PXI_Add AWGN to a carrier generated using NI RFSG in Arbitrary Waveform mode

Hello !
Does anyone know how to add AWGN to a carrier generated using NI RFSG ?
I know how to generate a CW signal using NI RFSG in Arbitrary Waveform mode (please see the attached file), but I have not found out yet how to add AWGN to it.
Thank you !
Aina

Hi Aina,
I may still be not completely understanding exactly what you're asking for. So in my example that I gave you, we were adding the AWGN to both the I and Q arrays seperately. What you're looking for is to actually add the noise to the signal after it has been upconverted. Does that sound right? With our hardware, this is not possible because the baseband I/Q data is mixed with the carrier in hardware as the last step before it is generated. To add AWGN after the signal has been placed on the carrier you would need a noise generator. The best you can do is to add the AWGN to the baseband I/Q and then upconvert it based on the carrier frequency you specify in RFSG. Let me know if that was helpful to you.

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Steps followed
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Creating a temp file...
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mohankumar (start) <[email protected]>
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In Ecrypt File
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111...
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D:\test>
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Creating a temp file...
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using PGPEncryptedDataGenerator...
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-----BEGIN PGP MESSAGE-----
Version: BCPG v1.31
hIwD7qqzP41CKpUBBACOnQE265ud3AuJ8zGx9TjUFyeSwZH+PZJhjGLBTkI7gKdh
/hIF1u/sCzubw+9Mt8dbS0V2uHiqQgkCHAYIQKoVmiN65s8sUsIS0q3cTtBudUnd
xIEiyegtvB8LEpzldU/XrSglh8h6MdhhcPql46BG+0vs6p/bUAOygNv5e/DGzck2
1wNvc2/u2ffBgEP4qfrJUcF9OlvVAm03aB0S6gP8cH4LVdo5K9Bwu3d71qNKsryP
mML16rkA
=lfxf
-----END PGP MESSAGE-----
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Code As follows
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openpgp.PGPCompressedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPUtil;
import org.bouncycastle.openpgp.*;
import java.util.Iterator;
public class BouncyCastlePGPTest {
private static PGPPrivateKey findSecretKey(
                                                  InputStream keyIn,
                                                  long keyID,
                                                  char[] pass)
                                                  throws IOException, PGPException, NoSuchProviderException {
PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(keyIn));
PGPSecretKey pgpSecKey = pgpSec.getSecretKey(keyID);
if (pgpSecKey == null) {
return null;
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in = PGPUtil.getDecoderStream(in);
try {
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enc = (PGPEncryptedDataList)pgpF.nextObject();
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PGPPrivateKey sKey = null;
PGPPublicKeyEncryptedData pbe = null;
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pbe = (PGPPublicKeyEncryptedData)it.next();
sKey = findSecretKey(keyIn, pbe.getKeyID(), passwd);
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throw new IllegalArgumentException("secret key for message not found.");
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System.out.println("\n\n\n");
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System.err.println("message failed integrity check");
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else
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catch (PGPException e) {
System.err.println(e);
if (e.getUnderlyingException() != null) {
e.getUnderlyingException().printStackTrace();
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               String line = "";
               while ((line = isr.readLine()) != null) {
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               // read the key
               FileInputStream     in = new FileInputStream(publicKeyFilePath);
               PGPPublicKey key = readPublicKey(in);
               // find out a little about the keys in the public key ring
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                    count++;
                    System.out.println((String)iterator.next());
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//FileInputStream in = new FileInputStream(args[1]);
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               System.out.println(e.toString());
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          } catch (Exception e) {
               System.out.println(e.toString());
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          System.out.println("Get Public Key");
          try {
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               Iterator itr = pgpPub.getPublicKeys();
               PGPPublicKey pk = null;
               return pgpPub.getPublicKey();
          } catch (IOException io) {
               System.out.println("readPublicKey() threw an IOException");
               System.out.println(io.toString());
               throw io;
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          try {
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          out = new ArmoredOutputStream(out);
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          System.out.println("creating comData...");
          // get the data from the original file
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          PGPUtil.writeFileToLiteralData(comData.open(bOut), PGPLiteralData.BINARY, new File(fileName));
          comData.close();
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          System.out.println("using PGPEncryptedDataGenerator...");
          // object that encrypts the data
          PGPEncryptedDataGenerator cPk = new PGPEncryptedDataGenerator(PGPEncryptedDataGenerator.CAST5, new SecureRandom(), "BC");
          cPk.addMethod(encKey);
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          System.out.println("wrote bOut to byte array...");
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          // cOut.close();
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          out.close();
          } catch (IOException ex) {
               System.out.println("IOException\t" +ex.toString());
          } catch (NoSuchProviderException ex1) {
               System.out.println("NoSuchProviderException\t" +ex1.toString());
          } catch (PGPException ex2) {
               System.out.println("PGPException\t" +ex2.toString());
}

First - you're responding to a year-old message. I doubt the OP is still around.
Second - DSA is a Digital Signature Algorithm. The error tells you exactly what the problem is - DSA is not an encryption algorithm, and can't be used as one.
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PXI_Add AWGN to a carrier generated using NI RFSG in Arbitrary Waveform mode

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