Abstract A ‐user cyclic shift‐aided serial concatenated code (SCC) is proposed over a Gaussian multiple access channel (MAC). In this code, SCC, which integrates regular repeat‐accumulate with rate‐ and shift spreading (CSS), employed for each user. Here, CSS consists of length‐ bit spreading, same chip‐level interleaver user‐specific shifter. This change avoids repeated complex generation operation the main objective to replace random interleaver. At receiver, iterative decoding considered....

A multi-cyclic redundancy check (Multi-CRC) polar code construction algorithm is proposed in this paper to solve the error propagation problem of successive cancellation decoding for codes. In algorithm, information sequence optimized into several segments allow errors be corrected time, minimizing impact propagation. An improved multi-successive bit flipping (M-SCFlip) execute operation after CRC check-in each segment. low-SNR region, new multi-CRC with list (SCL) has a slight frame-error...

To analyze the relationship among hypertension-relevant knowledge, attitude and behavior to provide evidence for prevention of hypertension. Methods: A total 5 861 employees with hypertension from 10 provinces were selected, their data collected by uniform questionnaires. The structural equation model was established using LISREL version 8.7. Knowledge, set as latent variables, observed variables corresponding served explicit variables. parametric estimation is based on polyserial...

The soft cancellation list (SCANL) decoding algorithm for polar codes runs L (SCAN) decoders with different factor graphs.Although it can achieve better performance than SCAN algorithm, has high latency.In this paper, a fast simplified SCANL (Fast-SSCANL) that independent Fast-SSCAN is proposed.In Fast-SSCANL decoder, special nodes in each graph identified, and corresponding low-latency approaches node propose first.Then, syndrome check aided (SC-Fast-SSCANL) further put forward.The ordinary...

Motivation: CEST quantitation typically relies on model-based fitting and always performs off-scanner. Besides, requires collection a number of saturation frequencies, hindering the clinical applications. Goal(s): To facilitate applications by implementing scanner-inline software through model-free analysis. Approach: We implemented frequency importance analysis Philips pride platform, which could rank acquired frequencies according their contribution to lesion classification, using permuted...

Perfect walking posture has been of enormous significance for fashion model. Models with good postures can convey the design to audience clearly and further attract them. This paper studied analyzed basic famous female models by methods video image analysis. Through analysis measurements from videos images, some principles were acquired. At last, this fabricated a virtual model group standard in gait cycle using 3D software.

In this paper, based on the soft cancellation (SCAN) bit-flipping (SCAN-BF) algorithm, a generalized SCAN (GSCAN-BF-Ω ) decoding algorithm is carried out, where Ω represents number of bits flipped or corrected at same time.GSCAN-BF-Ω corrects prior information code and flips unreliable simultaneously to improve block error rate (BLER) performance.Then, joint threshold scheme for GSCAN-BF-2 proposed reduce average complexity by considering both bit channel quality reliability coded...

Visible light communication (VLC) with non-orthogonal multiple access (NOMA) is one of the most promising technologies in wireless optical communication. To improve system's performance, we first proposed a NOMA-VLC system based on polar codes. Second, to evaluate effect power allocation algorithm transmission quality codes, performance under fixed was studied. Finally, considering time-varying characteristics channels and users' service quality, (QoS)-based dynamic proposed. In algorithm,...

This paper presents a multi-sensor information fusion technology based on electrical system fault diagnosis model, analysis the of several structure layer and realization method, discusses its application in system.Select implement appropriate methods for fusion, different error characteristic parameters can be fused calculated by this more valuable conclusion provided.

该文提出了一种基于置换矩阵(permutation matrix)的非规则低密度奇偶校验(LDPC)码构造方法。首先，提出了基于改进eIRA(IeIRA)算法的全局矩阵M；接着，通过对全局矩阵H进行矩阵置换，生成LDPC码的校验矩阵H；研究了校验矩H中短圈(short cycle)长度与置换矩阵循环移位系数的关系，通过选择循环移位系数，以达到改善误比特率性能的目的。仿真结果表明，该文提出的构造方法在保证线性编码复杂度的前提下，增大了码字的最小距离，减少了小停止集合(stopping set)的数量，降低了误比特率的差错平台(error floor)(达到10-9)。

In order to handle the problem that puncture patterns will change position distribution of original information bits and frozen in polar codes, which affects performance codes further, a minimum row weight spectrum based construction algorithm (called PA-MRWP) is proposed this paper.The calculates generator matrix sorts ascending first.Next, positions with are selected as initial positions.If rows same cannot all be punctured, auxiliary scheme used.In sub-channels weight, corresponding...

In wireless scenarios, an effective protocol to increase the reliability for time-varying channels is hybrid automatic repeat request (H-ARQ). order improve performance of communication system with H-ARQ, a kind full diversity low density parity check (LDPC) on H-ARQ was proposed. The new proposed LDPC codes connect initial transmission repeated transmissions by root-connection get extern gain. addition, evolution process given. Simulation results show that algorithm can not only achieve...

Stereo video is widely used because it can provide depth information. However, difficult to store and transmit stereo due the huge data amount. So, high efficient channel encoding algorithm proper transmission strategy needed deal with over limited bandwidth channel. In this paper, unequal error protection (UEP) based on low density parity check (LDPC) code was wireless bandwidth. Different correction level LDPC according importance of stream reconstruction at receiver. Simulation result...