The Application And Study Of The Constant Modulus Algorithm In The Adaptive Array Antenna

The paper introduces one of the hottest spots in the communication and signal processing fields, adaptive beamforming algorithm' s basic technology, principle, history development and future. Because of its merits that do not need reference signal, blind beamforming algorithm has becoming the research goal of many specialists and scholars in the world. The paper major in researching one kind of important algorithm in the blind beamforming-the constant modulus algorithm.The constant modulus signal is one kind of the more important communication signals. Especially in CDMA system, most signals are constant modulus. And the constant modulus algorithm(CMA), which is used special of the constant modulus signal, has so many marked merits that easily computing, simply realized, unsensitivity to the error of the array model. So CMA has drawn more and more attention of the scholar of the world. The paper study systemicly the convergence behavior of CMA. Emulation shows that the performance of CMA is good. The paper presents the algorithm of LS-CMA and muticonstant algorithm on the base of CMA.But we should now that CMA and other blind beamfarming algorithms are still in developing, and they could not used in real adaptive array system due to the speed of system processing.