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With increasing symbol duration T s, the relative excess delays and delay differences decrease.
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High-spectral-power IN pulses degrade the performance of the OFDM system by reducing its signal-to-noise ratio (SNR) and increasing symbol-error rate (SER) [4].
There are two main reasons for increased symbol level amplitude in DDST.
This comes from the fact that relay terminal estimates the channel and transmits to the destination with an increased symbol duration due to the insertion of new pilot symbols.
It can be seen that for the same source block size, increasing the symbol size results in shorter download times.
In OFDM system, the entire channel is divided into many narrow subchannels, which are transmitted in parallel, thereby increasing the symbol duration and reducing the ISI.
In an OFDMA system, a data stream is divided into several parallel sub-streams with a reduced data rate (increasing the symbol duration), and each sub-stream is modulated and transmitted on a separate orthogonal sub-carrier.
It should be noted here that a larger CP length allows for improving the spectral containment, similar as increasing the symbol length characterized by the overlapping factor K, as indicated in Table 8.
This is due to the fact that increasing the symbol size reduces the number of packets to be sent (and this reduces the hardware errors as indicated in Fig. 9a, b) and hence the total number of source blocks.
As the delay spread increases, symbol duration must also be increased in order to maintain a near-flat channel in every subcarrier.
It increases the symbol interval and thereby decreases the intersymbol interference (ISI) [4].
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