The multi-relay cooperative communication system model in rectangular tunnel based on multimode channel model was established. and the channel capacity calculation formulas of multi-relay cooperative communication system in amplify and forward mode and decode and forward mode were given. Under the circumstance of limited power in tunnel. optimal power allocation method of amplify and ... https://www.bekindtopets.com/quick-offer-Kansas-City-Chiefs-2-Piece-Stemless-Wine-Glass-Set-with-Collectible-Box-must-buy/