Personal Video Recorders provide the facility of recording live broadcast streams thus users can replay their recordings whenever they want. However, during playback of those recorded streams, users are isolated from the live content (e.g., latest news,) in which they might be interested. In this paper, we propose an MPEG-2 Transport Stream compatible method which can inform the user about live content that's in user interest area during playback. The method-specific structures, algorithms and an implementation on a Linux platform are presented in the paper. [ABSTRACT FROM AUTHOR]
In this paper we analyze the decoding performance of Raptor codes in Broadcast/Multicast delivery systems. Based on the extensive analysis of the statistics of the behavior of the Raptor codes, we introduce an efficient decoding strategy targeting real time applications on embedded systems. Further, we propose a new efficient incremental decoding algorithm. We show that the proposed algorithm performs up to 42% better than the existing algorithm, when implemented in software on an embedded system platform. We also show that when implemented on a dedicated hardware, the proposed algorithm is 19 times better than its software version in terms of throughput and energy consumption. [ABSTRACT FROM AUTHOR]
In this paper, we suggest a synchronization receiver for MIMO-OFDM based mobile broadcasting system. A MIMO-OFDM receiver with algorithms for tracking of residual frequency offset (RFO) and sampling frequency offset (SFO) is designed and simulated. The proposed synchronization and compensation schemes are applied to IEEE 802.16e WiMAX and its performance is investigated by computer simulations in terms of mean square error (MSE) and bit error rate (BER). The proposed RFO and SFO estimator has a fast convergence and a small residual degradation even for high speed mobile station. [ABSTRACT FROM AUTHOR]
Jun Wang, Zhi-Xing Yang, Chang-Yong Pan, Jian Song, and Lin Yang
Subjects
*ORTHOGONAL frequency division multiplexing, *BROADBAND communication systems, *ALGORITHMS, *DIGITAL communications, *DIGITAL electronics, *BROADCASTING industry
Abstract
PN-sequence padding (PNP) TDS-OFDM transmission scheme has recently been proposed as an appealing alternative to the traditional Cyclic Prefix (CP) OFDM technology as it can provide significant improvement in the spectrum efficiency. In this paper, an iterative method is introduced to subtract the PN sequence. padding for the TDS-OFDM systems to mitigate the residual inter symbol interference (ISI) from the imperfect channel estimation, and the inherent channel estimation techniques are also performed to track the channel changes. Results show that this iterative algorithm can effectively remove the impact from the residual ISI on the slow-fading broadcast channels, even in the presence of very large channel delays in the single-frequency simulcast networks (SFN). [ABSTRACT FROM AUTHOR]