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In digital communications, the modified constant modulus algorithm (MCMA) is known to outperform the constant modulus algorithm (CMA) considerably. However in underwater acoustic communications which occur seriously multipath fading and Doppler frequency shift, the MCMA only achieves moderate convergence rate and steady-state mean square error (MSE). So a new modified constant modulus algorithm is...
A simple method for joint blind equalization and detection of QAM and PAM transmissions is presented. By studying the geometrical relations between the rectangular QAM signal constellation and PAM signal constellation, a novel cost function including blind equalization and detection of them is defined. Such cost function-based the improved constant modulus algorithm (CMA) transforms the coordinates...
In digital communication system the Constant Modulus Algorithm (CMA) based FIR equalizer is by far the most popular blind equalization to combat the Inter-Symbol Interference (ISI). The major problem of CMA, however, is that it only achieves moderate convergence rate and steady state mean square error (MSE). Furthermore, the CMA and such blind equalization techniques must rely on the observations...
A new concurrent scheme for blind equalization suitable for 16-QAM signal is proposed. It combines modified modulus algorithm (MCMA) and modified decision directed (MDD) algorithm. By exploiting the inherent structural relationship between the 4-QAM signal's coordinates and 16-QAM signals' coordinates, another style of cost function for constant modulus algorithm (CMA) is defined, and we have proved...
A blind equalization and order detection algorithm suitable for QAM signal is proposed. By exploiting the inherent structural relationship between the 4-QAM signal's coordinates and other higher-order QAM signals' coordinates, a novel cost function including channel blind equalization and signal order detection is defined. In such method, by changing the coordinates of input signals, higher-order...
The paper proposes a concurrent scheme for blind equalization suitable for high-order QAM signals; this scheme combines Modified Modulus Algorithm (MCMA) and Decision Directed (DD) algorithm. The proposed algorithm makes full use of the advantages of MCMA and DD algorithm and these two algorithms operate concurrently. Furthermore, in such algorithm a novel rule to control the adjustment of DDpsilas...
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