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CHANNEL SOUNDING USING USRP2 & GNU-RADIO . Under :- Prof S.N Merchant SPANN LAB,IIT Bombay. Channel Impulse Response And Coherence Bandwidth Estimation. By:- Rohit Sharma Jay Prakash.

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channel sounding using usrp2 gnu radio

CHANNEL SOUNDING USING USRP2 & GNU-RADIO

Under :-

Prof S.N Merchant

SPANN LAB,IIT Bombay

Channel Impulse Response And Coherence Bandwidth Estimation

By:-

Rohit Sharma Jay Prakash

channel sounding usingusrp2 gnu radio

Why?:- Motivation

Increased Use of Wireless Devices

Data-Intensive High Bandwidth Services

Strain in capacity of RF Spectrum

Channel Sounding UsingUSRP2 & GNU-RADIO

Most Communication becomes impractical above 10GHZ in Microwave Region.

channel sounding usingusrp2 gnu radio1

Multiple propagation paths:

  • Line-of-Sight (LoS) and NLoS Invites Multipath invites:-
  • Scattering,
  • Reflection,
  • Diffraction.
  • Channel Becomes:-
  • Frequency dependent,
  • Time dependent and
  • Position dependent.

Channel Sounding UsingUSRP2 & GNU-RADIO

Multipath Effects of Channel

Ultimately Coherence Bandwidthis adversely affected.

channel sounding usingusrp2 gnu radio6

Host PC(Tx) Flow-chart

Host Pc (Transmitter)

Gb Ethernet

USRP2

Channel Sounding UsingUSRP2 & GNU-RADIO

PN Sequence Vector Source

GNU-RADIO

Unpack_to_pack

BPSK Differential gray coded Modulation

Digital_bert_tx.py

USRP2

Uhd_Transmitter

UHD-DRIVER

channel sounding usingusrp2 gnu radio7

Host PC(Rx) Flow-chart

I

USRP2

Gb Ethernet

Host Pc (Receiver)

File Sink

Channel Sounding UsingUSRP2 & GNU-RADIO

Q

Data Processing I

Read Complex_to_Binary

File Sink(.dat)

Windowing on Data-Stream Per PnSequence

Window/Seq

channel sounding usingusrp2 gnu radio8

Data Processing II

Window/Seq

Cross Correlated Data

Channel Sounding UsingUSRP2 & GNU-RADIO

Cross_Corr

Local Pn-Seq

Channel Impulse Response

Coherence Bandwidth Estimation

Averaged Over Windows

Frequency Correlation Function

Average CIR

FFT

Power Delay Profile

channel sounding usingusrp2 gnu radio9

Host PC(Rx) Flow-chart

Host Pc (Receiver)

Uhd_Receiver

Channel Sounding UsingUSRP2 & GNU-RADIO

GNU-RADIO

Demodulator

Octave Based

Post-Processing

Stream Converter

Digital_bert_rx.py

File Sink(.dat)

UHD-DRIVER

channel sounding usingusrp2 gnu radio10

Our Automated-Sounder APPLICATION

Channel Sounding UsingUSRP2 & GNU-RADIO

Hardware

Software

  • Gnu-Radio 3.6.0
  • Python
  • Octave
  • UHD_Driver (Latest stable)
  • USRP2(Tx,Rx)
  • Two PCs
  • Gb Ethernet

Requirements:-

slide19

Channel Sounding UsingUSRP2 & GNU-RADIO

Frequency Correlation Function