Performance analysis and simulation of pi/4 DQPSK system with diversity combining schemes in wireless communication channel

• Main Authors: Chang, G.J., 張智杰
• Other Authors: M.K. Tsay
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/91675195763929620171

碩士 === 國立中央大學 === 電機工程學系 === 86 === The performance of diversity combining technique with pi/4 differential quadrature phase shift keying is investigated in wireless communication channel. The transmission system model consists of the transmitter with a raised cosine filter and the receiver with diversity. The channel is modeled as frequency selective fast Rayleigh or Rician fading. The diversity combining with differential detection is applied to improve the system performance and to reduce the hardware complexity. A method to cascade multiple stages with various combining schemes will more effectively combine the received diversity branches. The simulated and analyzed outcomes are obtained to present the performance of variable numbers of branches with different combining schemes. The numerical results indicate the details of the system performance in fading environment attenuated by Doppler effect and delay spread. The multiple stage combining shows benefits to have comparative performance while gives the flexible choices of hardware complexity order in each stage.