high-definition television signals, which usually require higher data rates and are carried by the lower power EL [21,22,23,24,25]. In order to achieve the same coverage for different services in the LDM system, the requirements for the receiver antenna height correction and gain correction value will be more stringent. The coverage of the EL signal can be enhanced by adjusting the injection level, it will significantly affect the reception performance of CL mobile services.
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