Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs, and reduces the required transmission bandwidth b...Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs, and reduces the required transmission bandwidth by up to 80%. In addition you get improved voice quality and better QoS.展开更多
Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs,
Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs,
This paper presents an improved error function of dithered signed-error constant modulus algorithm (IDSE-CMA) for blind multiuser interference suppression in DS/CDMA systems. It uses a different error function to re...This paper presents an improved error function of dithered signed-error constant modulus algorithm (IDSE-CMA) for blind multiuser interference suppression in DS/CDMA systems. It uses a different error function to replace the former one in sign operation of the DSE-CMA and compares their performance in multiple access interference (MAI) suppression ability. Simulations indicate that the new algorithm has better performance than the similar CMA in terms of convergence speed and steady-state performance:展开更多
针对水声无线传感器网络基于CDMA组网的需求,提出了一种支持CDMA机制的水声扩频通信系统UADSSS/CDMA(a Direct Sequence Spread Spectrum based Underwater AcousticCommunication System for CDMA based Networks)。系统采用直接序列...针对水声无线传感器网络基于CDMA组网的需求,提出了一种支持CDMA机制的水声扩频通信系统UADSSS/CDMA(a Direct Sequence Spread Spectrum based Underwater AcousticCommunication System for CDMA based Networks)。系统采用直接序列扩频方式,调制方式为BPSK/QPSK,信道编码采用RA码。为了降低接收机的相位捕获复杂度,发射机采用扩频码相位和载波相位同相的载波调制方式。接收机采用基于带通信号捕获的方法,支持码分多址访问,捕获算法为延迟相关捕获算法;采用先解扩后解调的系统结构,提高系统的通信速率。进行了基于MATLAB的仿真和基于实验系统的验证。仿真和实验结果表明,系统在抑制多径干扰和支持多用户通信方面具有良好的性能,在具有两个用户通信干扰的水池环境下,系统误码率为10-3数量级。展开更多
摘要Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs, and reduces the required transmission bandwidth by up to 80%. In addition you get improved voice quality and better QoS.
摘要Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs,
摘要Our new All-IP CDMA2000 solution is the first IOS V5.0-based system to be launched commercially. This evolutionary system gives you up to 30% savings on vocoder costs,
基金Project supported by National Natural Science Foundation of Chi-na(Grant No .60172018)
摘要This paper presents an improved error function of dithered signed-error constant modulus algorithm (IDSE-CMA) for blind multiuser interference suppression in DS/CDMA systems. It uses a different error function to replace the former one in sign operation of the DSE-CMA and compares their performance in multiple access interference (MAI) suppression ability. Simulations indicate that the new algorithm has better performance than the similar CMA in terms of convergence speed and steady-state performance:
摘要针对水声无线传感器网络基于CDMA组网的需求,提出了一种支持CDMA机制的水声扩频通信系统UADSSS/CDMA(a Direct Sequence Spread Spectrum based Underwater AcousticCommunication System for CDMA based Networks)。系统采用直接序列扩频方式,调制方式为BPSK/QPSK,信道编码采用RA码。为了降低接收机的相位捕获复杂度,发射机采用扩频码相位和载波相位同相的载波调制方式。接收机采用基于带通信号捕获的方法,支持码分多址访问,捕获算法为延迟相关捕获算法;采用先解扩后解调的系统结构,提高系统的通信速率。进行了基于MATLAB的仿真和基于实验系统的验证。仿真和实验结果表明,系统在抑制多径干扰和支持多用户通信方面具有良好的性能,在具有两个用户通信干扰的水池环境下,系统误码率为10-3数量级。