Lect10_Aerial Access(II)

Lect10_Aerial Access(II) - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Aerial Access (II) 10 1
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Outline Duplexing FDD TDD Multiple Access FDMA TDMA CDMA 2
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Frequency Division Duplexing (FDD) Separate frequency channels for TX (mobile station to base station) and RX (base station to mobile station) Each user gets two distinct RX and TX channels RX and TX frequency channels grouped together in separate bands Requires a guard band between TX and RX bands of channels 3 Base Station User 1 f RX 1 TX User 2 2 RX1 RX2 RXn TX1 TX2 TXn RX Band TX Band Guard Band Frequency
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Use a duplexer to isolate between transmitter and receiver (~ 50dB of isolation) TX Noise: Floor noise of TX band degrades the sensitivity of the RX Duplexer reduces TX noise desensitization to RX TX Signal: Attenuate PA output signal to guard against the RX LNA from edging near compression Duplexer Issues: High insertion loss (IL ~ 2-3dB) 30-50% of PA power is wasted Degrades LNA NF Not enough isolation 4 LNA PA Ins. Loss
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect10_Aerial Access(II) - ECE 620 Introduction to RF...

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