On the minimum side information of MIMO broadcast channel

Abstract

We introduce a technique to achieve dirty paper coding (DPC) capacity asymptotically with minimum feedback required reported to date in literature. Our approach called interference management, is based on a new multiuser diversity scheme designed for wireless cellular networks. When there are K antennas at the base station with M mobile users in the cell, the proposed technique only requires K integer numbers related to channel state information (CSI) between mobile users and base station. The encoding and decoding complexity of this scheme is the same as that of point-topoint communications. In order to guarantee fairness, a new algorithm is proposed which incorporates interference management into existing GSM standard.

Antenna selection for opportunistic interference management in MIMO broadcast channels

“…For example, in a TDMA system we can use L antennas at the base station for regular TDMA communication since their signal is extremely weak at the receiver of mobile users that are participating in OIM, i.e., they are not interfering with those transmissions. On the other hand, nodes utilizing OIM can affect TDMA receiver but we have shown recently [12] that they can be orthogonalized at the TDMA receiver side using a technique that does not require any channel knowledge. This technique is fundamentally different from beamforming concept which has been described in details in [12].…”

“…On the other hand, nodes utilizing OIM can affect TDMA receiver but we have shown recently [12] that they can be orthogonalized at the TDMA receiver side using a technique that does not require any channel knowledge. This technique is fundamentally different from beamforming concept which has been described in details in [12]. …”

Taking advantage of multi-user diversity in OFDM systems

“…This technique was developed by Wang et al in [5], and is proven to scale similar to DPC capacity in the downlink of wireless cellular systems asymptotically.…”

“…Opportunistic Interference Management (OIM) [5] is a multiuser diversity technique that exploits fading in wireless channels in order to overcome interference. A mobile station (MS) antenna that possesses a strong channel with one base station (BS) antenna, and weak channels with the remaining BS antennas, will be able to receive data from the strong channel while other BS antennas can simultaneously transmit to other users without the need of any active interference management technique due to the good signal-to-interference-plus-noise ratio (SINR).…”