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This paper describes the comprehensive analysis on the performance of NAND flash/storage-class memory (SCM) hybrid solid-state drive (SSD) during write/erase (W/E) cycling for various applications. Since bit-error rate (BER) increases by cycling, increasingly stronger ECC should be applied, which results in longer ECC calculation time. Both program/erase latencies of the NAND flash memory and ECC...
Motivated by the recent generalized spatial modulation (GSM)-multiple input multiple-output (MIMO) concept, in this paper we conceive a non- coherently detected GSM architecture, which is achieved with the aid of Cayley unitary differential encoding. More specifically, the proposed differentially-encoded transmitter structure enables us to eliminate any limitations imposed by pilot insertions and...
In wireless orthogonal frequency division multipleaccess (OFDMA) standards, subcarriers are grouped into chunks and a chunk of subcarriers is made as the minimum unit for subcarrier allocation. We investigate the chunk-based resource allocation for OFDMA downlink, where data streams contain packets with diverse bit-error-rate (BER) requirements. Supposing that adaptive transmissions are based on a...
Recent studies have shown that buffer-aided relaying with adaptive link selection can provide significant performance gains compared to conventional relaying using a fixed transmission schedule. In this paper, we focus on error rate analysis of adaptive link selection for a three node decode-and-forward (DF) relay network with fixed-rate transmission. As in practice link selection may be performed...
This paper investigates high order NonUniform Constellations (NUC) with constellation sizes of up to 4K-QAM for broadcasting over-the-air very high data rate services such as Ultra-High Definition TV (UHDTV). An iterative algorithm is proposed for fast convergence towards the optimal NUC at each Signal-to-Noise Ratio (SNR) operating point. Performance evaluation assuming DVB-T2 as a reference shows...
A novel near field communication system for s-martphones based on visible light (NECAS) is presented in this paper. NECAS encodes information using combinations of different colors (red, green and blue) and their intensity levels of a smartphone screen, while the receiver captures the light signal via color sensors. In our scheme, a smartphone screen is segmented into four sub-blocks, and each of...
In this paper, we consider an LTE downlink Multiple Input Multiple Output (MIMO) Coordinated Multipoint (CoMP) network. We propose a new adaptive precoding method applied on the signals being transmitted by the set of active antennas. Based on Joint Processing (JP) technique and the precoding method, we define a joint cellular area of cooperation between different evolved NodeBs (eNodeBs) serving...
The OFDM transmission scheme is an efficient technique to overcome frequency-selective nature of wireless broadband channels. Different from existing methods which largely focus on data rate maximizaiton, in this paper we investigate resource allocation schemes to improve bit error rate (BER) performance in a point-to-point OFDM system subject to both throughput and transmit power constraints. Specifically,...
Aggressive Packet Combining (APC) [6] scheme is well established for receiving correct packet in high error prone wireless link. In APC three copies of a packet are transmitted and receiver does bit wise majority decision to get correct copy. Major research lacuna of the APC is if two or more copies of the packet become erroneous at a particular bit location the operation of the majority logic fails...
In this paper we propose a cooperative protocol and a symbol decoding algorithm that target improved performance in the presence of inter-cell interference (ICI) in wireless cellular networks. Our scheme uses the wireless signals that interfere at relay nodes located at the cell edge instead of discarding them. The relays are non-regenerative and apply a space-time code (STC) to the interfered signal...
Transmission Opportunity (TXOP) which is specified in the IEEE 802.11e enables a Wi-Fi station to transmit multiple frames consecutively. In this paper, we propose an adaptive transmission scheme based on the Dynamic Aggregation and Fragmentation (DAF) algorithm. With real-time scheduling and adaptive TXOP allocation being the main focus of the suggested adaptive transmission scheme, optimum transmission...
In this paper, we consider an underlay secondary network comprising of K transmitter-receiver pairs sharing the spectrum of a primary network, which is divided into n non-overlapping frequency bands (subchannels). Each secondary pair can communicate over only one subchannel and should keep the interference generated to the primary network below a threshold. A decentralized multiple access algorithm...
The paper proposes a cross-platform simulator that allows to realistically simulate G3-PLC systems up to the network layer. The platform consists of two simulators: one for the physical (PHY) layer and one for the data link (DLL)/adaptation (ADP) layer. The former is implemented in MATLAB, while the latter in OMNeT++. To improve the performance and coverage of G3-PLC, a simple adaptive tone mapping...
Leung [7] proposed a unique technique for receiving correct packet in high error prone wireless link namely Aggressive Packet Combining (APC). In APC three copies of the packet are transmitted and receiver does bit wise majority logic to get correct copy. Main research challenge in APC is if two or more copies of the packet become erroneous at the particular bit location then majority logic fails...
CRSN (Cognitive Radio Sensor Networks) have recently gained huge interest as an area of research. Naturally, due to energy limitations in WSN (Wireless Sensor Networks), grouping sensor nodes into clusters has been widely adopted by the research community to overcome the issue of limited energy budget and generally achieve high energy efficiency as well as prolonging network lifetime in large-scale...
Cognitive radio (CR) systems require flexible and adaptive implementations of signal processing algorithms. An adaptive symbol detector is needed in the baseband receiver chain to achieve the desired flexibility of a CR system. This paper presents a novel design of an adaptive detector as an application-specific instruction-set processor (ASIP). The ASIP template is based on transport triggered architecture...
We propose Petabit scalable optical switching node with subband accessibility for elastic optical networks. We experimentally demonstrate the subband aggregation and switching on 17.4 Tb/s 16-QAM single-carrier frequency division multiplexing superchannel. Total node throughput of 0.278 Pb/s is achieved.
In this paper, a DFT-based frequency-domain spread spectrum (FDSS) technique for SC transmission is introduced. The transmitted data is initially transformed to frequency-domain signal by using DFT. Frequency-domain spreading can achieve large frequency diversity gain through joint frequency-domain equalization (FDE) and spectrum combining. Performance of the proposed FDSS is evaluated by computer...
Resource allocation for a downlink orthogonal frequency division multiple access (OFDMA) system ensures that capacity and throughput are maximized. In the literature, either channel coding is not considered or only a fixed code rate is specified. To overcome this problem, an optimized cross-layer resource allocation strategy that distributes the user, bit and power optimally has been proposed for...
Measurement results of an analog channel decoder in 65nm CMOS are presented. We target ultra compact and low power applications with low to medium throughput requirements. The decoding core is designed for (7,5)8 convolutional codes and takes 0.104 mm2 on silicon. The degrading effects of analog imperfections are investigated and the presented results allow power, performance and throughput trade-offs...
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