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This study proposes a coordinated dynamic spectrum access (DSA) scheme for LTE based on cognitive radio (CR) technology, where a central entity, a Spectrum Policy Server (SPS), performs the spectrum management in a LTE multi-operator heterogeneous network (HetNet). More specifically, the scenario analyzed is based on a system deployment formed by two Mobile Network Operators (MNOs), each operating a macro cell network and a pico cell network. The spectrum allocation for macro base stations (BSs) is fixed, as it is the case in current deployments, while the spectrum for pico BSs is shared among operators and allocated dynamically. Increased throughput with high spectrum efficiency is demonstrated on this paper and simulation results for this scenario are presented.