Random Linear Network Coding for Time-Division Duplexing: Field Size Considerations
Author(s)Medard, Muriel; Lucani, Daniel Enrique; Stojanovic, Milica
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We study the effect of the field size on the performance of random linear network coding for time division duplexing channels proposed in . In particular, we study the case of a node broadcasting to several receivers. We show that the effect of the field size can be included in the transition probabilities of the Markov chain model of the system. Also, an improved upper bound on the mean number of coded packets required to decode M original data packets using random linear network coding is presented. This bound shows that even if the field size is 2, i.e. we perform XORs amongst randomly selected packets from the pool of M original ones, we will need on average at most M + 2 coded packets in order to decode. Thus, there will be only a very small degradation in performance if M is large. We present numerical results showing that the mean completion time of our scheme with a field size of 2 is close in performance to our scheme when we use larger field sizes. We also show that as M increases, the difference between using a field size of 2 and larger field sizes decreases. Finally, we show that we can get very close to the optimal performance with small field sizes, e.g. a field size of 4 or 8, even when M is not very large.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Lucani, D.E., M. Medard, and M. Stojanovic. “Random Linear Network Coding for Time-Division Duplexing: Field Size Considerations.” Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE. 2009. 1-6. ©2009 IEEE.
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INSPEC Accession Number: 11171036