This paper presents a novel architecture of a soft MIMO detector. The proposed architecture is composed of a first block in charge of the calculation of the Euclidean distances. The second one is dedicated to the exchange of information inside the detector over a larger Joint Factor Graph. Thanks to an appropriate parallelism level, the associated architecture enables efficient exchanges of information. Therefore, it promotes a good trade-off between error rate performance and computational complexity which leads to decrease the latency of such receivers.