A new FFT-based trellis receiver for multicarrier signals with nonorthogonal frequency spacing (spectrally efficient division multiplexing, SEFDM) is proposed. It based on FFT and max-log-MAP algorithm, which adapted to work samples of received signal. The iterative version demodulator also developed. performance proposed QPSK-SEFDM demodulation comparable the one classic coded QPSK modulation while spectral efficiency remains very high. algorithms can demodulate SEFDM large number subcarriers.

A new type of pulse-shaped multicarrier signals with nonorthogonal frequency spacing (pulse-shaped spectrally efficient division multiplexing, PS-SEFDM) is proposed. Such introduce both out-of-band emission (OOBE) and occupied bandwidth control. The PS-SEFDM generation reception schemes based on IFFT/FFT iterative BCJR algorithm (Bahl, Cocke, Jelinek Raviv) demodulator are BER-performance such comparable level SEFDM OFDM, but OOBE can be greatly reduced by using optimal pulse-shapes.

The BER performance of QPSK spectrally efficient multicarrier signals with non-orthogonal frequency spacing in LTE fading channels is addressed. receiver structure, based on the reduced size DFT proposed. This allows to consider SEFDM signal as an equivalent OFDM and use pilot symbols for channel estimation. main advantage this approach possibility joint equalization demodulation using sphere decoder or another demodulator. typical proposed reception scheme comparable same number subcarriers.

A reduced complexity tone reservation peak-to-average power ratio (PAPR) reduction method for multicarrier signals with nonorthogonal frequency spacing (Spectrally Efficient Frequency Division Multiplexing, SEFDM) is proposed. It based on the modification of Tone Reservation and suits big number subcarriers: 1024-32768. proposed to use a small part band gain obtained by SEFDM reduce PAPR no need send side information receiver. In algorithm additional subcarriers are equally spaced over...

Spectrally efficient frequency division multiplexing (SEFDM) is considered from the Euclidean distance point of view. The simulations are performed for QPSK modulated subcarriers with different bandwidth compression factor values (0.5, 0.75 and 1) in presence absence average power equalization. It shown that SEFDM N-dimensional points have a few very close interfering medium factors. Thus, special rule can be used to choose particular increase BER performance SEFDM. proposed results useful...

This paper presents the FPGA ASIC-like implementation of LDPC decoder for 5G NR BG2 and single lifting factor. The proposed has two main features: architectural algorithmic. first is parallel layered architecture with special offsets inter-layer network which provides great scalability variable factors support. second one an adaptive normalization approach to increase BER performance. requires relatively small number resources Xilinx Kintex Ultrascale 1 information bit/s/cycle throughput 10...

The freezing of the 5th generation new radio (5G NR) Release 16 indicates that 5G development has stepped into a stage. application dedicated low-density parity-check (LDPC) code for channel coding is an important technical advance distinguishes NR from 4th (4G) long-term evolution (LTE) and LTE-advanced. Although LDPC codes been used in many different systems, newly developed integrates cutting-edge technologies to provide better performance attractive features. Thus, it can be good...

The paper addresses the BER performance of nonorthogonal multicarrier (SEFDM, Spectrally Efficient Frequency Division Multiplexing) signals in LTE fading channels. one tap ZF-equalizer and equivalent OFDM presentation SEFDM is used to perform channel correction. Demodulation done using trellis based demodulator. proposed receiver structure has relatively low computation complexity compared demodulators which use sphere decoder. Thus applicable with high number subcarriers as WiFi, LTE,...

A trellis demodulator for spectrally efficient pulse shaped OFDM-signals is proposed. Its' performance analyzed a set of optimal pulses obtained as the solution optimization problem with restriction to certain spectrum reduction rate. We consider shapes general form duration equal OFDM-symbol duration. The iterative version OFDM FEC also BER proposed signals comparable one classic coded modulation same FEC. algorithms does not depend on number subcarriers. They allow introduce...

Many modern telecommunication systems use OFDM signals, because of their high performance in fading channels. Meanwhile, spectrum shortage is one the most urgent problems. SEFDM signals have benefits while less bandwidth at cost degradation or extra computational costs. Computer models help to evaluate processing algorithms and develop them further. However, experimental verification essential order confirm stohastic characteristics real systems. In this paper we describe experiment for...

In this paper the experimental UWB wireless sensor data collection network is presented. The simulation of reception algorithm was performed using Matlab. number transmitters 4. Packets different had formats. It shown that increasing repetitions on physical layer allows achieving BER performance close to theoretical limit. also provides increased probability packet delivery. length preamble 1000 elements and defined by requirements minimization maximization Functional tests conducted for...

This study describes reduced complexity demod-ulator of pulse-shaped spectrally efficient frequency division multiplexing signals (PS-SEFDM). It is based on using successive interference cancellation algorithm (SIC) with Viterbi tree. General expressions for estimation proposed presented. BER performance PS-SEFDM QPSK, QAM-16 the demodulation in AWGN considered. The same as one algorithm, while computational by more than 10 times case QAM-16.

Due to the small number of annotated radar image datasets, use optical images for training neural networks designed detect objects in seems promising. However, have some significant differences from and an experimental investigation this possibility is required. In work we investigate applicability such approach show that case detection ships good results can be achieved. addition, it shown preliminary filtering speckle noise improve results.

Polar codes show potential benefits in modern telecommunication systems, they are already adopted for 5G. The efficiency of polar provided by list successive cancellation decoder which complexity is extremely high large sizes. To overcome this problem keeping the decoding performance on same level sequential was proposed. Although there no hardware implementations and resources estimations decoder. In paper, architecture

The paper addresses a comparison of computational complexity time domain and frequency equalizers for non-orthogonal multicarrier (SEFDM, Spectrally Efficient Frequency Division Multiplexing) signals. is done various values subcarrier spacing parameter number subcarriers.

5G new radio low density parity check (5G-NR LDPC) codes specified by the 3rd generation partnership project (3GPP), a representative class of multi-edge-type, quasi-cyclic and raptor-like LDPC with rate-compatible length-scalable capability, could meet high-throughput demands. The corresponding decoding algorithm implementation should support complexity, high performance scaleinvariance to channel variations receiver imperfections. Flooding scheduling is usually used for prevalent...

A new asymptotically optimal algorithm for OFDM-signal reception under AWGN and OFDM interference shifted in frequency is proposed. It outperforms the known algorithms terms of complexity has no limitations on number subcarriers useful interfering signals. The proposed can be used SEFDM signal when two components it are present: week one "near to base station" user strong "far from user. investigated.

The paper addresses the BER performance of non-orthogonal multicarrier (SEFDM, Spectrally Efficient Frequency Division Multiplexing) signals in LTE fading channels systems with multiple receiver antennas. structures, based on sphere decoder and Maximal Ratio Combining (MRC) were used. SEFDM typical using proposed reception scheme is comparable QPSK OFDM same number subcarriers.