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How to calculate the symmetric information rate (SIR) for continuous phase channels is given. This problem has traditionally been viewed highly complicated due to nonlinearity of the modulation. Through the simulated SIR it can be observed that using the continuous phase modulation (CPM) in a multiple antenna system (MIMO) will likely produce both high performance and high throughput. As the optimum CPM MIMO demodulation has a significant complexity, the BLAST architecture is applied and simulation results are provided.