The study conclusions of the dissertation indicated the mixed qr _ rls / lms adaptive equalization with dfe structure can eliminate the isi of communication system and reduce the bit error rate of the system 研究结果表明,采用dfe结构的混合型qr _ rls / lms算法能够消除数传系统中的码间干扰,降低误码率,起到了均衡的作用。
The structure and theory bit error rate of these schemes are introduced in this thesis . variable spreading gain cdma system is a candidate system that accommodates mixed traffic types , and supports variable data rate service 论文深入研究了cdma中的两种多速率方案,即可变扩频增益方案( ovsf )和多码方案( mc - cdma ) 。
The matlab simulation result shows that if the bit error rate has the order of 10 - 4 , and 16 - qam constellation modulation is applied , this technology is capable of reducing amplifier optimized output back - off by 7db Matlab仿真结果表明在误比特率为10 ? 4时,采用16 - qam的星座调制方式,该技术能将放大器的最优回退减小7db 。
Recently , much interest of the coding community has focused around a new family of error - correcting codes , called turbo codes , whose perfor - mances in terms of bit error rate ( ber ) are close to the shannon limit Turbo码作为一种新型的纠错编码类型备受通信界的注目,它的纠错能力能够接近shannon极限。 turbo码自1993年由c
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。
The method is given to solve the problem in adaptive demodulation that adjudgement will worsen when the snr is low . by using the error signals to reduce the demodulated signals , the bit error rate will be improved 仿真中,针对dpsk信号的自适应解调中小信噪比下门限失效的问题,提出了利用误差改进门限判决的方法,将误码性能提高了1 2db 。
Then , we proposed a new qos protocol , qgr , based on the greedy geographic routing and dynamic source routing . qgr protocol searches the best route for the packet using energy 、 packet delay and bit error rate of manet as qos parameter Qgr协议是一种qos路由协议,以传感器网络的能量、延迟、位错误率等特征作为qos参数,实现相对于某一种参数最优的路由路径的查找。
( 1 ) for wireless physical layers , the efficiency function is defined to quantify the upper layer throughput per unit of wireless resources while maintaining a certain maximum remnant bit error rate subjected to a certain snr ( 1 )针对无线物理层,引入效率函数来表征在一定残余误码率ber要求和一定信道信噪比snr情况下,上层应用正确传输的数据量和下层无线资源的关系。
Conclusions can be made that nlms equalizer is the best among three equalizers in terms of convergent stability and calculating complexity , kalman equalizer is the best among three equalizers in terms of bit error rate 仿真试验结果表明,在这三种均衡器中,从收敛稳定性和计算复杂度上来看最适合的是nlms线性均衡器;从系统误码率上来看,最适用的是kalman线性均衡器,其次是nlms线性均衡器。
The multipath interference , resulted from interfering between the signals of the line of sight ( los ) and the line of ground reflection in vhf - rc , makes bit error rate of data transmission increased and system reliability attenuated 当前,中国水波中继信道以直视路径传播为主,同时存在地面折射路径对直射信号产生干涉,造成多径干扰。这种干扰使得信号传输的误码率上升,系统可靠性下降。
In digital transmission, the number of bit errors is the number of received bits of a data stream over a communication channel that have been altered due to noise, interference, distortion or bit synchronization errors.