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In multi-user multi-input multi-output (MIMO) systems, multiple timing and frequency offsets may occur in the procedure of synchronization. Conventional MIMO synchronization methods deal with timing and frequency offsets separately. In fact, these methods can not achieve the best performances because the unknown parameters will interfere with each other. In this paper, we propose a joint timing-frequency...
In this paper, we propose a maximum-likelihood (ML) estimation method for synchronization in decode-and-forward (DF) cooperative systems. We focus on the estimation problem of the multi timing and frequency offsets in the second phase, the multiple-input-single-output (MISO) multiple access phase of cooperative communications. Different from the conventional methods which estimate the timing or frequency...
In this paper, we propose a joint user scheduling and precoding scheme in multicell MIMO system. In the proposed scheme, each user feeds back its preferable precoding vector index as well as a scalar to a BS, then the coordinated BSs share all users' feedback and work as a virtual enhanced BS. BSs determine a first user with maximum expected channel gain, and then use its preferable precoding vector...
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 paper, the capacity of joint transmit and receive antenna selection systems is investigated. Due to the difficulty in math, a general and closed-form capacity expression has not been obtained in previous works. In this paper, in terms of capacity maximization, we derive a closed-form upper bound of capacity for joint transmit and receive antenna selection systems. Our capacity bound is general...
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