Changes between Version 2 and Version 3 of IEEE2010_Drexel
- Timestamp:
- Apr 22, 2011, 1:23:33 PM (13 years ago)
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IEEE2010_Drexel
v2 v3 9 9 wireless channel is assumed to be flat fading and constant over the duration of one time slot. A user i 10 10 with a non-empty queue transmits a packet with some probability p in the beginning of each time slot, 11 after waiting for a random time interval 12 i. If more than two users transmit in the same slot, the collision 11 after waiting for a random time interval. If more than two users transmit in the same slot, the collision 13 12 cannot be resolved, the packets are discarded and the users are asked to retransmit at a later time. If only 14 13 one user transmits, the transmitted packet is recovered with some probability, depending on the state 15 14 of the channel. If two users transmit, the collision can be separated and the packets recovered by first 16 15 oversampling the collision signal and then exploiting independent information about the two users that 17 is contained in the signal polyphase components. The properties of the user delays 18 i’s are determined 16 is contained in the signal polyphase components. The properties of the user delays i’s are determined 19 17 so that the probability of user separation is maximized. The ALOHA-CR throughput is derived under 20 18 the infinite backlog assumption, i.e., the network users always have data in their queues, and also under