Joint Linear Filter Design in Multi-User Non-Regenerative MIMO-Relay Systems

Multi-user MIMO MMSE non-regenerative relaying using local channel state information

“…Wireless relays are essential to provide reliable transmission, high throughput, and broad coverage for next generation wireless networks. The http://asp.eurasipjournals.com/content/2012/1/186 MU MIMO communication system, where a single source, a base station (BS), communicates with a group of user terminals (UTs) over a single RN was investigated in [11][12][13][14]. The optimum design of non-regenerative relays for MU MIMO relay systems in [11] is based on sum rate optimization.…”

“…A novel iterative semidefinite programming-based algorithm is used for sum rate maximization. The problem of joint linear optimization of MIMO processing matrices at the RN and at the BS for both downlink (DL) and uplink (UL) in MU non-regenerative MIMO relay systems based on MMSE criterion was investigated in [14]. The resulting MIMO processing matrices are calculated iteratively, the nodes require the knowledge of global CSI, and the solution for one matrix is a function of the other MIMO processing matrix.…”

Joint source and relay design for MIMO multi-relay systems using projected gradient approach

“…In [2,3], the optimal relay amplifying matrix maximizing the mutual information (MI) between the source and destination nodes was derived, assuming that the source covariance matrix is an identity matrix. In [4][5][6], the optimal relay amplifying matrix was designed to minimize the mean-squared error (MSE) of the signal waveform estimation at the destination.…”

“…Recently, multiple-input multiple-output (MIMO) relay communication systems have attracted much research interest and provided significant improvement in terms of both spectral efficiency and link reliability [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Many works have studied the optimal relay amplifying matrix for the source-relay-destination channel.…”

“…All the works in [1][2][3][4][5][6][7][8][9][10][11][12][13][14] considered a single relay node at each hop. In general, joint source and relay precoding matrices design for MIMO relay systems with multiple relay nodes is more challenging than that for single-relay systems.…”