Detection of colliding users in OFDM based Random Access Networks
- Resource Type
- Conference
- Authors
- Lourenco, Alexandre; Souto, Nuno; Dinis, Rui
- Source
- 2011 IEEE EUROCON - International Conference on Computer as a Tool EUROCON - International Conference on Computer as a Tool (EUROCON), 2011 IEEE. :1-4 Apr, 2011
- Subject
- Computing and Processing
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Density estimation robust algorithm
OFDM
Receivers
Frequency response
Channel estimation
Throughput
MIMO
iterative detection
packet collisions
cross-layer optimization
- Language
Whenever there is a collision involving several transmitted packets, the traditional approach for MAC (Medium Access Control) protocols is to discard all packets involved and request their retransmission, with a consequent loss in the overall throughput. Based on conventional Multiple Input Multiple Output (MIMO) techniques, a multipacket detector for OFDM schemes (Orthogonal Frequency Division Multiplexing) which does not discard the packets involved in a collision has been recently proposed. One of the major problems in resolving collisions using the multipacket detector is to discover how many and which users were transmitting. In this paper we will present a method to solve this problem.