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The difficulty of receiver design in code-division multiple access (CDMA) system is the treatment of multipath fading channels. To overcome this difficulty, the receiver must be robustly designed. In this paper, a novel robust receiver is introduced. A H∞ channel estimation algorithm is proposed to estimate the channels, and then an adaptive decision-feedback equalization (DFE) detector...
This paper introduces the adaptive equalizer of least squares in UWB system. And it is important that this paper finds out a sort of new algorithm bases on UWB system. The new algorithm can solve the contradiction between convergent speeds to sensitivity of noise. Obviously, which is better than RLS algorithm. The simulation indicates that this improved feedback type equalizer has better capability.
In this paper, QR-RLS based IIR adaptive channel TEQ(time domain equalizer) to make the OFDM systems robust for delay spreads exceeding the CP(cyclic prefix) is presented. IIR based TEQ results in much shorter length equalizer compared to FIR based TEQ, at the same time guarantee for global convergence within the training period. The length of zeros of the proposed QR-IIR TEQ is restricted to CP....
Iterative equalization using optimal Multi-User Detector (MUD) & trellis-based channel decoder in coded Code Division Multiple Access (CDMA) systems improves Bit Error Rate (BER) performance. When large number of users is employed in the system over multipath channels, causing significant Multiple-Access Interference (MAI) & Inter Symbol Interference (ISI), the optimal MUD is thus complex...
The requirement of many data communication systems is to employ an adaptive equalizer to minimize the inter-symbol interference. Several adaptive Kalman equalizers have been reported in literature. In these works either the least mean square (LMS) or the recursive least squares (RLS) or the Kalman algorithm have been adopted for channel estimation. The Kalman estimation method can lead to significant...
This paper proposes adaptive baseband compensation method for the OFDM system in the presence of I/Q imbalance of receiver front-end, and Doppler effect of time-varying channel. A paired-tones model is built up for the applications of two adaptive equalizers - the RLS and NLMS. Special scattered pilot tones in V-pattern are used in conjunction with the adaptive algorithms. The impact of Doppler frequency...
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