CN-122027089-A - Marine mobile channel adaptive code modulation transmission method and system thereof

CN122027089ACN 122027089 ACN122027089 ACN 122027089ACN-122027089-A

Abstract

The invention discloses a self-adaptive code modulation transmission method and a system thereof for an offshore mobile channel, which relate to the technical field of wireless communication and comprise the steps of acquiring dynamic sensing data, spatial position and channel state information history sequences of a mobile platform; the method comprises the steps of reconstructing an absolute motion speed vector of an antenna under a reference navigation coordinate system based on an antenna installation position bias characteristic, extracting an effective radial speed scalar by combining a line-of-sight direction vector, determining a dynamic channel coherent time boundary according to the absolute motion speed vector, performing truncation processing on a channel sequence to obtain a target predicted input sequence, generating a reference signal-to-noise ratio predicted value by utilizing a time sequence predicted model, determining a nonlinear rollback compensation amount based on angular acceleration obtained by rotation angular velocity difference, further correcting the reference predicted value to obtain the target signal-to-noise ratio and performing physical layer resource mapping.

Inventors

SHEN RUIHAN
YANG ZHICHENG
LUO SIYUAN

Assignees

西北工业大学

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. An offshore mobile channel adaptive coded modulation transmission method, applied to a communication device provided on a mobile platform, the mobile platform being configured with an antenna, the method comprising: acquiring dynamic sensing data and first space position data of the mobile platform, second space position data of a target communication opposite end and a channel state information history sequence between the antenna and the target communication opposite end, wherein the dynamic sensing data at least comprises a transient rotation angular velocity sequence, a translation velocity and a transient posture characteristic; Reconstructing an absolute motion velocity vector of the antenna under a reference navigation coordinate system based on the dynamic sensing data and a preset antenna installation position bias characteristic; Determining a line-of-sight direction vector of the antenna pointing to the target communication opposite end based on the first spatial position data and the second spatial position data; Performing spatial projection processing on the absolute motion velocity vector to the line-of-sight direction vector, and extracting an effective radial velocity scalar; determining a dynamic channel coherent time boundary according to the effective radial velocity scalar, and executing truncation processing on the channel state information history sequence based on the dynamic channel coherent time boundary to obtain a target prediction input sequence; Inputting the target prediction input sequence into a preset time sequence prediction model for processing to generate a reference signal-to-noise ratio predicted value; determining a nonlinear back-off compensation amount for the reference signal-to-noise ratio predicted value based on a transient angular acceleration scalar obtained by carrying out differential processing on the transient rotational angular velocity sequence; And correcting the reference signal-to-noise ratio predicted value by utilizing the nonlinear back-off compensation quantity to obtain a target signal-to-noise ratio, and executing modulation coding strategy mapping of physical layer resources based on the target signal-to-noise ratio.
2. The method for adaptive coded modulation transmission of an offshore mobile channel according to claim 1, wherein said calculating of said absolute motion velocity vector comprises: performing vector cross multiplication operation based on the transient rotation angular velocity sequence and the antenna installation position bias characteristic to obtain a tangential linear velocity vector of the antenna under a carrier coordinate system; constructing a transient attitude rotation matrix converted from the carrier coordinate system to the reference navigation coordinate system based on the transient attitude features; performing coordinate system mapping processing on the tangential linear velocity vector by utilizing the transient attitude rotation matrix to obtain a projection linear velocity vector; And carrying out vector superposition processing on the projection linear velocity vector and the translation velocity to obtain the absolute motion velocity vector.
3. The method for adaptive coded modulation transmission of an offshore mobile channel according to claim 1, wherein said determining of said line-of-sight direction vector comprises: Converting the first space position data and the second space position data into a geocentric geodetic coordinate system, and calculating to obtain an absolute space distance vector under the geodetic coordinate system; Constructing a local tangential plane coordinate conversion matrix based on the first space position data, and converting the absolute space distance vector into a local navigation coordinate system by utilizing the local tangential plane coordinate conversion matrix to obtain a local distance vector; And performing modular length normalization processing on the local distance vector to obtain the sight distance direction vector.
4. The method for adaptive code modulation transmission over an offshore mobile channel of claim 1 wherein performing spatial projection processing on the absolute motion velocity vector toward the line-of-sight direction vector to extract an effective radial velocity scalar comprises: performing space vector inner product operation on the absolute motion velocity vector and the line-of-sight direction vector, and determining an absolute value of an inner product operation result as the effective radial velocity scalar; Generating a false positive exemption instruction when the calculated two-norm analog length of the transient rotation angular velocity sequence is larger than a first preset threshold value and the effective radial velocity scalar is smaller than or equal to a second preset threshold value; And stopping executing the truncation processing of the channel state information historical sequence and the correction processing of the reference signal to noise ratio predicted value based on the false positive exemption instruction, directly determining the channel state information historical sequence as the target predicted input sequence, and directly determining the reference signal to noise ratio predicted value as the target signal to noise ratio.
