【正文】 Implementation of ST FSK Detection Based on Decoupled Maximum Likelihood Detection Gao Yuanyuan Shen Yuehong Hu Xianbin (Department of Radio Communication /CE, PLAUST, Nanjing 210007, China) Abstract This paper presents a decoupled maximum likelihood(ML) detection algorithm, which utilizes the orthogonal characteristic of signal, decoupled the bined 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 putational plexity pared to the noncoherent ML detection, but also improves the performance. Simulation results confirm the effectiveness of the algorithm. Key words SpaceTime Frequency Shift Keying(STFSK), Unitary design, Decoupled Maximum Likelihood (ML) detection, Coherent maximum likelihood detection Preface The FSK makes a way is high because of its power utilization, be subjected to the limit letter way in the power thus Win to get extensively applied, if the military corresponds by letter to correspond by letter and satellite, cultural heritage have another antenna The empty hour codes the technique and FSK to make a technique to bine together, acquiring many antennas to bring The cent gathers to increase a benefit, in the benefit decline the letter way under condition didn39。t need letter way information, can adopt not Concern with of biggest however(ML) the detector f}l. Cultural heritage[2)put forward to use matrix is hand over train g le Re solve((QR)calculate way, Be DO I n g not lose the premise of the system function under, lower an operation Quantity, simplify to carry out the plexity of that ML detector. This text puts forward a kind of separation ML signal examination method, being believing an appearance in f or ma t o n The F know of under assumption make use of to send out signal is hand over sex characteristics, make many receive The ML consociation of the quantity examination the problem separate for some vectors alone the ML examination ask .In operating quantity not only consumedly low in above two kinds of not mutually thousand examinations, and get G e t the exaltation of the function big in 3 d B o s Adoption39。s separating the main characteristics of the ST FSK of[with] the ML examination method BE:(1) a do p t Use the real amount full speed rate is hand over a design, be to send out the antenna Acquire the full marks gathers to increase a benefit。(2)STFSK with is hand over FSK to make to have a homology e s p e c I ally O rd e r, then when enter to make a number to tend in endless, can approach the mountain agriculture extreme limit, but with sacrifice The bandwidth usefulness for price。(3)the wood text put forward of the separation ML examination method and text Dedicate[1,2] in of concern with the examination method to pare not, one is a function to is big in 3 dB of good Place , can make to translate the code plications moreover from with send out antenna the index number relation to reduce for Present 、 In order to concerning with an examination to need to know the letter way an appearance information, the abovementioned operation measure of let up Didn39。t consider letter way to estimate value operation to measure, consider M to send out the antenna N to receive a day Line of the MIMO flatness decline the letter way, letter way the variety is opposite to pare slowly, letter way the estimate of adopt While using according to the calculate way of train the sequence, plications and MN that believe a way to estimate to be worth a machine bee just Ratio still is the line sexual behavior namely: if synthesize to consider the letter plications that estimates value to bring, In the antenna count with the FSK