SLIDE 22 Achievable Delivery Time
Example: 3 users, σ = 2 Unicast: {W1, W2, W3} Multicast: {W12, W13, W23}
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Scheme based on superposition coding, power control, and successive decoding
22
r1 + 2 · rsym ≤ α1 r1 + r2 + 3 · rsym ≤ α2 r1 + r2 + r3 + 3 · rsym ≤ α3
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Symmetric multicast
r12 = r13 = r23 = rsym
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rsym = min ⇢α1 − r1 2 , α2 − (r1 + r2) 3 , α3 − (r1 + r2 + r3) 3
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Topological holes Free non-content rates multicast message (subpacket) size
τ lb(r) = 1 rsym · 1 3
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max rsym, min τ lb(r)
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