On Pilot-Symbol-Assisted Carrier Synchronization for DVB-S2 Systems

Abstract

Abstract-We consider the problem of carrier synchronization in future 2nd-generation satellite digital video broadcasting (DVB-S2) receivers. In this scenario, this task is made harder by the complexity constraints, related to the use of consumer-grade equipment. Making use of the distributed pilot symbols of the DVB-S2 standard, low-complexity techniques for fine frequency estimation and for detection in the presence of a strong phase noise, typical of consumer-grade equipment, will be proposed. The performance of the described algorithms will be analysed in detail through computer simulations.Index Terms-Carrier synchronization, DVB-S2 systems, iterative detection and decoding, phase noise, satellite communications.

Implementation Issues of Cognitive Radio techniques for Ka-band (17.7–19.7 GHz) SatComs

“…If we consider the frame structure of DVB-S2 standard, it employs pilot symbols in its transmission [28]. The knowledge of pilot symbols can be exploited as an additional information in order to sense the FS signal using joint processing.…”

“…Subsequently, based on the remaining signal, a simple ED technique can be applied in order to decide the presence or absence of the FS signal. It should be noted that the sensing should be done during the period of FSS pilot transmission and a proper synchronization is necessary at the satellite terminal [28]. Furthermore, it remains an open challenge to exploit other pilot assisted sense and avoid schemes in the considered coexistence scenario.…”

Signal Detection and Synchronization for Interference Overloaded Satellite Broadcast Reception

“…Interference processing and related synchronization problems for satellite systems have been considered in the recent past especially with focus on two-way multi-access systems, such as DVB-RCS [11] based systems [12] [13], [14]. Also, the pilot symbol based synchronization problem specific to DVB-S2 has been investigated in [15]. In addition to the joint detection problem, the frequency synchronization issue is considered and an iterative joint detection and synchronization method is presented.…”

Communications over phase-noise channels: A tutorial review

“…The role of pilot symbols will be also discussed. , as well as for powerful channel codes to be decoded iteratively, such as turbo codes or lowdensity parity-check (LDPC) codes (see [3][4][5][6][7][8][9][10][11][12] and references therein). In this latter case, which is of interest in this paper, the algorithms for turbo or iterative detection/synchronization and decoding can be classified according to the way detection/synchronization is obtained.A first family of algorithms can be applied to turbo codes and serially concatenated convolutional codes (CCs) but not to LDPC codes (unless an LDPC code is used as outer code in a serial concatenation).…”

“…The resulting algorithms do not require the use of known (pilot) symbols to trigger the iterative detection/decoding process and are, up to now, the most robust in the literature. This latter approach can be also extended to CPMs [9].A second family is composed of algorithms that, on the contrary, leave the decoder unmodified and complement it with a separate detector/synchronizer whose aim is to estimate and compensate for the carrier phase and frequency uncertainties prior to decoding (e.g., see [5,6,10,11]). Hence, they can be used for LDPC codes also.…”