A Modified Non Coherent PN Code Acquisition Scheme Rethnakaran P UbiNetics

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Presentation transcript:

A Modified Non Coherent PN Code Acquisition Scheme Rethnakaran P UbiNetics Joint work with P.K.Venkataraghavan PK (Synopsys Inc) and Tapan Ray (Wipro Technologies)

© UbiNetics 2004 CONFIDENTIAL Agenda Acquisition Problem Existing solutions Modified Non-coherent Detection scheme Performance Analytical, Simulation results Summary

© UbiNetics 2004 CONFIDENTIAL DSSS System (Transmitter) Transmit Signal

© UbiNetics 2004 CONFIDENTIAL DSSS System (Receiver) Received Signal Down Converted I-Q

© UbiNetics 2004 CONFIDENTIAL Acquisition Problem Identify (Detect) the transmitted PN code (Code Phase) from the received (I and Q) signals,

© UbiNetics 2004 CONFIDENTIAL System Model Receiver Structure

© UbiNetics 2004 CONFIDENTIAL Non Coherent Detection Scheme Non Coherent Detector Structure Why Non Coherent? Unknown Random Phase Data modulation yet to be removed Penalty Compared to Coherent scheme

© UbiNetics 2004 CONFIDENTIAL Modified Non Coherent Scheme DNC Structure

© UbiNetics 2004 CONFIDENTIAL System Model (Continued) Post Detection Integration No Post Detection (L=1) Matched Filter Based Receiver PN Sequence used AWGN No Fading DSSS/BPSK Performance Criteria – ROC Probability of Detection Vs Probability of False Alarm

© UbiNetics 2004 CONFIDENTIAL Analytical Results (ROC) False Alarm Probability Probability of Detection

© UbiNetics 2004 CONFIDENTIAL Performance (NC Versus DNC)

© UbiNetics 2004 CONFIDENTIAL DNC Advantage (Over NC)

© UbiNetics 2004 CONFIDENTIAL Simulation Results

© UbiNetics 2004 CONFIDENTIAL Summary New Structure Proposed Analytical Expressions (ROC) Derived 2dB SNR Advantage Over Conventional Non Coherent Scheme Supported by System Level Simulations

© UbiNetics 2004 CONFIDENTIAL Q&A Thank You Rethnakaran P UbiNetics