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给出一个符合CCSDS标准的高速复接/分接设备的软件设计方案.该设备可以将来自不同信源的数据按虚拟信道的概念进行实时复接和分路,实现了TCP/IP协议和CCSDS标准之间的相互转换.介绍了该设备的软件开发技术数据复接、数据分接及帧同步. 相似文献
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STANAG 7023标准是一种军事领域使用的数据复接标准,用于处理文字与图像信息。这一标准通过添加分类标识、时间戳、校验码等冗余信息将信息复接数据包,再将数据包排列为数据段,最后将数据段排列成数据记录,完成复接的功能。在实际使用中,这一标准的缺点是针对辅助信息的复接效率非常低。选取平均长度为28字节的五种常用的信息做复接时,复接效率不足15%。针对这一缺陷,本文利用定长帧与变长帧结合的思想,改进复接方案,将辅助信息复接效率提高到48.3%,提高了信息的复接效率。 相似文献
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在无线数据广播和通信系统中,为了充分利用主链路带宽,提高通信主信道的利用率,通常使用复接技术。如何适应数据源的速率变化是复接技术的关键问题,本文介绍一种自适应复接技术的设计方法及其实现。 相似文献
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利用国际空间数据系统咨询委员会(CCSDS)高级在轨系统(AOS)建议,提出了两级复用的方案,设计了一种具有栽荷数据存储功能的高速实时/回放分级复接器.该方案采用FPGA技术,时星上栽荷输出的数据使用了两级全异步复用的策略进行数据存储和虚拟信道调度.试验结果表明该复接器较好地实现了栽荷数据的存储和复接功能的集成,并且功能灵活,硬件资源利用率小. 相似文献
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戴安刚 《计算机光盘软件与应用》2010,(13)
本文介绍一种利用CPLD及专用集成电路实现的2M通道时隙提取设备,该设备实现将一路RS-232接口的串行数据复接到E1通道的一个选定时隙中,利用E1通道的空闲时隙实现RS232数据的组网及传输. 相似文献
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为解决传统的深度[Q]网络模型下机器人探索复杂未知环境时收敛速度慢的问题,提出了基于竞争网络结构的改进深度双[Q]网络方法(Improved Dueling Deep Double [Q]-Network,IDDDQN)。移动机器人通过改进的DDQN网络结构对其三个动作的值函数进行估计,并更新网络参数,通过训练网络得到相应的[Q]值。移动机器人采用玻尔兹曼分布与[ε]-greedy相结合的探索策略,选择一个最优动作,到达下一个观察。机器人将通过学习收集到的数据采用改进的重采样优选机制存储到缓存记忆单元中,并利用小批量数据训练网络。实验结果显示,与基本DDQN算法比,IDDDQN训练的机器人能够更快地适应未知环境,网络的收敛速度也得到提高,到达目标点的成功率增加了3倍多,在未知的复杂环境中可以更好地获取最优路径。 相似文献
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This paper investigates geometrically (Q,S,R)‐incremental dissipativity and incremental stability for switched time‐varying nonlinear discrete‐time systems. A geometrically (Q,S,R)‐incremental dissipativity concept is proposed for switched nonlinear discrete‐time systems by using multiple storage functions and multiple incremental supply rate. Furthermore, the sufficient conditions of geometrically (Q,S,R)‐incremental dissipativity are given under the design of state‐dependent switching law. The incremental stability conditions are derived for geometrically (Q,S,R)‐incrementally dissipative switched systems. By designing of a composite state‐dependent switching law, the feedback interconnected switched systems are ensured to be geometrically (Q,S,R)‐incrementally dissipative. A numerical example is given to illustrate the validity of the proposed approach. 相似文献
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InforBus/Q是面向分布式应用的消息传递中间件,可在应用程序间传递消息,能够进行海量数据的缓冲和传输,已被广泛应用于各个领域。文章根据某项目中对InforBus/Q并发信息传输响应时间的要求,描述了采用LoadRunner、EtherpeekNx两个工具进行InforBus/Q机制下的并发信息传输响应时间的测试设计、实现及结果分析,有效的解决了以往此项指标无法测试的难题,此方法适用于消息中间件信息传输机制的各种压力测试。 相似文献
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Chung-Ming Huang Chung-Wei Lin 《Multimedia, IEEE Transactions on》2007,9(6):1113-1124
Bit-rate control plays a major role In video coding and multimedia streaming. A well-designed bit-rate control mechanism can achieve line visual qualities and avoid network congestion over a time-varying channel. This paper proposes an H.264 bit-rate control using a 4D perceptual quantization modeling (PQrc), including two major encoding modules: the perceptual frame-level bit-allocation using a 1D temporal pattern and the macroblock-level quantizer decision using a 3D rate pattern. The temporal pattern is used to predict frame complexity and determine proper budget bits further. The rate pattern is depicted as a bit-complexity-quantization (B.C.Q.) model, in which a tangent slope of a B.C.Q. curve is a piece of unique information to find a proper quantizer. For newly generated video clips, the B.C.Q. model is updated continuously using a weighted least-square estimation. In comparison with the latest H.264 JM10.2, our experiment results show that the proposed PQrc can: 1) keep stable buffer fullness and 2) improve the SNR quality and control accuracy effectively. 相似文献
