Lecture2

Lecture2 - Wireless Communications Multiple Access Modes...

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EE475 DR. Kirkman Lecture 2 USC 1 Wireless Communications Multiple Access Modes and dBs Dr. George Kirkman EE475 Fall 2006
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EE475 DR. Kirkman Lecture 2 USC 2 RF Spectrum
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EE475 DR. Kirkman Lecture 2 USC 3 Frequency Frequency f , number of cycles per second Wavelength l, distance for one cycle c speed of the wave λ = f c
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EE475 DR. Kirkman Lecture 2 USC 4 FRS Radio Frequency, Channels, CTSS
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EE475 DR. Kirkman Lecture 2 USC 5 Cell Phone Channels Analog or AMPS 832 channels each 30kHz x 2 http://www.privateline.com/
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EE475 DR. Kirkman Lecture 2 USC 6 Full Duplex Simplex is one way only Half Duplex is two way but only one way at a time
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EE475 DR. Kirkman Lecture 2 USC 7 Spatial Frequency Re-use
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EE475 DR. Kirkman Lecture 2 USC 8 Cell
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EE475 DR. Kirkman Lecture 2 USC 9 Cell Phone Users 50 to 75% of US households subscribe to cellular services. (2003 data) Los Angeles is 68% 3.1 million Households x 68% = 2.1 million Cellular users in LA county’s 4000sq miles 527 users / sq mile
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EE475 DR. Kirkman Lecture 2 USC 10 Multiple Access Polarization TDMA T1 ALOHA Spread Spectrum CDMA OFDM
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EE475 DR. Kirkman Lecture 2 USC 11 Polarization EM Waves are polarized Vertical Horizontal Circular RHCP, LHCP Antennas and Receivers can distinguish
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Lecture2 - Wireless Communications Multiple Access Modes...

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