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Multiinput multioutput (MIMO) technology may be used to increase the wireless transmission rate without increasing transmission power or bandwidth. The complex detection and channel estimation algorithm are often used to achieve an acceptable performance. In this paper, irregular low density parity check (LDPC) codes are well combined with the zero-forcing (ZF) detection algorithm, leading to a novel soft-decision detection and channel estimation scheme. In particular, the implementation complexity is significantly decreased since most likely the channel estimator works without pilots, while the detector decouples a multidimensional symbol detection into multiple one-dimensional symbol detections. Simulation results show that the performance of the proposed system may be greatly improved compared with that of system with convolutional code.