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We describe self-organizing learning algorithms and associated neural networks to extract features that are effective for preserving class separability. As a first step, an adaptive algorithm for the computation of Q(-1/2) (where Q is the correlation or covariance matrix of a random vector sequence) is described. Convergence of this algorithm with probability one is proven by using stochastic approximation theory, and a single-layer linear network architecture for this algorithm is described, which we call the Q(-1/2) network. Using this network, we describe feature extraction architectures for: 1) unimodal and multicluster Gaussian data in the multiclass case; 2) multivariate linear discriminant analysis (LDA) in the multiclass case; and 3) Bhattacharyya distance measure for the two-class case. The LDA and Bhattacharyya distance features are extracted by concatenating the Q (-1/2) network with a principal component analysis network, and the two-layer network is proven to converge with probability one. Every network discussed in the study considers a flow or sequence of inputs for training. Numerical studies on the performance of the networks for multiclass random data are presented. 相似文献
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Direct-conversion transceivers are gaining increasing attention due to their low power consumption. However, they suffer from a serious in- and quadrature-phase (I/Q) imbalance problem. The I/Q imbalance can severely limit the achievable operating signal-to-noise ratio (SNR) at the receiver and, consequently, the supported constellation sizes and data rates. In this paper, we first investigate the effects of I/Q imbalance on orthogonal frequency division multiplexing (OFDM) receivers, and then propose a new I/Q imbalance compensation scheme. In the proposed method, a new statistic, which is robust against channel distortion, is used to estimate the I/Q imbalance parameters, and then the I/Q imbalance is corrected in the frequency domain. Simulations are performed to verify the effectiveness of the proposed method for I/Q imbalance compensation. The results show that the proposed I/Q imbalance compensation method can achieve bit error rate (BER) performance close to that in the ideal case without I/Q imbalance in additive white Gaussian noise (AWGN) or multipath environments. Furthermore, because no pilot information is required, this method can be applied in various standard communication systems. 相似文献
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传统的配网业务路由分配方法的链条占用率过高,导致丢包率较大。为此,设计了基于Q Learning算法的区域配网业务路由分配方法。按照传统分类方式划分业务路由中的性能指标,根据路由约束条件计算指标的约束值,从而确定业务路由的最优传输路径。结合Bellman Equation方法不断计算并更新配网中的Q值,再综合节点和网络业务指标,利用Q Learning算法计算得到区域配网中的风险均衡度。不断变换VNFs的路由顺序将其转换为TSP路由问题,最终得到路由分配矩阵,实现区域配网业务路由的分配。实验结果表明:与传统分配方法相比,基于Q Learning算法的分配方法的链条占用率低,有效减小了业务数据转发过程的丢包率。 相似文献