  This paper proposes a linear interference alignment (IA) scheme which can be
used for uplink channels in a general multicell multiuser MIMO cellular
network. The proposed scheme aims to align interference caused by signals from
a set of transmitters into a subspace which is established by the signals from
only a subset of those transmitters, thereby effectively reducing the number of
interfering transmitters. The total degrees of freedom (DoF) achievable by the
proposed scheme is given in closed-form expression, and a numerical analysis
shows that the proposed scheme can achieve the optimal DoF in certain scenarios
and provides a higher total DoF than other related schemes in most cases.
