Method and device for determining signal-to-noise ratio, channel equalization method and device
A determination method and technology for signal-to-noise ratio, which are applied in the separation device of transmission path, sub-channel allocation of transmission path, error detection/prevention using signal quality detector, etc., can solve problems such as large computational complexity
Active Publication Date: 2019-09-24
NAT UNIV OF DEFENSE TECH
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Its basic idea is to use two leading symbols to estimate the noise power, but the computational complexity of this method is relatively large, and it directly estimates the noise power, and the signal-to-noise ratio needs to be further estimated to achieve
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[0066] 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 creative efforts fall within the protection scope of the present invention.
[0067] The embodiment of the present invention discloses a signal-to-noise ratio determination method and device at the receiving end of an information transmission system, and a channel equalization method and device based on an MMSE equalizer, so as to reduce the calculation amount of the signal-to-noise ratio and realize a stable and reliable signal-to-noise ratio estimate.
[0068] It can be understood that, assuming that the transmitted signal is s(k), its ave...
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The invention discloses a method and device for determining the signal-to-noise ratio at the receiving end of an information transmission system. Based on an information transmission system that uses a repeated training sequence structure to realize time-frequency synchronization, the signal and noise are independent of each other, without adding additional computational complexity. Under the condition of , the stable and reliable estimation of the signal-to-noise ratio is realized through the peak value and valley value of the autocorrelation function, which reduces the calculation amount of the signal-to-noise ratio. Further, the present invention also discloses a channel equalization method and device based on an MMSE equalizer, which obtains a stable and reliable signal-to-noise ratio through the above-mentioned signal-to-noise ratio determination method to determine the MMSE equalizer coefficients, and then uses the average value of the channel frequency domain response 1. The average power of the signal and noise determines the scale correction factor, so that while retaining the good equalization performance of the MMSE equalizer, the constellation diagram of the output signal can be scale-stabilized through scale correction, which is convenient for the normal operation of the subsequent soft solution module.
Description
technical field [0001] The technical field of the mobile communication system of the present invention, more specifically, relates to a method and device for determining a signal-to-noise ratio at a receiving end of an information transmission system, and a method and device for channel equalization based on an MMSE equalizer. Background technique [0002] In the high-speed information transmission system, the basic transmission technology can be divided into multi-carrier transmission technology and single-carrier transmission technology. The most representative multi-carrier transmission technology is OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing technology), and the single-carrier transmission technology is SCFDE (Single carrier frequency domain equalization, single carrier frequency domain equalization system). Taking the SCFDE system as an example, see figure 1 , is a schematic diagram of the transmission process of the SC...
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IPC IPC(8): H04L25/03H04L27/00H04B17/336
CPCH04B17/336H04L25/03159H04L27/0014H04L2027/0026H04L1/20H04L27/2675H04L27/2663H04B1/71055H04L1/0002H04L5/0005H04L5/006G06F18/214
Inventor 魏急波辜方林黄圣春熊俊唐麒
Owner NAT UNIV OF DEFENSE TECH