A Study of Multistage Parallel Interference Cancellation Receiver in Wideband CDMA System

• Main Authors: Wei-Yun Chang, 張維盷
• Other Authors: Che-Ho Wei
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/99082851250069824779

碩士 === 國立交通大學 === 電子工程系 === 88 === The wideband direct-sequence code division multiple access (W-CDMA) transmission technique has been widely investigated and also has become to standard of UMTS/IMT2000 for the third generation (3G) mobile communication systems. In this thesis, various parallel interference cancellation (PIC) receivers with 3G standard are studied. The multistage partial PIC (PPIC) receiver is demonstrated to provide more robust performance than other PIC schemes. The performance comparisons are achieved by computer simulations. We also study the pilot-channel-aided channel estimation for the PPIC receiver in multipath fading environment. A multistage channel estimation scheme, which makes use of a multistage PPIC scheme, is proposed to improve the accuracy of the channel estimation. We also show the impairment of the multiple　access interference (MAI) due to pilot channel signals. A modified PPIC (MPPIC) receiver, which performs pre-cancellation of the pilot channel signals before parallel interference cancellation processes, is proposed to reduce this effect. From the simulation results, we can show that MPPIC receiver with multistage channel estimation will improve performance and increase link capacity of the wideband CDMA system.