Title :
Space-time adaptive interference-canceling equalizer for W-CDMA with known and unknown interference
Author :
Chen, Hsiao-Yung ; Lee, Yumin
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
Space-time parallel interference cancellation (ST-PIC) is an effective multi-stage multiuser detection scheme for wideband code-division multiple access (W-CDMA). However, the realization of ST-PIC requires accurate channel estimate, a sufficient number of stages, and knowledge of all user´s spreading waveforms. With inaccurate channel estimate or insufficient number of stages, the residual multiple access interference (MAI) degrades performance significantly. Furthermore, the performance of ST-PIC is also affected by the presence of interference for which the spreading waveforms are unknown. This paper introduces a new structure for enhancing the performance of ST-PIC in these situations. Simulation results show that a bit error rate (BER) reduction of as much as an order of magnitude is achievable using the proposed structure in the presence of strong MAI.
Keywords :
adaptive equalisers; adaptive estimation; adaptive signal detection; channel coding; code division multiple access; error statistics; interference suppression; mobile radio; multiuser channels; BER; MAI; ST-PIC; W-CDMA; adaptive equalizer; bit error rate; channel estimate; direct-sequence code division multiple access; known interference; multi-stage multiuser detection; multiple access interference; space-time parallel interference cancellation; spreading waveforms; unknown interference; wideband code-division multiple access; Bit error rate; Degradation; Design for disassembly; Equalizers; Fading; Interference cancellation; Multiaccess communication; Multiple access interference; Multiuser detection; RAKE receivers;
Conference_Titel :
Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE
Print_ISBN :
0-7803-7376-6
DOI :
10.1109/WCNC.2002.993501