Quiz Review

1
Quiz Review

• Major topics
• Overview of wireless systems / standards
• Cellular concepts (frequency reuse,
  interference, user capacity)
• Propagation
• Modulation
• Diversity
• Multiple access (FDMA, TDMA, CDMA, OFDMA)

2
Wireless Systems/Standards

• Cellular
• 2G (GSM), 3G (CDMA2000, UMTS/W-CDMA,1xEVDO),
• 4G (LTE)
• WiMAX (802.16)
• WLANs
• 802.11a/b/g/n
• PAN
• Bluetooth

3
Cellular Concepts

• Frequency reuse / cell cluster size
• FDD, TDD
• S/I or SINR
• Blocking probability, trunking efficiency
• Effect of sectorization
• Performance measure?

4
Propagation

• Distance attenuation (path loss)
• Compute transmit power given dB loss
• Shadowing
• Multipath
• Rayleigh fading
• Doppler shift (vf/c)
• Narrowband vs wideband signals
• Coherence band, frequency diversity
• Delay spread

5
Modulation

• FSK, ASK, PSK, QPSK, QAM
• Power vs bandwidth efficiency
• Shannon formula
• Signal constellation
• Nyquist symbol rate, intersymbol
  interference,excess bandwidth
• OFDM

6
Diversity

• Forms macro, frequency, space, time, path, user
• Time diversity error control coding
• Selection diversity (HW problem 2)

7
Multiple Access

• FDMA, TDMA, CDMA
• Correlation receiver
• Direct-Sequence Spread spectrum
• Processing gain
• Interference vs bandwidth tradeoff
• Frequency hopping
• OFDMA