The cost function of constant modulus algorithm (CMA) is simplified to meet second norm form, and the blind equalizer can use recurrent least squares (RLS) algorithm to update the weights. Considering the underwater acoustic channel is usually nonlinear, decision feedback equalizer is used as the blind equalizer. According to the simplified cost function of CMA, the weights of forward part and ...

In this paper, we propose new time-domain and per-tone frequency-domain equalization techniques for OFDM transmission over timeand frequencyselective channels. We present one mixed timeand frequency-domain equalizer and one per-tone frequency-domain equalizer. The mixed timeand frequency-domain equalizer (MTFEQ) consists of a one-tap time-varying (TV) time-domain equalizer (TEQ), which converts...

This paper presents an improved approach to the synthesis and implementation of digital filters employed for multiple position equalization of a room transfer function. First, we propose a more effective way of deriving the desired frequency response of the equalizer than the Levinson-Durbin algorithm employed by well-known method used here as a reference to compare against. Second, the equaliz...

Optimal methods for designing multiplierless finite-impulse response (FIR) and infinite-impulse response (IIR) filters with cascaded prefilter-equalizer structures are proposed. Assuming that an FIR filter consists of a cyclotomic polynomial (CP) prefilter and an interpolated second order polynomial (ISOP) equalizer, in the proposed method, the prefilter and equalizer are simultaneously designe...

Function Equalizer Design Sarat Kumar Patra , Bernard Mulgrew Dept of Electrical Engineering, University of Edinburgh, Edinburgh, EH9 3JL, UK. Tel: +44 131 6505655; fax: +44 131 650 6554 e-mail: [email protected] ABSTRACT This paper investigates the computational aspects of radial basis function (RBF) equalizers. In an RBF implementation of the Bayesian equalizer the RBF centers are placed at equ...

This paper presents a new kind of adaptive filter: type-2 fuzzy adaptive filter (FAF); one that is realized using an unnormalized type-2 Takagi–Sugeno–Kang (TSK) fuzzy logic system (FLS). We apply this filter to equalization of a nonlinear time-varying channel and demonstrate that it can implement the Bayesian equalizer for such a channel, has a simple structure, and provides fast inference. A ...

This paper investigates on the performance comparison of m x n equalizer based maximum likelihood (ML) and minimum mean square error (MMSE) MIMO receiver for wireless channel. The effect of fading and interference effects can be combated with equalizer. This paper also analyses the performance of MMSE equalizer based receiver for MIMO wireless channel. The bit error rate (BER) characteristics f...

Existing blind adaptive equalizers that use nonconvex cost functions and stochastic gradient descent suffer from lack of global convergence to an equalizer setup that removes sufficient IS1 when an FIR equalizer is used. In this paper, we impose convexity on the cost function and anchoring of the equalizer away from the all-zero setup. We establish that there exists a globally convergent blind ...

This paper introduces a new receiver for joint blind equalization and carrier phase recovery. The new receiver overcomes several disadvantages available in literature in this area by accomplishing modulus equalization and phase recovery in two independent operations. The proposed structure enables alternative and independent approaches to be taken for the design of the modulus and phase equaliz...

Channel equalization problem is an important problem in high-speed communications. The sequences of symbols transmitted are distorted by neighboring symbols. Traditionally, the channel equalization problem is considered as a channel-inversion operation. One problem of this approach is that there is no direct correspondence between error probability and residual error produced by the channel inv...