System and method for early termination in iterative null-space directed singular value decomposition for MIMO

摘要

Embodiments are provided for early termination of an iterative process of determining channel directions and transmissions in multi-user multiple-input and multiple-output (MU-MIMO) communications systems. In an embodiment, a base station or a user equipment (UE) calculates a multi-user channel matrix using a first iteration of a null-space singular value decomposition (SVD) based iterative zero-forcing (I-ZF) algorithm for multi-user MU-MIMO. The base station or UE repeats updating the multi-user channel matrix using a next iteration of the algorithm and the multi-user channel matrix calculated in a previous iteration, until the diagonal elements of the multi-user channel matrix are greater than the off-diagonal elements by a predefined threshold. Upon determining that the diagonal elements are greater than the off-diagonal elements by the predefined threshold, a plurality of transmission signals are calculated using the last updated multi-user channel matrix.

主权项

1. A method for transmitting wireless transmission signals between a network component having a plurality of antennas and multiple stations each having a plurality of antennas, the method comprising:
calculating, by a processor of the network component, a multi-user channel matrix using a first iteration of a null-space singular value decomposition (SVD) based iterative zero-forcing (I-ZF) algorithm for multi-user MIMO (MU-MIMO), wherein the multi-user channel matrix includes a plurality of diagonal elements corresponding to channels for the multiple stations and a plurality of off-diagonal elements corresponding to inter-station interference; until the diagonal elements are greater than the off-diagonal elements by a predefined threshold, repeatedly updating, by the processor of the network component, the multi-user channel matrix using a next iteration of the null-space SVD based I-ZF algorithm and the multi-user channel matrix calculated in a previous iteration of the null-space SVD based I-ZF algorithm; upon determining that the diagonal elements are greater than the off-diagonal elements by the predefined threshold, calculating, by the processor of the network component, the wireless transmission signals using a last updated multi-user channel matrix; and transmitting, by a wireless transmitter of the network component, the wireless transmission signals to the multiple stations based on the last updated multi-user channel matrix.