… One advantage of using the virtual channel model in analyzing our proposed multi-user
precoding algorithm lies in the fact that it provides a common space of the transmit eigenvectors …

… as: i) we consider the multiuser case in which each user can only sense and feedback its
own channel, yet the precoding process is a function of all users’ channels; ii) we provide end-…

… in the feedback encoder. The … PRECODING WITH LIMITED FEEDBACK In this section we
present a MU-MIMO scheme that uses linear precoding based on quantized channel feedback. …

… to limited feedback. Here, we compare two different feedback approaches: in the first, users
feed back the best entry of a precoder codebook, and in the second, users provide quantized …

… research was to enable multiuser precoding. This example … precoder of [3]. Figure 5 plots
the overall BER with various levels of feedback, comparing the results to having true channel …

… which include pilot sequences, limited feedback, and precoding. To address this problem, …
the feedback information generation at users and the precoder design at a base station (BS). …

… An optimal feedback scheme is proposed to minimize the outage of the PU link. Motivated
… on precoder design for a CR system, where a secondary MIMO broadcast channel uses the …

… [10] IH Kim, SY Park, DJ Love, and SJ Kim, “Improved multiuser MIMO unitary precoding
using partial channel state information and insights from the Riemannian manifold,” IEEE Trans. …

… The paper is organized as follows: After discussing the channel model in Section II, we
review the concepts of spatial equalization and precoding in Section III. An important aspect for …

… Since the data rate of the feedback channels is often … precoding design: channel estimation,
truncation of the KL transform, quantization of the KL coefficients, and feedback channel …