Mimo System Simulation And Implementation Of The Frequency Shift Keying And Convolutional Codes In The Hollow

The Multiple-Input Multiple-Output (MIMO) technology is considered as one of the most promising breakthrough technology,and it is becoming the researched hotspot of the wireless communication fields. Using the channel's multiple path effect, it improves the spectral efficiency and the reliability of the wireless communication. It acquires the space's dispersion in the multiple access environment to make use of many antennas at the transmitter and the receiver. Then it can improve the system's capability under not increasing the system's bandwidth. The modulation,demodulation and the encoder to correct error are both key technology. Now, the digital realization becomes higher than past, they become more important. The topic asks to achieve the non-eye distance transmission by the troposphere's dispersion. The dispersion signals are much unstable, which exist fading ether in the time field or in the spectral field. The modulation way in this article is the space-time frequency shift keying, and the correcting code is the convolutional code. They are combined to descrease the bit error rate. The main contents of this dissertation are showed as follows:1. Summarized the MIMO system's model, and analysed the MIMO system's transmission circumstance, and also surmised the MIMO system's research actuality especially concerned the modulation technology and the correcting code.2. Introduced the space-time frequency shift keying and the convolutional code theory in detail. ST-FSK gathered the coding and modulation, which does not require any channel state information at the transmitter and the receiver. ST-FSK can be viewed as a special unitary ST modulation design. ST-FSK is easier to design, and enjoys lower decoding complexity. ST-FSK allows for a simplified maximum-likelihood (ML) detector. ST-FSK can be adopted in the digital as well as in the analog domain. As expected, all these advantages come at the cost of a decrease in spectral efficiency. The convolutional code is widely applied in the satellite communications and the wireless communications. Coding is easy, and it also could gains upper coding plus. Viterbi decoding arithmetic is easy, and is a very good maximum-likelihood decoding method.3. Made many simulations about the performance after them combined. We obtained the corresponding error-bit rate curve. Then, we carried through the FPGA implementation. ST-FSK modulation made use of looking for table, and the demodulation made use of the time-sharing structure. Viterbi decoding used the serial structure. We improved on the conventional register exchange method to storage the input information directly as the state diversion. It didn't need trace back, and also applied the time-sharing way. We simulated it in the QuartursII6.0 to get the software simulation figure, and downloaded the VHDL program in the FPGA chip to get the hardware simulation figure. Both of the figures proved the design's correctness.