Today's wireless networks allocate radio resources to users based on the orthogonal multiple access (OMA) principle. However, as number of increases, OMA approaches may not meet stringent emerging requirements including very high spectral efficiency, low latency, and massive device connectivity. Nonorthogonal (NOMA) principle emerges a solution improve efficiency while allowing some degree interference at receivers. In this tutorial style paper, we target providing unified model for NOMA,...

This letter examines the bit error rate (BER) performance of downlink non-orthogonal multiple access networks for binary phase-shift keying modulation. Exact BER expression is derived each user in closed-form under additive white Gaussian noise and Rayleigh fading channels perfect imperfect successive interference cancellation (SIC) cases. Next, SIC case, asymptotic a high signal-to-noise ratio (SNR) region obtained to express behavior network with diversity array gains. On other hand, upper...

In this letter, we investigate the combination of non-orthogonal multiple access (NOMA) with conventional Alamouti space-time lock coding scheme over Nakagami-m fading environments. network, one base station serves users simultaneously by using scheme. The exact outage probability (OP) expression is obtained in closed-form. Moreover, asymptotic analysis also conducted to provide more insights into OP through diversity order and array gain. theoretical results verified Monte Carlo simulations...

The probability distribution function (PDF) and cumulative density of the sum L independent but not necessarily identically distributed gamma variates, applicable to maximal ratio combining receiver outputs or in other words performance analysis diversity receivers operating over Nakagami-m fading channels, is presented closed form terms Meijer G-function Fox H̅-function for integer valued parameters non-integer parameters, respectively. Further analysis, particularly on bit error rate via...

Abstract The probability density function (PDF) and cumulative distribution of the sum L ‐independent but not necessarily identically distributed Gamma variates, applicable to output statistics maximal ratio combining receiver operating over Nakagami‐ m fading channels or in other words statistical analysis scenario where squared distributions is user‐of‐interest, are presented closed form terms well‐known Meijer's G easily computable Fox's H̄ for integer‐valued non‐integer‐valued...

Increasing number of devices connected to the networks, applications and demands new generation wireless communications cause very high energy consumption resulting in large amount carbon emission. Thus, harvesting solutions together with accomplishing information transmission are required for efficient generations such as 5G 6G (i.e., 5G+). As such, due promise green communications, simultaneous power transfer (SWIPT) techniques expected be indispensable component 5G+. In this survey,...

ABSTRACT This work focuses on analyzing the outage probability (OP) in a downlink multi‐user multiple‐input multiple‐output non‐orthogonal multiple access (MIMO‐NOMA) system, specifically employing maximum‐ratio transmission/receive antenna selection structure. In investigated user close to base station (BS) acts as full‐duplex (FD) (or half‐duplex [HD]) energy harvesting (EH) relay adopting decode‐and‐forward (DF) protocol for transmission far user. With and without direct link, we derive...

In this letter, we offer a low-complexity multiple access method based on coordinate interleaving coined as quadrature non-orthogonal (NOMA). It is shown that by properly utilizing two carriers, both error performance enhancement and reduction in the number of successive interference cancellation (SIC) operations can be attained compared to standard power-domain NOMA approach. Specifically, K-user network with single-antenna nodes, SIC more than 50% original scheme. When K=2, power gain...

Orthogonal time frequency space (OTFS) modulation is strongly considered as a promising solution for high-mobility communications. In contrast to conventional techniques, wherein information symbols are multiplexed in one-dimensional or domain, OTFS employs two-dimensional scheme by multiplexing the delay-Doppler domain. This paper presents comprehensive survey of OTFS. It starts with an overview OTFS, its advantages over air interface general block diagrams, and implementations....

This paper focuses on multi-antenna systems that employ both maximal-ratio transmission and receive antenna selection (MRT&RAS) in independent identically distributed Nakagami- <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$m$ </tex></formula> flat-fading channels with channel estimation errors (CEE) [or feedback quantization (FQE)] delay (FD). Useful statistics of the postprocessing signal-to-noise...

In this paper, multi-antenna systems employing both single transmit and receive antenna selection (single TAS/single RAS) are examined for independent identically distributed (i.i.d.) flat Nakagami-m fading channels. joint scheme, signal transmission reception is performed over a communication link with the highest signal-to-noise ratio (SNR). Exact bit/symbol error rate expressions binary modulation, M-ary phase shift keying square quadrature amplitude modulation signals derived by using...

This paper presents a unified outage probability (OP) performance analysis of two hybrid antenna selection (AS) schemes, transmit (TAS) and maximal ratio combining (MRC), joint receive (JTRAS) in multiple-input multiple-output non-orthogonal multiple access based downlink amplify-and-forward (AF) relaying network with channel estimation error (CEE) feedback delay (FD). Since the communications first second hops are kinds single-user multi-user communications, respectively AS is done as...

In this paper, we propose an analytical framework on the exact computation of average symbol error probabilities (ASEP) multihop transmission over generalized fading channels when arbitrary number amplify-and-forward relays is used. Our approach relies moment generating function (MGF) to obtain single integral expressions which can be easily computed by Gauss-Chebyshev Quadrature (GCQ) rule. As such, derived results are a convenient tool analyze ASEP performance relay channels. Numerical and...

In this paper, performances of joint transmit and receive antenna selection (JTRAS), selection/maximal ratio combining (TAS/MRC), selection/receive (TAS/RAS) techniques are examined in a unified manner the (42) presence feedback errors. Exact closed-form outage probability, moments, moment-generating function, ergodic capacity, symbol error probability (SEP) expressions derived for flat Nakagami-m fading channels. addition, to obtain diversity order array gain investigated errors, asymptotic...

A novel transceiver antenna selection (TRAS) strategy selecting a pair of antennas for transmission and reception at terminal sources full-duplex amplify-forward multi-input multi-output two way relay networks is proposed. Antenna selected in accordance with maximum second signal to self-interference-plus-noise ratio between the relay, where are full-duplex. Unlike reciprocal channel gains, forward backward paths taken be different. With four different (AS) scenarios, exact sum outage...

This paper develops new suboptimal antenna selection (AS) schemes, majority based transmit selection/maximal ratio combining (TAS-maj/MRC) and joint receive (JTRAS-maj), in a multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) network. The impact of the channel estimation errors (CEEs) feedback delay (FD) on performance network is studied Nakagami-m fading channels. First, outage behavior investigated unified manner for proposed AS schemes by deriving closed-form...

Closed-form moment generation function (MGF) expressions for the harmonic mean of N independent and not identically distributed generalized gamma random variables (RVs) are presented some well known special cases accentuated. The statistical results also applied in order to obtain exact symbol error rate (SER) performance wireless multihop transmission with non-regenerative relays M-ary coherent modulations over flat fading channels.