Power compensation mmse equalization method for wireless multipath channel
An equalization method and power compensation technology, applied in channel estimation, shaping network in transmitter/receiver, digital transmission system, etc., can solve problems such as channel time fading, frequency selective fading, system performance degradation, etc., and achieve easy Engineering implementation, low complexity, good performance
Active Publication Date: 2019-08-02
西安烽火电子科技有限责任公司
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[0003] However, the symbol crosstalk caused by the frequency selective fading caused by multipath in the wireless channel seriously affects the reliability of broadband wireless communication.
Broadband high-speed data transmission is very sensitive to the time variation of the channel, and the increase of the bandwidth will make the sampling interval smaller than the delay spread of the channel, which results in frequency selective fading in the multipath environment
At the same time, the high-speed relative movement between wireless communication devices will cause the Doppler frequency shift effect, and the Doppler effect makes the transmission channel change rapidly with time, thus causing time-selective fading of the channel
Therefore, the wireless broadband mobile communication system will suffer from intersymbol interference due to the influence of channel time-frequency dual selective fading. Intersymbol interference will deteriorate the received signal, increase the bit error rate, and reduce system performance. unable to continue working
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[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0034] The adaptive equalizer based on the pilot training sequence generally includes two working modes, namely training mode and tracking mode. In the training mode, the traditional method is that the transmitting end transmits a known, fixed-length pilot training sequence, so that the equalizer at the receiving end can calculate the channel estimation value through the distorted received signal and the known transmitted signal, according to the channel estima...
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The invention belongs to the wireless communication technology field and discloses a power compensation MMSE equalization method for a wireless multipath channel. The method comprises steps that A / D sampling for data after wireless multipath channel transmission is carried out to acquire the sampling data after reception; MMSE estimation for the wireless multipath channel is carried out to acquire a frequency domain filter coefficient of the wireless multipath channel, and a filter error power spectrum and a compensation direction of MMSE estimation are determined; the frequency domain filter coefficient of the wireless multipath channel is corrected to acquire a frequency domain filter coefficient after error compensation; frequency domain equalization for frequency domain sampling data is carried out according to the frequency domain filter coefficient after error compensation to acquire the data after frequency domain equalization; the actual reception data is acquired. The method is advantaged in that better performance and lower complexity are realized, and the method is easy for engineering realization.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a power compensation MMSE (Minimum Mean Squared Error, minimum mean square error) equalization method of a wireless multipath channel. Background technique [0002] Due to the limitation of communication capabilities, traditional combat methods can only rely on the situational awareness, command and control capabilities, maneuverability, lethality, survivability and quantity of each combat unit to form its combat effectiveness, while network-centric warfare uses advanced Communication and network technology mainly rely on the cooperation and coordination among combat units to generate combat effectiveness. The battlefield situation is changing rapidly and the amount of communication data is huge. Therefore, combat troops have higher requirements for traditional military communication stations in terms of transmission rate, channel bandwidth, communicati...
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IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/0204H04L25/0256H04L25/03006H04L25/03159H04L2025/03522
Inventor 王西玲马允龙杨勇梁峰朱广法张青松李钧
Owner 西安烽火电子科技有限责任公司