空时频移键控(ST-FSK)的分离ML信号检测方法
Implementation of ST-FSK Detection Based on Decoupled Maximum Likelihood Detection
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摘要: 该文提出一种分离最大似然(ML)信号检测方法，在信道状态信息已知的假设下，利用信号的正交性特点，使多个接收矢量的ML联合检测问题分离为若干个矢量的单独ML检测问题。若采用合适的信道估值算法，在运算量上不仅大大低于非相干检测，还能获得性能的提高。仿真实验验证了算法的有效性。Abstract: This paper presents a decoupled maximum likelihood(ML) detection algorithm, which utilizes the orthogonal characteristic of signal, decoupled the combined ML detection into separated one, under the assumption that CSI is known at the receiver. Utilizing appropriate channel estimation algorithm, the decoupled algorithm not only sharply reduces the computational complexity compared to the noncoherent ML detection, but also improves the performance. Simulation results confirm the effectiveness of the algorithm.
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Letus G., Zhao W L, Giannakis G B, et al.. Space-time frequency-shift keying. IEEE Trans. on Commun., 2004, 52(3): 346.349.[2]蒋慧娟，沈越泓. 用QR分解算法实现ST-FSK的ML检测器.已投通信学报.[3]Hochwald B M, Marzetta T L, Unitary space-time modulation for multiple-antenna communications in Rayleigh fading. IEEE Trans. on Inform.Theory, 2000, 46(3): 543564. .[4]Alamouti S M, A simple transmit diversity scheme for wireless communications. IEEE J[J].on Select. Areas Commun.1998, 16(10):1451-[5]Tarokh V, Jafrakhani H, Calderbank A R. Space-time block codes from orthogonal designs[J].IEEE Trans. on Inform. Theory.1999, 45(7):1456-[6]G.Larsson E, Stoica P. Space-Time Block Coding for Wireless Communications. London, UK: Cambridge University, 2003: 79.126. -
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