BPSK+BOC (5,2) SIGNAL SIMULATION AND GENERATION USING

MATLAB AND VECTOR SIGNAL GENERATOR

Presenter:ANSHUMAN SHARMA

Date : 10TH July, 2014MATLAB EXPO

Authors:ANSHUMAN SHARMAM R RAGHAVENDRAV RAJU SAGI

Presentation Outline

Motivation

Scope and Objective

BPSK+BOC modulation

Implementation

Simulated spectrum

Conclusion & future work

References

Motivation

BPSK+BOC (5,2) signal simulation and generation using MATLAB

and Vector signal generator

Scope and Objective

Scope : Simulation and generation of BPSK+BOC(5,2) signal at L5 and Sband.

Objective:

Generation of above signal to test Vector Signal Analyzer for followingparameters:

• Error Vector magnitude EVM

• Carrier Suppression

• Magnitude Error

• Gain Imbalance

• Quadrature Error

• The constellation points

BPSK+BOC modulation

• IRNSS is an autonomous regional satellite navigation system being

developed by ISRO.

• Works at L5 and S band and will provide two types of service--

Standard Positioning Service (SPS)

Restricted Service (RS)

• Modulation scheme : BOC + BPSK modulation

• The SPS @ 25bps is spreaded at ~ 1Mcps and BPSK modulated.

• The RS @ 25bps is spreaded at ~ 2Mcps and BOC modulated.

• BOC(m, n) : where fsc= m*f and fc= n*f. f is the reference frequency.

fsc is square subcarrier frequency and fc is the chipping rate.

Implementation

BASEBAND SIGNAL SIMULATION

USING MATLAB

PC

VECTOR SIGNAL GENERATOR

AWG LO

COSDEVICE UNDER TEST

(VSA)

SIN

LAN I

Q

RF OUTPUT

Implementation contd…

• For BPSK : PN7 sequence at 1 Mbps is generated using

MATLAB.

• For BOC:

PN9 sequence at 2 Mbps is generated using MATLAB.

Modulated on to a square wave subcarrier at 5MHz to create the

BOC baseband signal.

S boc(t) = s(t) * sign[sin(2πfsct)]

• The two signals are added to simulate the composite baseband

BPSK+BOC(5,2) signal.

Simulated Spectrum

Simulated Spectrum

Conclusion and future work

This work was aimed at generation of BPSK+ BOC modulated composite signal.

The composite signal was generated using MATLAB and VSG.

Using this signal, Vector signal analyzer was successfully tested and qualified.

Same concept can be used for generating any type of Complex waveform.

References References

[1] R N Mutagi, “Pseudo noise sequences for engineers”, ELECTRONICS & COMMUNICATION

ENGINEERING JOURNAL, APRIL 1996.

[2] Emilie Rebeyrol, et al.,“Interplex Modulation for Navigation Systems at the L1 band" , ION NTM

2006, 18-20 January 2006, Monterey, CA

[3] Vladimir Kharisov, et al., “Optimal aligning of the sums of GNSS Navigation signals”, Jan/Feb

2012, www.insidegnss.com

THANK YOU