Superposition Coding for Downlink Underwater Acoustic OFDM

Ma, Lu; Zhou, Shengli; Qiao, Gang; Liu, Songzuo; Zhou, Feng

doi:10.1109/joe.2016.2540741

Cited by 27 publications

(25 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding the wireless channel, the sequence of the instantaneous channel gain or exact channel state information (CSI) at the transmitter side have been supposed in many of the recent works related to NOMA [15]. However, underwater acoustics [16] and high-speed railway (HSR) [17] systems with a quickly varying channel and the large feedback delays lead to the assumption of perfect CSI becoming nearly impractical for many communication scenarios. Recently, NOMA systems with statistical CSI have been considered in recent works [16,18].…”

Section: Introductionmentioning

confidence: 99%

Robust Transmit Antenna Design for Performance Improvement of Cell-Edge Users: Approach of NOMA and Outage/Ergodic Capacity Analysis

Lee

2019

Sensors

View full text Add to dashboard Cite

In this investigation, a wireless sensor network using a non-orthogonal multiple access (NOMA) system is considered in two scenarios related to the number of serving access point/base stations, where two policies provide system performance improvement in two sensors (the near user and the far user). To improve performance efficiency, two robust transmit antenna strategies are designed related to the access point/base station (BS), namely (i) Transmit Antenna Selection (TAS) mode and (ii) two base station (TBS) approach to simultaneously serve NOMA users. First, the TAS scheme is implemented to provide suboptimal outage performance for such NOMA, in which BS equipped at least two antennas while NOMA users are equippeda single antenna. Secondly, the TBS scheme is conducted to enhance the outage performance, especially considering priority evaluation for the far user in user pairs. As an important result, such far users in two proposed schemes are studied by introducing the exact closed-form expression to examine outage behavior. Accordingly, the closed-form expressions regarding ergodic capacity can be further obtained. To corroborate the exactness of these metrics, Monte Carlo simulation is performed. In addition, the proposed schemes exhibit various performance evaluations accompanied by different related parameters such as power allocation factors, the number of transmit antenna, and transmit signal-to-noise ratio (SNR).

show abstract

Section: Introductionmentioning

confidence: 99%

Robust Transmit Antenna Design for Performance Improvement of Cell-Edge Users: Approach of NOMA and Outage/Ergodic Capacity Analysis

Lee

2019

Sensors

View full text Add to dashboard Cite

show abstract

“…Since, the SIC technology can improve spectrum efficiency, it has become the focus of research on the UANs in recent years. So far, many scholars have proposed a variety of underwater acoustic receiver supporting SIC [12]- [16].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, for a minimum frame length, a power optimized schedule algorithm is proposed by joint optimization of senders scheduling and power allocating to minimize aggregated power consumption. Since the K-SIC modem where K is larger than 2 may use a lot of power to transmit data, it has not been widely applied yet [12], [13]. We propose the link scheduling model for SIC-based UANs.…”

Section: Introductionmentioning

confidence: 99%

MLOPS: A SIC-Based Minimum Frame Length With Optimized Power Scheduling for UANs

et al. 2019

IEEE Access

View full text Add to dashboard Cite

Due to the large propagation delay and scarce spectrum resource of the underwater wireless acoustic channels, it is essential to design efficient and reliable multiuser scheduling scheme for underwater network communication systems. The successive interference cancellation (SIC) technology that supports multiple parallel transmissions can improve spectrum efficiency, which is vital for the underwater acoustic networks (UANs). The SIC technology has been widely studied in the underwater network communication systems. However, there is no appropriate technology solving the link scheduling problem in the SIC-based UANs. In this paper, we propose a link-scheduling model for SIC-based UANs and formulate the problem of minimizing the transmission delay and overall network power consumption by combining transmitters scheduling and power allocating. We also present a polynomial-time algorithm named UMLOPS with the complexity of O(n) for unified traffic load, and for weighted traffic load, we present a universal algorithm named WMLOPS with the complexity of O(n 3), where n denotes the number of source nodes. The extensive simulation results reveal that both scheduling frame length and aggregate power consumption of MLOPS significantly outperform those of the existing time-division multiple access protocols in underwater sensor equipped aquatic swarm architecture networks. INDEX TERMS Link scheduling, power allocating, minimum frame length, successive interference cancellation, underwater acoustic networks.

show abstract

“…The underwater acoustic (UWA) communication and networking are widely used to monitor marine environment and explore ocean resources. However, the throughput of UWA networking is very limited by narrow bandwidth of UWA channel, which is only tens of kilohertz [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Thus, research should be done to improve the efficiency and flexibility of the UWA spectrum.…”

Section: Introductionmentioning

confidence: 99%

Digital Self-Interference Cancellation for Asynchronous In-Band Full-Duplex Underwater Acoustic Communication

Qiao

Gan

Liu

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

To improve the throughput of underwater acoustic (UWA) networking, the In-band full-duplex (IBFD) communication is one of the most vital pieces of research. The major drawback of IBFD-UWA communication is Self-Interference (SI). This paper presents a digital SI cancellation algorithm for asynchronous IBFD-UWA communication system. We focus on two issues: one is asynchronous communication dissimilar to IBFD radio communication, the other is nonlinear distortion caused by power amplifier (PA). First, we discuss asynchronous IBFD-UWA signal model with the nonlinear distortion of PA. Then, we design a scheme for asynchronous IBFD-UWA communication utilizing the non-overlapping region between SI and intended signal to estimate the nonlinear SI channel. To cancel the nonlinear distortion caused by PA, we propose an Over-Parameterization based Recursive Least Squares (RLS) algorithm (OPRLS) to estimate the nonlinear SI channel. Furthermore, we present the OPRLS with a sparse constraint to estimate the SI channel, which reduces the requirement of the length of the non-overlapping region. Finally, we verify our concept through simulation and the pool experiment. Results demonstrate that the proposed digital SI cancellation scheme can cancel SI efficiently.

show abstract

Superposition Coding for Downlink Underwater Acoustic OFDM

Cited by 27 publications

References 35 publications

Robust Transmit Antenna Design for Performance Improvement of Cell-Edge Users: Approach of NOMA and Outage/Ergodic Capacity Analysis

Robust Transmit Antenna Design for Performance Improvement of Cell-Edge Users: Approach of NOMA and Outage/Ergodic Capacity Analysis

MLOPS: A SIC-Based Minimum Frame Length With Optimized Power Scheduling for UANs

Digital Self-Interference Cancellation for Asynchronous In-Band Full-Duplex Underwater Acoustic Communication

Contact Info

Product

Resources

About