The Implementation Of Performance Of Multi-antenna Technology In Affiliated Public Control Channel Of Wcdma System

WCDMA system is one of 3G standards, and this system has larger system capacity, better communication quality, higher security property, and the business of broadband integrated services digital net can be extended into mobile environments. WCDMA system can provides users including voice, data, mobile broadband multimedia services, etc. In order to satisfy the wireless broadband data service business and the large demand for wireless communication system, the highest rate of transmission and capacity are put forward to meet higher request. How to use the radio spectrum resources to meet the increasing demand of communication becomes an important research topic. Therefore, we must seek wireless communications technological innovation to improve the information transmission rate, thus, the problem of wireless communication system could be solved.In a single antenna link system, no matter how advanced encoding technology adopted, only can make system capacity to Shannon limit, which in practice is often not enough. Under the situation of the quality of wireless doubled with data rate of modern communications, that is an important technological breakthrough which use of wireless communication, multipath to establish parallel transmission channel. In comparison with the traditional single antenna system, the capacity of the system can be improved, utilization rate of the system frequency band can be improved by using Multi-input multi-output (MIMO) technology. Thus, the system could transmit higher rate of data under finite radio band. This becomes a new generation of high rate of data, data types and key technologies of wireless communication system. Multi-input multi-output (MIMO) technology is a standard options, HSDPA as an enhanced WCDMA technology is adopted to improve the system capacity multiple-input multiple-output (MIMO) technology and the descending of the data rate.Because the data transmission channel WCDMA system in the physical is mapped to S-CCPCH channel, based on WCDMA system in public physical channel, auxiliary control system is discussed in the application of the technology, and the multiple-input multiple-output (MIMO) computer simulation is carried out. The main job is followed as:The channel capacity for MIMO systems theoretically is analyzed, several typical system channel capacity of computer is simulated. It compares the differences between channel capacity, the simulation results prove that the theory is correct, and the number of antenna effecting the channel capacity is analyzed, and the characteristics of wireless channel MIMO system channel model is established.Papers on S-CCPCH channel simulation system is completed in the functional modules of MATLAB. In the basic S-CCPCH channel simulation link, STTD transmission diversity and receive diversity is increased. Using pilot channel estimation, USES symbols RAKE receiver, coherent double antenna, double receiving antenna model is established.On the condition of the same total power assumption precondition, simulation compared single antenna, single receiving antenna and double antenna, double receiving antenna bit error rate (ber) rate, we can obtain that multiple-input multiple-output (MIMO) system ber performance is far superior to SISO system. And with the signal-to-noise ratio increases, the simulation the gain of MIMO systems channel approaches the theoretical value.In the end, some problems to be solved and the emphasis next step in the field are summarized, and the development trends are discussed.