Moreover , new close - form ber expressions of mqam and mpsk in nakagami - / ? ? fading channel are derived , which include the known analytical results as a special case 本文还导出了nakagami - m衰落信道下mqam和mpsk调制方式新的误比特率表达式，该表达式可以使现有文献的分析结果西南交通大学博士研究生学位论文第v页成为其特例。
Performance simulation of the proposed estimator including mean squares error ( mse ) of channel and uncoded bit error rate ( ber ) have been taken , and the results show the estimator is efficient and very flexible 对信道盲估计的均方误差( mse )和由此算法获得的信道的状态信息，对无编码的ofdm系统进行解一调的误比特率进行了仿真。
In com - parison with fec system , the harqs can greatly improve the reliability of the system even if only one retransmission is provided , and simultaneously , the average delay and throughput can be guaranteed 与前向差错控制( forwarderrorcontrol ， fec )技术相比，该harq仅重传一次时对误比特率亦有明显改善，同时保证了较低的时延和较高的流量。
Because of huge data quantum and high demand of channel bit error rate for video transmission , and fallibility , time variability and limited band of wires channel , wireless video system is faced with lots of problems 由于视频业务的数据量大、对误比特率要求高，无线信道又具有易错、时变和带限的特点，因此信道的误比特率要比有线环境大得多，且随着基站和终端位置、方向的改变而变化很大。
In the new model , the legitimate partners can control the error bit rate of the eavesdropper ' s channel by adjusting their virtual binary symmetric channels . when our new model is implemented , the problem of receiving synchronization of the partners will not occur 在该模型中，通信双方使用虚拟的二元对称信道来控制窃听方接收信道的误比特率，而且使用该模型也不存在信息接收同步的问题。
In communication systems like this , on account of nonlinearity which may arouse intermodulation of power amplifier may bringing the increaseing of ber because interferes from adjacent channel . hence , we did the analysis of relationship between im3 and ber in the system 但是在正是因为采取这种调制方式,由于功率放大器的( pa )非线性失真会引起交调效应产生同频及邻频信道的干扰而使误比特率( ber )增加。
This thesis presents a forward error correction ( fec ) algorithm and its circuit implementation , which is used in the wireless digital audio transmission system . also , an entire demo platform is built and error - correction ability of the system is tested based on this platform 本文研究了一种应用于数字音频无线传输系统中的前向纠错( fec )算法和相应的电路设计,搭建了一个硬件验证平台,并在验证平台上完成了电路的误比特率测试。
By utilizing the main advantages of orthonormalization and power conservation from hilbert transformation , it is found that bit error rate is close to that of dcsk system , but transmission speed is one time higher than that of dcsk system , and the system ' s output variance is effectively reduced 基于qpsk的思想，引入qcsk调制方式，利用hilbert变换对正交且能量守恒的特性，有效减小了系统输出的方差，较dcsk系统，传输速率提高一倍，系统误比特率与dcsk系统相近。
Comparing with si ( sin ( x ) / x ) interpolator , cubic interpolator with low pass filter , and winner interpolator in 16qam ofdm system both in mean square error and bit error rate without encoding , the results of the method proposed by this thesis show that the performance is better than si interpolator and cubic interpolator with low pass filter , and close to the winner interpolator but the complexity is much lower than the latter 在16qamofdm系统中，将其与带低通滤波器的si ( sin ( x ) / x )插值法、 cubic插值法和winner插值法进行了信道估计的均方误差和无编码的误比特率的仿真结果进行了比较。结果表明，本方法的估计性能优于si和cubic插值法，接近优化的winner插值法，但其计算复杂度与winner插值法相比却大大降低。
The design results arise from the simulations . some key techniques for chaos - based ds - cdma systems are studied in chapter 5 . systemic optimizing is achieved by combining the three main parts respect to systemic performance under the conditions that the bit error rate is minimized 4 、本文的第五章讨论了混沌多址通信的关键问题，从系统优化的角度出发，混沌通信中的关键技术研究将影响ds一cdma系统在多径传播条件下的传输性能的三个主要因素结合起来考虑，在系统误比特率最小的条件下进行优化。
