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|Title:||Analysis of Multicarrier Schemes for Integrated and Hybrid Satellite-Terrestrial Broadcast System|
|Abstract:||Digital Video Broadcasting (DVB) technology is globally acknowledged for broadcasting of Variable Bit Rate (VBR) multimedia (audio, video and data) signals through satellite, cable and terrestrial network. According to the DVB specifications of these standards, VBR services are not supported at the physical layer, i.e., through the wireless channel. In the thesis, OFDM-CDM and FBMC-CDM based transmission schemes are studied and analysed to support reliable transmission of VBR services at the physical layer of Digital Video Broadcast Satellite Handheld (DVB-SH)-A architecture. DVB-SH-A supports the combination of satellite and terrestrial network in integrated or hybrid form, to provide ubiquitous VBR services. Furthermore, as per DVB-SH standard the satellite induced doppler shift and phase noise are the detrimental impairments that affect the end-to-end system performance. For this purpose, the exact closed-form Signal-to-Noise-Interference-Ratio (SINR) expressions are derived to evaluate the effects of Carrier Frequency Offset (CFO) and Phase Noise (PHN) on multicarrier schemes namely Spread Orthogonal Frequency Division Multiplexing (SOFDM) and novel Spread Filterbank Multicarrier (SFBMC) over Integrated Satellite-Terrestrial Broadcast system (ISTBS). Walsh Hadamard (WH) and Carrier Interferometry (CI) based VBR SOFDM, and WH based VBR SFBMC is analyzed over ISTBS. Further, error performance and spectral efficiency analyses are conducted based on the obtained SINR expressions, in existence of 3-state Fontan Land Mobile Satellite (LMS) suburban environment for VBR SOFDM and SFBMC. Also, Typical Urban 6-path (TU6) and Rural Area 6-path (RA6) terrestrial channel models are also considered for the analyses of VBR SOFDM based ISTBS. Similarly, VBR WH-SOFDM is analysed in Hybrid Satellite-Terrestrial Broadcast system (HSTBS) employing Adaptive Decode Forward (ADF) strategy at multiple terrestrial relays, and 3-state Fontan and TU6 channel models. At the receiver, linear Minimum Mean Squared Error (MMSE) equalizer is applied and pilot channel estimation is carried out for the considered multicarrier schemes. In ISTBS, the results illustrate that VBR WH-SOFDM outperforms VBR WH-SFBMC, and conventional OFDM and Perfect Reconstruction (PR)-FBMC schemes significantly in terms of error performance and spectral efficiency. In HSTBS with multiple terrestrial relays, the performance of singlerelay and threerelay VBR WH-SOFDM exhibit an identical performance for the joint effect of CFO and PHN. Nevertheless, the performance improvement in comparison to single relay system is evident in existence of the effect of only doppler frequency shift. From the results, it is also apparent that for high data rate transmission the error performance of WH-SOFDM in integrated system outperforms its counterpart in hybrid system significantly in presence of the joint effect of CFO and PHN. For both ISTBS and HSTBS, simulation and analytic results are in close approximation. Later, it is shown that the complexity of SOFDM and SFBMC systems are rate-dependent, and SOFDM being relatively more complex for higher data rates. Also, the complexity of SOFDM system in HSTBS increases proportionally with the number of terrestrial relays. Hence, a trade-off exists between the achieved error performance and system complexity. Therefore, WH-SOFDM based ISTBS is an appropriate preference for DVB broadcasting, considering the error performance and computational complexity.|
|Appears in Collections:||03. EE|
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