發送短信 : Co-existence with ARQ-based primary system through cooperate-and-access spectrum sharing

 _____       ___      ______     ___      ______  
|  __ \\    / _ \\   /_   _//   / _ \\   /_   _// 
| |  \ ||  | / \ ||  `-| |,-   / //\ \\  `-| |,-  
| |__/ ||  | \_/ ||    | ||   |  ___  ||   | ||   
|_____//    \___//     |_||   |_||  |_||   |_||   
 -----`     `---`      `-`'   `-`   `-`    `-`'