适合高阶QAM信号的加权多模盲均衡算法
doi: 10.3724/SP.J.1146.2005.01422
Weighted Multimodulus Blind Equalization Algorithm for High-Order QAM Signals
-
摘要: 该文提出了一种加权多模盲均衡算法。该算法结合了多模盲均衡算法和判决引导算法的各自优势，利用由判决符号的指数幂构成的加权项调整代价函数中的模值。在均衡器系数迭代过程中，加权项不仅随着判决符号自适应地改变，还可以根据MSE估计值作更精确地调整。理论分析和仿真结果表明，与多模盲均衡算法等其它算法相比，该文提出的算法在同等条件下可以获得更快的收敛速度和更低的稳态收敛残差，更适用于高阶QAM信号。Abstract: A new weighted multimodulus blind equalization algorithm is proposed in this paper. The proposed algorithm, which combines the benefits of the MultiModulus Algorithm (MMA) and the Decision-Directed Algorithm (DDA), utilizes exponential weighted symbols of the slicers output to adjust the modulus in the cost function. During the equalizer tab update process, the weight term varies according to the decided symbols as well as the MSE estimation for more accurate adjustment. Analysis and simulation results demonstrate that compared with other blind equalization algorithms including MMA, the proposed algorithm provides superior performance by increasing the convergence rate and decreasing the steady-state mean square error, which is more efficient for high-order QAM signals.
-
Sato Y. A method of self-recovering equalization for multilevel amplitude modulation systems[J].IEEE Trans. on Commun.1975, 23(6):679-682[2]Godard D N. Self-recovering equalization and carrier tracking in two-dimensional data communication systems IEEE Trans. on Commun., 1980, 28(11): 1867-1875.[3]Benveniste A and Gourst M. Blind equalizers[J].IEEE Trans. on Commun.1984, 32(8):871-883[4]Godard D N and Thirion P E. Method and device for training an adaptive equalizer by means of an unknown data signal in a QAM transmission system. U.S. Patent, 4 227 152, Oct. 7, 1980.[5]Picchi G and Prati G. Blind equalization and carrier recovery using a stop and go decision-directed algorithm[J].IEEE Trans. on Commun.1987, 35(9):877-887[6]Abrar S. Compact constellation algorithm for blind equalization of QAM signals. IEEE International Conference on Networking and Communication, Lahore, Pakistan, 11-13 June 2004: 170-174.[7]Yang J, Werner J J, and Dumont G A. The multimodulus blind equalization and its generalized algorithm[J].IEEE Journal on Sel. Areas in Commun.2002, 20(5):997-1015[8]Labat J and Macchi O. Adaptive decision feedback equalization: can you skip the training period?[J].IEEE Trans. on Commun.1998, 46(7):921-930 -
计量
- 文章访问数: 3228
- HTML全文浏览量: 85
- PDF下载量: 1374
- 被引次数: 0
下载:
