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We consider practical two-way communication schemes with blind channel estimation in TDD (time-division duplex) MISO (multi-input single-output) and MIMO (multi-input multi-output) systems. In the MISO system, we show that blind channel estimation only needs to be done at a transceiver equipped with multiple antennas and this estimated channel can be efficiently utilized for both uplink and downlink communication. In the MIMO system, we propose a two-stage communication scheme which begins with uplink transmission using differential space-time block codes and follows with two-way beamforming with blind channel estimation. We demonstrate, through simulations, that the novel schemes possess very good performance and compare them with training-based schemes.