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Zero-pad
"... log etc. magnitude Fig. 2. Summary or the McAulav Ouaticri analysis procedure. The input signal is segmented into overlapping unn lvxis blocks. or 'fru mcs ' The log-magnitude spectrum ofeach block is computed. and the location and height or spectral peaks arc identified. musical sounds, M ..."
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into windowed. overlapping time segments or 'frames', For each frame (zero-padded by a factor of two or more) we compute the complex spectrum and the log-magnitude spectrum. from which all spectral peaks are identified, The model assumes that each spectral
Optimality of Single-Carrier Zero-Padded Block Transmissions
- Proc. of Wireless Communications and Networking Conf
, 2002
"... We consider the class of linear precoded (LP) orthogonal frequency division multiplexing (OFDM) systems. We first show that single-carrier zero-padded transmissions, termed ZP-only, can be viewed as a special case of LP-OFDM. By resorting to the pair-wise error probability analysis, we establish the ..."
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Cited by 7 (1 self)
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We consider the class of linear precoded (LP) orthogonal frequency division multiplexing (OFDM) systems. We first show that single-carrier zero-padded transmissions, termed ZP-only, can be viewed as a special case of LP-OFDM. By resorting to the pair-wise error probability analysis, we establish
Iterative Demapping for OFDM with Zero-Padding or Cyclic Prefix
- Proceedings of the IEEE International Conference on Communica- tions (ICC
, 2004
"... Abstract — In this paper, we extend the iterative demapping technique, also known as turbo demodulation, to OFDM. We first introduce an inner code which serves to remove the error floor, which is present in current iterative demapping schemes. This technique is then applied to OFDM with cyclic prefi ..."
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Cited by 6 (2 self)
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prefix or zero-padding. Using the EXIT chart, we illustrate the performance differences of various mappings and design a low-complexity inner coding scheme based on differential encoding with code doping. It is shown that this scheme removes the error floor without altering the code rate and while adding
Reduced Complexity Equalizers For Zero-Padded Ofdm
- In IEEE International Conference on Acoustics, Speech, and Signal Processing
, 2000
"... The widespread application of OFDM for local area mobile wireless broadband systems is strongly motivated by the simple equalization it affords. OFDM's bottleneck of channel-dependent performance was only recently addressed by replacing the cyclic prefix (CP) with trailing zeros (TZ). Such zero ..."
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). Such zero-padded OFDM transmissions enable FIR channel-irrespective symbol recovery which results in significant BER gains. The price paid is increased receiver complexity compared to the classical CP-OFDM. To reduce complexity, this paper proposes two novel equalizers for TZ-OFDM. One is based
Blind Channel Shortening for Zero-Padded OFDM
"... Abstract—When the channel delay spread is larger than the guard interval of zero-padded (ZP) OFDM transmissions, interblock interference (IBI) might lead to significant performance degradation. Without altering the signal design, a time-domain equalizer (TEQ) can be applied at the receiver to shorte ..."
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Abstract—When the channel delay spread is larger than the guard interval of zero-padded (ZP) OFDM transmissions, interblock interference (IBI) might lead to significant performance degradation. Without altering the signal design, a time-domain equalizer (TEQ) can be applied at the receiver
Analysis of Different Colour Image Enhancement Techniques Using Interpolation and Super Resolution Methods
"... Abstract- The objective of image processing is to get better resolution for further processing. Several enhancement techniques are proposed for colour image enhancement among these interpolation methods and wavelets are most popularly used. In this paper different colour images are enhanced by using ..."
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by using different methods. The Proposed method is compared with existing methods like Bicubic interpolation method, Wavelet zero padding method with respect to PSNR and it has shown that the proposed technique method gives better performance than the existing methods. Index Terms- Bicubic interpolation
Image registration methods: a survey
- IMAGE AND VISION COMPUTING
, 2003
"... This paper aims to present a review of recent as well as classic image registration methods. Image registration is the process of overlaying images (two or more) of the same scene taken at different times, from different viewpoints, and/or by different sensors. The registration geometrically align t ..."
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Cited by 734 (9 self)
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This paper aims to present a review of recent as well as classic image registration methods. Image registration is the process of overlaying images (two or more) of the same scene taken at different times, from different viewpoints, and/or by different sensors. The registration geometrically align
Large margin methods for structured and interdependent output variables
- JOURNAL OF MACHINE LEARNING RESEARCH
, 2005
"... Learning general functional dependencies between arbitrary input and output spaces is one of the key challenges in computational intelligence. While recent progress in machine learning has mainly focused on designing flexible and powerful input representations, this paper addresses the complementary ..."
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Cited by 612 (12 self)
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that solves the optimization problem in polynomial time for a large class of problems. The proposed method has important applications in areas such as computational biology, natural language processing, information retrieval/extraction, and optical character recognition. Experiments from various domains
The JPEG still picture compression standard
- Communications of the ACM
, 1991
"... This paper is a revised version of an article by the same title and author which appeared in the April 1991 issue of Communications of the ACM. For the past few years, a joint ISO/CCITT committee known as JPEG (Joint Photographic Experts Group) has been working to establish the first international c ..."
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Cited by 1128 (0 self)
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compression standard for continuous-tone still images, both grayscale and color. JPEG’s proposed standard aims to be generic, to support a wide variety of applications for continuous-tone images. To meet the differing needs of many applications, the JPEG standard includes two basic compression methods, each
Results 1 - 10
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104,329