ID 原文 译文
22885 结果表明，该方案满足消息的认证性、匿名性、不可伪造性和可追踪性等性质，并且通信效率高、消息验证的时延短，更适合于动态的车载自组织网络环境。 The results show that the scheme satisfies the message authentication, anonymity, unforgeability and traceability, as well as the higher communication efficiency and the shorter delay of message verification, which is more suitable for dynamic vehicular Ad hoc network environment.
22886 随着无线通信频段的不断提高，非理想载波所引入的相位噪声对 OFDM 系统正交性的破坏也越来越不容忽视。 With the actually used frequency band going higher and higher in wireless communications, the influence of phase noise induced by imperfect carrier on OFDM systems can no longer be ignored.
22887 与此同时，受天线间距离等实际因素的限制，发送或接收端的天线间可能无法共用载波时钟，导致不同天线上的相位噪声互相独立。 At the same time, the restrictions on the antenna spacing may make it impossible for different antennas to share the same carrier clock.
22888 该文在各天线独立的相位噪声的假设下，得出了 MIMO-OFDM 系统各子流检测误差的自相关矩阵的近似表达式，其中公共相位误差(CPE)，载波间干扰(ICI)和热噪声的影响具有可加性，且对于 CPE 和ICI 二者而言，收发相位噪声的影响也近似可加。 In a MIMO-OFDM system with independent phase noises on different antennas, the approximate expression of error covariance matrix for demodulated data streams is given, and it is shown that the influence of CPE, ICI and additive noise are additive and independent of each other; besides, for both CPE and ICI, the influence of phase noises induced by the transmitter or the receiver are additive and independent of each other too.
22889 上述理论推导的合理性通过计算机仿真得以验证。 The validity of the theoretical deduction is verified by numerical simulation.
22890 密文策略属性加密方案，特别是不受某个特定值限制的大规模属性集下的密文策略属性加密方案在云存储中得到了越来越广泛的应用，它能够实现细粒度的访问控制。 Ciphertext-Policy Attribute-Based Encryption (CP-ABE), especially large universe CP-ABE that is not bounded with the attribute set, is getting the more and the more extensive application to the cloud storage.
22891 但是在原始的属性加密方案中，解决动态的用户与属性撤销，是当前面临的重要挑战。 However, there exists an important challenge in original large universe CP-ABE, namely dynamic user and attribute revocation.
22892 为了解决这一问题，该文提出一个标准模型下可证明安全的支持大规模属性集的密文策略属性加密方案，该方案能够实现属性级的用户撤销，即若用户的某个属性被撤销，不会影响该用户其他合法属性的正常访问。 In this paper, a large universe CP-ABE scheme with efficient attribute level user revocation is proposed, namely the revocation to an attribute of some user can not influence the common access of other legitimate attributes.
22893 为了实现撤销，将密钥分为两部分：为用户生成的私钥以及为云存储中心生成的授权密钥。 To achieve the revocation, the master key is divided into two parts: delegation key and secret key, which are sent to the cloud provider and user separately.
22894 在该方案中，若用户的属性被撤销，那么该属性对应的密文将进行更新，只有该属性没有被撤销的用户才能够成功地进行密钥更新而解密密文。 In this scheme proposed, if an attribute is revoked, then the ciphertext corresponding to this attribute should be updated so that only persons who are not revoked will be able to carry out key updating and decrypt the ciphertext successfully.