Lecture9_Spread_spectrum

Lecture9_Spread_spectrum - Wireless Communications...

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EE475 DR. Kirkman Lecture 9 USC 1 Wireless Communications Technology Spread Spectrum Dr. George Kirkman EE475 Fall 2006
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EE475 DR. Kirkman Lecture 9 USC 2 Multiple Access http://www.umtsworld.com/technology/cdmabasics.htm
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Lecture 9 USC 3 CDMA process flow Signal transmission consists of the following steps: 1. A pseudo-random code is generated, different for each channel and each successive connection. 2. The Information data modulates the pseudo-random code (the Information data is “spread”). 3. The resulting signal modulates a carrier. 4. The modulated carrier is amplified and broadcast. Signal reception consists of the following steps: 1. The carrier is received and amplified. 2. The received signal is mixed with a local carrier to recover the spread digital signal. 3. A pseudo-random code is generated, matching the anticipated signal. 4. The receiver acquires the received code and phase locks its own code to it. 5. The received signal is correlated with the generated code, extracting the Information data.
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This note was uploaded on 04/09/2010 for the course EE 475 taught by Professor Kirkman during the Spring '07 term at USC.

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Lecture9_Spread_spectrum - Wireless Communications...

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