Wyner-Ziv video coding has become one of the hottest research topics in the video coding community due to the conceptual, theoretical and functional novelties it brings. Among the many practical architectures already ...
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ISBN:
(纸本)9783540771289
Wyner-Ziv video coding has become one of the hottest research topics in the video coding community due to the conceptual, theoretical and functional novelties it brings. Among the many practical architectures already available, feedback channel-based with channel coding, e.g. ldpc and turbo codes, solutions are rather popular. These solutions rely on decoder motion estimation based on periodic Intra coded key frames, setting the so-called GOP size, very much like in conventional video coding. This paper targets the rate-distortion and complexity performance study of this type of Wyner-Ziv coding solution as a function of the GOP size, considering both LPDC and turbo codes.
In this paper a new method for detection of ldpc coded, GMSK modulated signals will be proposed. Detection technique is based on Laurent decomposition of CPM signal into PAM pulses. At the receiver, the signal is pass...
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ISBN:
(纸本)9781424405169
In this paper a new method for detection of ldpc coded, GMSK modulated signals will be proposed. Detection technique is based on Laurent decomposition of CPM signal into PAM pulses. At the receiver, the signal is passed through a filter matched to a PAM pulse with highest energy. Thereafter to eliminate effect of other pulses, a linear equalizer and a Turbo like equalizer combined with ldpc decoder will be used. The performance of designed receiver is shown that is very close to optimum Maximum Likelihood receiver but its complexity is much smaller.
The expurgated bound is proposed to evaluate good ldpc codes in this paper. To get the expurgated bound for ldpc codes needs to know the weights' distribution of ldpc codes to be evaluated, while the calculation o...
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ISBN:
(纸本)9780780397361
The expurgated bound is proposed to evaluate good ldpc codes in this paper. To get the expurgated bound for ldpc codes needs to know the weights' distribution of ldpc codes to be evaluated, while the calculation of the weights' distribution is NP problem. To solve the problem, an expurgated bound of ldpc codes based on generator matrices is developed Since the weights' distribution is obtained by the tested generator matrix of given ldpc codes, the expurgated bound of the given codes can reflect the BER performance of the codes. Simulations verify the results to be valid.
We examine successive refinement for the Wyner-Ziv problem described in a recent paper by Steinberg and Merhav, where the authors showed that if the side information for all stages is identical, then the jointly Gauss...
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We examine successive refinement for the Wyner-Ziv problem described in a recent paper by Steinberg and Merhav, where the authors showed that if the side information for all stages is identical, then the jointly Gaussian source with squared error distortion measure is successively refinable. We first extend this result to the case where the difference between the source and the side information is Gaussian and independent of the side information. As a byproduct, we give an alternative proof that the Wyner-Ziv problem for these sources has no rate loss-a result that was recently shown by Pradhan et al. through invoking the duality between the Gaussian Wyner-Ziv problem and the Costa problem. We then perform layered Wyner-Ziv code design for this general type of source based on nested scalar quantization, bit-plane coding, and low-density parity check (ldpc) code-based Slepian-Wolf coding (source coding with side information). We show that density evolution can be used to analyze the Slepian-Wolf code performance, provided that certain symmetry conditions, which have been dubbed dual symmetry, are satisfied by the hypothetical channel between the source and the side information. We also show that the dual symmetry condition is indeed satisfied by the hypothetical channel in our Slepian-Wolf coding setup. This justifies the use of density evolution in our ldpc code-based Slepian-Wolf code design for Wyner-Ziv coding. For the jointly Gaussian source, our layered coder performs 1.29 to 3.45 dB from the Wyner-Ziv bound for rates ranging from 0.47 to 4.68 bits per sample. When the side information is Laplacian and the source equals the side information plus an independent Gaussian noise term, our layered coder performs 1.33 to 3.90 dB from the Wyner-Ziv bound for rates ranging from 0.48 to 4.64 bits per sample.
In a mobile communication channel, the multi-user interference is one of the major performance degradation factors, and restoring the signal-to-signal orthogonality among users is the challenging problem. As a solutio...
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ISBN:
(纸本)0780376323
In a mobile communication channel, the multi-user interference is one of the major performance degradation factors, and restoring the signal-to-signal orthogonality among users is the challenging problem. As a solution to the problem, we proposed a method of combining OFDM and CDMA into a coded OFDM-CDMA system. The proposed system is equipped with a multi-user interference suppression capability based on chip-based interference cancellation and adaptive DFE equalization in series with a low-density parity checker. The performance of the proposed system is verified in a reverse-link multipath Rayleigh fading channel using computer simulation. The overall system performance has improved over a single-carrier CDMA in terms of BER vs SNR.
Cílem bakalářské práce Zpracování signálů v systému Flarion bylo prostudovat způsoby zpracování signálu ve fyzické vrstvě a architekturu sítě Flarion....
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Cílem bakalářské práce Zpracování signálů v systému Flarion bylo prostudovat způsoby zpracování signálu ve fyzické vrstvě a architekturu sítě Flarion. Na základě získaných poznatků při studiu fyzické vrstvy bylo za úkolem sestavit v prostředí Matlab model systému a simulace BER v závislosti na poměr vysílaného výkonu a výkonu rušivého signálu. V první části práce je detailní popis fyzické vrstvy Flarionu, probrána je baseband a OFDM modulace, ldpc kódování a frekvenční skákání. V druhém části práce je prostudována architektura sítě, ekvalizace, řízení výkonu, radiových zdrojů, a způsob handoffu. Ve třetí části práce je vytvoření downlink a uplink modelu v Matlab, dále je provedena simulace BER v závislosti na poměr vysílaného výkonu a výkonu rušivého signálu.
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