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In the power line communication system(PLC), due to the commercial PLC modems feature low power transmission and the large amount of noise, the communication system has a very low signal to noise ratio(SNR) which seriously affects the reliability of the signal transmission. Considering the situation of low SNR, this paper presents a noise mitigation method based on normalization time-frequency peak...
A new digital differentiator-based demodulator in a zeroIF receiver for 2.4 GHz Zigbee applications is proposed. It receives the In-phase (I) and Quadrature-phase (Q) signals which are oversampled and quantized by a 4-bit ADC @ 8 MHz. Two one-order digital differentiators based on Taylor series, two multipliers and an adder are adopted to calculate the derivative of the signal phase. Then an Integrate-and-Dump...
In digital signal processing, it is difficult to achieve flexible arbitrary sampling rate conversion. As for this problem, a new algorithm is proposed to realize arbitrary variable up-sampling based on lookup table. The algorithm firstly constructs an original filter whose coefficients are stored in ROMs. Then the target filter is decimated from lookup table by mapping sampling rate as addressed....
In this paper, we investigate the combination of Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude Modulation (OFDM/OQAM) with spread spectrum Code Division Multiple Access (CDMA) transmission scheme as an alternative to classical Multicarrier-CDMA (MC-CDMA) system over multipath fading channel. The performance of real CDMA-OFDM/ OQAM transmission system with Walsh Hadamard...
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