CN107294888B - Equalization enhancement module, demodulation system and equalization enhancement method - Google Patents

Abstract

The present invention relates to an equalization enhancement module, comprising a multiplication unit, for multiplying a plurality of equalization signals by a scaling coefficient to obtain a plurality of scaling signals; a determination unit, coupled to the multiplication unit, for determining whether the plurality of scaling signals are located in a specific area, and generating a plurality of determination results; a ratio calculation unit, coupled to the determination unit, for calculating an intra-area ratio according to the plurality of determination results, wherein the intra-area ratio is related to a ratio of the plurality of scaling signals located in the specific area; and a coefficient calculation unit, coupled to the ratio calculation unit, for calculating the scaling coefficient according to the intra-area ratio.

Description

Equalization enhancement module, demodulation system and equalization enhancement method

technical field

The present invention relates to an equalization enhancement module, a demodulation system and an equalization enhancement method, in particular to an equalization enhancement module, a demodulation system and an equalization enhancement method which can improve the minimum mean square error equalizer.

Background technique

Digital communication systems have been widely used in digital communication devices such as mobile phones, digital video converter boxes (Set-Top Box, STB), digital TV sticks, and wireless network cards. Generally speaking, a digital communication system includes a modulation (Modulation) system and a demodulation (Demodulation) system. The modulation system modulates the bits to be transmitted into transmitted symbols and transmits them to the channel, and then the demodulation system receives the received signal to Perform demodulation; a received signal y received by the demodulation system can be expressed as y=hs+n, where s represents the transmitted symbol generated by the modulation system, h represents the channel response, and n represents the noise. After the demodulation system receives the channel received signal, an equalizer included in the demodulation system is used to eliminate the influence of the channel on the transmitted symbols.

其中

及

分别代表传送符元及噪声的能量，而最小均方差均衡器的输出信号x_MMSE可表示为

如此一来，无论通道响应或强或弱，当接收信噪比(Received Signal-to-Noise Ratio，Received SNR)够高，即接收信号能量

远大于噪声能量

时，

可近似于h^-1，最小均方差均衡器可近似于强制归零均衡器。In the known technology, a zero-forcing equalizer (Zero Forcing Equalizer) is a low-complexity equalizer, which multiplies the received signal y by the inverse of the channel response (denoted as h ^-1 ), and the output of the forcing-to-zero equalizer is The signal x _ZF can be expressed as x _ZF =h ^-1 y = s+h ^-1 n, so that the forced-to-zero equalizer can eliminate the effect of the channel on the transmitted symbols. However, when the channel response is small, the forced-zero equalizer has the problem of noise enhancement. In order to avoid the effect of noise enhancement caused by the forced-to-zero equalizer, Minimum Mean Square Error Equalizer (MMSE Equalizer) has become a common solution in demodulation systems. The minimum mean square error equalizer multiplies the received signal y by by

in

and

represent the energy of transmitted symbols and noise, respectively, and the output signal x _MMSE of the minimum mean square error equalizer can be expressed as

In this way, no matter whether the channel response is strong or weak, when the received signal-to-noise ratio (Received Signal-to-Noise Ratio, Received SNR) is high enough, the received signal energy is

much larger than the noise energy

hour,

can be approximated by h ^-1 , the minimum mean square error equalizer can be approximated by a forced-zero equalizer.

较强时，最小均方差均衡器会造成其输出信号x_MMSE的能量减小，反而降低解调制系统的符元判断精准度，即最小均方差均衡器的输出信号x_MMSE的能量减小会导致解调制系统的符元错误率(Symbol Error Rate，SER)及相应的位错误率(BitError Rate，BER)上升，反而降低解调制系统的系统效能。However, when the noise energy

When it is strong, the minimum mean square error equalizer will cause the energy of its output signal x _MMSE to decrease, but it will reduce the symbol judgment accuracy of the demodulation system, that is, the reduction of the energy of the output signal x _MMSE of the minimum mean square error equalizer will lead to The symbol error rate (SER) of the demodulation system and the corresponding bit error rate (BitError Rate, BER) of the demodulation system increase, which reduces the system performance of the demodulation system.

Therefore, there is a need for improvement in the known technology.

SUMMARY OF THE INVENTION

Therefore, the main purpose of the present invention is to provide an equalization enhancement module, a demodulation system and an equalization enhancement method, so as to improve the shortcomings of the known technology.

The present invention discloses an equalization enhancement module, comprising a multiplication unit for multiplying a plurality of equalized signals by a scaling coefficient to obtain a plurality of scaled signals; a judgment a unit, coupled to the multiplication unit, used for judging whether the plurality of scaling signals are located in a specific area, and generating a plurality of judgment results; a ratio calculation unit, coupled to the judgment unit, used for according to the plurality of judgment results, calculating an intra-scale ratio, wherein the intra-scale ratio is related to a ratio at which the plurality of zoom signals are located in the specific area; and a coefficient calculation unit coupled to the scale calculation unit for calculating the intra-scale ratio according to the intra-scale ratio zoom factor.

