LDPC code performance and optimum code rate for Contention Resolution Diversity ALOHA

In this paper we investigate several central aspects of using the unslotted Contention Resolution Diversity ALOHA (CRA) scheme with Successive Interference Cancellation (SIC). A model for the co-user-interference under consideration of time-, phase- and frequency-offsets is presented. With this model, the throughput and Packet Loss Ratio (PLR) performance of CRA is investigated when using Low Density Parity Check (LDPC) codes, showing that CRA can achieve remarkable performance also in these conditions. Moreover, the throughput and PLR gain of CRA in presence of power unbalance is studied, showing that significant gains can be expected. Following this, the central question is answered which channel rates optimize the goodput of CRA, showing that for CRA with few replicas a low, robust channel rate achieves optimum while for high numbers of replicas a high channel rate performs optimum. Finally an investigation of the interference distribution of an asynchronous TDMA scheme with replicas and the SIC operations in it are shown.

[1]  Norman Abramson,et al.  The ALOHA System-Another Alternative for Computer Communications , 1899 .

[2]  Mohamed-Slim Alouini,et al.  Digital Communication Over Fading Channels: A Unified Approach to Performance Analysis , 2000 .

[3]  Marco Chiani,et al.  High Throughput Random Access via Codes on Graphs: Coded Slotted ALOHA , 2011, 2011 IEEE International Conference on Communications (ICC).

[4]  Riccardo De Gaudenzi,et al.  Contention Resolution Diversity Slotted ALOHA (CRDSA): An Enhanced Random Access Schemefor Satellite Access Packet Networks , 2007, IEEE Transactions on Wireless Communications.

[5]  Gianluigi Liva,et al.  Graph-Based Analysis and Optimization of Contention Resolution Diversity Slotted ALOHA , 2011, IEEE Transactions on Communications.

[6]  Christian Kissling.  Performance Enhancements for Asynchronous Random Access Protocols over Satellite , 2011, 2011 IEEE International Conference on Communications (ICC).

[7]  Lawrence G. Roberts,et al.  ALOHA packet system with and without slots and capture , 1975, CCRV.

[8]  Marco Chiani,et al.  Graph-Based Random Access for the Collision Channel without Feedback: Capacity Bound , 2011, 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011.

[9]  Riccardo De Gaudenzi,et al.  Advances in Random Access protocols for satellite networks , 2009 .

[10]  Matteo Berioli,et al.  Sliding window-based Contention Resolution Diversity Slotted ALOHA , 2012, 2012 IEEE Global Communications Conference (GLOBECOM).

[11]  Christian Kissling,et al.  On the integration of random access and DAMA channels for the return link of satellite networks , 2013, 2013 IEEE International Conference on Communications (ICC).

[12]  Christian Kissling,et al.  On the Stability of Contention Resolution Diversity Slotted ALOHA (CRDSA) , 2011, 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011.

[13]  Mohamed-Slim Alouini,et al.  Digital Communication over Fading Channels: Simon/Digital Communications 2e , 2004 .