ID 原文 译文
45276 针对多用户大规模 MIMO FDD 下行链路系统，分析了导频序列长度随基站天线数变化时对系统下行遍历速率的渐进性能影响。 The effect of pilot sequence length on the asymptotic performance of the ergodic rate was investigated for the multi-user massive multiple-input multiple-output (MIMO) frequency division duplexing (FDD) downlink system.
45277 利用确定性等价原理，推导出遍历速率的解析表达式，基于此分析得出：归一化导频开销（导频序列长度与天线数之比）趋近于 0 时，仍可满足传输速率随基站天线数增加而无限增加；固定导频序列长度而只增加基站天线数，系统传输速率将出现饱和效应。 Firstly,the analytical expression of the ergodic rate was derived by using the principle of deterministic equivalence, based on which, it was discovered from the analytical results in two-fold that the normalized pilot sequence length (defined as the pilot sequence length divided by the number of BS antennas) tends to zero yet the rate was guaranteed to grow large without limit as long as the BS antenna number continues to increase, the rate saturates to a certain level if the BS antena number becomes large with fixed pilot sequence length.
45278 进一步地，在有限的信道相干时间内，以系统和速率最大化为目标来优化导频序列长度，并在特殊相关信道模型下，借助于 Lambert W 函数，推导最优导频序列长度的闭式解。 Moreover, the pilot sequence length was optimized based on the sum-rate maximization within a finite channel coherence time, and a closed-form solution was deduced under a special correlated channel by means of Lambert W function.
45279 仿真结果验证了理论分析的正确性和最优导频序列闭合解的有效性。 Simulation results validate the correctness of the theoretical analysis results and verify the effectiveness of the proposed closed-form solution of the optimal pilot sequence length.
45280 在用户连续查询过程中，针对第三方匿名器结构中 K 匿名难以保证用户隐私的问题，提出一种基于位置混淆的轨迹隐私保护方法。 In the process of continuous queries, a method of trajectory privacy protection based on location obfuscation was proposed to solve the problem that K-anonymity was difficult to guarantee user privacy in third party architecture.
45281 首先通过位置预测机制和假位置选择机制获得(G−1)个查询混淆位置，然后将其与用户真实查询位置一起发送到不同匿名器形成匿名域后，再发送到 LBS 服务器进行查询，最后将获得的查询结果经不同匿名器返回给用户。 Firstly, the (G−1) query obfuscation locations through the location prediction was obtained and the dummy location selection mechanism, and then sent them together with the user’s real query location to different anonymizers to form cloaking regions and sent them to the LBS server for queries, and the query results were returned to the user by different anonymizers.
45282 该方法通过位置混淆来混淆用户的真实查询位置，使攻击者从单匿名器和 LBS 服务器不能推断出用户的真实轨迹，加强了对用户轨迹的隐私保护，也解决了单匿名器的性能瓶颈问题。 In this method, the user’s real query location was confused by the location obfuscation, and the attacker couldn't deduce the user’s trajectory from a single anonymizer or the LBS server.
45283 安全分析表明了该方法的安全性， The method can enhance the privacy of the user’s trajectory and can effectively solve the performance bottleneck in the single anonymizer structure.
45284 实验结果表明，该方法能减少用户与 LBS 服务器的交互次数以及单匿名器的开销。 Security analysis shows the security of the proposed approach, and experiments show this method can reduce the number of inter-actions between the user and the LBS server and the overhead of the single anonymizer.
45285 针对命名数据网络流量全局性优化调度问题，分析已有工作，提出一种基于集中控制的方法。 In order to address the global optimization problem for traffic scheduling in named data networking, related works were analyzed, a method based on centralized control was proposed.