FDM in LTE Conventional multi-carrier operation as it is used for FDM works simply by selecting a number of center frequencies - one for each carrier
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The price for the optimum subcarrier spacing is the sensitivity of OFDM to frequency errors. If the receiver’s frequency is some fractions of the subc
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RF engineering is a trade off between: required radio spectrum (bandwidth), speed of data transmission (bit rates) and complexity of implementation. T
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There Are Three Codes in CDMA PN Long Code,PN Short Code & Walsh Code. PN Long Code The Long Code is a PN sequence that is 242 - 1 bits (chips)
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WiMAX antennas, just like the antennas for car radio, cell phone, FM radio, or TV, are designed to optimize performance for a given application. The f
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In an actual application, the system implements the modulation in this way: as shown above, I and Q channel sequences in the figure represen
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The Handover is the process of transferring an ongoing call or data session fromone cell connected to the core network to another It is transparent fo
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To provide the most critical information to the UEs, the eNodeB uses the BCH channel The information is sent on pre-defined time-frequency resou
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The original release of the EIA/TIA-95-B standard defined the protocol messages and formats to be used in the CDMA system. This release is know as Rev
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The 3G LTE uses 3 Quadrature Amplitude Modulations (QAMs) depending on the radio quality. QAM uses both the amplitude and the phase. LTE dev
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The radio waves are distributed in 3Hz ~ 3000GHz. This spectrum is divided into 12 bands, as shown in the above table. The frequencies in each
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If the voice signal is modulated and transmitted directly after channel coding, due to the condition changes in mobile communication channel
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