The Application And Performance Analysises Of TDA Equipments On The CDMA 1X Network

In the first, this paper describes the notion of cdma(code division multiple access) and its technologic features, and introduces TDA(Transmission Division Assembly). Afterwards, it expounds the architecture of TDA, its technologic features, and correlative test and analysises.With the increasing number of subscribers on the cdma network, the problem of short power of bts(base transmission and receiver station) and fast fading in the mobile communication environment limit access of more subscribers, which is needed to solve. According to the technologic feature of cdma that the terminal can support soft handoff by Rake receiver, TDA may be designed and applied on the cdma network.In the system of TDA, the transmission division is only applied by the side of bts. Weak signal is coupled from the cable of the output amplifier of the sector, then is transmitted to the TDA equipment, where the signal is sampled, amplified, and is outputed to the receiver cable with certain time delay. Thus, the processed signal will cooperate with the initial output signal, which realizes transmission division of the output signal. In this case, mobile terminal isn't needed to modify or to replace.After this paper sets forth the architecture and technologic features of TDA, it elaborates the correlative tests, including basic radio system test, application performance test, and application in miniature on the cdma network. By analyzing the performance of TDA in respective circumstances, it verifies two capabilities of TDA over the cdma network: 1) it can enhance the coverage area of forward link; 2) it can increase the power capacity of forward link.The author of this paper analyzes deeply the actuality of cdma network, and introduces the TDA technology with his colleagues. According to the test data, correlative analysises and summing-up are accomplished,which will make technologic base to the actual application of TDA on the cdma 1x network.