空時(shí)頻移鍵控(ST-FSK)的分離ML信號(hào)檢測(cè)方法
Implementation of ST-FSK Detection Based on Decoupled Maximum Likelihood Detection
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摘要: 該文提出一種分離最大似然(ML)信號(hào)檢測(cè)方法，在信道狀態(tài)信息已知的假設(shè)下，利用信號(hào)的正交性特點(diǎn)，使多個(gè)接收矢量的ML聯(lián)合檢測(cè)問(wèn)題分離為若干個(gè)矢量的單獨(dú)ML檢測(cè)問(wèn)題。若采用合適的信道估值算法，在運(yùn)算量上不僅大大低于非相干檢測(cè)，還能獲得性能的提高。仿真實(shí)驗(yàn)驗(yàn)證了算法的有效性。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]蔣慧娟，沈越泓. 用QR分解算法實(shí)現(xiàn)ST-FSK的ML檢測(cè)器.已投通信學(xué)報(bào).[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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