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。
Besides , traditional modes , such as am and fm without spread spectrum , cannot meet requirements of hydrologic data transmission in the adverse circumstances during the high - water or tide season , since those modes are easily interfered and have high bit error rate 另外,传统的调幅、调频等通信方式亦存在易受干扰、误码率高等缺点,在信道环境恶劣的汛期往往不能满足水文数据传输的要求。
On the basis of sga , the validity of improved gaussian approximation ( iga ) method is established in our systems and the accuracy of the bit error rate expression obtained via siga is demonstrated with monte - carlo simulations 在此基础上证明改进型高斯近似法( improvedgassianapproximation ,简称iga )在本文所述系统中的适用性,并利用其简化算法( simplifiediga ,简称siga )得到简洁的误码率近似表达式。
This thesis researched the time synchronization method for 2d - ss system , and deeply discussed the bit error rate ( ber ) performance of multicarrier domain spread spectrum chip - level differential detection ( mc - ss - cldd ) in the presence of multi - user interference 本论文从多载波扩频通信系统出发,提出了广义二维扩频系统的同步算法,并对多载波频域扩频码片级差分检测技术在多用户情况下的系统性能进行了深入的研究。
2 . with the principles of statistical signal processing theory and density function estimating theory , the minimum bit error rate ( mber ) mud and the least bit error rate ( lber ) mud using optimum designing methods under synchronous ds - cdma downlink are studied . 3 以统计信号处理理论和密度函数估计理论为基础,利用最优化设计方法在同步ds - cdma系统的下行链路研究了最小误码率多用户检测器及自适应实现的lber多用户检测器。