Wireless Communications

Characteristics of wireless channel

Characteristics of wireless channel Wireless Communication The wireless radio channel poses a severe challenge as a medium for reliable high-speed communication. It is not only susceptible to noise, interference, and other channel impediments, but...

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Adaptive Modulation

Adaptive Modulation Wireless Communications I-The Use of Adaptive Modulation Not Fixed Modulation: The reason is as the Fading channels confront us with the problem of lost Packets and the need for frequent re-transmissions and Wireless communication...

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Which Is the Better Adaptive or Fixed Modulation

Adaptive or Fixed Modulation Wireless communications Which better Adaptive or Fixed Modulation ? This experiment to made to know which is the better adaptive modulation or fixed modulation We assume that the channel conditions are known for...

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Switching Between Modulation Schemes In Adaptive Modulation

Switching Between Modulation Schemes In Adaptive Modulation Adaptive Modulation The Idea of Switching: if the performance of the modulation schemes as the next figure, Switching between modulation schemes is done to maintain a BER less than a certain...

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Cycle prefix In Wireless Communications

Cycle prefix In Wireless Communications Wireless Communications Cycle prefix : The cyclic prefix means introduction of guard interval between each symbol to reduce the inter-symbol interference (ISI) caused by delay spread in the transmission channel, the CP achieved...

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Basics of OFDM In Wireless Communications

Basics of OFDM In Wireless Communications Wireless Communications Basics of OFDM: OFDM Transmitter: OFDM Transmitter is shown as follows: The bit sequence is first subjected to channel encoding to reduce the probability of error at the receiver due to the channel...

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Comparison Between FDM and OFDM In Wireless Communications

Comparison Between FDM and OFDM Wireless Communications ------------------------------------------------------------------------- Comparison Between FDM and OFDM In Wireless Communications ,wireless Communications channel, 4G Communications,Comparison...

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Orthogonality of OFDM In Wireless Communications

Orthogonality of OFDM Wireless Communications In OFDM, the spectra of subcarriers overlap but remain orthogonal to each other. This means that at the maximum of each subcarrier spectrum, all the spectra of other subcarriers are zero. The receiver samples...

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