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In this two part paper we consider a wireless network in which a sourceterminal communicates with a destination and a relay terminal is occasionallypresent in close proximity to the source without source's knowledge, suggestingoblivious protocols. The source-relay channel is assumed to be a fixed gainAWGN due to the proximity while the source-destination and therelay-destination channels are subject to a block flat Rayleigh fading. Aperfect CSI at the respective receivers only is assumed. With the averagethroughput as a performance measure, we incorporate a two-layer broadcastapproach into two cooperative strategies based on the decode-and-forward scheme- Sequential Decoded-and Forward (SDF) in part I and the Block-Markov (BM) inpart II. The broadcast approach splits the transmitted rate into superimposedlayers corresponding to a "bad" and a "good" channel states, allowing betteradaptation to the actual channel conditions In part I, the achievable rateexpressions for the SDF strategy are derived under the broadcast approach formultiple settings including single user, MISO and the general relay settingusing successive decoding technique, both numerically and analytically.Continuous broadcasting lower bounds are derived for the MISO and an obliviouscooperation scenarios.

Broadcast Approach and Oblivious Cooperative Strategies for the Wireless Relay Channel - Part I: Sequential Decode-and-Forward (SDF)