23 research outputs found
FPGA Implementation of Joint Spatio-Temporal Spectrum Sensing Algorithm Based on Direct Localization Method
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A cognitive radio based solution to coexistence of FH and OFDM signals implemented on USRP N210 platform
No full textA solution to coexistence of OFDM and FH signals based on principles of cognitive radio implemented on USRP N210 platform
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TDOA Localization in IR UWB Systems
No full textThe influence of the IEEE 802.15.4a channel model
parameters on the performance of the Time Difference Of
Arrival (TDOA) localization method in Impulse Radio Ultra-
Wide Band (IR UWB) systems is addressed. As a consequence
of the cluster structure of the stochastic 802.15.4a
channel model some channel parameters between the IR
UWB transmitter and each of the reference sensor nodes in
the sensor array are spatially correlated. This quasideterministic
structure of channel parameters is assumed, when a
spatial signal model on sensor array is based on this channel
model for TDOA localization purposes. Thus, the influence
of channel correlation as well as geometrical arrangement of
the reference sensor nodes on the positioning accuracy is the
main focus of our investigation
Localization of users in multiuser MB OFDM UWB systems based on TDOA principle
No full textIn this paper, we analyze localization capabilities of multi-band OFDM UWB systems. TDOA (time difference of arrival) method is used for localization. M temporally synchronized sensors are localizing transmitter of unknown location. Space-temporal signal model in AWGN channel and in IEEE 802.15.3a channel model is derived analytically.We investigate the influence of correlation of channels between transmitter and each of sensors in sensor array on localization accuracy. The results are verified through simulation of hypothetical measurement setup where sensor array have circular geometry and the transmitter is placed within the array circle
Spatio-temporal spectrum sensing using distributed antenna systems and direct localization methods
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