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Molecular communications (MC) is a promising paradigm which utilizes molecules to implement communication among nano-machines. Cooperative relaying strategies can be used to extend communication distance and achieve reliable remote communications. In this paper, a two-hop diffusion-based molecular communication with three nano-machine nodes is considered. To mitigate the drawback of traditional cooperative...
In this paper, an accurate QR decomposition based link level performance abstraction technique for a multi-input multi-output iterative receiver is proposed. The post-detection SNR values for an iterative receiver are estimated using QR decomposition of the channel matrix. The effect of channels on the received SNR is realized by scaling the signal in accordance with the leading diagonal elements...
Multilayer coding represents an appealing solution for the broadcasting of common data when we want to ensure the receivers decode the signal with different distortion levels depending on the quality of the received signal. In addition, the combination of digital and analog techniques to encode the source data allows to solve the limitation of these approaches when they are applied separately. In...
Molecular communication via diffusion (MCvD) is a new research area that considers the communication using messenger molecules in a diffusive fluidic channel. In this area, various modulation methods have been proposed to overcome the problems in the channel, especially the inter symbol interference (ISI). However, these methods are generally considered and tested for the channels that do not change...
In this paper, non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC) technique for downlink channel of next generation wireless network and its security issues are discussed. In NOMA, signals for all user equipment (UEs) are superimposed before transmission and then decoded at each UE implementing SIC. SIC relies on decoding and subtracting the signals in sequence until...
Differential spatial modulation (DSM) is a novel attractive alternative technique for coherent spatial modulation (CSM) without channel state information (CSI) at the receiver. In this paper, iterative detection is firstly employed to improve the performance of DSM schemes. With the Hamming distance of two matrices reduced to the sum of simple elements, a lowcomplexity iterative detection scheme for...
With the development of high-speed trains (HST), efficient and reliable communication services in high mobility scenarios have become an urgent demand. As one of the strong candidates in 5G wireless system, polar codes along with its optimized design should also be investigated under high mobility scenarios. In this paper, a scheme of hash-concatenated polar codes is proposed to reduce the false alarm...
It is known that by extracting log-likelihood ratio (LLR) values from the received MIMO signals, a MIMO detector is able to exchange a posteriori soft information with a channel decoder to improve the error performance. A minimum mean-square error with parallel interference cancellation (MMSE-PIC) detector is considered to be a practical MIMO detector, but the computational complexity for the LLR...
We consider the following variant of the index coding problem. A transmitter wishes to communicate several messages, each of which is k bit long, to multiple informed receivers over a noisy broadcast link. Each informed receiver already knows some of the messages a priori, which is called its side information, and demands to know the rest of the messages. However, unlike in an index coding problem,...
The capacity of the AWGN broadcast is achieved by superposition coding, but superposition of individual coded modulations does not in general obey a predefined constellation. We propose a coded modulation broadcast with strict channel input modulation constraint via multilevel coding (MLC). For a degraded broadcast channel, conditions of optimality of the multilevel decomposition of a superposition...
Non-orthogonal multiple access as a promising technology is expected to support massive connectivity in the next generation. In this paper, we propose a novel perfect energy spread transform (P-EST) based multiple access scheme, which perfectly spreads a symbol energy all over the frequency-domain and time-domain increasing the diversity gain of the system. The parameters of the proposed scheme can...
Due to the inherent intersymbol interference (ISI), the detection for faster-than-Nyquisy (FTN) signaling is long considered to be a challenging problem. In this paper, we study three equalization and detection schemes in terms of their performance and computational complexity for FTN signaling system. The first one is the widely employed optimal maximum a posterior (MAP) equalization implemented...
This paper proposes a 2-Phase Shift Keying (2-PSK) based modulation scheme for Image Sensor Communications. The considered communication system on a car uses a couple of LED light sources for transmitting data (either two rear light sources or two front light sources) and a typical-frame-rate camera (i.e. 30fps frame rate) which is either a global shutter camera or a rolling shutter camera for receiving...
In this paper, we focus on the performance imimprovement of the network coding (NC) based hybrid automatic repeat request chase combining (HARQ-CC) scheme. First, considering the joint detection method with the conventional log- likelihood ratio (LLR) calculation, we design the optimal pair of constellation mappings for bit error rate (BER) minimization. Furthermore, we propose a novel remapping-based...
As evident from the increasing number of technical studies on machine type communications, Internet of Things (IoT) has become a hot topic. Among all the initiatives attempting to build end-to-end connectivity solutions, the 3rd Generation Partnership Project (3GPP) is actively working on the integration of IoT features into the existing 2G and 4G network specifications. In the framework of the adaptation...
In this work, Automatic-Repeat-Request (ARQ) and Maximal Ratio Combination (MRC), have been jointly exploited to enhance the confidentiality of wireless services requested by a legitimate user (Bob) against an eavesdropper (Eve). The obtained security performance is analyzed using Packet Error Rate (PER), where the exact PER gap between Bob and Eve is determined. PER is proposed as a new practical...
This paper presents some experimental results on both the channel estimation based minimum mean square error Turbo equalizer (CE MMSE-TEQ) and the direct-adaptation turbo equalizer (DA-TEQ) in single-input single-output (SISO) underwater acoustic (UWA) channels. For CE MMSE-TEQ, we compare the soft-decision feedback Turbo equalizer (SDFE), the bidirectional soft-decision feedback Turbo equalizer (Bi-SDFE)...
To improve the power-spectral efficiency trade-off of intensity-modulated direct-detection (IM/DD) optical transmissions, enhanced unipolar orthogonal frequency-division multiplexing (eU-OFDM) was recently introduced. Uncoded eU-OFDM systems have been presented in literature but coding techniques to further improve the reliability of transmissions over such systems have not yet been explored. Applying...
In this paper, we study the physical layer abstracting model for MIMO OFDM systems with iterative MMSE receiver. Unlike the abstracting model studied in the literature, we propose to use median variance transfer function to describe the decoder behaviour, where we introduced a new method to compute the symbol variance. The proposed physical layer abstraction model, requires only 2 variance transfer...
In this paper, we study the design of low density signature-orthogonal frequency division multiple access (LDS-OFDM). Compare to the conventional OFDMA system, LDS system has some desirable properties that allows system operating at overloaded conditions. LDS-OFDM system has been shown that outperforms the corresponding OFDMA system. In this paper, we focus on the design of the LDS degrees distribution,...
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