The Performance Analysis Of Space-Time Trellis Codes Over Fading Channels

With the increasing of wireless communication and broad-band data service, the frequency resources become more limited. How to make use of the limited communication resources efficiently has been the focus of the development of new wireless communication. The multiple-input multiple-output (MIMO) technology is an important breakthrough in the area of wireless communication. Being the key technology of new generation mobile communication systems, it can be used to improve the capacity, signals error probability and frequency efficiency significantly without extra frequency bandwidths and transmitted power. Space-time coding for MIMO systems is a new coding and signal processing technique for wireless communication systems. It uses the space diversity technique on the multiple-input multiple-output channels to provide diversity advantage and coding gain for wireless communications.By combining coding techniques with modulation, Space time trellis codes (STTC) can reach the compromise of Encoding Complexity, performance and frequency efficiency, which is regarded as the optimum code. This thesis mainly deals with the performance of STTC over different fading channels. Utilizing the moment generating function (MGF)-based approach, the exact expressions for the pairwise error probability (PEP) of STTC over Rician and Nakagami-m fading channels are derived in terms of the single variable integral form. With QPSK and 8PSK modulations, an analytical estimate for bit error rate (BER) is evaluated over slow and fast fading channels, respectively. Monte Carlo simulations are used to simulate the whole communication process with the simulation results given to testify the theory results. In addition, in this thesis, performance of the frame error rate over correlated Nakagami-m fading channels is analyzed with simulation results given, which contributes greatly to investigating the performance of STTC further.It is noted that aforementioned researches are performed in Gaussian white noise. However, the non-Gaussian noise in the realistic communication systems is prevalent. Therefore, this thesis is also concentrated on the performance analysis of STTC in non-Gaussian noise environments. Some kinds of typical non-Gaussian models are introduced. Based on the investigation of the performance analysis for STTC in Gaussian noise environments, performance simulations of STTC are performed in typical Middleton Class A noise, also a comprehensive discussion on simulation results is made.