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Large peak-to-average power ratio (PAPR) is the major issue in orthogonal frequency-division multiplexing (OFDM) systems. Selective mapping (SLM) has been commonly employed to reduce the PAPR. However, SLM requires side information (SI) which reduce the bandwidth efficiency. A low-complexity cyclic SLM (C-SLM) scheme without SI which uses delay correlation and matched filter, called C-SLM-DC-MF, has...
In recent years, a new communication technology emerged by taking advantage of the high-speed switching capabilities of LED known as VLC (Visible Light Communication) has been getting more attention. On the other hand, OFDM is one of the technology that can efficiently utilize a frequency band. In this paper, our goal is to develop a VLC OFDM system, that is easily operable, and capable of high speed...
Complete complementary code (CCC) is a family of spread spectrum sequences having ideal correlation properties. Digital watermarking techniques based on CCC have been proposed by the authors. It has been shown that the proposed digital watermarking has high payload capacity even in the blind detection case. An improvement of CCC-based digital watermarking scheme called HSA (host signal approximation)...
The spread spectrum communication (SSC) technology is widely used in different kinds of communication field due to it's advantage in anti-jamming. In this paper, we show the simulation system of generating spread code including m sequence, orthogonal gold sequence, M sequence by using MATLAB/Simulink model. Furthermore, by utilizing the fantastic cross-correlation property of orthogonal gold sequence,...
Wireless relaying has been proved as an efficient transmission technique which improves wireless system reliability and durability, through increased network range, capacity and energy efficiency. However, performance of wireless relay systems is strongly influenced by the worst communication link between the transmitter and the receiver. In realistic communication scenario characterized with non-identical...
Double Weight (DW) code families are constructed with different algorithms and fixed value of users at basic code matrix. A single code construction algorithm is proposed for DW code families in which, number of users for basic code matrix depends on the code weight and on a constant value. Mapping is used to provide the greater number of users. Affect of basic matrix (used in mapping) on Bit Error...
A new method of applying EMD (empirical mode decomposition) algorithm to realize the CFO (carrier frequency offset) estimation of single channel OFDM (orthogonal frequency division multiplexing) system is proposed in this paper. Firstly, the observation signal is extracted by using correlation detection technology to process the received OFDM signal. Then the data with CFO information is obtained...
In this paper, a high efficient differential chaos shift keying (DCSK) based on frequency division multiplexing (FDM) communication system, namely FDM-HEDCSK is proposed. The scheme has two branches and a serial-parallel converter to achieve four attainable bit rates and improve communication security in comparison to DCSK. In this scheme, the combination of two chaos signals is used as the reference...
In order to overcome the major implementation problem of long delay line requirement in the conventional transmitted reference (TR) signaling, transmitted reference pulse cluster (TRPC) structure was proposed and further developed for noncoherent ultra-wideband (UWB) systems. In this paper, weighted autocorrelation receiver (WAcR) is introduced for the TRPC system with hybrid binary phase shift keying...
With the continuously increasing demand for higher bandwidth, bit rates of high speed serial links (USB, SATA, PCI-express, etc.) have reached the multi-gigabits per second. The transmitted jitter at a given bit error rate is one of the major electrical parameters used to characterize SerDes Integrated Circuit performance. The standard organizations specify RJ and DJ budgets. Decomposing the jitter...
This paper studies a transmission scheme for in-band full-duplex communication system, which is established on the base of complementary codes. Having ideal correlation properties, complementary codes are capable of providing effective mitigation of self-interference (SI) introduced by co-frequency co-time full-duplex (CCFD) communications, an efficient multiple access for multiple users as well as...
In this paper, we investigate the channel correlation problem which affects the performance of indoor multiple-input multiple-output (MIMO) visible light communication (VLC) systems. More specifically, in order to reduce the high correlation of channel matrix in MIMO-VLC intensity channel, we propose a non-imaging receiver called angle-aided mirror diversity receiver (AMDR) which utilizes not only...
In this paper, the decision-level data fusion techniques are extended to the multiuser detection (MUD) field. Then a novel MUD algorithm that is the combine application decision-level fusion criterion (CA-DFC) based MUD algorithm is proposed for DS-UWB communication systems. In CA-DFC based method, the combine detectors can make decisions among the preliminary decisions from sub-optimal detectors...
Transform domain communication system (TDCS) has been proposed to support multiuser communications through spectrum bin nulling and frequency domain spreading for overlay cognitive radio networks. In TDCS systems, specific pseudorandom spreading sequences are assigned to different users for the purpose of multiple access. However, due to the non-zero cross-correlations between any pair of TDCS signals,...
We propose the orthogonal complementary code (OCC) based code-selected high efficient ultra wideband (UWB) modulation scheme over multipath channel in the paper, where the OCC with perfect correlation properties is employed to spread spectrum and also to carry the information bits and the theoretical analysis is obtained based on the moment generating function (MGF). In this scheme, the information...
Conventional underwater acoustic (UWA) spread spectrum communication technology usually uses m sequence as a spreading code, but pulse position modulation (PPM) spread spectrum system utilizes the aperiodic autocorrelation function (AACF) characteristic of a sequence. M sequence is not the best choice in case of AACF. To solve this problem, and based on the fine AACF property of N-H sequence, PPM...
In a recent paper, we have proposed a filter bank multicarrier spread spectrum (FB-MC-SS) waveform as a new method for wideband spread spectrum communications in HF bands. We have noted that FB-MC-SS is well suited for this application because of its robustness against narrow and partial band interference and because it has good performance over a wide range of delay and Doppler spreads. In this paper,...
Medical Image Watermarking has been proposed as a solution to deal with the problems of integrity, authenticity, and confidentiality and communications secrecy of medical images over networked environments. Medical image watermarking schemes exploit crucial traits of the medical image but this is not so for conventional images. In this paper, we compare the performance of block based SVD watermarking...
High-speed I/O link plays an important role in modern computer systems. In order to accurately estimate a small BER value in the order of 10−12, a large number of bits need to be transmitted, which results in expensive testing cost. In this paper, we exploit the correlation between the performance of high-speed I/O link under different corners/configurations to improve the accuracy of the estimated...
Discrete Fourier transform spread orthogonal frequency division multiplexing (DFTs-OFDM) has recently attacked much interest in research and developments on wireless communication systems. The combination of direct sequence code division multiple access (DS-CDMA) and DFTs-OFDM potentially offers the degradation of bit error rate (BER) performance as indicated in literatures. This paper presents the...
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