From 7dc26d6d0bec5bbc75eb219be150c7d1a464f666 Mon Sep 17 00:00:00 2001
From: Jens Ahrensfeld <jens@jayfield.org>
Date: Sat, 2 May 2015 10:46:24 +0000
Subject: [PATCH] [RX] - export corrected version of passband signal as wav
 file

git-svn-id: http://moon:8086/svn/matlab/trunk@56 801c6759-fa7c-4059-a304-17956f83a07c
---
 ofdm/ofdm_rx.m | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ofdm/ofdm_rx.m b/ofdm/ofdm_rx.m
index dc08088..22ff919 100644
--- a/ofdm/ofdm_rx.m
+++ b/ofdm/ofdm_rx.m
@@ -32,6 +32,7 @@ if (ndim == 2)
     x = x.*exp(-j*(2*pi*(foff/fs_)*(0:len-1)'));
 elseif (ndim == 1)
     fprintf('Mode: Passband\n');
+	x = xwav - mean(xwav);
     x = xwav.*exp(-j*(2*pi*(0.25-foff/fs_)*(0:len-1)'));
     hlp = FIRCalcLowpass(12000/fs_, 15);
     x = filter(hlp, 1, x);
@@ -54,6 +55,15 @@ x = x./max(abs(x));
 xout = [real(x) imag(x)];
 wavwrite(xout,fs,nbits,'ofdm_rx.wav');
 
+% Modulate on carrier
+xup = upsample(x, 4);
+hlp = FIRCalcLowpass(0.25, 129);
+xup = filter(hlp, 1, xup);
+
+y = exp(j*2*pi.*(0:length(xup)-1)'*0.25) .* xup;
+
+wavwrite(y,4*fs,nbits,'ofdm_rx_passband.wav');
+
 x = awgn(x, SNR, 'measured');
 K = fix((length(x))/(N+Ng))-1;