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境中这种接收机的性能;结果表明,在多用户环境里,这种接收机的抗连续波阻塞干扰性能比传统单用户最佳CDMA接收机更好。考虑到移动通信环境中载波相位的跟踪和估计有时很困难,本章还提出了差分相干同步CDMA信道中的线性单用户检测抗多址干扰技术。本章最后给出了CDMA信道呈Rician衰落时，线性单用户检测抗多址干扰CDMA接收机的性能。
第5章用最优化理论统一表述了功率控制、最佳多用户检测、准最佳多用户检测、预去相关及线性单用户检测抗多址干扰方法,并分别比较了它们的优缺点及适用场合。
ABSTRACT
There are two basic properties in code division multiple access communication systems. One is the “jam” or interference resistant, such as anti-multipath fading, antijamming on purpose or inadvertently. Another is the low probability detection, such as the CDMA system can coexist with narrow band system. Only CDMA communication system possesses these two unique properties, the market of mobile communication that is very brisk at present has to employ CDMA technique. However, conventional CDMA communication system is of serious co-channel interference (multiuser interference), so the spectral efficiency and user capacity of channel is not maximum. In this paper, two methods to reform the structure and decision algorithm of conventional CDMA communication system were given. When the technique of canceling multiuser interference is used ,each user in the mobile terminal has to know the signature waveform ofother user. So it is of a secure problem, the subscriber and the control of system are too complex. The technique of canceling multiuser interference of pre-decorrelation and linear single-user detection studied in this paper is not of these problems above。
In the chapter 1 of 无忧论文 【http://www.uklunwen.com】this paper, the necessity of canceling multiuser interference of CDMA communication system was given. The basic elements of this paper, such as the description of conventional CDMA communication system, the problem of conventional CDMA system, and the studying status of canceling multiuser interference of CDMA communication system were given in chapter 2.
Partial concerned technique of pre-decorrelating canceling multiuser interference ofCDMA system were studied in chapter 3. Because of the transmitted power been one of the most important parameter in space frequency reuse, the statistical properties of the transmitted power of pre-decorrelating transmitter were given. The canceling multiuser interference method of pre-decorrelation in differentially synchronous CDMA channels was proposed .To counter broadband CDMA will be employed in the next generation mobile communication system, the performance of pre-decorrelating CDMA communication system in frequency non-selective Ricican fading channels was given in chapter 3. Single antenna is employed for all the user’s transmitters in basestation to guarantee the signal of all the user which basestation radiate in each way synchronous arrive at each subscriber. Through the study of this chapter, the technique of canceling multiuser interference employed pre-decorrelation is more close to the engineering of mobile communication.
In chapter 4, a anti-multiuser-interference receiver in zero mean noise channels was proposed |
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