Design and Implementation of the RF Transmitter for LTE User Equipment.
Eng. Marwa Mansour AbdelfattahAbdelrahman;
Abstract
Software defined radio implementation is required for LTE radio transceivers. An SDR consists of an RF front end and a digital processor platform (DSP). The LTE transmitter can be divided into two major parts: baseband which consist of source coding, channel coding, digital modulation and matched filteringand RFwhich consist of frequency synthesizer, I/Q modulator, RF power amplifier, bandpass filter and antenna. Typically, the baseband part is implemented digitally and the RF part is analog. A digital to analog converter (DAC) is connecting the baseband and RF parts.
This thesis is devoted to the design and implementation of the front end which is divided intoan active and a passive front end. Theactive front end consists of a frequency synthesizer, an I/Q modulator and an RF power amplifier while the passive front end includesthe antenna and band pass filter.
The thesis presents the design, implementation, and testing of the LTE RF transmitter wherethe active components are selected from the off shelf components available in the semiconductor marketwhile the passive front end components are made of a microstrip circuits.
This thesis focuses on the design and implementation of the passive front end; the antennas and band pass filters. It presents the design of two microstrip patch antennas and a third order parallel coupled band pass filter with defected ground structure that can be used in cellular communication applications, especially in LTE . The antennas and filter were printed using FR-4 substrate material with dielectric constant of ɛr =4.4, thickness of h = 1.6 mm and loss tangent tan δ = 0.025.
The overall dimensions of the first antenna is 39 mm * 37mm * 1.6 mm with 50 Ω impedance. This antenna operates between 1580MHz and 2239.5MHz for return loss of less than - 6 dB and covers LTE network bands 1, 2, 3, 4, 9, 10, 23, 25, 33, 34, 35, 36, 37, and 39. The simulation results suggest that the antenna gain and directivity value are 1.7dB and 2.5 dBi with omnidirectional radiation pattern.
The overall dimension of the second antenna is 25 mm * 21 mm * 1.6 mm with 50 Ω impedance. This antenna operates between 1896MHz and 2015.8MHz for return loss of less than - 6dB and covers LTE network bands 1, 2, 25, 33, 36, and 37. The simulation results suggest that the antenna gain and directivity value are 1.4dB and 1.7dBi with omnidirectional radiation pattern.
The parallel coupled filter with over all dimensions of 45 mm * 25 mm achieves center frequency of 1.95 GHz and band width of 80 MHz and covers LTE network bands 36 (TDD) or 1 (FDD). The order of the proposed band pass filter is three and three defected ground structure are used.
About the selected active front end components; firstly, the frequency synthesizer is selected with step size of 200 KHz and frequency range from 0.37GHz to 5.7GHz, so that it covers all LTE bands. The programming of frequency synthesizer is done by PLLWizard software and DC590 controller board.
Secondly, the selected direct conversion I/Q modulator has frequency range from 0.2GHz to 6GHz. It allows direct modulation of an RF signal using differential baseband I and Q signals.
Lastly the selected RF Power Amplifier has two modes of operation, a high power mode (HPM) and low power mode (LPM).The PA achieves gain of about 25.5 dB and
This thesis is devoted to the design and implementation of the front end which is divided intoan active and a passive front end. Theactive front end consists of a frequency synthesizer, an I/Q modulator and an RF power amplifier while the passive front end includesthe antenna and band pass filter.
The thesis presents the design, implementation, and testing of the LTE RF transmitter wherethe active components are selected from the off shelf components available in the semiconductor marketwhile the passive front end components are made of a microstrip circuits.
This thesis focuses on the design and implementation of the passive front end; the antennas and band pass filters. It presents the design of two microstrip patch antennas and a third order parallel coupled band pass filter with defected ground structure that can be used in cellular communication applications, especially in LTE . The antennas and filter were printed using FR-4 substrate material with dielectric constant of ɛr =4.4, thickness of h = 1.6 mm and loss tangent tan δ = 0.025.
The overall dimensions of the first antenna is 39 mm * 37mm * 1.6 mm with 50 Ω impedance. This antenna operates between 1580MHz and 2239.5MHz for return loss of less than - 6 dB and covers LTE network bands 1, 2, 3, 4, 9, 10, 23, 25, 33, 34, 35, 36, 37, and 39. The simulation results suggest that the antenna gain and directivity value are 1.7dB and 2.5 dBi with omnidirectional radiation pattern.
The overall dimension of the second antenna is 25 mm * 21 mm * 1.6 mm with 50 Ω impedance. This antenna operates between 1896MHz and 2015.8MHz for return loss of less than - 6dB and covers LTE network bands 1, 2, 25, 33, 36, and 37. The simulation results suggest that the antenna gain and directivity value are 1.4dB and 1.7dBi with omnidirectional radiation pattern.
The parallel coupled filter with over all dimensions of 45 mm * 25 mm achieves center frequency of 1.95 GHz and band width of 80 MHz and covers LTE network bands 36 (TDD) or 1 (FDD). The order of the proposed band pass filter is three and three defected ground structure are used.
About the selected active front end components; firstly, the frequency synthesizer is selected with step size of 200 KHz and frequency range from 0.37GHz to 5.7GHz, so that it covers all LTE bands. The programming of frequency synthesizer is done by PLLWizard software and DC590 controller board.
Secondly, the selected direct conversion I/Q modulator has frequency range from 0.2GHz to 6GHz. It allows direct modulation of an RF signal using differential baseband I and Q signals.
Lastly the selected RF Power Amplifier has two modes of operation, a high power mode (HPM) and low power mode (LPM).The PA achieves gain of about 25.5 dB and
Other data
| Title | Design and Implementation of the RF Transmitter for LTE User Equipment. | Other Titles | تصميم وتنفيذ وحدة إرسال تردد راديوي لنظام " ال. تي. إ ". | Authors | Eng. Marwa Mansour AbdelfattahAbdelrahman | Issue Date | 2014 |
Recommend this item
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.