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A combination of single parity check-code and Two-Dimensional (2D) Bahl Cocke Jelinek Raviv (BCJR) detector is used in this paper for joint detection and decoding of 2D interference channel. This is applied to a multi-track two dimensional magnetic recording (TDMR) system. The multi-level 2D BCJR detector handled the code constraint while performing joint detection and single parity decoding. Two...
Interference is identified as a critical issue for satellite communication (SATCOM) systems and services. There is a growing concern in the satellite industry to manage and mitigate interference efficiently. While there are efficient techniques to monitor strong interference in SATCOM, weak interference is not so easily detected because of its low interference to signal and noise ratio (ISNR). To...
The achievable degree of freedom (DoF) boosting has been demonstrated on a single-input single-output (SISO) X channel by using outdated and instantaneous channel state information at transmitter (CSIT) synergistically, in contrast to that of using completely outdated CSIT. However, the means by which the DoF gain can be obtained in a multiple-input multiple-output (MIMO) system remains unclear. This...
A cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) system that transmits information over a time-varying fading channel is considered. In channels with large Doppler spreads, the frequency orthogonality assumption of OFDM is not valid. Hence, inter-carrier interference (ICI) is introduced, which leads to higher bit error rates (BERs). We propose a channel equalizer based on the BCJR...
Opportunity detection at secondary transmitters (TXs) is a key technique enabling cognitive radio (CR) networks. Such detection however cannot guarantee reliable communication at secondary receivers (RXs), especially when their association distance is long. To cope with the issue, this paper proposes a novel MAC called sense-and-predict (SaP), where each secondary TX decides whether to access or not...
A satellite-based Automatic Identification System (S-AIS) receiver has a high probability of message collisions, both in time and in frequency, for a zone densely populated by AIS-enabled ships. Banks of time-and-frequency selective detectors (that use message fields from un-collided messages from the same ship-track together with interference cancellation) decode collided messages. Algorithms are...
Currently, the standardization of fifth generation mobile communication system (5G), which realizes 10 Gbps transmission, is in progress. In mobile communications, it is generally difficult to perform high-capacity transmission because of channel fading. Therefore, an adaptive resource allocation scheme based on users' channel conditions is adopted to enhance the system capacity. Recently, it has...
In this paper, an underlay based cognitive radio network (CRN) consisting of a secondary base station (SBS), a secondary receiver (SR), an energy harvesting node (EHN), and a primary transmitter-receiver (PT-PR) pair, is considered. The EHN is assumed to have a power splitter (PS) at the receiver to decode information and harvest energy simultaneously from the SBS transmission, thus reducing the secrecy...
This paper considers the problem of maximizing energy efficiency on the downlink of two-tier wireless backhaul small cell heterogeneous networks, where an interference mitigation strategy that combines reverse time division duplexing and equally orthogonal spectrum splitting is proposed. By enabling the small cell access points with the capability of switching ON/OFF, we develop a joint design of...
This paper considers interference mitigation techniques in the forward link of multibeam satellite systems. In contrast to previous works, either devoted to receiver interference mitigation (e.g. multiuser detection) or transmitter interference mitigation (precoding), this work evaluates the achievable rates of the joint combination of both techniques. On the one hand, precoding cannot properly mitigate...
Recent advances in rateless codes facilitate the utilization of dense constellation. By exploiting more constellation points with controlled symbol distance, they ensure higher transmission date rate and better diversity gain against fading. In this paper, we observe that there exists certain redundancy in the existing dense constellation diagram. With proper design, such redundancy can be can be...
Given the increasing importance of mobile data access, extending broadband wireless access has become a global grand challenge. Relaying has been introduced to enable wireless communication between users lacking a common link. Distributed relay networks (DRN) are a special case where the relay consists of many geographically distributed single-antenna nodes to achieve spatial diversity. In this paper...
This paper presents a new embedding strategy to extend the performance bound of spread spectrum (SS) based watermarking by introducing more imperceptible distortions measured in the mean square errors (MSE). The potential of the host is sufficiently exploited and utilized to maximize the watermark robustness. This strategy is then realized in audio watermarking by adaptively inverting the host according...
Providing a high level of information reliability is one of the most important problems of digital data transmission systems synthesis for various applications. The paper suggests the theoretical foundations of communication channel model based on a code signal feature (CSF). The encoding and decoding algorithms using CSF models are proposed that allows one to increase the information reliability...
In this paper, we propose a joint decoding and signal processing scheme for NAND flash memory. The proposed scheme provides a considerable improvement of error correcting capability when the raw error rate depends on programming voltage levels, equivalently user data, of the target memory cell and/or adjacent cells. It will be shown that the proposed scheme also requires a fewer number of voltage...
Wideband satellite communication channel can be considered as nonlinear memory channel, which can be described by Volterra model. To counter both nonlinear and memory effects, linear minimum mean square error (LMMSE) based turbo equalizer is proposed in this paper. Although LMMSE is a kind of affine transform, the nonlinear memory interference is cancelled by taking the coefficients of nonlinear memory...
This paper considers a multiuser multichannel simultaneous wireless information and power transfer (SWIPT) cognitive radio (CR) network, where a set of secondary users (SUs) simultaneously harvests energy and decodes information using the same signals transmitted from a cognitive base station (CBS). Power splitting is adopted to realize SWIPT by splitting the signal power into two portions, where...
Zero-Forcing (ZF) algorithm is used to eliminate interference in small scale interference network. With the number of users increasing, the traditional ZF algorithm does not work effectively due to the fact that the channel matrix cannot provide sufficient dimensions to isolate interference. In this paper, we propose a Coordinated Zero-Forcing Beamforming with Clustering(CZFC) scheme to improve the...
Non-orthogonal multiple access (NOMA) is an emerging technology that can improve system spectral efficiency. In this paper, we propose a downlink multiple-input-multiple- output (MIMO) wireless system that incorporates NOMA. To make the system model more realistic, error propagation in successive interference cancellation (SIC) is considered during the decoding process. We formulate an optimization...
This paper proposes a simple hybrid decode- compress- and-forward and compress-and-forward (DCF&CF) relay scheme for the coordinated multipoint (CoMP) uplink transmission. In particular, we consider a scenario that two mobile users (MUs) transmit signal to two access points (APs), which are linked to the central unit (CU) via lossless capacity-limited fronthaul. To characterize the achievable...
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