5. The method for adaptive code modulation transmission over an offshore mobile channel of claim 1 wherein determining a dynamic channel coherence time boundary based on the effective radial velocity scalar and performing truncation processing on the historical sequence of channel state information based on the dynamic channel coherence time boundary to obtain a target predicted input sequence comprises: calculating transient physical coherence time based on a preset communication carrier wavelength and the effective radial velocity scalar; Performing downward rounding processing on the quotient of the transient physical coherence time and a preset transmission time interval to obtain the quantity of coherence time slots; Comparing a preset maximum historical prediction window length with the number of the coherent time slots, and determining the minimum value of the preset maximum historical prediction window length and the number of the coherent time slots as the coherent time boundary of the dynamic channel; According to the time length represented by the dynamic channel coherence time boundary, reserving and discarding the time-aligned channel state information history sequence to obtain the target prediction input sequence; The dynamic channel coherence time boundary satisfies the following mathematical expression: ; Wherein, the Representing the number of slots corresponding to the dynamic channel coherence time boundary, Indicating a preset maximum historical prediction window length, Representing the wavelength of the communication carrier wave, Representing the effective radial velocity scalar quantity, Represents a control zero constant value, Representing a transmission time interval.
6. The method for adaptive code modulation transmission of an offshore mobile channel according to claim 1, wherein the calculating of the target signal-to-noise ratio comprises: Calculating the quotient of the transient angular acceleration scalar and a preset acceleration reference constant to obtain a target exponent; Taking a natural constant as a base number and the target exponent power as an exponent, and calculating to obtain a base line defense factor; calculating the product of the bottom line defense factor and a preset punishment gain coefficient to obtain the nonlinear back-off compensation quantity; And performing difference operation on the reference signal-to-noise ratio predicted value and the nonlinear back-off compensation quantity to obtain the target signal-to-noise ratio.
7. The method for adaptive code modulation transmission over an offshore mobile channel of claim 6 wherein the target signal-to-noise ratio satisfies the following mathematical expression: ; Wherein, the Representing the signal-to-noise ratio of the target, Representing the reference signal-to-noise ratio prediction value, Representing the penalty gain factor(s), A transient angular acceleration scalar is represented, Indicating the acceleration reference constant.
8. The method for adaptive code modulation transmission of an offshore mobile channel of claim 1, wherein performing a modulation coding strategy mapping of physical layer resources based on the target signal-to-noise ratio comprises: acquiring the effective radial velocity scalar in a continuous sampling period, and executing first-order time derivative calculation on the continuous effective radial velocity scalar to obtain a radial velocity change rate characteristic; When the radial speed change rate characteristic is positive, a preset first modulation and coding strategy mapping matrix is called, and a first state switching protection interval is configured in the first modulation and coding strategy mapping matrix; when the radial speed change rate characteristic is negative, a preset second modulation and coding strategy mapping matrix is called, wherein the second modulation and coding strategy mapping matrix is configured with a second state switching protection interval, and the first state switching protection interval is larger than the second state switching protection interval; And in the invoked first modulation coding strategy mapping matrix or the second modulation coding strategy mapping matrix, carrying out matching inquiry according to the target signal-to-noise ratio, and outputting a target modulation coding strategy instruction.
9. The method for adaptive code modulation transmission of an offshore mobile channel according to claim 8, wherein the step of performing a matching query based on the target signal-to-noise ratio to output a target modulation and coding strategy command comprises: acquiring a plurality of discrete modulation orders contained in a called mapping matrix and a signal-to-noise ratio judgment threshold bound with each modulation order; The signal-to-noise ratio judgment threshold of the first modulation and coding strategy mapping matrix, which is retracted to the low-order modulation, is higher than the signal-to-noise ratio judgment threshold of the second modulation and coding strategy mapping matrix, which is retracted to the low-order modulation; performing numerical comparison on the target signal-to-noise ratio and a signal-to-noise ratio judgment threshold in the called mapping matrix respectively; and screening out a modulation coding strategy corresponding to the highest order which can be met by the target signal-to-noise ratio, and taking the modulation coding strategy as a target modulation coding strategy instruction.
10. An offshore mobile channel adaptive code modulation transmission system, wherein the offshore mobile channel adaptive code modulation transmission method according to any one of claims 1 to 9 is used, comprising: The system comprises a data acquisition module, a target communication opposite end, a dynamic sensing module and a communication module, wherein the data acquisition module is used for acquiring dynamic sensing data and first space position data of the mobile platform, second space position data of the target communication opposite end and a channel state information history sequence between an antenna and the target communication opposite end; the motion speed reconstruction module is used for reconstructing an absolute motion speed vector of the antenna under a reference navigation coordinate system based on the dynamic sensing data and a preset antenna installation position bias characteristic; the sight distance direction determining module is used for determining a sight distance direction vector of the antenna pointing to the target communication opposite end based on the first space position data and the second space position data; the radial velocity extraction module is used for performing space projection processing on the absolute motion velocity vector to the sight distance direction vector and extracting an effective radial velocity scalar; The channel truncation module is used for determining a dynamic channel coherent time boundary according to the effective radial velocity scalar and executing truncation processing on the channel state information history sequence based on the dynamic channel coherent time boundary to obtain a target prediction input sequence; the signal-to-noise ratio prediction module is used for inputting the target prediction input sequence into a preset time sequence prediction model for processing and generating a reference signal-to-noise ratio prediction value; The compensation quantity determining module is used for carrying out differential processing on the transient rotation angular velocity sequence to obtain a transient angular acceleration scalar, and determining a nonlinear rollback compensation quantity aiming at the reference signal-to-noise ratio predicted value based on the transient angular acceleration scalar; and the correction and mapping module is used for correcting the reference signal-to-noise ratio predicted value by utilizing the nonlinear back-off compensation quantity to obtain a target signal-to-noise ratio, and executing modulation coding strategy mapping of physical layer resources based on the target signal-to-noise ratio.

