Title page for ETD etd-122298-205651


Type of Document Master's Thesis
Author Cheung, Tze Chiu
Author's Email Address tcheung@vt.edu
URN etd-122298-205651
Title 2GHz W-CDMA Radio Transceiver
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Sweeney, Dennis G. Committee Chair
Bostian, Charles W. Committee Member
Woerner, Brian D. Committee Member
Keywords
  • transceiver
  • W-CDMA
Date of Defense 1998-12-15
Availability unrestricted
Abstract
A radio transceiver has been designed and built for a W-CDMA experimental system

operating at 2GHz. The radio is an RF front-end for mobile terminals. The radio provides

the functions of modulation and demodulation to enable transmitting and receiving digital

information through the air link. The radio comprises one transmitter in conjunction with

transmit power control (TPC), two independent receivers in conjunction with automatic

gain control (AGC) and automatic frequency control (AFC), and one common

synthesizer. Data exchange between the radio and the baseband processor takes place in

an 8-bit digital format. Digital-to-analog converters (DAC) at the transmitter and analog-

to-digital converters (ADC) at the receivers provide the interface between the radio and

the baseband processor. DACs are also used to convert the 7-bit command codes from the

processor to analog signals for the TPC, AGC and AFC. The radio transceiver is designed

to meet the stringent requirements imposed by the W-CDMA system. The 70dB TPC

enables the adaptive power control for combating the near-far problem. The high linearity

of the transmitter provides the use of linear modulation with less than 40dBc adjacent

channel power suppression. The 0.03125ppm tuning resolution of the AFC maximizes

the receiver sensitivity. The 80dB AGC produces a constant demodulated signal level to

the ADC regardless of the RF signal level. This thesis documents the design methodology

for this radio transceiver.

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  vita.pdf 4.31 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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