Results 241 to 250 of about 144,701 (287)

Different Guard Interval Techniques for OFDM: Performance Comparison

2007
In this paper, we consider different types of guard intervals for OFDM systems, i.e. cyclic prefix (CP), zero padding (ZP) and known symbol padding (KSP). We compare the different OFDM systems with respect to their SNR performance. We show that CP-OFDM and ZP-OFDM have exactly the same performance, whereas KSP-OFDM has a slightly worse performance ...
Heidi Steendam, Marc Moeneclaey
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Influence of the guard interval on the M-DPPM spectrum

[1991 Proceedings] 6th Mediterranean Electrotechnical Conference, 2002
A general expression for M-DPPM (digital pulse position modulation) power spectral density is presented. From it, conditions for the existence of symbol and slot discrete frequency components (important for receiver timing synchronization) are indicated.
A.V.T. Cartaxo, A.A. De Albuquerque
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Different known guard intervals for single-/multi-carrier transceiver

IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006., 2006
In general, cyclic prefix (CP), zero padding (ZP) or fixed symbol padding (FP) can be seen as the guard interval (GI) for data transmitting. By inserting enough long GI, we can remove inter-block interference (IBI) completely, and the signal distortion due to multi-path environment can be simply compensated by frequency domain equalization (FDE).
Li Wei 0003, Ming Chen 0001, Shixin Cheng, Haifeng Wang 0002   +3 more
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Automatic Detection of the Guard Interval Length in OFDM System

Journal of Communications, 2006
Orthogonal Frequency Division Multiplexing (OFDM) has been increasingly used in wireless broadband communication systems. Guard interval (GI) is used in OFDM system to reduce inter-symbol interference (ISI). As selection of the length of guard interval depends on the channel condition, the length of guard interval will change dynamically.
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A Novel Equalization Method for OFDM Systems without Guard Interval

2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010
In this paper, we propose a novel equalization method for OFDM systems without guard interval (GI). The performance of GI-free OFDM system is usually limited by inter-symbol interference (ISI) and inter-carrier interference (ICI). The proposed method is to firstly detect the tail part of transmitted OFDM symbol, then eliminate the ISI and ICI to ...
Umut Yunus, Hai Lin 0001, Katsumi Yamashita   +2 more
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Performance of coded OFDM VIA variable guard interval

Journal of Electronics (China), 2005
This letter presents the principles of Coded Orthogonal Frequency Division Multiplexing (COFDM) system and focuses on the effect of the Guard Interval (GI) on the system performance. The role of the GI parameter period to solve the problem of interferences that occur at the receiver is discussed. A new COFDM concept with a Variable GI (VGI) is proposed
Waiyun Li, Mohammed Bakir, Jingao Liu, Shouzheng Zhu   +3 more
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Development of a new OFDM transceiver without guard interval

2007 IEEE International Conference on Electro/Information Technology, 2007
This paper develops a new orthogonal frequency division multiplexing (OFDM) receiver model that does not use the guard interval. This proposed technique (termed as preprocessing technique) is further extended to the IEEE 802.11a standard for wireless local area networks (WLANs) in this paper.
N. Pulimamidi, J. Nulu, M. Mansour Tahernezhadi   +2 more
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S2-GI: Intelligent Selection of Guard Interval in High Throughput WLANs

2020 11th International Conference on Computing, Communication and Networking Technologies (ICCCNT), 2020
Short guard interval (SGI) is a new feature of the physical (PHY) layer in High Throughput Wireless Local Area Networks (HT-WLANs), like IEEE 802.11n/ac, where the value of the guard interval is set to 400ns instead of general 800ns. By reducing the overhead of extra idle time between transmissions of two successive symbols, SGI helps to enhance the ...
Raja Karmakar, Soumalya De, Arindam Ghosh, Tinku Adhikari, Punit Jain   +4 more
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Channel identification using known symbol guard intervals

Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738), 2005
Block transmission systems with guard intervals usually either use a cyclic prefix or introduce a sequence of zeros of length greater than or equal to an upper bound of the channel memory between blocks to prevent inter-block interference. Another possibility is to transmit known symbols in the guard interval.
D.H. Pham, J.H. Manton
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Frequency domain equalization of DMT/OFDM systems with insufficient guard interval

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2003
We propose a new, generalized approach for equalization of discrete multi-tone (DMT) systems, which not only uses redundancy in the time domain by adding a guard interval, but also takes advantage of existing or intentionally placed redundancy in the frequency domain. For this purpose, we replace the one tap frequency equalizer in the DMT receiver by a
Trautmann, Steffen, Karp, Tanja, Fliege, Norbert J.   +2 more
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