The basic form of Shannon theorem determines the upper bound of a single link channel capacity. The theorem has been extended for multi-user environment by considering the contributed power of the other transmitters as interference. This has considerably deteriorated the capacity. However, in digital communication, all transmitters transmit from a finite set of symbols. Therefore, identical symbols should assist (or boost) each other rather than being interfering with each other. How to make this possible through a novel coding with massive MIMO is shown. How to construct a downlink system where the required power budget becomes independent of the number of active served terminals is also shown. Moreover, no coordination is required between the receivers. This mutual coding concepts are new and may open the door for new angle for digital communication and massive MIMO.