TAILIEUCHUNG - Opportunistic Communication and Multiuser Diversity

Channel diversity: frequency diversity via Rake combining, time diversity via interleaving and coding, macro-diversity via soft handoff, transmit/receive antenna diversity. | 6. Opportunistic Communication and Multiuser Diversity Fundamental Feature of Wireless Channels: Time Variation multipath fading large-scale channel variations time-varying interference Traditional Approach to Wireless System Design Compensates for channel fluctuations. Example: CDMA Systems Two main types of compensating mechanisms: Channel diversity: frequency diversity via Rake combining time diversity via interleaving and coding macro-diversity via soft handoff transmit/receive antenna diversity 2. Interference management: power control interference averaging What Drives this Approach? Main application is voice, with very tight latency requirements. Needs a consistent channel. Opportunistic Communication: A Different View Transmit more when and where the channel is good. Exploits fading to achieve higher long-term throughput, but no guarantee that the "channel is always there". Appropriate for data with non-real-time latency requirements (file downloads, .

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