Novel approach to the design of I/Q demodulation filters

Zhang, G.; Al-Khalili, D.; Inkol, R.; Saper, R.

doi:10.1049/ip-vis:19941251

Cited by 17 publications

(2 citation statements)

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“…The wideband radar returns are directly digitized. A digital quadrature demodulation system [ 21 , 22 , 23 ] is applied to get the amplitude and phase information of the received signals. A channelization receiver typically employs digital filter banks to extract multiple narrowband sub-channels from the received wideband signals [ 24 , 25 , 26 ].…”

Section: The Proposed Methodsmentioning

confidence: 99%

A Channelization-Based DOA Estimation Method for Wideband Signals

Guo

Zhang

Lin

et al. 2016

Sensors

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Abstract:In this paper, we propose a novel direction of arrival (DOA) estimation method for wideband signals with sensor arrays. The proposed method splits the wideband array output into multiple frequency sub-channels and estimates the signal parameters using a digital channelization receiver. Based on the output sub-channels, a channelization-based incoherent signal subspace method (Channelization-ISM) and a channelization-based test of orthogonality of projected subspaces method (Channelization-TOPS) are proposed. Channelization-ISM applies narrowband signal subspace methods on each sub-channel independently. Then the arithmetic mean or geometric mean of the estimated DOAs from each sub-channel gives the final result. Channelization-TOPS measures the orthogonality between the signal and the noise subspaces of the output sub-channels to estimate DOAs. The proposed channelization-based method isolates signals in different bandwidths reasonably and improves the output SNR. It outperforms the conventional ISM and TOPS methods on estimation accuracy and dynamic range, especially in real environments. Besides, the parallel processing architecture makes it easy to implement on hardware. A wideband digital array radar (DAR) using direct wideband radio frequency (RF) digitization is presented. Experiments carried out in a microwave anechoic chamber with the wideband DAR are presented to demonstrate the performance. The results verify the effectiveness of the proposed method.

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Section: The Proposed Methodsmentioning

confidence: 99%

A Channelization-Based DOA Estimation Method for Wideband Signals

Guo

Zhang

Lin

et al. 2016

Sensors

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“…Among an all-digital IF receiver, DDC has become a cornerstone technology in wireless communication systems [2][3]. The main function of DDC is mixing the IF signal from ADC with a digitized cosine for In-phase channel (I-channel) and a digitized sine for the quadrature channel (Q-channel), and down-converting to low-frequency digital baseband signal, then decreasing the sampling rate into an original sampling rate to facilitate the subsequent signal processing.…”

Section: Design Of Ddcmentioning

confidence: 99%

Design of a SoC With High-Speed DDC for Software Radio Receiver

Jun¹,

Liu

Li³

et al. 2012

AMR

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This paper presents a novel scheme for software radio receiver application, which integrates a high-speed digital down converter (DDC) block into a SoC (system on chip) based on OR1200 CPU. The proposed design can transform intermediate frequency (IF) signal to baseband signal and realize the real-time baseband signal processing. The simulation results indicate that the design is capable of accepting data at a 200MHz sample rate and the verification results based on Xilinx FPGA show that the SFDR of DDC can reach to 70.59dBFS.The synthesized results on 0.18um CMOS technology reveal that the maximum clock frequency can reach to 116MHz and the total area is 5.662mm2, and the corresponding power consumption is below 150mW. It should have a good potential for wireless communication applications.

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