Wireless Communications Lab Manual
Wireless communication lab manual (subject code: 171004) 2012 department of electronics & communication alpha college of enggineering & technology.
Page 1 WIRELESS COMMUNICATION LAB MANUAL (SUBJECT CODE: 171004) 2012 DEPARTMENT OF ELECTRONICS & COMMUNICATION ALPHA COLLEGE OF ENGGINEERING & TECHNOLOGY Page 2 WIRELESS COMMUNICATION LAB MANUAL (SUBJECT CODE: 171004) 2012 DEPARTMENT OF ELECTRONICS & COMMUNICATION ALPHA COLLEGE OF ENGGINEERING & TECHNOLOGY 1 EXP. NO AIM 1 Study of the Tx IQ/Rx IQ signals.
DATE: / / 2013 Apparatus: 1. Mobile Phone Traine ST2132 kit 2. C.R.O Probes Procedure: 1. Insert the SIM and power ‘On’ the trainer. Make a Call to the trainer or from the trainer 3.
Keep the Call ‘On’. Connect the probe of spectrum analyzer at TP (1) and observe the signal in the Tx band. Now connect the probe to TP (2) observe the signal in the Rx band. Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst.
A similar Tx burst can be observed by connecting probe TP (5) & (6) respectively. Signal figure shows an IQ Tx/Rx burst signal Conclusion: Page 3 WIRELESS COMMUNICATION LAB MANUAL (SUBJECT CODE: 171004) 2012 DEPARTMENT OF ELECTRONICS & COMMUNICATION ALPHA COLLEGE OF ENGGINEERING & TECHNOLOGY 1 EXP. NO AIM 1 Study of the Tx IQ/Rx IQ signals. DATE: / / 2013 Apparatus: 1.
Mobile Phone Traine ST2132 kit 2. C.R.O Probes Procedure: 1. Insert the SIM and power ‘On’ the trainer. Make a Call to the trainer or from the trainer 3. Keep the Call ‘On’.
Connect the probe of spectrum analyzer at TP (1) and observe the signal in the Tx band. Now connect the probe to TP (2) observe the signal in the Rx band.
Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst. A similar Tx burst can be observed by connecting probe TP (5) & (6) respectively. Signal figure shows an IQ Tx/Rx burst signal Conclusion: 2 EXP. NO AIM 2 Observe signal constellation of GMSK signal. DATE: / / 2013 Apparatus: 1. Mobile Phone Trainer ST2132 kit 2. C.R.O Probes Procedure: 1.
Make a call to the trainer. Receive the call and keep ‘On’. Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst signal. Conclusion: Page 4 WIRELESS COMMUNICATION LAB MANUAL (SUBJECT CODE: 171004) 2012 DEPARTMENT OF ELECTRONICS & COMMUNICATION ALPHA COLLEGE OF ENGGINEERING & TECHNOLOGY 1 EXP. NO AIM 1 Study of the Tx IQ/Rx IQ signals. DATE: / / 2013 Apparatus: 1. Mobile Phone Traine ST2132 kit 2.
C.R.O Probes Procedure: 1. Insert the SIM and power ‘On’ the trainer. Make a Call to the trainer or from the trainer 3.
Keep the Call ‘On’. Connect the probe of spectrum analyzer at TP (1) and observe the signal in the Tx band. Now connect the probe to TP (2) observe the signal in the Rx band. Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst.
A similar Tx burst can be observed by connecting probe TP (5) & (6) respectively. Signal figure shows an IQ Tx/Rx burst signal Conclusion: 2 EXP.
NO AIM 2 Observe signal constellation of GMSK signal. DATE: / / 2013 Apparatus: 1. Mobile Phone Trainer ST2132 kit 2. C.R.O Probes Procedure: 1. Make a call to the trainer. Receive the call and keep ‘On’.
Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst signal. Conclusion: 3 EXP. NO AIM 3 Study the working of Audio IC and observe Audio Signal.
DATE: / / 2013 Apparatus: 1. Mobile Phone Traine ST2132 kit 2.
C.R.O Probes Theory: COBBA ASIC provides an interface between the base band and the RF-circuitry.COBBA performs digital to analog conversion of the received signal. For transmit path COBBA perform analog to digital conversion of the ‘Transmit Amplifier Power Control Ramp’ and the In-phase and Quadrate signals. A slow speed digital to analog converter will provide automatic frequency control (AFC). COBBA is at any time connected to CPU (ASIC) with two interfaces, one for transferring Tx and Rx data between CPU and COBBA and one for transferring codec Rx/Tx samples. The audio control and processing are taken care by the COBBA-IC, which contains the audio codec and CPU. CPU contains MCU and DSP blocks, handling and processing the audio signals. The inputs can be taken from an internal microphone, a headset microphone or a hand free unit.
