Patent ID: 9723566
Date: 2017-08-01
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method implemented in a wireless communications system including a first uplink (UL) client device, a second UL client device, a first downlink (DL) client device, and an access point (AP), the method comprising the following steps in this order: a) determining interference alignment (IA) solution between the first and second UL client devices and the first device; b) determining, according to the IA solution, receive filter U wherein the wireless communications system further includes a second DL client device, and wherein step b) comprises the following steps in this order: c) determining first precoder V d) determining first receive filter U e) determining precoder V wherein step c) further comprises: f) letting {acute over (V)} g) for every {right arrow over (V)} h) pairing eigenvectors from V′ i) computing UL stream rate metric for UL streams corresponding to every pair of eigenvectors as R j) arranging the pair of eigenvectors in descending order of the UL stream rate metric; k) picking up top pairs to construct first precoder V 1 and second precoder V 2 of size l) using receive niter vectors ({right arrow over (u)} 0i 1 ,{right arrow over (u)} 0i 2 ) to construct receive filter matrices U 0 1 and U 0 2 and N×N receive filter U 0 =[U 0 1 U 0 2 ]; and delivering streams using the UL steam rate and the DL steam rate.