A Channel Estimation Method for Marine Communication System
A technology of channel estimation and marine communication, which is applied in the field of channel estimation of marine communication systems, and can solve problems such as non-sparseness
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Embodiment 1
[0079] Such as figure 1 The schematic diagram of the UVLC system based on FS-OOFDM is shown, wherein the OOFDM scheme adopts direct-current-biased optical-orthogonal frequency division multiplexing (Direct-current-biased Optical OFDM, DCO-OFDM). For the convenience of description, it is assumed that n, m and k denote the subscripts of OOFDM symbols, oversampling offsets and subcarriers, respectively. At the transmitter, the modulation symbol X for each subcarrier n,k Represents data or pilot, and satisfies the power normalization condition E{|X n,k | 2}=1. The pilot format adopts a comb structure, and the corresponding subcarrier subscript is p i , 0≤i≤K p -1, where K p Indicates the number of pilots contained in one OOFDM symbol. In addition, X n,k Satisfy Hermitian Symmetry (Hermitian Symmetry, HS), namely and X n,0 =X n,K / 2 =0. Next, according to figure 1 The operation shown is for the frequency-domain symbol X n =[0,X n,1 ,K,X n,K-1 ] T Subsequent process...
Embodiment 2
[0101] In the specific implementation process, due to the inaccuracy of the transmission and reception caused by the movement of the UE, the CIR prior information μ h,n and C h,n Changes with the location, and the receiver needs to estimate the noise power. Therefore, it is necessary to further consider the estimation of noise power and the prior parameter μ in the OSMF-CE scheme h,n and C h,n The self-adaptive update of AOSMF forms a solution suitable for UE mobile scenarios, which is called the AOSMF-CE solution. next to figure 2 The AOSMF-CE scheme shown is described in detail.
[0102] (1) Noise Power Estimation (NPE)
[0103] First, at the current UE location n, for each OOFDM received symbol For M sampling point signals on subcarriers, calculate the arithmetic mean of the square of its modulus, as a preliminary noise power estimate, which is recorded as:
[0104]
[0105] then, yes After smoothing, the final noise power estimate of the current position n ca...
Embodiment 3
[0136] More specifically, on the basis of Embodiment 1 and Embodiment 2, in order to more fully illustrate the beneficial effects of the present invention, the following combines the simulation analysis and results of a specific embodiment to further improve the effectiveness and advancement of the present invention. be explained.
[0137] First, suppose the simulation scenario is as image 3 As shown, taking the position of the LED as the origin of the Cartesian coordinate system, the UVLC terminal moves at a speed of 2m / s on a plane perpendicular to the z-axis, and moves from position (-1, 0.5, 10) to position (1, 0.5, 10). The specific simulation parameters are given in Table 1.
[0138] Table 1: Simulation parameter table
[0139]
[0140] Secondly, the relevant parameters of the AOSMF-CE scheme mainly include: filter order Q=5, forgetting factor β R =0.999 and β C =0.9, the maximum number of iterations I max =3. Figure 4 The performance curves of mean square er...
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