Exploring Faster-than-Nyquist for Satellite Direct Broadcasting

Blind Symbol Rate Estimation of Faster-than-Nyquist Signals Based on Higher-Order Statistics

“…where the transmitted signal is assumed to be nth order cycloergodic so that the expectation in (2) can be replaced by a time average [16]. The chosen blind symbol rate estimator based on [4] first computes (14) for all discrete delay vectors τ taken in T = {−∆τ /2, −∆τ /2 + 1, . .…”

“…The oversampling factor is given by T s /T = 10 and we set T = 1. Furthermore, (14) is implemented with a discrete Fourier transform so that α ∈ F with…”

“…Unfortunately, the additional algorithmic complexity induced has delayed the implementation of FTN systems for several decades. Iterative equalization and decoding techniques [5,19] combined with increasing computational capabilities have renewed the interest in FTN signaling, enabling spectral efficiency gains up to 8-20 % [12,15,14,10,1].…”

SC-OFDM, a Low-Complexity Technique for High Performance Satellite Communications

“…Since these improvements result in significant gains in capacity and flexibility of broadband interactive satellite networks, basically all relevant providers for professional satellite transmit and receive equipment announced their support for the new specification. 5 The second initiative towards the post-DVB-S2 within the DVB group aimed at so called "green-field" satellite technologies 4 opening the way to disruptive technologies going beyond the boundaries of DVB-S2, such as new modulation and coding, new waveforms such as, e.g., faster than Nyquist 4,6 or Single-Carrier Orthogonal Frequency Division Multiplexing (SC-OFDM), new receiving algorithms for joint detection, decoding and equalization, interference mitigation, framing and pilot optimization. These next generation technologies are still under study and evaluation within the group.…”

Faster-than-Nyquist signaling: on linear and non-linear reduced-complexity turbo equalization

“…FTN combined with low-density parity-check codes (LDPC) has been proposed in the framework of DVB-S2X [2], but finally postponed in order to avoid significant changes in the receiver architecture. More recently, spectral efficiency gains up to 8-20 % have been achieved with the help of linear equalization structures which suggest an affordable implementation cost in user terminals [18,13].…”