diff --git a/mapping.m b/mapping.m
new file mode 100644
index 0000000..f8266c7
--- /dev/null
+++ b/mapping.m
@@ -0,0 +1,35 @@
+function [map_out]=mapping(data,mode,scale)
+
+% mode : Modulation order in power of 2 (1/2/4/6 = BSPK/QPSK/16-QAM/64-QAM)
+% scale : scaling up or down the modulation, default value = 1
+
+input_seq = data;
+
+switch mode
+    case 1
+        b=scale*[1 -1];
+    case 2
+        b=scale*[1+1i -1+1i 1-1i -1-1i];
+    case 4
+        b=scale*[1+1i 1+3i 1-1i 1-3i 3+1i 3+3i 3-1i 3-3i -1+1i -1+3i -1-1i -1-3i -3+1i -3+3i -3-1i -3-3i];
+    case 6
+        b=scale*[3+3i 3+1i 3+5i 3+7i 3-3i 3-1i 3-5i 3-7i 1+3i 1+1i 1+5i 1+7i 1-3i 1-1i 1-5i 1-7i 5+3i 5+1i 5+5i 5+7i 5-3i 5-1i 5-5i 5-7i 7+3i 7+1i 7+5i 7+7i 7-3i 7-1i 7-5i 7-7i -3+3i -3+1i -3+5i -3+7i -3-3i -3-1i -3-5i -3-7i -1+3i -1+1i -1+5i -1+7i -1-3i -1-1i -1-5i -1-7i -5+3i -5+1i -5+5i -5+7i -5-3i -5-1i -5-5i -5-7i -7+3i -7+1i -7+5i -7+7i -7-3i -7-1i -7-5i -7-7i];
+    otherwise
+        error('wrong choice');
+end
+
+count=1;
+map_out = zeros(1,ceil(length(input_seq)/mode));
+
+for i=1:(ceil(length(input_seq)/mode))
+    temp=0;
+    for j=1:mode
+        temp=bitor(temp,bitshift(input_seq(count),(j-1)));
+        count=count+1;
+        if(count>length(input_seq))
+            break;
+        end
+    end
+    map_out(i)=b(temp+1);
+end
+