Title :
A new study on VCMA-based blind equalization for underwater acoustic communications
Author :
Qin Qin ; Li Huahua ; Jiang Tingyao
Author_Institution :
Coll. of Comput. & Inf. Sci., China Three Gorges Univ., Yichang, China
Abstract :
In underwater acoustic digital communications, the decline of communication quality caused by multi-path effects, was considered the biggest obstacle at underwater acoustic. The most effective way is to use the equalizer. Compared with the conventional adaptive equalization, blind equalization without resorting to a training sequence, can improve the efficiency of the communication system. In order to solve the contradiction between convergence speed and steady-state error in constant modulus algorithm (CMA), we studied variable step-size constant modulus algorithm (VCMA). Theory and simulation, especially tracking constellation figure, indicate that, compared with the traditional constant module blind equalization algorithm, VCMA algorithm has the quicker convergence rate and smaller stable remainder error, and achieve the purposes of equalization.
Keywords :
adaptive equalisers; blind equalisers; underwater acoustic communication; VCMA-based blind equalization; adaptive equalization; convergence speed; remainder error; steady-state error; underwater acoustic digital communications; variable step-size constant modulus algorithm; Algorithm design and analysis; Blind equalizers; Constellation diagram; Convergence; Signal processing algorithms; Underwater acoustics; Blind equalization; CMA; Underwater acoustic communication; VCMA;
Conference_Titel :
Mechatronic Sciences, Electric Engineering and Computer (MEC), Proceedings 2013 International Conference on
Conference_Location :
Shengyang
Print_ISBN :
978-1-4799-2564-3
DOI :
10.1109/MEC.2013.6885616