An Upper Bound on Broadcast Subspace Codes
  Linear operator broadcast channel (LOBC) models the scenario of multi-rate packet broadcasting over a network, when random network coding is applied. This paper presents the framework of algebraic coding for LOBCs and provides a Hamming-like upper bound on (multishot) subspace codes for LOBCs. 
Yimin Pang and Thomas Honold
cs.IT math.AG math.IT