Simple Codes Concept: How Codes Can Be Used Let us consider the following activities at a transmitter location: Step 1 | An arbitrary data sequence di(t) generated by a digital source. Here, let's use +1s and -1s instead of 0s and 1s as in previous example. Step 2 | Now generate an arbitrary Code sequence ci(t). Here again let's use +1s and -1s. Step 3 | Now let's multiply these two sequences as shown in step 3 above. CODE: AN INTRODUCTION By Dr. Ernest Simo © 1999 DR. ERNEST SIMO - SPACE2000