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Frequency domain equalization (FDE) has shown its ability to improve the performance of single carrier system. For DS-CDMA system, MMSE based FDE can obtain frequency diversity gain through undergoing more fading paths. Meanwhile, delay time-domain windowing technique has been introduced to suppress the noise power which perturbs the channel estimation. In this paper, we analysis the impact of delay...
In this paper, a secure communication system based on fractional Fourier transform (FrFT) is proposed. Information data is encrypted by a certain order FrFT at transmitter, and then divided into two parts and sent out. The receiver decodes the signal using FrFT with the corresponding order to the transmitter to obtain the original data. Simulation results demonstrate the effectiveness of the proposed...
The combination of ultra-wideband technique and cooperative technique can improve the performance of ultra-wideband communications effectively and reduce the power consumption. In order to improve the system performance as well as reduce the hardware cost, a cooperative ultra-wideband system model using transmitted reference receiver and decode-and-forward (DF) relay protocol is proposed, and normalized...
Power control techniques are adopted in narrow-band systems to overcome near-far effects by varying transmitted power levels so that all signals are received with equal power level. However, since the transmission data rate is too high in ultra-wideband (UWB) in which multimedia communication is desired to realize, it is impossible to accomplish perfect power control with current technologies and...
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