排序方式: 共有4条查询结果,搜索用时 78 毫秒
1
1.
针对无人机数据链信息传输的有效性和可靠性需求,提出一种无人机数据链的自适应编码调制方法,通过对自适应编码调制方法的模块化设计,以及仿真计算机与微波仪表的协同工作,在微波暗室环境内,实现了自适应编码调制方法的半实物仿真;仿真结果表明:在信噪比为1.4~14dB区间内,误码率为10-5时,基于Turbo码和LDPC码的自适应编码调制方法的吞吐量高于其它非自适应编码调制方法的吞吐量,提高了无人机数据链信息传输的有效性和可靠性. 相似文献
2.
3.
Performance of the Adaptive Coding and Modulation(ACM) strongly depends on the retrieved Channel State Information(CSI),which can be obtained using the channel estimation techniques relying on pilot symbol transmission.Earlier analysis of methods of pilot-aided channel estimation for ACM systems were relatively little.In this paper,we investigate the performance of CSI prediction using the Minimum Mean Square Error(MMSE)channel estimator for an ACM system.To solve the two problems of MMSE:high computational operations and oversimplified assumption,we then propose the Low-Complexity schemes(LC-MMSE and Recursion LC-MMSE(R-LC-MMSE)).Computational complexity and Mean Square Error(MSE) are presented to evaluate the efficiency of the proposed algorithm.Both analysis and numerical results show that LC-MMSE performs close to the wellknown MMSE estimator with much lower complexity and R-LC-MMSE improves the application of MMSE estimation to specific circumstances. 相似文献
4.
针对宽带卫星通信中信道降雨衰落的非线性特性,研究了多进制幅度移相键控MAPSK调制方法,该方法通过对调制信号星座采取非对称的优化设计方法,有效抵抗了降雨衰落的非线性影响,提高了卫星通信的可靠性,并对该方法进行了仿真验证;仿真结果表明:在基于Mie散射理论建立的雨衰信道模型下,当信噪比大于20dB时,16APSK的误码率明显低于16QAM的误码率,因此在受雨衰影响的卫星通信信道中,16APSK调制方法与16QAM调制方法相比可以有效地抵抗降雨衰落的影响。 相似文献
1