OFDMA_Part13 - response of a power amplifier. Operation in...

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13 [58], Schmidl and Cox build upon [57]’s approach and estimate the frequency offset with only one training block by forcing the first half of the training block to be identical to the second half of the training block. [18] exploits the repetitive property of the CP to jointly estimate the time- offset and the frequency-offset. 2.5 Techniques To Reduce PAPR The peak to average power ratio (PAPR) is a very important attribute of a communication system. A low PAPR allows the transmit power amplifier to operate efficiently, whereas a high PAPR forces the transmit power amplifier to have a large back-off in order to ensure linear amplification of the signal [15]. This is demonstrated in Figure 3_1 that shows the typical
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Unformatted text preview: response of a power amplifier. Operation in the linear region of this response is generally required to avoid signal distortion, so the peak value is constrained to be in this region. Clearly it would be desirable to have the average and peak values be as close together as possible in order to have the power amplifier operate at the maximum efficiency. Additionally, a high PAPR requires high resolution for the receiver ADC, since the dynamic range of the signal is much larger for high PAPR signals. High resolution ADCs place a complexity and power burden on the receiver front end. Figure 3_1. Typical Response of a Power Amplifier [15]...
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This note was uploaded on 09/27/2009 for the course ECE 399 taught by Professor Prof during the Spring '09 term at University of Texas.

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