Description

Marine mobile channel adaptive code modulation transmission method and system thereof Technical Field The invention relates to the technical field of wireless communication, in particular to a self-adaptive code modulation transmission method and a system thereof for an offshore mobile channel. Background In an offshore wireless communication scene, in order to cope with the continuously-changing electromagnetic wave propagation environment, a communication system generally adopts an adaptive modulation and coding technology, and the technology aims to dynamically select the best matched modulation order and coding rate according to the current channel quality, so that the effective throughput of data transmission is maximized on the premise of ensuring that the bit error rate meets the requirement. The conventional communication terminal generally collects historical channel feedback data and sends the data into a time sequence prediction algorithm to deduce the trend of signal to noise ratio at the next moment, however, in real complex sea conditions, the ship is not only displaced forwards but also subjected to continuous impact of surge to generate severe rolling and pitching when in navigation, the abrupt change of the spatial attitude can be amplified through the lever effect of a mast to cause the communication antenna at a high position to generate extremely large spatial tangential motion, and the real electromagnetic wave coherence time is extremely compressed instantaneously due to the fact that the conventional severe swing is exceeded, and a stable prediction window preset based on translational navigation speed is immediately disabled. If the system still blindly extracts the lagged and distorted data to fit, blind optimistic estimation which is seriously deviated from reality is inevitably output, the system is caused to erroneously distribute a modulation mode with extremely high order, and finally large-area channel congestion and large-rule decoding collapsibility in conventional navigation are caused. Therefore, how to avoid the systematic prediction failure caused by the severe abrupt change of the spatial attitude of the mobile carrier becomes a core technical bottleneck to be solved in the field. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides an offshore mobile channel self-adaptive code modulation transmission method and a system thereof. In order to achieve the above object, the technical scheme of the present invention is as follows: In a first aspect, the invention discloses a method for transmitting adaptive code modulation of a marine mobile channel, which comprises the following steps: Acquiring dynamic sensing data and first space position data of a mobile platform, second space position data of a target communication opposite end and a channel state information history sequence between an antenna and the target communication opposite end, wherein the dynamic sensing data at least comprises a transient rotation angular velocity sequence, a translation velocity and a transient attitude characteristic; Reconstructing an absolute motion velocity vector of the antenna under a reference navigation coordinate system based on the dynamic sensing data and a preset antenna installation position bias characteristic; Determining a line-of-sight direction vector of the antenna pointing to the target communication opposite end based on the first spatial position data and the second spatial position data; performing space projection processing on the absolute motion velocity vector to the line-of-sight direction vector, and extracting an effective radial velocity scalar; Determining a dynamic channel coherent time boundary according to the effective radial velocity scalar, and executing truncation processing on the channel state information history sequence based on the dynamic channel coherent time boundary to obtain a target prediction input sequence; Inputting a target prediction input sequence into a preset time sequence prediction model for processing to generate a reference signal-to-noise ratio predicted value; Determining a nonlinear back-off compensation amount for a reference signal-to-noise ratio predicted value based on a transient angular acceleration scalar obtained by carrying out differential processing on a transient rotational angular velocity sequence; and correcting the reference signal-to-noise ratio predicted value by using the nonlinear back-off compensation quantity to obtain a target signal-to-noise ratio, and executing modulation coding strategy mapping of the physical layer resource based on the target signal-to-noise ratio. In a second aspect, the present invention discloses an offshore mobile channel adaptive code modulation transmission system comprising: The system comprises a data acquisition module, a target communication opposite end, a dynamic sensing module and a communication module, wherein the data acquis