A DSP-based fuzzy system for real-time interference cancellation in DS-SS systems
نویسندگان
چکیده
This work demonstrates that high-end classical programmable digital signal processors (DSPs) can implement fuzzy systems for real-time communication processing. A systematic procedure to program the DSP is also described. A Fuzzy Narrowband Interference Canceller (NBI) has been designed and its performance compared when its membership functions are triangular or gaussian. Furthermore a comparative study with other cancellers has been carried out.
منابع مشابه
Software-defined radio architectures for interference cancellation in DS-CDMA systems
Third-generation (3G) wireless systems call for strategies that can improve achievable performance and data rates while providing flexibility and affordability. Software defined radio (SDR) technology is promising to provide the required flexibility in radio frequency (RF), intermediate frequency (IF) and baseband signal processing stages. Baseband signal processing techniques such as interfere...
متن کاملAn adaptative method for determination of WDS in a DS/CDMA system
The steeping chip weighting waveforms are used in Multiple Access Interference (MAI) cancellation by emphasizing the received spreading signal, therefore, that allows to solve the problem of orthogonality for the chip waveforms. Our paper presents a useful method based on fuzzy systems to determine the despreading sequences weighted by the steeping chip weighting waveforms for Direct Sequence C...
متن کاملAdaptive Fuzzy-Based PPIC for CDMA Systems Over Frequency Selective Fading Channels
The partial parallel interference cancellation (PPIC) scheme can give an optimal IC by adding a partial cancellation weight (PCW) to each interference cancellation path, in which case the PCW is a fraction of one and reflects the reliability of the tentative decision. Then, that the fuzzy-based PPIC (FB-PPIC) outperforms the conventional PIC and constant weight PPIC over flat fading channels ha...
متن کاملMAI Cancellation in DS/CDMA using a new Approach on WDS
The steeping chip weighting waveforms are used in Multiple Access Interference cancellation by emphasizing the received spreading signal, therefore, that allows to solve the problem of orthogonality for the chip waveforms. The goal of this study was to elaborate a useful method based on fuzzy systems to determine the despreading sequences weighted by the steeping chip weighting waveforms for Di...
متن کاملSpace-Time Joint Interference Cancellation Using Fuzzy-Inference-Based Adaptive Filtering Techniques in Frequency-Selective Multipath Channels
An adaptive minimummean-square error (MMSE) array receiver based on the fuzzy-logic recursive least-squares (RLS) algorithm is developed for asynchronous DS-CDMA interference suppression in the presence of frequency-selective multipath fading. This receiver employs a fuzzy-logic control mechanism to perform the nonlinear mapping of the squared error and squared error variation, denoted by (e2,Δ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001