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This paper studies the physical-layer benefits of low latency operation in long-term evolution (LTE) networks. Latency reduction can be achieved by reducing the transmission time interval (TTI) from 1ms to the duration of only a few orthogonal frequency-division multiplexing symbols. The TTI shortening potentially enables faster link adaptation, thereby enhancing system performance. However, enabling...
The inclusion of a previously non-existent traffic class required by the Smart Grid poses many difficulties on OFDMA based wireless communication systems. In this paper, we develop a resource allocation algorithm based on the ecological research Lotka-Volterra equations. Each class of traffic is modelled as a species and they compete over the telecommunications resources. Constraints were then placed...
In this paper, a flexible scheme with exclusive-OR (XOR) coding is suggested for improving error performance in two-way relay networks. The sources, exchanging their packets through relay(s), encode multiple packets into one packet and the encoded packet helps correct decoding of actual packets exchanged between sources. We also employ orthogonal frequency division multiplexing in the considered two-way...
Wireless communication technologies became the key integral part of modern systems, experiencing an explosive development during the last two decades and penetrating to enormous number of application areas, based especially on the concept of cellular phones. More recently, short-distance wireless communication has also been discussed as a way to connect embedded electronic systems in industrial applications,...
An efficient architecture of a 64-point FFT processor using two-dimensional algebraic integer (AI) encoding is presented. The advantage of two-dimensional AI encoding is that the hardware complexity for multiplication is reduced since a multiplication can be replaced by a few simple shifts and additions. The ROMless FFT processor, which replaces the ROM for twiddle factors with a twiddle factor generator...
In this paper, the main features of the construction of modem equipment of the new generation of troposcatter stations is presented. Such stations will be able to provide high data transfer rates with guaranteed transmission quality in complex stationary and non-stationary noise inherent in tropospheric channels. The goal is achieved by using new (or progressive) technical and architectural concepts,...
A multimode 850-nm VCSEL with its relative-intensive-noise suppressed to −145 dBc/Hz is employed for directly encoded 56-Gbps 16-QAM OFDM and 22-Gbps PAM-4 transmissions with corresponding BERs of 3.2×10−3 and 1.9×10−10, respectively.
The severe time-varying multipath effect of underwater acoustic (UWA) channels has posed a great challenge for shallow water communication system design. Although existing literature has demonstrated that multicarrier modulation in the form of orthogonal frequency division multiplexing(OFDM) is an effective technique to deal with severe multipath effect of UWA channels, the experiments of medium distance...
The MIMO-OFDM technology is under the significant considerations for the development of various wireless communication systems. A WLAN for 5G is for very high throughput. The combination of Multiple Input Multiple Output with multicarrier, Orthogonal Frequency Division Multiplexing (MIMO-OFDM) delivers a significant performance improvement in terms of many parameters like transmission rate, smaller...
Vehicular Ad-Hoc Network (VANET) is the fundamental part of future Intelligent Transportation System (ITS). Physical layer is applied to provide messages transmission between vehicle nodes in VANET, so it has great influence on efficiency of ITS. On the basis of analyzing IEEE 802.11p protocol, we presented a design scheme for physical layer communication system of On Board Unit (OBU) in VANET. Furthermore,...
This paper evaluates the bit-error rate and spectral efficiency performance provided by the convolutional coded Quadrature Amplitude Modulation (QAM) configurations whose global rates are modified mainly by changing the numbers of code and non-coded bits mapped on a QAM symbol. The Bit Error Rate (BER) performance provided are compared to the ones of the convolutional coded modulations which map only...
In wireless communication systems data recovery represents an important challenge at receiver's end. The performances of MC-CDMA systems can be improved by using OFDM technique. This paper illustrates the improvement brought in MC-CDMA OFDM systems when choosing the LDPC coding/decoding technique and the appropriate spreading sequences to separate the users. There have been tested the performances...
Japan Broadcasting Corporation (NHK) is aiming to broadcast ultra high definition television (UHDTV), such as 8K, terrestrially. To evaluate a next-generation terrestrial network, two experimental stations composed of an advanced single frequency network (SFN) using space-time coding technology were set up in the Hitoyoshi area of Kumamoto, Japan. The transmission capacity of each experimental station...
This paper is concerned with the coded orthogonal frequency division multiplexing (OFDM) with index modulation (IM) for highly mobile wireless communication based on block Markov superposition transmission (BMST). In the OFDM-IM scheme, the information bits are not only mapped into the conventional two-dimensional signal points but also into the indices of the subcarriers. For the coded IM system,...
Orthogonal Frequency Division Multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. It has become a prevalent technique for wideband digital communication. Forward Error Correction (FEC) schemes for OFDM communication system is presented in this paper. Interleaver is a vital part in the communication system design. Matrix interleaver implementation which significantly...
Optical wireless communication is the potential alternative resource for the congested RF wireless spectrum. Multicarrier communication technique Orthogonal Frequency Division Multiplexing (OFDM) is used in optical wireless transmission systems. To guarantee unipolarity of optical wireless transmission, Flip-OFDM is one of the promising unipolar OFDM technique developed. The key constraint in optical...
Cooperative relay systems have drawn much attention in recent years because they can use an appropriate number of relays to form a virtual multiple-input multiple-output (MIMO) scenario to improve communication links. Also, space frequency block coding (SFBC) is a prominent strategy for MIMO systems, and it has been widely adopted with orthogonal frequency division multiplexing (OFDM) to achieve both...
Filter Bank MultiCarrier (FBMC) might replace Orthogonal Frequency Division Multiplexing (OFDM) in 5G. For such FBMC system, we derive closed-form expressions for the Bit Error Probability (BEP) including channel estimation, whereas we focus on the comparison of FBMC with OFDM. We assume additive white Gaussian noise and a Rayleigh fading channel with low delay spread and low Doppler spread, so that...
This paper provides a comprehensive survey focused on applicability of MIMO and Multicarrier systems to satellite communication. The significant research achievements in the area of Multiple antenna and multicarrier technology can be successfully used in satellite communication similar to terrestrial communication. A detailed review of MIMO and OFDM based techniques for satellite communication is...
FSO systems are speedily attaining attractiveness for delivering various communication services and have become one of the preferred high-speed media. The primary challenge for FSO systems is atmospheric conditions that result in degradation of signal strength. In this paper, the impact of advance line-coding over FSO link subjected to different turbulent conditions has been investigated. The proposed...
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