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Algorithm for dynamically switching channel equalization based on real-time signal-to-noise ratio estimation

A technology for signal-to-noise ratio estimation and channel equalization, which is applied to baseband system components, shaping networks in transmitters/receivers, etc., and can solve problems such as performance crossover

Inactive Publication Date: 2011-06-29
NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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Problems solved by technology

The modem designed based on the US military standard MIL-STD-188-110B fixed-frequency communication mode is narrow-band short-wave data communication. exhibit different bit error rate performance, and there is an obvious performance crossover

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  • Algorithm for dynamically switching channel equalization based on real-time signal-to-noise ratio estimation
  • Algorithm for dynamically switching channel equalization based on real-time signal-to-noise ratio estimation
  • Algorithm for dynamically switching channel equalization based on real-time signal-to-noise ratio estimation

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Embodiment Construction

[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Such as figure 2 As shown, a dynamic switching channel equalization algorithm based on real-time signal-to-noise ratio estimation is based on the US military standard MIL-STD-188-110B fixed-frequency transmission mode based on narrow-band short-wave data communication, and uses different short-wave channel signal-to-noise ratio parameters , to dynamically switch between direct DDEA and decision feedback DDEA channel equalization methods, the specific steps are:

[0056] Step 1. On the premise that the channel order is known, the estimation of the initial state of the channel in the shortwave channel equalization is completed.

[0057] The narrowband shortwave channel baseband model follows the US military standard MIL-STD-110B fixed frequency transmission mode, the signal modulation method is 8PSK, the symbol rate is 2400Baud...

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Abstract

The invention relates to the technical field of short-wave communication, and in particular discloses an algorithm for dynamically switching channel equalization based on real-time signal-to-noise estimation. The method comprises the following steps of: 1) estimating channel initial state in the short-wave channel equalization under the condition that channel order is known; 2) based on minimum error sum squares and a Shur algorithm, estimating data information by adopting a direct-type channel equalization algorithm; 3) according to result of channel equalization, estimating the signal-to-noise ratio of code symbols of the current frame in real time; 4) according to the signal-to-noise result estimated in real time, comparing with a preset threshold, and equalizing received data by selecting a direct-type or decision feedback-type channel equalization algorithm; and 5) carrying out subsequent decision, interlacing and decoding on the equalized data, and restoring data sending. The method provided by the invention produces no influence on a hardware platform of a modulator-demodulator, and the signal-to-noise ratio can be improved by 1-2dB 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 shortwave data communication, and in particular relates to a dynamic switching channel equalization algorithm based on real-time signal-to-noise ratio estimation. Background technique [0002] Shortwave is within the range of about 100 kilometers to thousands of kilometers, and can realize beyond-the-line-of-sight communication without relays. For a long time, short-wave communication has been one of the important means of communication due to its low cost and strong resistance to destruction, especially in military communication. However, the shortwave channel is a time-varying fading channel, and data communication is affected by factors such as time and space, and there are phenomena such as unstable communication and low data rate. The short-wave modem is the key equipment for short-wave data communication, which is used to realize audio modulation and demodulation of digital signals. By implementing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
Inventor 周新力田伟吴海荣周旻金慧琴宋斌斌吴龙刚孟庆萍肖金光
Owner NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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