Design, simulation and hardware validation of a low-cost CLMS echo canceling system

Prieto, Pablo; Sanchez, Mikel; Ser, Javier Del; Mendicute, Mikel

doi:10.1109/newcas.2009.5290486

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…In [9] a standard-dependent strategy is proposed based on the pilot carriers of the DVB-T/H signal. On the contrary, the low complexity solutions described in [10] and [11] are based on the least mean square (LMS) algorithm and are capable to estimate the echoes thanks to the correlation properties of the DVB-T/H signal. All the mentioned solutions rely on some specific features of the OFDM signals to repeat, while the low complexity technique proposed in [12] is basically independent of the characteristics of the signal and can be used in different application scenarios.…”

Section: Introductionmentioning

confidence: 99%

FPGA Design and Performance Evaluation of a Pulse-Based Echo Canceller for DVB-T/H

Chiurco

Mazzotti

Zabini

et al. 2012

IEEE Trans. on Broadcast.

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In this paper, we address the main design issues and performance characteristics of an echo canceller for digital DVB-T/H on-channel repeaters (OCRs). The low-complexity channel cancellation technique here described is based on the introduction of a negative feedback loop capable to counterbalance the coupling effects between the OCR antennas (echoes). In the initial phase, locally generated pulse trains are transmitted to estimate the coupling channel between the transmitting and the receiving antennas. This first echo estimation is used to set-up the cancelling unit, whose purpose is to generate a properly filtered replica of the repeated DVB-T/H signal compensating the echoes. After the initial set-up of the system, efficient tracking of the echoes can be performed through traditional least mean square (LMS) techniques. After developing a proper theoretical model, we introduce and discuss some important performance figures such as mean rejection ratio (MRR) and echo suppression at nominal position (ESNP). Then, a detailed description of our implementation of the echo canceller on a field programmable gate array (FPGA) board is reported. Finally, the performance of our prototype are evaluated and the measurement results are compared with those derived by our analytical model.

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Section: Introductionmentioning

confidence: 99%

FPGA Design and Performance Evaluation of a Pulse-Based Echo Canceller for DVB-T/H

Chiurco

Mazzotti

Zabini

et al. 2012

IEEE Trans. on Broadcast.

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A low-cost echo cancellation algorithm in DTMB On-Channel Repeater

Qian

Xia

et al. 2010

2010 2nd International Conference on Signal Processing Systems

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An Ultrasound System for Tumor Detection in Soft Tissues Using Low Transient Pulse

Ratnakar

Zhou

2014

IEEE Systems Journal

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Different techniques are used for breast tumor detection that include microwave imaging, X-ray imaging, and magnetic resonance imaging. They provide accurate assessment of tumor size and location but suffer from some inherent drawbacks. Ultrasound is a detection technique that has been demonstrated as the one without harmful side effects on patients. This paper presents a method to detect the size and location of echogenic tumor in soft tissues using ultrasound. Quantitative ultrasound is utilized to allow an ultrasound signal to be sent from a transmitter to multiple receivers. This received signal is analyzed for echogenic and echolucent tumors to differentiate between them, along with a non-tumor sample. It is also studied for the delay and signal distortion, in order to determine the tumor location. The results are implemented by using field-programmable-gate-array (FPGA) and digital-signalprocessor (DSP) technologies. The low transient pulse (LTP) technique is successfully utilized to generate the required shortduration ultrasonic signals in the proposed system. This codesign demonstrates a good application of the FPGA/DSP platform for LTP generation and processing received signals.Index Terms-Biomedical acoustics, digital signal processors, field-programmable gate array (FPGA), low transient pulse (LTP).

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Design, simulation and hardware validation of a low-cost CLMS echo canceling system

Cited by 3 publications

References 7 publications

FPGA Design and Performance Evaluation of a Pulse-Based Echo Canceller for DVB-T/H

FPGA Design and Performance Evaluation of a Pulse-Based Echo Canceller for DVB-T/H

A low-cost echo cancellation algorithm in DTMB On-Channel Repeater

An Ultrasound System for Tumor Detection in Soft Tissues Using Low Transient Pulse

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