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A novel solution for reducing the mutual coupling between two closely packed Planar inverted-F antennas (PIFAs) positioned on a compact ground plane is presented. A single miniaturised convoluted slit with optimised dimensions is introduced between the two PIFAs. The presence of the slit leads to a significant reduction of the mutual coupling in the antennas' operation frequency band. The proposed...
A novel technique for reducing the electromagnetic coupling between closely spaced MIMO antenna arrays on a compact ground plane is presented. The proposed ground plane introduces pairs of miniaturised convoluted slits between two PIFAs resulting in a significant reduction of the mutual coupling within their operating frequency band. The proposed slits have a small footprint and are positioned close...
Diversity-multiplexing tradeoff (DMT) of asymmetric two-user full-duplex cooperative multiple-access (CMA) channels with multiple-antenna terminals is studied. The channel is asymmetric in the sense that the users are not restricted to have the same multiplexing and diversity gains. Using the network capacity cut-set bound, we first derive the DMT upper bounds of a general K-user CMA channel. Following...
This paper addresses a novel quasi maximum a posteriori (MAP) estimation algorithm for multiple frequency offsets in distributed multiple inputs and multiple outputs (MIMO) system in the presence of prior information about frequency offsets. In this paper, the prior information is considered and the Cramer-Rao bound (CRB) for the problem at hand is derived. Additionally, taking advantage of prior...
This paper addresses maximum a posteriori (MAP) estimation algorithm for multiple frequency offsets in distributed multiple inputs and multiple outputs (MIMO) system in the presence of prior information about frequency offsets. In this paper, the prior information is considered and the Cramer-Rao bound (CRB) for the problem at hand is derived. Additionally, taking advantage of prior information, the...
In this article, a novel dual codebook based multi-user multiple-input multiple-output (MU-MIMO) precoding and scheduling scheme with limited feedback for downlink transmission is proposed. The proposed dual codebook based MU-MIMO scheme utilizes the first codebook for limited feedback and the second codebook for scheduling and precoding for multiple users at the BS. This paper explores a simplified...
In this paper, we propose a noncoherent space-frequency (SF) code for multiple-input-multiple-output (MIMO) orthogonal-frequency-division-multiplexing (OFDM) systems for broadband wireless communications. The proposed noncoherent SF code matrix is constructed as a combination of a noncoherent SF code matrix and a differential modulation matrix. Comparing to noncoherent SF codes and differential SF...
In this paper, we focus on noncoherent space-frequency (SF) coded multiple-input-multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM) systems. Based on OFDM subcarrier grouping, a group-based unitary space- frequency code is proposed and the effect of grouping on system performance is studied. Comparing to the coding scheme without grouping, which implements SF coding among all the...
In this paper, we propose a space-time coding and carrier block spreading based multiple-input-multiple-output (MIMO) orthogonal-frequency-division-multiplexing (OFDM) system. The proposed system exploits the potential spatial and frequency diversity of MIMO systems in frequency-selective fading environments through a two-stage procedure. In the first stage, we use space-time coding to exploit the...
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