The microphone signals from different sources are connected to separate inputs at the COBBA ASIC. Input for the microphone signals are differential type. Input and output selection and gain control is performed inside the COBBA ASIC according to control messages the CPU. DTMF and other audio tones are generated and encoded by the CPU and transmitted to COBBA IC for decoding. Audio Block Page 5 WIRELESS COMMUNICATION LAB MANUAL (SUBJECT CODE: 171004) 2012 DEPARTMENT OF ELECTRONICS & COMMUNICATION ALPHA COLLEGE OF ENGGINEERING & TECHNOLOGY 1 EXP. NO AIM 1 Study of the Tx IQ/Rx IQ signals.
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DATE: / / 2013 Apparatus: 1. Mobile Phone Traine ST2132 kit 2. C.R.O Probes Procedure: 1. Insert the SIM and power ‘On’ the trainer.
Make a Call to the trainer or from the trainer 3. Keep the Call ‘On’. Connect the probe of spectrum analyzer at TP (1) and observe the signal in the Tx band. Now connect the probe to TP (2) observe the signal in the Rx band. Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst. A similar Tx burst can be observed by connecting probe TP (5) & (6) respectively. Signal figure shows an IQ Tx/Rx burst signal Conclusion: 2 EXP.
NO AIM 2 Observe signal constellation of GMSK signal. DATE: / / 2013 Apparatus: 1. Mobile Phone Trainer ST2132 kit 2.
C.R.O Probes Procedure: 1. Make a call to the trainer. Receive the call and keep ‘On’. Connect two probe of CRO one at TP (3) & the other on TP (4) observe the Rx burst signal. Conclusion: 3 EXP. NO AIM 3 Study the working of Audio IC and observe Audio Signal. DATE: / / 2013 Apparatus: 1.
Mobile Phone Traine ST2132 kit 2. C.R.O Probes Theory: COBBA ASIC provides an interface between the base band and the RF-circuitry.COBBA performs digital to analog conversion of the received signal. For transmit path COBBA perform analog to digital conversion of the ‘Transmit Amplifier Power Control Ramp’ and the In-phase and Quadrate signals. A slow speed digital to analog converter will provide automatic frequency control (AFC). COBBA is at any time connected to CPU (ASIC) with two interfaces, one for transferring Tx and Rx data between CPU and COBBA and one for transferring codec Rx/Tx samples.
The audio control and processing are taken care by the COBBA-IC, which contains the audio codec and CPU. CPU contains MCU and DSP blocks, handling and processing the audio signals.
The inputs can be taken from an internal microphone, a headset microphone or a hand free unit. The microphone signals from different sources are connected to separate inputs at the COBBA ASIC. Input for the microphone signals are differential type. Input and output selection and gain control is performed inside the COBBA ASIC according to control messages the CPU. DTMF and other audio tones are generated and encoded by the CPU and transmitted to COBBA IC for decoding.
Audio Block 4 COBBA IC and CPU Communicate through a PCM Serial Interface. The interface consists of following signal: a PCM codec master clock (PCMDCLK), a frame synchronization signal to DSP (PCMSCLK), a codec transmit data line (PCMTX) and a codec receiver data line (PCMRX). The COBBA-IC generates the PCMDCLK clock, which is supplied to DSP.
The COBBA-IC also generates the PCMSCLK signal to DSP by dividing the PCMDCLK. The PCMDCLK frequency is 1.000 MHz and is generated by dividing the RFICIK 13 MHz by 13. The COBBA-IC further divides the PCMDCLK by 125 to get a PCMSCLK signal 8.2 KHz. AFC Function: AFC is used to lock the transceiver frequency to the frequency of the base station. AFC voltage is generated in COBBA with 11 bit DA converter. There is an RC-filter in AFC control line to reduce the noise from the converter.
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They are AFC tracks base station frequency continuously, so transceiver has got a stable frequency. Note: Before performing the observation, fully charge the battery and keep the charging ‘On’. Procedure: 1. Connect the probe of CRO to TP (8). Make a Call to the trainer or from the trainer.
Ask the person on the line to speak and observe the audio frequency changes. Semester Notes, Wireless Communication Lab Manual, Extra Questions, Sample Paper, Sublimation Digital Lab Techniques Manual, shortcuts and tricks, Wireless Communication Paper (EEE), Free, video lectures, Exam, MCQs, Summary, Filtration Digital Lab Techniques Manual, past year papers, study material, ppt, mock tests for examination, Viva Questions, Important questions, Titration Digital Lab Techniques Manual, Wireless Communication, Previous Year Questions with Solutions, Objective type Questions, practice quizzes, Wireless Communication Lab Manual, pdf, Wireless Communication Lab Manual.