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High-order quadrature amplitude modulation signal blind equalization method and device, and blind equalizer

A quadrature amplitude modulation and blind equalization technology, applied in baseband system components, multi-carrier systems, shaping networks in transmitter/receiver, etc. The effect of improving equalization performance, improving sample utilization rate, and improving sample utilization rate

Pending Publication Date: 2022-07-29
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

[0005] Through the above analysis, the problems and defects of the existing technology are: the artificial error and misadjustment easily caused by the classic constant modulus method under the existing high-order quadrature amplitude modulation channel, and the low sample utilization rate

Method used

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  • High-order quadrature amplitude modulation signal blind equalization method and device, and blind equalizer
  • High-order quadrature amplitude modulation signal blind equalization method and device, and blind equalizer
  • High-order quadrature amplitude modulation signal blind equalization method and device, and blind equalizer

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Embodiment 1

[0136] Embodiment 1. Blind equalization of indoor visible light communication

[0137] In the visible light communication based on white light-emitting diodes, since the same signal reaches the receiving end through different paths, inter-symbol crosstalk will be caused due to the multipath effect. characteristics, an equalizer can be used at the receiving end of the system to compensate the transmission characteristics of the channel, thereby improving the reliability of the communication system. The embodiment applies the blind equalization scheme given by the present invention to indoor visible light communication, aiming to reduce indoor visible light The bit error rate of the communication and the intersymbol interference caused by the multipath effect improve the transmission characteristics of the system.

Embodiment 2

[0138] Embodiment 2. Communication confrontation

[0139] The communication countermeasure system refers to a unified and coordinated whole composed of multiple communication countermeasure devices in order to complete a specific communication countermeasure task. There are main listening and receiving equipment in communication confrontation. As the main equipment in modern military communication, its receiving signals have the characteristics of short duration, diverse signals, easy to disappear, and sometimes even only hundreds of symbols of data. For different burst signals sent, the blind demodulation scheme provided by the present invention can be applied to the communication countermeasure listening module, ensuring that the listening signal can eliminate the inter-symbol crosstalk with high performance, compensate the influence of the shortwave channel response on the signal, and improve the equipment performance.

[0140] 3. Evidence of the relevant effects of the em...

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Abstract

The invention belongs to the technical field of channel blind equalization in wireless communication, and discloses a high-order quadrature amplitude modulation signal blind equalization method, equipment and a blind equalizer, the prior probability of a high-order quadrature amplitude modulation signal is obtained based on a plurality of constant modulus values of the high-order quadrature amplitude modulation signal, and the prior probability of the high-order quadrature amplitude modulation signal is obtained according to error sorting of an observation signal and a constant modulus value signal. Selecting sample sets with different module values in combination with the prior probability, and aggregating a plurality of sample sets with different module values to form a final sample; constructing a cost function under a high-order quadrature amplitude modulation channel according to a classical constant modulus algorithm and the selected sample set; and constructing a high-order quadrature amplitude modulation channel method iterative formula according to a Newton method, and optimizing a channel blind equalizer. According to the method, personal errors and misadjustment caused by a classical constant modulus method under a high-order quadrature amplitude modulation channel can be effectively suppressed, the sample utilization rate is improved, and meanwhile, a fast convergence Newton method optimal channel blind equalizer is realized.

Description

technical field [0001] The invention belongs to the technical field of channel blind equalization in wireless communication, and in particular relates to a high-order quadrature amplitude modulation signal (QAM) blind equalization method, device and blind equalizer. Background technique [0002] Currently, signals passing through a channel experience various forms of distortion. A common type of distortion is intersymbol interference (ISI) caused by multipath fading (D. Zheng and J. Zhang, "Protocol design and throughput analysis of frequency-agile multi-channel medium access control," IEEE Trans. Wireless Commun. , vol.5, no.10, pp.2887–2895, 2006.). When the source signal passes through the channel, various frequency components with different amplitude and phase changes will be generated due to the influence of multipath, and ISI will occur at the receiving end at this time. Errors caused by ISI can cause the receiver to distort the received signal, so it is necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/36
CPCH04L25/03885H04L27/36H04L2025/03433H04L2025/03675
Inventor 李进樊琛刘明骞张俊林
Owner XIDIAN UNIV
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