The Internet of Things (IoT) promises ubiquitous connectivity everything everywhere, which represents the biggest technology trend in years to come.It is expected that by 2020 over 25 billion devices will be connected cellular networks; far beyond number current wireless networks.Machine-to-Machine (M2M) communications aims at providing communication infrastructure for enabling IoT facilitating billions multi-role communicate with each other and underlying data transport without, or little,...

The next wave of wireless technologies is proliferating in connecting things among themselves as well to humans. In the era Internet Things (IoT), billions sensors, machines, vehicles, drones, and robots will be connected, making world around us smarter. IoT encompass devices that must wirelessly communicate a diverse set data gathered from environment for myriad new applications. ultimate goal extract insights this develop solutions improve quality life generate revenue. Providing...

Massive machine-type communications (mMTC) is one of the main three focus areas in 5th generation (5G) wireless technologies to enable connectivity a massive number Internet things (IoT) devices with little or no human intervention. In conventional human-type (HTC), due limited available channel resources and orthogonal resource allocation techniques, users get transmission slot by making scheduling/connection requests. The involved control signaling, negligible respect huge transmit data,...

This article reviews state of the art channel coding techniques for URLLC. The stringent requirements URLLC services, such as ultrahigh reliability and low latency, have made it most challenging feature 5G mobile networks. problem is even more services beyond promise, tele-surgery factory automation, which require latencies less than 1ms packet error rates 10-9. provides an overview compares them in terms performance complexity. Several important research directions are identified discussed detail.

Fifth-generation cellular mobile networks are expected to support mission critical URLLC services in addition enhanced broadband applications. This article first introduces three emerging applications of and identifies their requirements on end-to-end latency reliability. We then investigate the various sources delay current wireless by taking 4G LTE as an example. Then we propose evaluate several techniques reduce from perspectives error control coding, signal processing, radio resource...

The Internet of Things (IoT) is a revolutionizing technology which aims to create an ecosystem connected objects and embedded devices provide ubiquitous connectivity between trillions not only smart but also simple sensors actuators. Although recent advancements in miniaturization with higher computational capabilities ultra-low power communication technologies have enabled the vast deployment actuators everywhere, such evolution calls for fundamental changes hardware design, software,...

In this paper, we consider a massive grant-free non-orthogonal multiple access (GF-NOMA) scheme, where devices have strict latency requirements and no retransmission opportunities are available. Each device chooses pilot sequence from predetermined set as its signature transmits selected data simultaneously. A collision occurs when two or more choose the same sequence. Existing GF-NOMA schemes assume that of at least one pair users entails for all simultaneously transmitting users, which is...

Machine-to-machine (M2M) constitutes the communication paradigm at basis of Internet Things (IoT) vision. M2M solutions allow billions multi-role devices to communicate with each other or underlying data transport infrastructure without, minimal, human intervention. Current for wireless transmissions originally designed human-based applications thus require a substantial shift cope capacity issues in managing huge amount devices. In this paper, we consider multiple access techniques as...

In this paper, we propose a codebook-based beam tracking strategy for mobile millimeter-wave (mmWave) systems, where the temporal variation of angle departure (AoD) is considered. A closed-form upper bound average error probability (ATEP) derived and further optimized. We first consider slow-varying scenario narrow training beams implemented by single radio-frequency (RF) chain are employed. show that ATEP can be reduced optimizing power allocation over these beams, which formulated...

This article reviews the potential channel decoding techniques for ultra-reliable low-latency communications (URLLC). URLLC is renowned its stringent requirements including ultra-reliability, low end-to-end transmission latency, and packet-size flexibility. These exacerbate difficulty of physical-layer design, particularly coding schemes. To satisfy URLLC, decoders must exhibit superior error-rate performance complexity. Also, it desired that be universal to accommo-date various provides a...

Real-time remote estimation is critical for mission-critical applications including industrial automation, smart grid and tactile Internet. In this paper, we propose a hybrid automatic repeat request (HARQ)-based real-time framework linear time-invariant (LTI) dynamic systems. Considering the quality of such system, there fundamental tradeoff between reliability freshness sensor's measurement transmission. We formulate new problem to optimize online transmission control policy static Markov...

Future machine to (M2M) communications need support a massive number of devices communicating with each other little or no human intervention. Random access techniques were originally proposed enable M2M multiple access, but suffer from severe congestion and delay in an system large devices. In this paper, we propose novel scheme for based on the capacity-approaching analog fountain code efficiently minimize satisfy requirement device. This is achieved by allowing transmit at same time...

