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Widely linear (WL) receivers can fulfill single antenna interference cancellation (SAIC) of one rectilinear (R) or quasi-rectilinear (QR) co-channel interference (CCI). The SAIC technology for QR signals has been shown to be less powerful than SAIC for R signals. To overcome this limitation, a SAIC/MAIC enhancement using three-inputs WL frequency-shift (FRESH) receiver has been introduced for QR signals...
In this paper, we present a multiband ultra wideband (UWB) system design to realize the interference suppression and improve the bit transmission rate. With reasonable division of the UWB bandwidth, the multiband UWB scheme can improve the spectrum utilization and also the bit transmission rate through the utilization of the multiple frequency bands to transmit the information bit simultaneously....
To cater the need of expanding telecom network to rural areas with quality power supply poses a challenge as many areas are still unapproachable to the grid. PV based generation is envisaged to alleviate the problem providing maintenance free and robust in working in low operating cost. The proposed telecom power supply uses a high gain DC-DC MPPT converter having high efficiency and very low current...
We propose a FFT-based universal filtered multicarrier (UFMC) modulation scheme used for datacenter interconnect to support low overhead and agile transmission. The feasibility of this proposed UFMC scheme is experimentally investigated in the IM/DD system. The results have shown that, the UFMC-based datacenter interconnect can achieve great system overhead reduction and support different subband...
This paper derives the energy allocation policy that maximizes the aggregate spectral efficiency of an uncoordinated spread-spectrum multiple access network operating in the large-user regime and subject to a long-term per-user average energy constraint. Focusing on a network of autonomous energy-limited devices, we consider that the receiver operates under noise-dominant conditions and that every...
This paper presents the performance of scheduling for adaptive modulation and coding based on the dynamic margin control. To cover various wireless channel conditions and requirements for multimedia traffic QoS, the selection of suitable MCS (Modulation and Coding Scheme) is important technique in real deployment and management fields. In this paper, we propose dynamic margin control schemes based...
Maximum-likelihood (ML) receivers are optimum receivers for MIMO systems, but their complexity grows exponentially with the modulation order of the codeword and the number of spatial layers. The Reduced Complexity ML (R-ML) receivers based on low complexity adaptation of the max-log MAP detector and reduction of searching space are a good compromise to satisfy complexity-performance trade-off. In...
The usage of IEEE 802.11 wireless equipment has been growing in recent years. Nevertheless, the spectrum which is used by such equipment is already overcrowded and due to this, the performance of wireless devices is decreasing. Recently, IEEE 802.11 was updated with the latest IEEE 802.11ac version. IEEE 802.11ac provides higher modulation capabilities and more robustness against interference. With...
Successive relaying (SR) provides an effective transmission scheme to recover the multiplexing loss of the traditional cooperative networks. However, SR suffers from the inter-relay interference (IRI) problem, which results in transmission error and degrades the system throughput. In order to achieve full-diversity, interference cancellation (IC) is introduced to the reception at relay nodes. To completely...
The paper considers the use of holographic interferometer for hologram re-recording with correction of distortions. This is done with spatially combined interferograms using matrix spatial light modulator and digital image processing of the interferograms recorded by CMOS camera.
Index modulated orthogonal frequency division multiplexing (IM-OFDM) is a newly proposed technique, which achieves significantly improved error performance and peak-to-average power ratio (PAPR) in comparison with classical OFDM due to the activation of partial subcarriers. However, in the presence of inter-carrier interference (ICI), error detection of the subcarrier indices may easily occur, such...
The demand on mobile Internet related services has increased the need for higher bandwidth in cellular networks. The 5G technology is envisioned as a solution to satisfy this demand as it provides high data rates and scalable bandwidth. The multi-tier heterogeneous structure of 5G with dense base station deployment, relays, and device-to-device (D2D) communications intends to serve users with different...
Device-to-Device (D2D) communications underlaying cellular communications can increase resource utilization, system capacity, and interference, while increasing quality of service (QoS) for cellular and D2D users. In this paper, we design a non-cooperative cross-layer repeated game, which jointly optimizes mode selection (i.e. either operating in cellular mode or reuse mode) at the network layer and...
In this paper, a new cooperative spectrum sharing protocol which avoids mutual interference between primary and secondary users by employing spatial modulation (SM) at the secondary transmitter (ST), is proposed for overlay cognitive radio networks. In the proposed protocol, ST cooperates with selective decode-and-forward (DF) relaying strategy to prevent error propagation. Primary transmitter (PT)...
This paper presents a link quality model for a wireless communication system with distributed turbo coding and lossy forwarding. The model maps the signal-to-interference-plus-noise ratio (SINR) of packet copies received from different links to a mutual information parameter and, in a second stage, converts it to a block error rate. We present the design and foundation of the model and validate its...
In this paper, N-continuous (NC) precoding is first combined with spatial modulation (SM) - orthogonal frequency division multiplexing (OFDM) system for sidelobe suppression, and the bit-error rate (BER) performance of the considered system is analyzed over fading channels. On the one hand, the introduced interference of the NC precoder is modeled and analyzed for SM-OFDM, so as to achieve the theoretical...
In this paper, we propose an efficient data exchange mechanism with a dedicated detection approach for Device-to-Device (D2D) communications. By involving in a third device as Relay Node (RN), both devices of interest can communicate with each other. Within an inband relay mode, Interleave Division Multiple Access (IDMA) is exploited to enable the third device to detect and decode the data of both...
In this paper, dual-layer multi-user multiple-input multiple-output systems are studied. Building on the low-complexity layered orthogonal lattice detector (LC-LORD), an efficient sub-optimal joint modulation classification (MC) of the co-scheduled user and data detection receiver is developed. By adjusting the Max-Log-Maximum-a-Posteriori MC approach to the limitations of LC-LORD, and expanding it...
We propose a cross layer design that optimizes the energy efficiency of spectrum sharing systems. The energy per good bit (EPG) is considered as an energy efficiency metric. We optimize the secondary user's transmission power and media access frame length to minimize the EPG metric. We protect the primary user transmission via an outage probability constraint. The non-convex targeted problem is optimized...
Wireless multimedia communications are playing important roles in the emerging communication system, which require effective transmission with resource access for providing diverse Quality of Services (QoS) to accommodate variety of services like multimedia and bursty traffic. MCCDMA-MIMO, Multi Carrier Code Division Multiple Access (MC-CDMA) technique with spatial diversity and spatial multiplexing...
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