Nuri Kapucu

Hitit University · Department of Electrical and Electronics Engineering

The battery lifetime of wireless devices is crucial for maintaining the communication. Wireless powered communication (WPC) is an important paradigm to meet energy needs for wireless devices. In this study, a WPC system which consists of a user equipment (UE), a power transfer station (PTS) and a receiver node (RN) is considered and it operates acc...

In this work, asymptotic average symbol error rate (ASER) expressions are derived for M-ary phase shift keying (M-PSK) modulations in the presence of additive Laplacian noise over α-κ-µ fading channels. First, an asymptotic probability density function (PDF) is presented for α-κ-µ distribution. Then, asymptotic ASER expressions are proposed based o...

In this paper, the performance of a dual‐branch selection combining (SC) system is analyzed over α−κ−μ fading channels. First, an outage probability (OP) expression is presented for a dual‐branch diversity with the SC scheme in α−κ−μ fading channels by using cumulative distribution function (CDF). By using the probability density function (PDF) and...

In this paper, symbol error probability (SEP) and the average symbol error rate (ASER) of digital modulation schemes are derived in the presence of Fisher-Snedecor F fading. First, an analytical SEP expression is proposed based on complementary cumulative distribution function (CDF) for M-ary phase shift keying (M-PSK) and M-ary pulse amplitude mod...

In this study, analytical expressions are derived by using probability density function approach over millimeter wave fluctuating two-ray (FTR) fading channels for average symbol error rate (ASER) of rectangular quadrature amplitude modulation (RQAM) and cross quadrature amplitude modulation (XQAM) schemes. First, an exact ASER expression for RQAM...

In this work, a closed-form expression is derived for effective capacity of α-κ-μ fading channels. Then, an asymptotic expression is also proposed for the effective capacity of the considered channel model. In addition, an investigation of truncation error analysis is carried out for the infinite series representation which is included in the deriv...

Cooperative nonorthogonal multiple access (NOMA) system is an effective solution for the fifth generation (5G) wireless mobile communications systems. In this work, the achievable rate analysis of a NOMA communication network with decode‐and‐forward (DF) relaying under κ‐μ shadowed fading conditions is investigated. First, we develop an analytical...

In this paper, average symbol error rate (ASER) performance of rectangular quadrature amplitude modulation (RQAM) scheme is analyzed over α-η-µ fading channels. First, an ASER expression is derived based on Chernoff approximation of Gaussian Q-function. Then, an asymptotic ASER formula is obtained for analyzing system behavior at high signal-to-noi...

This Letter presents capacity analysis of Fisher-Snedecor F fading channels under different transmission strategies. To this end, novel analytical expressions are proposed for optimal rate adaptation with constant transmit power, channel inversion with a fixed rate and truncated channel inversion with fixed rate schemes in this Letter. Then, analyt...

This paper analyzes the performance of cooperative decode-and-forward (DF) interleave-division multiple-access (IDMA) networks with best relay selection over Rayleigh/Weibull fading environments. In the analysis, approximate outage probability (OP) and bit error probability (BEP) expressions are derived for the considered system. Further, a 2-hop D...

In this paper, bit error probability (BEP), outage probability (OP) and channel capacity (CC) of direct-sequence code-division multiple access systems with amplify-and-forward relaying are presented for different fading scenarios. In the first scenario, the source-destination link is assumed to experience Rayleigh fading while it is subject to Naka...

Outage probability (OP) of amplify-and-forward direct-sequence code-division multiple-access (DS-CDMA) systems is analysed with best path selection over α-η-μ fading channels. First, cumulative distribution function (CDF) of α-η-μ fading is derived and then, lower bound of the OP is obtained for the considered system. An asymptotic CDF expression i...

In this paper, approximate outage probability (OP) and average symbol error rate (SER) of cooperative direct-sequence code-division multiple access (DS-CDMA) systems with amplify-and-forward (AF) relaying are evaluated over asymmetric fading channels. Practically, the channels between source , relay and destination nodes in a DS-CDMA system can be...

Cooperative communications has recently been introduced into multiple-access networks to combat the signal attenuation caused by fading and therefore improve the network performance. This study proposes the outage probability and error analysis of cooperative interleave-division multiple-access (IDMA) networks with regenerative relays over Weibull...

In this letter, a closed-form approximate bit error probability (BEP) expression is derived for cooperative interleave-division multiple access systems with decode-and-forward relaying subject to multipath Nakagami-m fading channels. The BEP expression is obtained by using the exponential-type approximation of Gaussian Q-function. Then, the derived...

This study analyses the performance of directsequence code division multiple access (DS-CDMA) based on two-hop amplify-and-forward protocol over Weibull symmetric fading channels as well as Rayleigh/Rician, Rician/Rayleigh asymmetric fading phenomenas. We investigate the bit-error rate (BER) of the considered system using multiple relays by conside...

This paper investigates the bit error rate (BER) performance of interleave-division multiple access (IDMA) schemes to show the effect of repetition coding on the system performance. The considered system is tested in the presence of repetition coding by varying system parameters such as number of simultaneous users, data length, spread length, iter...

This paper proposes and investigates dual-hop Nrelay assisted transmission scheme for interleave-division multiple access with decode-and-forward relaying. In the considered system, chip-by-chip detection method is employed to suppress multiuser interference at relay and destination nodes. We assumed binary phase shift keying modulation and analyse...

In this work, bit error rate performance of direct-sequence code-division multiple access systems is investigated by using amplify-and-forward method. First, all channels between source, relays and destination are assumed to be Weibull distributed. Then, the source-destination channel is considered to experience Rayleigh fading while the other chan...

In this study, bit error rate performance of interleave-division multiple access systems using decode and forward cooperative relaying technique are investigated. In the considered system, detection process is achieved based on chip-by-chip detection technique at relay and destination nodes. It is assumed that the channels between cooperating sourc...

This study analyses the performance of two-hop decode-and-forward (DF) relaying protocol under mixed faded channels by evaluating outage probability (P-out) and average bit-error probability (ABEP). It is assumed that the channel between source and relay is Rayleigh fading, whereas the relay-destination link is subject to Weibull fading. First, a c...

In this paper, a closed-form expression for the moment generating function (MGF) of the instantaneous signal to noise ratio (SNR) per symbol is derived for Weibull fading channels. The derived MGF is valid for the rational values of fading parameter and it is shown to be useful for analyzing the symbol error rate for the case of M-ary phase shift k...

In this paper, the performance of amplify-and-forward (AF) cooperative diversity is analyzed over asymmetric fading channels. The source–relay and the relay–destination links experience Rayleigh fading while the source–destination link is subject to generalized Gamma fading. First, the probability density function (PDF) and the moment generating fu...

In this letter, outage probability of dual-hop decode-and-forward (DF) relaying scheme is analyzed over mixed Rayleigh and generalized Gamma fading channels. Cooperation model considered in this work consists of a source, a relay and a destination. It is assumed that source-relay and relay-destination channels experience Rayleigh fading and general...

In an interleave-division multiple access (IDMA) system, interleavers have a crucial role for the system performance. This paper presents a new approach to random interleavers for traditional IDMA systems. The proposed interleaver uses a random variable which is defined by Rayleigh distribution for mapping. Simulation results demonstrate that the p...

A new multiple access technique so-called Interleave-Division Multiple Access (IDMA) is proposed for spread spectrum communications systems in recent years. Assignment of interleaver has an important role for the performance of IDMA technique. For that purpose, various structures of interleaver is proposed for IDMA in the literature. In this study,...