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Frequency Variation of Adaptive MIMO OFDM


Posted by: seminar surveyer
Created at: Tuesday 05th of October 2010 01:28:11 AM
Last Edited Or Replied at :Tuesday 05th of October 2010 01:28:11 AM
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er a multiple-input multiple-output (MIMO) system in conjunction with orthogonal frequency division multiplexing (OFDM) operating over frequency selective Rayleigh and Rician fading environments. In particular we focus on the eigenvalues of the complex Wishart matrices defined for each OFDM subcarrier and investigate their variation across frequency. Since the throughput and performance of such a system are heavily dependent on the eigenvalues, the results and analysis presented have many applications. Examples include the performance of beamforming systems which is governed by the maximum eig..................[:=> Show Contents <=:]



MIMO-OFDM-BASED AIR INTERFACE full report


Posted by: computer science topics
Created at: Monday 07th of June 2010 09:57:31 AM
Last Edited Or Replied at :Thursday 29th of December 2011 09:43:24 PM
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by inverse FFT (IFFT) to an OFDM symbol sequence. A cycle prefix (CP) is attached to every OFDM symbol to mitigate the effect of channel delay spread, and a preamble is inserted in every slot for timing. Finally, the constructed data frame is transferred to IF/RF components for transmission.
Receiver Figure shows a simplified block diagram of a MIMO-OFDM receiver. The received symbol stream from IF/RF components over the receive antennas are first synchronized, including coarse frequency synchronization and timing aided by the preamble. After that, the preambles and CP are extracted from t..................[:=> Show Contents <=:]



ofdm


Posted by: varunknp
Created at: Thursday 07th of January 2010 04:35:54 AM
Last Edited Or Replied at :Friday 08th of January 2010 06:00:47 AM
ofdm dsss , ofdm doppler, ofdm data rates , ofdm demodulation, ofdm concepts , ofdm channel model, ofdm chip , ofdm constellation, ofdm capacity , ofdm cck, ofdm cdma , ofdm channel estimation, ofdm cyclic prefix , ofdm basics ppt, ofdm baseband , ofdm beamforming, ofdm bit rate , ofdm bpsk, ofdm benefits , ofdm block diagram, ofdm bandwidth , ofdm book, ofdm basics , ofdm and matlab, ofdm animation , ofdm architecture, ofdm and ofdma , ofdm and multipath, ofdm and mc cdma , ofdm applications, ofdm agc , ofdm advantages, ofdm and 4g , ofdm and mimo, ofdm ,
need ppt on o..................[:=> Show Contents <=:]



OFDM on Mobile Data Communication


Posted by: shibin.sree
Created at: Monday 28th of December 2009 07:43:18 AM
Last Edited Or Replied at :Wednesday 20th of April 2011 11:02:37 PM
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ents one sub carrier from interfering with another (called intercarrier interference, or ICI).
The cyclic prefix is actually a copy of the last portion of the data symbol appended to the front of the symbol during the guard interval, as shown in Figures 6.1 and 6.3. Multipath causes tones and delayed replicas of tones to arrive at the receiver with some delay spread. This leads to misalignment between sinusoids, which need to be aligned as in Figure 6.3 in order to be orthogonal. The cyclic prefix allows the tones to be realigned at the receiver, thus regaining orthogonality.

OFDM DESIG..................[:=> Show Contents <=:]



High Speed OFDM Packet Access


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:41:29 AM
Last Edited Or Replied at :Saturday 08th of December 2012 03:14:58 AM
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The upload and downlink transfer rates is 50 Mbps and 100Mbps and has a spectral efficiency of 2-4 times compared to 3GPP release 6.

· When compared with W-CDMA. Has a better latency time of around 20ms for round trip time from user terminal to RAN which is same as of a combined HSDPA/HSUPA system

The 3GPP LTE project by incorporating the HSOPA achieves the quadruple play services - voice, high-speed interactive applications including large data transfer and feature-rich IPTV with full mobility. Even though UMTS along with HSDPA and HSUPA gives high data transfer rates, wireless..................[:=> Show Contents <=:]



WIDEBAND OFDM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:13:47 PM
Last Edited Or Replied at :Thursday 01st of April 2010 04:15:58 AM
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e required bandwidth.OFDM was invested in 1960?s, only recently it has recognized as an excellent method for bi-directional wireless data communication. It is extremely efficient in mitigating common problems in high-speed communication such as multipath..................[:=> Show Contents <=:]



VTEC


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:59:36 AM
Last Edited Or Replied at :Wednesday 13th of February 2013 08:48:58 AM
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anding for Variable valve Timing and lift Electronic Control) is a system developed by Honda to improve the ..................[:=> Show Contents <=:]



VVT-i


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:59:05 AM
Last Edited Or Replied at :Saturday 20th of September 2008 11:59:05 AM
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ine, the 3.5L 2GR-FE V6. This engine can be found in the Avalon, RAV4, and Camry in the US, the Aurion in Australia, and various models in Japan, including the Estima. Other Dual VVT-i engines will be seen in upcoming Toyota models, including a new 4 cylinder Dual VVT-i engine for the new generation 2007/2008 Corolla. Another notable implementation of the Dual VVT-i is the 2GR-FSE D-4S engine of the Lexus GS450h. By adjusting the valve timing, engine start and stop occur virtually unnoticable at minimum compression, and fast heating of the catalytic converter to its light-off temperature is po..................[:=> Show Contents <=:]



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