Performance analysis of angle of arrival estimation algorithms for dynamic spectrum access in cognitive radio networks

Dhope, Tanuja Satish; Šimunić, Dina; Dhokariya, Nikhil; Pawar, Vishal Sanjay; Gupta, Bhawana

doi:10.1109/icacci.2013.6637157

Cited by 3 publications

(1 citation statement)

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“…For example, we recognize that ITD can be used to estimate the angle of arrival (AOA) (as in traditional beamformers), while the ILD is a type of differential received signal strength indicator (RSSI) measurement (Mead et al, 1991 ; Chan et al, 2007 ) that may also be useful for AOA estimation. Thus, hardware-efficient ITD and ILD estimators for RF signals would enable energy-efficient RF source localization, which in turn would be of significant interest for a variety of spatial processing tasks in wireless systems, including (i) beam management for MIMO transceivers (Xue et al, 2018 ), (ii) dynamic spectrum access (DSA) algorithms for cognitive radio (CR) networks (Dhope et al, 2013 ), and (iii) interference/clutter rejection in radar processors (Chen and Vaidyanathan, 2008 ; Gu et al, 2018 ). The resulting location estimates can be combined with other source properties (frequencies, modulation types) to generate so-called “RF scene maps”.…”

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confidence: 99%

Bio-Inspired Radio-Frequency Source Localization Based on Cochlear Cross-Correlograms

Wang

Mandal

2021

Front. Neurosci.

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This paper describes a bio-inspired radio frequency (RF) scene analysis system based on cross-correlating the outputs of two single-chip RF spectrum analyzers. The latter are implemented using digitally-programmable “RF cochlea” chips (in 65 nm CMOS) that integrate a transmission-line active cochlear model, consisting of 50 parallel exponentially-spaced stages for analyzing the radio spectrum from 1.0 to 8.3 GHz, together with an output encoding network. The encoders convert the analog outputs of all cochlear stages into parallel delta-sigma (Δ-Σ) modulated digital signals for real-time demodulation and analysis by a digital back-end processor. These outputs can also be multiplied with each other to generate cochlear correlation matrices (known as cross-correlograms). Simulation results demonstrate the use of cross-correlograms for wide-range time-delay estimation and real-time multi-source localization at different frequencies and input signal-to-noise (SNR) ratios. Over-the-air measurement results from an experimental two-channel RF scene analysis prototype confirm the use of such time-delay estimates, which are analogous to interaural time differences (ITDs) in the auditory system, for azimuthal source localization at 3.4 GHz. In addition, differences in received signal strength at the two cochleas, which are analogous to interaural level differences (ILD) in biology, are also used to localize RF sources.

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