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error-detection
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Total 67 records
A robust CFAR detection with ML estimation
, Article 2008 IEEE Radar Conference, RADAR 2008, Rome, 26 May 2008 through 30 May 2008 ; December , 2008 ; 9781424415397 (ISBN) ; Taban, M. R ; Norouzi, Y ; Sadeghi, M. T ; Sharif University of Technology
2008
Abstract
Any clutter edge in the reference window of a radar CFAR detection, produces an error in the clutter power estimation which reduces the detectability of the cell under test (CUT). In processors such as OS-CFAR, the designers have attempted to improve the detection performance, nevertheless, none of these processors applies an intelligent method of clutter edge recognition and destroyer data elimination. Therefore any of these processors are effective in some especial cases of nonhomogeneous environment, but are deficient in other cases. In this paper an intelligent method is proposed for clutter edge recognition. This method determines the borders in which the clutter statistics are changing...
A power-efficient clock and data recovery circuit in 0.18 μm CMOS technology for multi-channel short-haul optical data communication
, Article IEEE Journal of Solid-State Circuits ; Volume 42, Issue 10 , 2007 , Pages 2235-2244 ; 00189200 (ISSN) ; Muller, P ; Leblebici, Y ; Sharif University of Technology
2007
Abstract
This paper studies the specifications of gated-oscillator-based clock and data recovery circuits (GO CDRs) designed for short haul optical data communication systems. Jitter tolerance (JTOL) and frequency tolerance (FTOL) are analyzed and modeled as two main design parameters for the proposed topology to explore the main tradeoffs in design of low-power GO CDRs. Based on this approach, a top-down design methodology is presented to implement a low-power CDR unit while the JTOL and FTOL requirements of the system are simultaneously satisfied. Using standard digital 0.18 μm CMOS technology, an 8-channel CDR system has been realized consuming 4.2 mW/Gb/s/channel and occupying a silicon area of...
Transient error detection in embedded systems using reconfigurable components
, Article Industrial Embedded Systems - IES'2006, Antibes Juan-Les-Pins, 18 October 2006 through 20 October 2006 ; 2006 ; 142440777X (ISBN); 9781424407774 (ISBN) ; Fazeli, M ; Miremadi, S. G ; Sharif University of Technology
2006
Abstract
In this paper, a hardware control flow checking technique is presented and evaluated. This technique uses reconfigurable of the shelf FPGA in order to concurrently check the execution flow of the target micro processor. The technique assigns signatures to the main program in the compile time and verifies the signatures using a FPGA as a watchdog processor to detect possible violation caused by the transient faults. The main characteristic of this technique is its ability to be applied to any kind of processor architecture and platforms. The low imposed hardware and performance overhead by this technique makes it suitable for those applications in which cost is a major concern, such as...
Embedded SI partial transmit sequence with improved bit error rate
, Article 2nd International Conference on Electrical Engineering, ICEE, Lahore, 25 March 2008 through 26 March 2008 ; 2008 ; 9781424422937 (ISBN) ; Ahmadian Attari, M ; Reisi, N
2008
Abstract
OFDM is a multicarrier modulation scheme with high bandwidth efficiency and robustness to multipath environment used in high data rate transmission. However, a drawback of this system is the large Peak-to-Average-Power Ratio (PAR) of the transmit signal which makes its straightforward implementation quite costly. PAR in an OFDM based system can be reduced significantly by PTS method for which data recovery requires side information (SI) about the phases used at transmitter. Sending SI, not only reduces the rate, but also increases BER, for any error in SI detection can damage a large amount of transmitted information. By introducing a new phase set, we propose a PTS based method for MPSK...
Exact symbol and bit error probabilities of linearly modulated signals with maximum ratio combining diversity in frequency non-selective Rician and Rayleigh fading channels
, Article IET Communications ; Volume 5, Issue 1 , January , 2011 , Pages 12-26 ; 17518628 (ISSN) ; Sharif University of Technology
2011
Abstract
The exact symbol and bit error probabilities of linearly modulated signals in frequency non-selective Rician fading channels with Lth diversity branches are derived, where coherent detection with maximum ratio combining (MRC) is used at the receiver. For performance evaluation, the multiplicative distortion is combined with the additive Gaussian noise and form an additive noise is formed. This method allows computing the exact symbol and bit error probabilities of M-ary phase shift keying (M-PSK), M-ary quadrature amplitude modulation (M-QAM), M-ary amplitude modulation (M-AM) and M-ary amplitude modulation phase modulation (M-AMPM) for any arbitrary bit mappings. The results contain several...
Clipping noise cancellation in uplink MC-CDMA system using signal reconstruction from non-uniform samples
, Article 2008 International Conference on Telecommunications, ICT, St. Petersburg, 16 June 2008 through 19 June 2008 ; 2008 ; 9781424420360 (ISBN) ; Azmi, P ; Marvasti, F ; Sharif University of Technology
2008
Abstract
In this paper, an iterative signal reconstruction method is extended to cancel multi-user clipping noise in a uplink MC-CDMA systems. Clipping is the simplest method to overcome high peak-to-average power ratio of multi-carrier signals but it makes the multi-carrier signals distorted. Reconstruction methods use non-distorted samples to reconstruct distorted samples in the receiver but multi-user interference causes the methods do not work properly because all the received samples are distorted by clipping and interference and so there is no undistorted samples to be used in recovering clipped samples. On the other hand, multi-user interference cancellation methods do not work properly...
Joint multi-user interference and clipping noise cancellation in uplink MC-CDMA system
, Article AEU - International Journal of Electronics and Communications ; Volume 64, Issue 5 , 2010 , Pages 425-432 ; 14348411 (ISSN) ; Azmi, P ; Marvasti, F ; Sharif University of Technology
Abstract
In this paper, an iterative method is proposed to jointly cancel multi-user interference and clipping noise in uplink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems. Clipping is the simplest method to overcome high peak-to-average power ratio of multi-carrier signals but it makes the signals distorted. Reconstruction methods use non-distorted samples to reconstruct distorted samples in the receiver but multi-user interference causes the methods do not work properly because all the received samples are distorted due to clipping and interference and so there is no undistorted samples to be used in recovering clipped samples. On the other hand, multi-user interference...