1. An equalizing structure for a receiving device of a wireless communication system, in which two or more transmit signals transmitted in parallel from one or more transmitters are received in received signal vectors representing two or more received data streams, the signals including information modulated onto carrier signals according to a modulation scheme, wherein all possible transmit signals are represented by candidate constellation values in the signal constellation of the modulation scheme, the structure comprising: a metric value calculator configured to calculate metric values using absolute value calculations of a difference of the received signal vectors and the product of channel estimation values with candidate signal vectors, each candidate signal vector including a candidate constellation value for each of the two or more transmit signals, said absolute value calculations using an absolute value function as an approximation of a square function used in a calculation of a norm; and a list maximum likelihood detector configured to detect one of the candidate signal vectors having a minimum Euclidean distance to a respective receive signal vector as a most likely transmit signal vector based on metric values.