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The two receivers have the same sampling rate, but with an offset in sampling time. In this paper, we present a practical wideband receiver consisting of two I/Q channel-based receivers. However, the sampling rate of an ADC is limited by physics and increasing sampling rate might not always be a feasible option. The wider the channel bandwidth, the less numbers of channels are necessary to cover the same bandwidth and the more compact and economic wideband receiver can be implemented. Therefore the working bandwidth of each channel can be increased simply by increasing sampling rate of its ADC.
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Based on the Nyquist theory, a signal whose frequency is less than half of sampling rate can be reconstructed from its sampled data. Blackman window is applied to reduce spectral leakage. The bandwidth of each channel is determined by the analog-to-digital converter's (ADC) sampling rate. Its working bandwidth is divided into several channels, each of which covers a different spectrum. It needs to cover a broad bandwidth which is only sparsely occupied by signals of interest and the signal detection needs to be conducted in a real-time operation.Ī conventional wideband receiver diagram is illustrated in Fig. As a result, the wideband receiver presents an interesting design case. For example, for non-image radar to detect an aeroplane, to avoid reassembling the target echoes from many cells, its signal bandwidth is about 10 MHz. On the other hand, because of the resolution limitation, the bandwidth of radar signals is usually narrower than communication signals. Therefore, it is very desirable for the wideband receiver to cover a spectrum as wide as possible. Unlike a communication receiver, the wideband receiver has no ‘a priori’ knowledge about signal frequency, power, duration etc. One of wideband receiver's applications is to detect radar signals. The wideband receiver for surveillance applications is designed to detect an unknown number of uncooperative signal(s) over a broad bandwidth. IET Generation, Transmission & Distribution.IET Electrical Systems in Transportation.IET Cyber-Physical Systems: Theory & Applications.IET Collaborative Intelligent Manufacturing.CAAI Transactions on Intelligence Technology.