Variable rate multicarrier schemes over integrated Satellite-terrestrial system

Analysis of Variable Bit Rate WH/CI‐Spread OFDM based Integrated Satellite‐Terrestrial Broadcast System

“…These advantages are in line with the goals of 5G communication systems [11]. In [8], multicarrier spread orthogonal frequency division multiplexing (SOFDM) transmission scheme is discussed, where parallel modulated data is spread by a unique code. The codes may be WH or polyphase CI [12].…”

“…Furthermore, the Abdi channel model parameters, i.e. fading figure ( v ), average power of LOS component () and average multipath power () are adopted from [8]. These parameters are evaluated from Fontan channel model parameters namely, mean () and variance () of lognormal distribution, and average multipath power in dB scale () with respect to LOS component, through the expressions provided in [15].…”

“…These parameters are evaluated from Fontan channel model parameters namely, mean () and variance () of lognormal distribution, and average multipath power in dB scale () with respect to LOS component, through the expressions provided in [15]. Table 1 lists the values of the Fontan model parameters along with the calculated Abdi model parameters for each corresponding channel state [8]. Since, the LMS channel is considered to be narrowband, therefore all the tabulated values in Table 1 are the average values.…”

“…In DVB‐SH‐A, OFDM transmission is applicable at both satellite and terrestrial links, whereas in DVB‐SH‐B time division multiplexing is employed at satellite channel, while preserving OFDM at the terrestrial channel [7]. The architecture, however, does not support VBR broadcast communication or QoS at the physical layer [7], as explained in [8] and in Section 2 (motivation) of this paper. Similar to DVB‐SH system, DVB next generation broadcasting system to handheld (DVB‐NGH) [9] also follows the same methodology to provide VBR services.…”

“…Later, to support multiuser communication multicarrier‐code division multiple access was analysed over the frequency selective channel [14]. In this paper, frequency‐domain code spread technique as described in [8] is adopted in SOFDM scheme. In [15], narrowband time generative LMS channel model is described which finds its existence in DVB‐SH standard.…”