Mobile Communications Chapter 2: Wireless Transmission

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Effects of mobility • Channel characteristics change over time and location – signal paths change – different delay variations of different signal parts – different phases of signal parts quick changes in the power received (short term fading) • Additional changes in – distance to sender – obstacles further away slow changes in the average power received (long term fading) power Mobile Communications SS2003 short term fading long term fading t
• Multiplexing in 4 dimensions – space (si ) – time (t) – frequency (f) – code (c) • Goal: multiple use of a shared medium • Important: guard spaces needed! Multiplexing channels k i s 1 k 1 Mobile Communications SS2003 c k 2 k 3 k 4 k 5 k 6 t s 3 c f s 2 t c f t f
Page 1 and 2: Mobile Communications Chapter 2: Wi
Page 3 and 4: Frequencies for mobile communicatio
Page 5 and 6: Signals I • physical representati
Page 7 and 8: A [V] • Different representations
Page 9 and 10: Antennas: simple dipoles • Real a
Page 11 and 12: • Grouping of 2 or more antennas
Page 13 and 14: Signal propagation • Propagation
Page 15: • Signal can take many different
Page 19 and 20: t Time multiplex • A channel gets
Page 21 and 22: • Each channel has a unique code
Page 23 and 24: digital analog demodulation radio c
Page 25 and 26: Advanced Frequency Shift Keying •
Page 27 and 28: • BPSK (Binary Phase Shift Keying
Page 29 and 30: Hierarchical Modulation • DVB-T m
Page 31 and 32: i) iii) dP/df dP/df Effects of spre
Page 33 and 34: DSSS (Direct Sequence Spread Spectr
Page 35 and 36: FHSS (Frequency Hopping Spread Spec
Page 37 and 38: FHSS (Frequency Hopping Spread Spec
Page 39 and 40: Frequency planning I • Frequency
Page 41: Cell breathing • CDM systems: cel

Mobile Communications Chapter 2: Wireless Transmission

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