1 A Quadrature Downconversion Autocorrelation Receiver Architecture for UWB Simon Lee, Sumil Bagga, Wouter A. Serdijn 05/24/2008 Inha Telecom Lab Inha.

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Presentation transcript:

1 A Quadrature Downconversion Autocorrelation Receiver Architecture for UWB Simon Lee, Sumil Bagga, Wouter A. Serdijn 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab IEEE Conference 2004 on UWB Systems and Technologies Presented By: S M Riazul Islam

2 Objectives To Develop a New UWB Receiver Architecture No timing and template problems Avoids processing at high frequency Reduces power consumption Narrowband interference rejection 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab

3 Contents Introduction System Analysis Results and Conclusion 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab

4 Introduction: Rake Receiver Want of Perfect synchronization and matching of template with the received pulse A lot of rake fingers are required, implementation point of view. So, Transmitted reference scheme (autocorrelation receiver) [Hoctor and Tomlinson] 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab

5 Introduction Autocorrelation Rx: DHTR Communication 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Direct processing of UWB: on-cheap parasitic reactance, so large currents or expensive high speed tech (GaAs) required Narrowband Interference: Both Rake Rx and Autocorrelation Rx suffer from this problem IEEE802.11a and Hiper LAN(5GHz), UWB antenna, and 2.4 GHz LAN

6 Introduction Proposed Receiver Architecture 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab

7 System Analysis: Frequency Conversion LO f= 6.85, 3.1 to to 3.75 GHz. But WLAN of GHz LO f=5.5 GHz, converted BW extends to 5.1 and converted 2.4 GHz falls in band Lo f=5.5 GHz, filter out below =0.35 GHz and above =3.1 GHz But loss of incoming frequency band? From 5.5+( )=8.6 GHz to 10.6 GHz and from 5.15 to 5.85=0.7 GHz 2.7 GHz, 36% or 1.9dB 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab

8 System Analysis: Mathematical Treatment 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Time domain analysis: Quadrature down-conversion autocorrelation Rx architecture: Delay, phase and amplitude mismatch:

9 Simulated Results 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab

10 Conclusions A new UWB receiver architecture has been introduced It avoids high frequency processing gain and hence low power consumption, reject narrowband interference Readily achievable in todays IC tech. Performance loss up to 1.9 dB compared to ideal case 05/24/2008 Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab Inha Telecom Lab