Logical Superposition Coded Video Multicast/Broadcast

Joint source and channel coding (JSCC) has been widely reported for its superb capability in mitigating the legacy channel/user diversity problem in the wireless multicast/broadcast scenario, where the successively refined source information is manipulatively mapped with superimposed channel symbols via superposition coding (SPC). However, the use of SPC involves additional hardware in the physical layer, which may not be in compliance with most standard equipments and protocols. This paper introduces a novel framework of logical SPC (L-SPC) modulation for multicast/broadcast of successively refined sources via the JSCC approach. The framework is characterized by completely software-based L-SPC modulation at the sender, where the modulated signal is generated by mapping successively refined information bits onto a single signal constellation. At the receiving end, the proposed framework only needs simple modifications in the medium access control layer software, while the required demodulation schemes are completely compatible with the standard ones with uniform constellation. Generalized formulations on symbol error rate (SER) are derived for performance evaluation and comparisons with the conventional hardware-based approach for both the 2- and 3-layer cases.


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  • Accession Number: 01629597
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 21 2017 9:14AM