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Soft-input soft-output (SISO) sphere decoding is applied to multiple-input multi-output (MIMO) systems to offer good bit error rate (BER) performance but at high complexity. To reduce this computational complexity, we propose a novel hybrid enumeration strategy for such decoding that dynamically determines the candidate list; moreover, this strategy uses a new node enumeration based on concentric...
In this paper, we consider the design of multi-resolution non-coherent multiple-input multiple-output (MIMO) systems that enable Unequal Error Protection (UEP). A method for designing multi-layer non-coherent Grassmannian constellations is introduced. Specifically, the proposed method yields multi-layer constellations that are amenable to a natural set partitioning strategy. The resulting subsets...
This paper presents sparse Bayesian learning (SBL)-based estimation schemes for an approximately sparse wireless multipath channel impulse response (MCIR) in a space-time trellis coded (STTC) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. The proposed schemes consider space-time trellis encoding over consecutive OFDM symbols and employ the multiple...
In this paper, we design a signal alignment scheme that exploits orthogonality of spatial signalling dimensions in the multiple-input multiple-output (MIMO) Y channel, where three users send messages to each other through a relay. The antenna configuration in the original MIMO Y channel system imposes limitations on controlling the minimum distance between signaling points representing network coded...
Low capacity, bulky size and wiring limitations of the conventional wireless multi-channel electroencephalography (EEG) system restrict its use as brain neuromonitoring system. To reduce such restriction, this paper proposes an EEG system based on multi-input multi-output (MIMO) technique and polar coded data. In the proposed system, all the channels are sent and received simultaneously, while the...
In this paper, we present unified Hardware (HW)/Software (SW) framework for efficient system level simulation of complex circuits, particularly high throughput wireless communication system. The proposed framework include a unified methodology covering both of system level simulation (e.g. MATLAB or C/C++) and physical level verification (e.g FPGA). It allows performing fast HW/SW evaluation in the...
In a multichannel system, the transmitter can perform precoding techniques to alleviate the effects of fading and interference. However, the precoding transformation matrix usually results in high peak to average power ratio (PAPR). In order to avoid inefficiently operating the power amplifier, for a precoded multi-input multi-output (MIMO) system, we consider using a PAPR reduction method based on...
State-of-the-art channel coding schemes promise data rates close to the wireless channel capacity. However, efficient link adaptation techniques are required in order to deliver such throughputs in practice. Traditional rate adaptation schemes, which are reactive and try to “predict” the transmission mode that maximizes throughput based on “transmission quality indicators”, can be highly inefficient...
This paper studies the fairness optimization of dynamic multiuser multicarrier allocation in the cellular downlink of MIMO orthogonal frequency division multiple access (OFDMA) systems. The varying capacity demands of different users motivate the fairness problem. In the resource allocation approaches that maximizing the sum rate or minimizing the total power often leads to poor fairness among users...
Wireless communication systems are dense compositions of signal processing and VLSI technologies. Due to increase in demand of higher data rate and better quality of services, VLSI design and implementation method for wireless communication becomes more challenging. Multiple-input and multiple-output (MIMO) technique is rapidly increasing in the last decade which provides higher throughput at no additional...
This paper presents a novel technique - Multi-Channel Ratio (MCR) Decoding, which aims at providing an anti-jamming wireless communication capability for multi-antenna wireless devices. The basic idea of MCR decoding is to fully leverage the repeated preamble signals and the multi-channel characteristics in MIMO communications to detect and recover the desired transmission signals under constant and...
Recently, many people utilize the smart devices such as smart phones, tablet pad and laptop PC for their ubiquitous lifestyle. Because these devices might be always connected in wireless to the internet, the demands for wireless access is extremely increased according to the rapidly increasing the number of smart devices. To satisfy the request for the wireless connectivity and enhance the average...
A Multiple Input Multiple Output (MIMO) relay assisted wireless communication system encoded with Turbo- VBLAST codes is studied in this paper. Source is equipped with multiple transmit antennas, relay is equipped with multiple transmit as well as receive antennas and destination is also equipped with multiple receive antennas. Turbo encoder encodes the input bits and then QPSK or 16 QAM or 64 QAM...
The space-time coding can provide a diversity gain for the multiple-antenna system while spatial multiplexing provides higher data rates. In this paper we are combining space-time block code (STBC) with spatial multiplexing technique over space to take advantages of both schemes. The transmit antennas are divided into groups, with one of the groups transmitting STBC code given by Alamouti and other...
Lattice reduction aided decoding has been successfully used for signal detection in multiinput and multioutput (MIMO) systems and many other wireless communication applications. In this paper, we propose a novel enhanced Jacobi (short as EJacobi) method for lattice basis reduction. To assess the performance of the new EJacobi method, we compared it with the LLL algorithm, a widely used algorithm in...
In this paper a diagonal cyclotomic space-time coding (DCSTC) transmission scheme for wireless cooperative relay networks is proposed. We consider the full-duplex cooperation which is more spectrally efficient than the half-duplex cooperation. By the combination of multidimensional complex constellation symbols rotation and Hadamard transform, the proposed scheme is capable of achieving full cooperative...
In this paper we propose a system where we divide the group with 2 symbols. The two added symbols are separated by multiplexing and later added using the DE-multiplexing technique. In our propose system a simple Partial Interference Cancelation (PIC) group decoding scheme is used for Double-ABBA Quasi-Orthogonal Space Time Code, which reduces the decoding complexity for the higher order Multiple Input...
In this paper, we separate the symbols in the layered basis and then find the equivalent channel matrix. Based on the equivalent channel matrix we provide the grouping scheme. In our paper, we construct a block wise transmission technique which will achieve the desired code rate and reduce the decoding complexity.
A new space-time block code (STBC) is presented for distributed 4 × 2 multiple-input multiple-output (MIMO) systems. A 2 × 2 full-rate full-diversity (FR-FD) low complexity space-time code, presented by Sezginer and Sari, is employed for two distributed links. Alamouti STBC is applied over the two links to obtain a double layer space-time block code (DLSTBC) providing full diversity in a distributed...
Abstract-In this paper, we proposed an efficient clustering based cooperative transmission strategy for virtual MIMO applied in Ad Hoc system. In the strategy, different encoding schemes are used in intra- and inter-cluster communication as a tradeoff between diversity and multiplexing gain. In decoding, an improved grouped Sphere Decoding (SD) algorithm is proposed for the system described here....
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