Paper Info
Title
MIMO slotted ALOHA systems with collision resolution and truncated HARQ transmission and combining.
Abstract
In this paper, we investigate throughput and delay enhancement for two multi-user multiple-input multiple-output (MIMO) systems one with space-time block coding (STBC), the other with spatial multiplexing (SM) at the transmitter. Users operate using the slotted ALOHA (SA) protocol to access the wireless channel resulting in a high probability of collision. For both systems, we consider the uplink scenario, and we propose to recover the collided packets with spatial successive interference cancelation (SSIC) and a protocol for retransmission and combining of unsuccessfully received collided packets applying a truncated Hybrid Automatic Repeat reQuest (HARQ) scheme. For the first system, we propose to use channel realizations of collided packets as different signatures to separate them. Moreover, we propose a solution for the problem when the received powers are comparable. For this system, we note that the orthogonality of the STBC matrix allows the use of a simple linear processing step for the initialization of SSIC. For the SM multi-user system, the separation of collided packets is based on V-BLAST processing and SSIC. We also propose how to combine retransmitted packets. For both systems, we evaluate the block error rate, the throughput, and the delay. A comparison is done with the single-user case and with other receivers proposed in the literature.
Year
DOI
Venue
2016
10.1007/s12243-015-0483-6
Annales des Télécommunications
Keywords
Field
DocType
Multi-user detection, Slotted ALOHA, Space-time coding, Successive interference canceller, Spatial multiplexing, Throughput
Hybrid automatic repeat request,Block Error Rate,Aloha,Computer science,Retransmission,MIMO,Electronic engineering,Throughput,Space–time block code,Spatial multiplexing
Journal
Volume
Issue
ISSN
71
3-4
1958-9395
Citations 
PageRank 
References 
0
0.34
12
Authors
3
Name
Order
Citations
PageRank
Nejah Missaoui121.11
Inès Kammoun21614.53
Mohamed Siala372.30