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Cooperative MIMO (Multiple Input Multiple Output) allows multiple nodes to emulate antenna arrays and transmit or receive cooperatively. This has the ability to increase the capacity for future wireless communication systems and it is particularly suited for Ad Hoc networks. In this study, based on our analysis of the Shannon capacity limit of cooperative MIMO transmission, we have derived an optimal...
This paper studies the receiver structure of double STTD system with 4×2 antenna configuration. A new scheme of adaptive power allocation for double STTD is proposed, which minimizes the mean BER of double STTD system. Simulation results show that the adaptive power allocation scheme outperforms significantly traditional equal power allocation for double STTD system.
Multiuser multiple-input multiple-output (MIMO) downlink (DL) transmission schemes experience both multiuser interference (MUI) as well as inter-antenna interference. However, instead of treating all the users jointly as in zero-forcing (ZF) multiuser transmission techniques, the investigated singular value decomposition (SVD) and geometric mean decomposition (GMD) assisted DL multiuser MIMO systems...
In cooperative communication single antenna mobiles can share their antennas to improve communication links and increase channel capacity. Node cooperation generates a virtual multiple-antenna system which attains close to optimal multiple input multiple output (MIMO) gains. At the same time, power line communication (PLC) offers stable high data rate for indoor communications, and also benefits from...
This paper investigates the sum-rate capacity of a multi-user broadcast channel (BC) assuming that users have different transmit correlation matrices. The sum-rate capacity of two-user BC has recently been investigated. As an extension of the two-user BC case, we analyze the sum-rate capacity of a multi-user BC. It is shown by means of upper-bound analysis that the sum-rate capacity of a correlated...
Four utility-based criteria are considered to study dynamic resource allocation in Multiple Input Multiple Output - Orthogonal Frequency Division Multiple Access (MIMO-OFDMA) multiuser cellular systems. In these criteria, two generalized bargaining strategies, GNBS and KSBS, are used to emphasize different levels of user fairness, while the criteria of utilitarian and egalitarian are briefly discussed...
This paper considers power allocation in spatially-correlated dual-hop multiple-input multiple-output (MIMO) relay channels under power constraint for each hop channel. The proposed scheme allocates the transmit power considering the spatial correlation as well as the average signal-to-noise ratio (SNR) of dual-hop MIMO relay channels. By means of upper-bound analysis, the proposed scheme can minimize...
In this paper some preliminary results of power allocation strategy in downlink cooperative MIMO applied to multi-carrier cellular systems are addressed and evaluated. The system model considers multi-antenna base stations communicating with single-antenna terminals simultaneously and the outage probability is evaluated for a given target rate tuple. Besides, optimal power allocation over the carriers...
The orthogonal frequency division multiple access (OFDMA) is widely used for its characteristics of high data transmission rate and the flexibility of bandwidth allocation. In this paper, an equivalent SISO model for the MIMO STBC system was presented, and a Multi-user multirate adaptive sub-carrier allocation scheme was proposed also. We apply the algorithm to the OFDMA. The simulations results show...
The problem of multiuser multiplexing with a MIMO sub system for each individual user is considered. We demonstrate that the capacity performance of the null space based spatial multiplexing schemes can be improved with iterative power allocation within the iterative design process. We considered water-filling based local and global power allocation and demonstrate that both schemes outperform the...
Promising performance of multiple-description coding (MDC) as a suitable video decomposition for MIMO (multiple-input-multiple-output) wireless transmission, reported previously by a number of authors, is further enhanced in this paper by investigating power allocation in MIMO systems that employ singular value decomposition (SVD). Inspired by the water-filling power allocation strategy, results demonstrate...
In this paper, an improvement of the RA (Rate Adaptive) algorithm with alterable allocation step is proposed. Considering of the requirement on system bit error rate and the restriction on allocated bits in each channel, we compare the performance between the improved algorithm and the traditional RA algorithm. Simulation results show that the computational complexity of the proposed RA algorithm...
This paper presents a balanced power control scheme for the uplink of cellular MIMO system. The problem of coordinating power consumption reduce with raise in capacity simultaneously is formulated and an efficient algorithm with good performance is derived. Convex optimization method is used to solve the question. In this paper, an adaptive power allocation scheme is proposed by using interior-point...
Waterfilling enables a dramatic increase in capacity of multiple antenna systems, but requires perfect knowledge at transmitter.When a finite discrete rate is available, this algorithm is no more optimal since the interest lies in maximizing the sum discrete-rate. In this paper, motivated by a feedback reduction, we introduce a transceiver that partially decouples the channel into parallel subchannels...
The development of intelligent resource management algorithms has been recently identified as a key technology for exploiting potential system diversity and improving power-spectral efficiency in wireless communication systems, as well as high-performance physical-layer techniques to provide high throughput, efficient resource use, and aggressive multiple access. In this paper, we propose an adaptive...
Some communication applications, like multimedia, deliver data of different importance classes allowing unequal error protection (UEP) levels. In this paper, a multiple-input multiple-output (MIMO) system using orthogonal frequency division multiplexing (OFDM) is considered with a new UEP bit-loading algorithm based on the non-UEP algorithm by Chow, Cioffi, and Bingham. In the proposed bit-loading...
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