In this paper, we propose a capacity-approaching analog fountain code (AFC) for wireless channels. AFC, the number of generated coded symbols is potentially limitless. contrast to conventional binary rateless codes, each symbol in AFC real-valued symbol, as weighted sum $d$ randomly selected information bits, where and weight coefficients are from predefined probability mass functions. The then directly transmitted through We analyze error design set minimize probability. Simulation results...

Machine-to-machine (M2M) wireless systems aim to provide ubiquitous connectivity between machine type communication (MTC) devices without any human intervention. Given the exponential growth of MTC traffic, it is utmost importance ensure that future standards are capable handling this traffic. In paper, we focus on design a very efficient massive access strategy for highly dense cellular networks with M2M communications. Several allowed simultaneously transmit at same resource block by...

We propose a novel random access (RA) scheme with the quality of service (QoS) guarantees for machine-to-machine (M2M) communications. consider slotted uncoordinated data transmission period during which machine type communication (MTC) devices transmit over same radio channel. Based on latency requirements, MTC are divided into groups different sizes, and frame is sub-frames lengths. In each sub-frame, group assigned an probability based device decides to replicas its packet or remain...

In this article, we consider the massive nonorthogonal multiple access (NOMA) with a hybrid automatic repeat request (HARQ) for short packet communications. To reduce latency, each user can perform one retransmission provided that previous was not decoded successfully. The system performance is evaluated both coordinated and uncoordinated transmissions. We first develop Markov model (MM) to analyze dynamics characterize error rate (PER) throughput of in scenario. power levels are then...

The fifth generation (5G) of mobile standards is expected to provide ultrareliability and low-latency communications (URLLC) for various applications services, such as online gaming, wireless industrial control, augmented reality, self driving cars. Meeting the contradictory requirements URLLC, i.e., low latency, considered be very challenging, especially in bandwidth-limited scenarios. Most communication strategies rely on hybrid automatic repeat request (HARQ) improve reliability at...

Single-carrier frequency-division multiple access (SC-FDMA) based index modulation (IM), referred here as SC-IM, allows users to implicitly transmit a part of their data bits by switching on some allocated subcarriers, followed M-ary constellation symbols transmission over the activated subcarriers. This sparse use subcarriers provides better energy efficiency and error rate. Using these benefits, this letter exploits SC-IM with uplink power domain non-orthogonal (NOMA), where all same...

In this paper, we revisit the design of Raptor codes for binary input additive white Gaussian noise (BIAWGN) channels, where are interested in very low signal to ratios (SNRs). A linear programming degree distribution optimization problem is defined SNR regime through several approximations. We also provide an exact expression polynomial representation with infinite maximum regime, which enables us calculate value fractions output nodes small degrees. more practical proposed include rate...

Adaptive coding and modulation in current cellular networks relies on a channel quality indicator fed back from the receiver to transmitter. The process of acquiring state information at transmitter (CSIT) is estimated take 5–8 ms. For short-packet transmissions machine-type communications (MTC), data transmission small payloads fraction millisecond, i.e., end latency. This especially problematic for ultra-reliable low-latency (URLLC) that require an end-to-end latency 1 ms only. To this...

This letter proposes an efficient probability-based ordered-statistics decoding (PB-OSD) algorithm for short block-length codes. In PB-OSD, we derive two probabilistic measures on the codeword estimates and test error patterns, respectively referred to as success probability promising probability. Based these probabilities, a stopping criterion discarding are developed reduce number of patterns limit complexity. To further complexity, propose tree-based search strategy find most likely in...

This paper considers density evolution for low-density parity-check (LDPC) and multi-edge type LDPC (MET-LDPC) codes over the binary input additive white Gaussian noise channel. We first analyze three single-parameter approximations discuss their accuracy under several conditions, namely, at low rates, with punctured degree-one variable nodes. observe that assumption of symmetric distribution density-evolution messages is not accurate in early decoding iterations, particularly rates Thus,...

In this paper, we propose an efficient reliability based segmentation-discarding decoding (SDD) algorithm for short block-length codes. A novel segmentation- discarding technique is proposed along with the stopping rule to significantly reduce complexity without a significant performance degradation compared ordered statistics (OSD). decoder, list of test error patterns (TEPs) divided into several segments according carefully selected boundaries and every segment checked separately during...

In this paper, we present a priori-aided beam alignment scheme for time-varying millimeter wave multiple-input multiple-output (MIMO) systems, where the temporal correlations of angle departure (AoD) and arrival (AoA) propagation path are exploited. Specifically, variations AoD AoA between two consecutive channel realizations described by set transition probabilities, respectively, which characterize correlations. We aim to maximize average successful estimation probability (ASEP) jointly...