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This paper considers a scenario for multi-input multi-output (MIMO)communication systems when perfect channel state information at the transmitter(CSIT) is given while the equivalent channel state information at the receiver(CSIR) is not available. Such an assumption is valid for the downlinkmulti-user MIMO systems with linear precoders that depend on channels to allreceivers. We propose a concept called dual systems with zero-forcing designsbased on the duality principle, originally proposed to relate Gaussianmulti-access channels (MACs) and Gaussian broadcast channels (BCs). For thetwo-user N*2 MIMO BC with N antennas at the transmitter and two antennas ateach of the receivers, we design a downlink interference cancellation (IC)transmission scheme using the dual of uplink MAC systems employing IC methods.The transmitter simultaneously sends two precoded Alamouti codes, one for eachuser. Each receiver can zero-force the unintended user's Alamouti codes anddecouple its own data streams using two simple linear operations independent ofCSIR. Analysis shows that the proposed scheme achieves a diversity gain of2(N-1) for equal energy constellations with short-term power and rateconstraints. Power allocation between two users can also be performed, and itimproves the array gain but not the diversity gain. Numerical resultsdemonstrate that the bit error rate of the downlink IC scheme has a substantialgain compared to the block diagonalization method, which requires globalchannel information at each node.

Multi-Antenna System Design with Bright Transmitters and Blind Receivers