How Does CDMA Work? Introduction to Basic Principles

Claude Shannon:

The Einstein of Information Theory

• The core idea that makes CDMA possible was first explained by Claude Shannon, a Bell Labs research mathematician
• Shannon's work relates amount of information carried, channel bandwidth, signal-to-noise-ratio, and detection error probability. It shows the theoretical upper limit attainable

SHANNON’S CAPACITY EQUATIONC= Bωlog2[1 + ]S N Bω= bandwidth in HertzC = channel capacity in bits/secondS = signal powerN = noise power.

In 1948 Claude Shannon published his landmark paper on information theory, A Mathematical Theory of Communication. He observed that "the fundamental problem of communication is that of reproducing at one point either exactly or approximately a message selected at another point." His paper so clearly established the foundations of information theory that his framework and terminology are standard today.Shannon died Feb. 24, 2001, at age 84.

February, 2005 Technical Introduction to CDMA