Narrow-band short-wave channel equalization algorithm under variable channel coefficient

A short-wave channel, time-varying channel technology, applied in baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as inter-symbol interference

Inactive Publication Date: 2012-01-18
NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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Problems solved by technology

Because the ionosphere changes with time, location, season, climate, etc., the shortwave channel presents time-varying dispersion characteristics; the existence of multipath effects also leads to serious intersymbol interference

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  • Narrow-band short-wave channel equalization algorithm under variable channel coefficient
  • Narrow-band short-wave channel equalization algorithm under variable channel coefficient
  • Narrow-band short-wave channel equalization algorithm under variable channel coefficient

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Embodiment Construction

[0123] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0124] Such as figure 1 As shown, a narrowband short-wave channel equalization algorithm under time-varying channel coefficients uses time-varying channel coefficients to eliminate training sequences and introduces intersymbol interference DDEA equalization algorithm (Variable Channel Coefficients-DDEA, VCC-DDEA) to improve short-wave data communication performance. The specific steps are:

[0125]Step 1. HF channel modeling and initial HF channel estimation

[0126] Step 1.1, HF channel modeling

[0127] The data frame structure of the narrowband shortwave single-tone serial data communication follows the US military standard MIL-STD-110B, the signal modulation method is 8PSK, and the symbol rate is 2400Baud. The receiver uses the transmitter to send training sequences to complete the shortwave channel equalization. The data strea...

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Abstract

The invention relates to the technical field of short-wave data communication and specifically discloses a narrow-band short-wave channel equalization algorithm under a variable channel coefficient. The algorithm comprises the following specific steps: step 1) modeling a short-wave channel and performing initial estimation on the short-wave channel; step 2) utilizing a DDEA (data directed equalization algorithm) channel equalization algorithm to estimate the best estimation value of a user data sequence, and solving the user data sequence; step 3) performing short-wave channel tracking and solving the channel coefficient at any sampling time; step 4) utilizing a VCC-DDEA (variable channel coefficient-data directed equalization algorithm) to eliminate inter-symbol interference introduced in a training sequence and solving the best estimation value of the user data sequence under a time-varying channel; and step 5) amending user data which is estimated by the DDEA algorithm, further tracking the channel and amending a short-wave channel tracking value. The DDEA equalization algorithm using the variable channel coefficient to eliminate the inter-symbol interference introduced in the training sequence is adopted in the algorithm provided by the invention, thereby effectively improving the performance of narrow-band short-wave single-tone serial data communication and improving the signal-noise ratio by more than 5dB under the conditions of the same communication data rate and the same error rate.

Description

technical field [0001] The invention belongs to the technical field of short-wave data communication, and in particular relates to a narrow-band short-wave channel equalization algorithm under time-varying channel coefficients. Background technique [0002] The short wave mainly realizes beyond-the-line-of-sight communication by reflecting electromagnetic signals through the ionosphere. Because the ionosphere changes with time, place, season, climate, etc., the short-wave channel presents time-varying dispersion characteristics; the existence of multipath effects also leads to serious intersymbol interference. HF channel equalization is one of the effective means to overcome HF intersymbol interference and eliminate channel distortion. At present, the commonly used HF channel equalization algorithm is mainly based on the training sequence and frame data structure to eliminate inter-symbol interference DDEA (Data-Aided Equalization Algorithm) algorithm, which processes the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 周新力田伟金慧琴宋斌斌皮之军吴建刚张剑刘东鑫刘晓娣周旻吴海荣
Owner NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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