Hossain, Md. Jahangir2024-08-142024-08-1420032003https://hdl.handle.net/1828/18273Hierarchical constellations (known also as embedded, multi-resolution, asymmetrical or nonuniform constellations) are studied for multimedia and multicast transmission over fad­ing channels. Specifically, we propose general design guidelines for multimedia and multi­cast transmission over fading channels using an adaptive hierarchical phase shift key (PSK) constellation. By computer simulation, we have compared our proposed schemes (for both applications) with a classical time division multiplexing (TDM) that employs uniform PSK of the same order as hierarchical PSK. The adaptive hierarchical PSK, generally, outper­forms (in terms of energy) the adaptive uniform PSK in TDM. We also propose a new technique for simultaneous voice and multi-class data transmis­sion over fading channels using adaptive hierarchical M-ary quadrature amplitude mod­ulation (M-QAM). We present closed-form expressions and numerical results for outage probability, achievable spectral efficiency and average bit error rate (BER) for voice and different classes of data transmission over Nakagami-m fading channels. Compared to the schemes employing hybrid binary shift keying (BPSK)/M-ary amplitude modulation (M ­AM) and uniform M-ary quadrature amplitude modulation (M -QAM), the new hierarchical scheme is spectrally more efficient for data transmission. The new scheme provides also as a byproduct a spectrally efficient way of transmitting voice and single class data.70 pagesAvailable to the World Wide WebThesis