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    • 10. 发明授权
    • Computer-based bit error simulation for digital wireless communications
    • 用于数字无线通信的基于计算机的比特误差模拟
    • US5233628A
    • 1993-08-03
    • US706806
    • 1991-05-29
    • Theodore S. RappaportVictor FungMichael D. Keitz
    • Theodore S. RappaportVictor FungMichael D. Keitz
    • H04B17/00
    • H04B17/3912H04B17/373
    • A communications stimulation system allows a user to perform a quantitative or subjective test of digital baseband devices over wireless channels using actual measured or modeled propagation data. The digital wireless communication simulation system is capable of simulating the transient nature of channels and radio hardware so that loss of synchronization can be included in the simulation. The simulator is a combination of computer software and hardware that computes a convolution, in the time domain, of a sequence of binary digits or data symbols (i.e., the data stream) with a computer model of a radio transmitter, a propagation channel or channels and a receiver. The transmitter typically comprises a coder, a pulse shaper, a modulator, and a spreader. The propagation channel or channels may include impulsive and average noise levels, co-channel interference and adjacent interference levels, fading and multipath propagation events, and non-linear channel and radio system effects. The receiver system typically comprises at least a filter bank, a demodulator, a despreader, a synchronizer, a detector, and a decoder. The data stream may either be random or applied by the user. The software computes the bit-by-bit sequence for replay at a later time. Once stored, the bit-by-bit error sequence can be clocked through a hardware data port and compared with an applied data stream in real time. The output of the hardware data port is a real time sequence of bits that has errors due to the bit-by-bit simulation computed earlier by the software.
    • 通信刺激系统允许用户使用实际测量或建模的传播数据通过无线信道对数字基带设备进行定量或主观测试。 数字无线通信仿真系统能够模拟信道和无线电硬件的瞬态特性,从而可以在仿真中包含同步丢失。 模拟器是计算机软件和硬件的组合,其在时域中使用无线电发射机的计算机模型,传播信道或信道计算二进制数字或数据符号(即,数据流)序列的卷积 和接收器。 发射机通常包括编码器,脉冲整形器,调制器和扩展器。 传播信道或信道可以包括脉冲和平均噪声电平,同信道干扰和相邻干扰电平,衰落和多径传播事件以及非线性信道和无线电系统效应。 接收机系统通常至少包括滤波器组,解调器,解扩器,同步器,检测器和解码器。 数据流可以是用户随机的或应用的。 该软件将在稍后的时间内逐行计算重播。 一旦存储,逐位错误序列可以通过硬件数据端口进行计时,并与应用的数据流进行实时比较。 硬件数据端口的输出是由于软件较早计算的逐位仿真而具有错误的实时比特序列。