frequency selective mobile channels
Spectrally Efficient Communication over Time-Varying Frequency-Selective Mobile Channels: Variable-Size Burst Construction and Adaptive Modulation
... Indeed, consider using solution (S1), from Section 1, to reduce the number of data symbols per burst. Then, to main- tain the same transmission e ffi ciency, the number of train- ing symbols must also be reduced. However, ...
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Orthogonal frequency division multiplex synchronization techniques for frequency selective fading channels
... RTHOGONAL frequency division multiplexing (OFDM) was discovered by Chang in his pioneering paper in 1966 ...nondispersive channels [2], ...or mobile wireless scenario—the increased dispersion ...
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Optimizing time and space MIMO antenna system for frequency selective fading channels
... smart mobile (SBM) antenna ...(MIMO) channels [10], [11] or joint transmitter receiver systems ...a frequency domain ...fading channels in the presence of CCI are ...for frequency ...
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Receivers and CQI Measures for MIMO-CDMA Systems in Frequency-Selective Channels
... proposed in [18]. The study of advanced receivers also leads us to a better characterization of the MIMO-CDMA link. Such characterization of a wireless link, usually known as channel quality indicator (CQI), is very ...
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Adaptive Zero Padding OFDM over Frequency Selective Multipath Channels
... Standard HIPERLAN/2 channel models [15] are used. The OFDM block size of 64 and a terminal speed of 3 m/s are assumed. The expected BW efficiency for different channel models ranges from 93%–100%, while employing CP- or ZP- ...
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STC-Mimo Block Spread OFDM in Frequency Selective AWGN Channels
... (4G) mobile communication systems, they are highly projected to overcome enduring problems of 3G (third generation) systems and to provide a wide variety of new technological services, from high quality voice to ...
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Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels
... communications channels typically exhibit time vari- ant channel quality fluctuations [1] and hence conventional fixed-mode modems suffer from bursts of transmission errors, even if the system was designed for ...
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Joint CFO Estimation and Data Detection in OFDM systems
... over frequency selective fast fad- ing ...the frequency shift in fast fading channel cannot be separated as a constant from the channel impulse ...the frequency selective fast fading ...
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SECURE PACKETS IN WIRELESS SENSOR NETWORKS BASED ON FREQUENCY SELECTIVE CHANNELS
... JAN-FEBRUARY, 2015, VOL-III/XVI www.srjis.com Page 2755 be used to extract shared secret keys even in the presence of eavesdroppers. Yet, existing key generation protocols require that the wireless devices move randomly ...
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Linear and Nonlinear Time Domain Block Equalizers on MIMO Frequency Selective Channels
... speed mobile communications with wide trans- mission bandwidth, Inter-Symbol Interference (ISI) due to multipath propagation must be ...the frequency selective fading ...time selective fading ...
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Analysis and implementation of OFDM system and channel estimation based IEEE 802 11A
... slot by averaging the channel estimates calculated from each pilot symbol. And the second step involves channel tracking or interpolation, in which the tracking of the time varying fading channel is realized through a ...
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Spreading Code Assignment Strategies for MIMO CDMA Systems Operating in Frequency Selective Channels
... in frequency nonselective channels and multiuser ...in frequency selective channels, the orthogonality between the di ff erent codes in a user’s set is lost and cross-correlation ...
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Blind CP OFDM and ZP OFDM Parameter Estimation in Frequency Selective Channels
... A cognitive radio system needs accurate knowledge of the radio spectrum it operates in. Blind modulation recognition techniques have been proposed to discriminate between single-carrier and multicarrier modulations and ...
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Diversity Techniques for Single Carrier Packet Retransmissions over Frequency Selective Channels
... For communication systems with very limited feedback channels, the CSIT assumption is not applicable. However, in the absence of CSIT, there are some useful techniques that enhance the system performance in slow ...
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Effective Needs of Space-Time-Frequency Coding in MIMO-OFDM Communication over Frequency Selective Fading Channels
... for frequency selective fading channels" such as the space time code design for single carrier transmission over frequency selective fading ...and frequency diversity ...
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Frequency-Shift Zero-Forcing Time-Varying Equalization for Doubly Selective SIMO Channels
... canonical frequency- domain representation of the minimal norm LTV-ZF equal- izer, which assures the best ABER performances in the pres- ence of AWGN, and we have discussed the mathematical con- ditions assuring ...
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Title: High Speed OFDM Implementation in FPGA
... Abstract— FPGA is one of the efficient & economic way to implement the circuit. Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation technique. OFDM provides high bandwidth efficiency ...
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An Extensive Review on STBC for MIMO OFDM System
... 355 Authors Parismita Gogoi and Kandarpa Kumar Sarma demonstrated in their research paper the Diversity methods provide the receiver with independently faded copies of the transmitted signal with the expectation that at ...
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Performance Analysis of the Blind Minimum Output Variance Estimator for Carrier Frequency Offset in OFDM Systems
... Orthogonal frequency division multiplexing (OFDM) has been considered as a promising modulation scheme for the next generation wireless communication ...are frequency-nonselective and overlapped in ...to ...
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ISSN 2349-4506
... Orthogonal Frequency Division Multiplexing (OFDM) and Multi Carrier Code Division Multiple Access (MC-CDMA), which change over recurrence particular channel to a few level blurring channels accordingly ...
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