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Cognitive radio baseband OFDM receiver design

Author: ZhangQingLin
Tutor: LiuZuo
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Cognitive radio Automatic gain controller Energy-Aware OFDM receiver
CLC: TN858
Type: Master's thesis
Year: 2011
Downloads: 71
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Abstract


In recent years , the use of wireless communication band more and more tense , the actual test found some licensed bands of spectrum usage is relatively low . In this context , a new technology to improve the spectrum utilization - cognitive radio is proposed , the technology enables the cognitive user does not affect the case of the authorized user to use licensed bands . In wireless communication , since the communication user may occur between the displacement , it may be transferred from the open areas to areas with cover , so that the receiving user receives the signal power will be fluctuating , if the signal receiver may be burned rather small signal will affect the communication quality , which requires to study automatic gain controller . On the other hand , as a cognitive user , in order to use the idle frequency bands , the primary task is to identify the current utilization of the spectrum , which relates to spectrum sensing . Orthogonal Frequency Division Multiplexing multicarrier modulation technique due to its high adaptability , flexibility , spectrum utilization of the advantages of the best implementations of the physical layer of cognitive radio systems become recognized . This article by formula digitized analog envelope detector , export digital envelope detector to achieve formula , and then using FPGA . The reaction rate is relatively slow , taking into account the digital-to-analog hybrid AGC using digital and analog the hybrid AGC plus digital AGC realization method to solve the problem . Focus on spectrum sensing method based on energy - aware . In the signal-to-noise ratio is not at the same time the performance of energy -aware simulation . Energy detection method can be realized to explore , and that the hardware platform for the project under the noise energy energy detection can not be achieved , because the noise of the hardware platform has been greater than the intermediate frequency noise . In the hardware implementation of the process to determine the noise threshold , given the measured performance . Finally, research works OFDM-based cognitive radio platform receiver baseband . Debug the performance of the ADC , FPGA and DSP actual data throughput requirements analysis proposed EMIFA as a two - chip interface . Communication protocol between the FPGA and DSP design , and two DPRAM to ping-pong operation . Finally , the entire OFDM receiver design .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Receiver equipment, radio Radio > Various frequency radio
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