Changes between Version 1 and Version 2 of IEEE2010_Drexel

Timestamp:

Apr 22, 2011, 1:22:34 PM (13 years ago)

Author:

jdavis

Comment:

--

IEEE2010_Drexel

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-ydd
+= ALOHA with Collision Resolution (ALOHA-CR): Theory and Software Defined Radio Implementation = 
+
+Authors: X. Liu, J.Kountouriotis, A.P. Petropulu, K.R. Dandekar
+
+== Abstract ==
+A cross-layer scheme, namely ALOHA With Collision Resolution (ALOHA-CR), is proposed for
+high throughput wireless communications in a cellular scenario. Transmission occurs in a time-slotted
+ALOHA-type fashion with a caveat: simultaneous transmissions of two users can be successful. The
+wireless channel is assumed to be flat fading and constant over the duration of one time slot. A user i
+with a non-empty queue transmits a packet with some probability p in the beginning of each time slot,
+after waiting for a random time interval 
+i. If more than two users transmit in the same slot, the collision
+cannot be resolved, the packets are discarded and the users are asked to retransmit at a later time. If only
+one user transmits, the transmitted packet is recovered with some probability, depending on the state
+of the channel. If two users transmit, the collision can be separated and the packets recovered by first
+oversampling the collision signal and then exploiting independent information about the two users that
+is contained in the signal polyphase components. The properties of the user delays 
+i’s are determined
+so that the probability of user separation is maximized. The ALOHA-CR throughput is derived under
+the infinite backlog assumption, i.e., the network users always have data in their queues, and also under
+the assumption of finite backlog. In the infinite backlog assumption, the optimal contention probability
+is calculated, which maximizes the system throughput. In the finite backlog assumption, the region of
+contention probability is determined based on the packet arrival rate. Queuing delay of network users
+are also derived. The performance of ALOHA-CR is demonstrated on a WARP testbed containing five
+software defined radio nodes. The testbed results indicate ALOHA-CR leads to significant increase in
+throughput and reduction of service delays.
+{{{
+        {Liu:2010,
+        Author = {X. Liu, J. Kountouriotis, A.P. Petropulu, K.R. Dandekar},
+        Title = {ALOHA With Collision Resolution (ALOHA-CR): Theory and Software Defined Radio Implementation},
+        Year = {2010}}