We consider in this paper, a spectrum sharing cognitive radio system with ratio selection scheme; where one out of N independent-and-identically-distributed transmit antennas is selected such that the secondary transmitter (ST) to receiver (SR) channel gain interference from ST primary (PR) maximized. Although previous works considered perfect, outdated, or partial state information at transmitter, we stress using assumptions may lead feedback overhead for updating SR ST-PR estimation....

In this paper, the performance of cloud radio access networks (CRANs) where spatially distributed remote heads (RRHs) aid macro base station (MBS) in transmission is analysed. order to reflect a realistic scenario, MBS and RRHs are assumed be equipped with multiple antennas according Poisson point process. Both, RRHs, employ maximal ratio (MRT) or transmit antenna selection (TAS). Considering downlink transmission, outage three schemes studied; first (ST) scheme, which RRH best channel...

Capacity of the cognitive radio network degrades due to interference constraint from primary network. The secondary capacity can be enhanced in a cost effective way by means spatial diversity, that achieved adding multiple antennas on terminals and performing antenna selection. In this paper, performance multiple-input multiple-output (MIMO) link with transmit selection (TAS) at transmitter maximum ratio combining (MRC) receiver is analyzed. A peak power considered addition two scenarios are...

New coherent receivers are derived for a pilot-symbol-aided distributed space-time block-coded system with imperfect channel state information which do not perform estimation at the destination by using received pilot signals directly decoding. The based on new metrics that use distribution of channels and noise to achieve improved symbol-error-rate (SER) performance. SER performance is further utilizing decision history in receivers. also incorporated existing Euclidean metric improve its...

Recent research in Future Wireless Networks (FWN)s have primarily focused on improving spectral and energy efficiency, emphasizing less reducing power consumption. Studies current Fifth-Generation (5G) system deployment shown that they consume more than their predecessors, thus highlighting the need for significant efforts to minimize carbon footprint. This work specifically focuses consumption considerations, starting from transceiver design extending an entire network can accomplish future...

Electronically steerable parasitic array radiator (ESPAR) antenna has been proposed to obtain multiple functionality with only a single radio frequency (RF) chain.However, for some signals, the input resistance of ESPAR (EA) becomes negative.A negative would lead oscillatory/unstable behaviour an EA transmit signals.In this work, we address issue by obtaining approximate signals transmission, which are close ideal in mean squared error (MSE) sense, and satisfy requirement that is...

Considering two-hop cooperative communication with buffered half-duplex relays, this work jointly optimizes relay selection and transmit power at the to maximize sum-throughput of network subject a minimum throughput requirement each hop constraint. The optimization problem is solved two new buffer aware schemes, namely joint allocation scheme (JPASS) ratio (RSS) are proposed. Numerical results show that average both proposed schemes up 40% higher compared existing in literature.

The performance of adaptive modulation for cognitive radio with opportunistic access is analyzed by considering the effects spectrum sensing, primary user (PU) traffic, and time delay 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> fading channels. Both continuous rate scheme discrete are considered. Numerical examples presented to quantify PU different system parameters.

In this paper, we analyze the delay performance of a point-to-multipoint secondary network (P2M-SN), which is concurrently sharing spectrum with primary (P2M-PN). The channel assumed to be independent but not identically distributed (i.n.i.d.) and has 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> fading. A constraint on peak transmit power secondary-user transmitter...

In this letter, a new power allocation scheme is proposed to improve the reliability of cooperative non-orthogonal multiple access (CO-NOMA). The strong user allocated maximum power, whereas weak minimum power. This alters decoding sequence along with signal-to-interference plus noise ratio (SINR), at users. benefits from receiving copies signal higher allocation. Numerical simulation results show that has lower mutual outage probability (MOP) and offers better as compared conventional for...

Abstract Consider a multi‐user underlay cognitive network where multiple users concurrently share the spectrum with primary users. The channel between secondary is assumed to have independent but not identical Nakagami‐m fading. interference (SUs) and Rayleigh A power allocation based on instantaneous state information derived when peak constraint imposed in addition limited transmit of each SU. uplink scenario considered single SU selected for transmission. This opportunistic selection...

In this letter, we propose a novel Fine-Tuned attribute Weighted Naïve Bayes (FT-WNB) classifier to identify the Line-of-Sight (LoS) and Non-Line-of-Sight (NLoS) for UltraWide Bandwidth (UWB) signals in an Indoor Positioning System (IPS). The FT-WNB assigns each signal feature specific weight fine-tunes its probabilities address mismatch between predicted actual class. performance of is compared with state-of-the-art Machine Learning (ML) classifiers such as minimum Redundancy Maximum...

Capacity of the secondary network degrades due to interference constraint from primary network. The capacity can be enhanced by means spatial diversity, that achieved adding multiple antennas on terminals. In this paper, performance a multiple-input multiple-output (MIMO) link with transmit antenna selection (TAS) at transmitter and maximum ratio combining (MRC) receiver is analysed. A peak power considered in addition constraint. For Rayleigh faded channel, closed-form expression for outage...

Electronically steerable parasitic array radiator (ESPAR) technology enables the implementation of antenna arrays a number elements with single radio frequency (RF) source. Two approaches to achieve stable transmission using an ESPAR (EA) are increase self-resistance EA or transmit signals closely approximating actual that keep stable. Both did not take into account impact limited power on transmission, which is practical constraint amplifier design. We propose new scheme enable provide...

Summary A wirelessly powered temperature sensor is presented in complementary metal‐oxide‐semiconductor (CMOS) 180‐nm process. The wireless power transfer (WPT) performed using resonant magnetic coupling, and a diode‐less AC to DC conversion achieved through quadrature‐oscillator with native‐MOS. quadrature‐signals are subsequently used control the rectifier switches. on‐chip exploits subthreshold region temperature, sensed converted frequency ring‐oscillator, which implemented differential...

In this paper, an analytical framework is presented for device detection in impulse radio (IR) ultra-wide bandwidth (UWB) system and its performance analysis carried out. The Neyman–Pearson (NP) criteria employed device-free detection. Different from the frequency-based approaches, proposed method utilizes time domain concepts. characteristic function (CF) utilized to measure moments of presence absence device. Furthermore, easily extendable existing device-based techniques. This can also be...

Consider a multi-user underlay cognitive network where multiple users concurrently share the spectrum with primary and single secondary user is selected for transmission. The channel assumed to have independent but not identical Nakagami-m fading. Closed form expressions outage performance symbol-error-rate of opportunistic are derived when peak interference power constraint imposed on in addition limited transmit each user.

Performance of multihop cooperative networks depends on the routing protocols employed. In this paper we propose last-n-hop selection protocol, dual path forward-backward protocol and for data through relay networks. The average symbol error probability performance schemes is analysed by simulations. It shown that close to optimal can be achieved using its variant. Furthermore also compute complexity in terms number channel state information required comparisons signal network.

Abstract Consider a system in which the signal is transmitted from source to destination via relay. The source–relay link and relay–destination are assumed have Rician fading. For such system, this paper, we propose novel non‐coherent receiver that detects without knowledge of channel state information (CSI). In addition, also receivers for situation when only partial CSI available at destination; is, either or link, but not both, available. These termed as “half‐coherent receivers” because...