We propose a method to invert surface wave dispersion data directly for 3-D variations of shear speed, that is, without the intermediate step phase or group velocity maps, using frequency-dependent ray tracing and wavelet-based sparsity-constrained tomographic inversion. A fast marching is used compute, at each period, traveltimes paths between sources receivers. This avoids assumption great-circle propagation in most studies, but which not appropriate complex media. To simplify problem we...

In this study, a high-performance inverter, including the functions of stand-alone and grid-connected power supplies, is developed so that distributed generation units can operate individually or in microgrid mode. power-supply mode, output ac voltage supply to loads. goal management be achieved by controlling amplitude direction current inverter. An adaptive total sliding-mode control (ATSMC) scheme designed for proposed inverter with full-bridge framework. As result, ATSMC has low harmonic...

In this paper, we propose a new downlink non-orthogonal multiuser superposition transmission scheme for future 5G cellular networks, which refer to as the lattice partition multiple access (LPMA). proposed design, base station transmits multilevel codes users. Each user's code level corresponds distinct prime and is weighted by product of all primes other users excluding its own. Due structural property codes, each user can cancel out interference from levels using modulo operation in...

In this paper, we propose a general phase rotated conjugate cancellation (PRCC) scheme for intercarrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) systems. We also derive the optimal rotation such that carrier-to-interference ratio would be maximized. It is shown previous (CC) equivalent to special case of our proposed scheme. The PRCC not only inherits advantages conventional CC scheme, as backward compatibility with existing OFDM systems, low receiver...

In this paper, a novel lattice-partition-based downlink non-orthogonal multiple access framework is proposed. This motivated by recognizing the algebraic structure behind previous scheme recently proposed Shieh and Huang as lattice partition in Z fact generalization of to any base lattice. The schemes enjoy many desirable properties such explicit systematic design discrete input distributions. Moreover, method only requires limited knowledge channel parameters. rates achieved with...

In this paper, the downlink nonorthogonal multiple access (NOMA) system is studied where purely discrete input distributions are found that achieve capacity region to within a constant gap without successive interference cancellation (SIC). The approach two-step corresponding linear deterministic model first and results then systematically translated into for original model. A simple yet powerful coding scheme, which adopts off-the-shelf turbo codes with pulse amplitude modulations (PAM)...

In this paper, we consider the use of lattice codes over Eisenstein integers for implementing a compute and-forward protocol in wireless networks when channel state information is not available at transmitter. We extend compute-and-forward paradigm Nazer and Gastpar to decoding integer combinations transmitted messages relays by proving existence sequence pairs nested lattices which coarse good covering fine can achieve Poltyrev limit. Using result, show that both outage performance...

In this paper, we investigate the problem of downlink non-orthogonal multiple access (NOMA) over block fading channels. For single antenna case, propose a class NOMA schemes where all users' signals are mapped into n-dimensional constellations corresponding to same algebraic lattices from number field, allowing every user attains full diversity gain with single-user decoding, i.e., no successive interference cancellation (SIC). The minimum product distances proposed scheme arbitrary power...

We report a compact, high-power, fiber-based source for ultrahigh-resolution optical coherence tomography (OCT) near 1 μm. The practical is based on short-pulse, ytterbium-doped fiber laser and generation of continuum spectrum in photonic crystal fiber. broadband emission has an average power 140 mW offers axial resolution 2.1 μm air (<1.6 biological tissue). broad bandwidth robust efficient. demonstrate ultrahigh-resolution, time-domain OCT imaging vitro vivo tissues.

Improving seismic hazard mitigation of the densely populated metropol- itan area and around capital Taiwan requires detailed knowledge 3D crustal structure Taipei basin. The high levels ambient noise low regional seismicity this region complicate investigations with traditional exploration or earthquake tomography methods. We investigate shallow crust in metropolitan using surface wave array time domain empirical Green's function (TDEGF) inferred from correlation noise. Analysis TDEGF...

We analyze interleaved concatenation schemes of polar codes with outer binary BCH and convolutional codes. show that both BCH-polar Conv-polar can have a frame error rate decays exponentially the code length for all rates up to capacity, which is substantial improvement in exponent over stand-alone Interleaved long constraint an effective way leverage fact polarization increases cutoff channel. Simulation results when decoded proposed soft-output multistage iterative decoding algorithm...

In this paper, we investigate the fundamental tradeoff between communication and sensing performance of \emph{ad hoc} integrated (ISAC) wireless networks. Specifically, consider that $n$ nodes are randomly located in an extended network with area transmit ISAC signals. Under pure path loss channel gain model condition transmission power scales according to distance, fully characterize optimal scaling law throughput distance by proposing achievable scheme proving its converse. Our results can...

We consider the use of lattice codes over Eisenstein integers for implementing a compute-and-forward protocol in wireless networks when channel state information is not available at transmitter. prove existence sequence infinite-dimensional nested lattices where coarse simultaneously good quantization and additive white Gaussian noise (AWGN) coding fine AWGN coding. Using this, we show that rates achievable with codebooks can be higher than those considered by Nazer Gastpar [1] some set...

In this paper, the problem of downlink non-orthogonal multiple access (NOMA) over slow fading channels is studied. Full-channel state information (CSI) assumed at receivers, while only statistical CSI to be available transmitter. A novel lattice-partition-based scheme proposed which, according CSI, employs discrete inputs from appropriately designed constellations carved a lattice, rather than continuous Gaussian as used in most existing works. Theoretical analysis shows that for any outage...

The impact of labeling a multilevel coding scheme with pulse amplitude modulation constellation in downlink non-orthogonal multiple access (NOMA) systems is studied. Particular interest paid to the case where strong user's receiver does not perform successive interference cancellation (SIC) before decoding its desired message. With judiciously chosen parameters, it was shown recent work that considered can approach capacity region within constant gap. In this letter, analytic and extensive...

The problem of designing downlink transmission schemes for supporting heterogeneous ultra-reliable low-latency communications (URLLC) and/or with other types services is investigated. We consider the broadcast channel, where base station sends superimposed signals to multiple users. Under blocklength constraints, strong users who are URLLC cannot wait receive entire frame and perform successive interference cancellation (SIC) due stringent latency requirements, in contrast conventional...

Recently, the reversible data hiding has become a hot research topic. Its major characteristic is that allows an original image to be completely reconstructed from stego-image after extraction of embedded data.2006, based on histogram was proposed by Ni, et al. (NSAS). However, receiver can not recover secret unless he knows peak point information in stego-image. More recently, Hwang, (HKC) robust scheme shifting method order improve this shortcoming. At same time, they also answer solve...

Operative treatment of prepatellar bursitis is indicated in intractable bursitis. The most common complication surgical for skin problems. For traumatic bursitis, we propose a protocol outpatient endoscopic surgery under local anaesthesia. From September 1996 to February 2001, 60 cases failed nonoperative were included. average age was 33.5 ± 11.1 years (range 21-55). operation duration 18 minutes. Two three mini-arthroscopic portals used our series. No sutures or simple suture needed the...