The present invention further discloses a demodulation system, comprising an equalization module for equalizing a plurality of received signals to generate a plurality of equalized signals; a symbol judging module; and an equalization enhancement a module, coupled between the UL modules and the symbol judgment module, the UL enhancement modules include a multiplication unit for multiplying the plurality of equalization signals by a scaling factor to obtain a plurality of scaling signals; a judgment a unit, coupled to the multiplication unit, used for judging whether the plurality of scaling signals are located in a specific area, and generating a plurality of judgment results; a ratio calculation unit, coupled to the judgment unit, used for according to the plurality of judgment results, calculating a scale within an area; and a coefficient calculating unit coupled to the scale calculating unit for calculating the scaling coefficient according to the scale within the area; wherein the symbol determination module demodulates the plurality of scaled signals.

The present invention further discloses an equalization enhancement method, which includes multiplying a plurality of equalization signals by a scaling factor to obtain a plurality of scaled signals; judging whether the plurality of scaled signals are located in a specific area, and generating a plurality of judgment results; The plurality of determination results are used to calculate an in-area ratio, wherein the in-area ratio is related to a ratio of the plurality of zoom signals in the specific area; and the zoom coefficient is calculated according to the in-area ratio.

Description of drawings

FIG. 1 is a schematic diagram of a demodulation system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an equalization enhancement module according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a proportional calculation unit according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a coefficient calculation unit according to an embodiment of the present invention.

FIG. 5 is a constellation diagram of a plurality of equalized signals.

FIG. 6 is a constellation diagram of a plurality of scaled signals.

FIG. 7 is a schematic diagram of one frame.

FIG. 8 is a schematic diagram of a demodulation system according to Embodiment 1 of the present invention.

FIG. 9 is a schematic diagram of an equalization enhancement module according to an embodiment of the present invention.

Symbol Description

1 Demodulation system

10 Equalization Enhancement Module

12 Equalization Modules

14 Symbolic judgment module

200 Multiplication Units

202 Judgment unit

204, 304 proportional calculation unit

206, 406 Coefficient calculation unit

300 average units

80 Equalization Enhancement Process

800～810 steps

90 Equalization Enhancement Module

902 processing unit

904 storage unit

908 program code

y ₁ to _yn received signal

x ₁ ~ x _n equalized signal

gx ₁ to gx _n scaled signal

AD1, AD2 adder

D1, D2 registers

Data data subframe

FR frame

Header subframe

MUX multitasker

MP1, MP2 Multiplier

Proportion within I _k , I _k+1

IR specific ratio

R ₀ specific area

SB subtractor

g _k , g _k+1 scaling factor

hit _k judgment result

α Average coefficient

μ adjustment factor

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of a demodulation system 1 according to an embodiment of the present invention. The demodulation system 1 can be an Application-Specific Integrated Circuit (ASIC), which includes an equalization module 12 , an equalization enhancement module 10 and a symbol determination module 14 . The demodulation system 1 receives multiple received signals from a channel, the equalization module 12 is used to equalize the multiple received signals to generate multiple equalized signals (Equalized Signals), and the equalization enhancement module 10 equals the multiple received signals. The equalized signal is multiplied by a scaling coefficient to generate a plurality of scaled signals to the symbol determination module 14, and the symbol determination module 14 can demodulate the plurality of scaled symbols. . The equalization module 12 may be a minimum mean square error equalizer (Minimum Mean Square Error Equalizer, MMSE Equalizer). Specifically, in a first time interval to an nth time interval, the demodulation system 1 receives the received signals y _{1 ˜yn by the equalization module 12 respectively, and the equalization module 12 receives the received signals y 1 ˜yn .} After _yn , the received signals y ₁ to _yn are respectively equalized to generate equalized signals x ₁ to x _n . The equalization enhancement module 10 can generate scaling coefficients g ₁ to g _n according to the equalization signals x ₁ to x _n-1 (ie, the output signals from the equalization module 12 received by the equalization enhancement module 10 before the nth time interval). , and multiply the equalized signals x ₁ ˜x _n by the scaling coefficients g ₁ ˜g _n respectively, so as to generate the scaling signals gx ₁ ˜gx _n . The symbol determination module 14 can demodulate the scaled signals gx ₁ -gx _n .

Specifically, in the first time interval, the equalization enhancement module 10 may preset the scaling coefficient g ₁ to 1, and the scaling signal gx ₁ is the equalized signal x ₁ itself (ie, gx ₁ =x ₁ ). During the second time interval, the equalization enhancement module 10 may generate a scaling factor g ₂ according to the equalized signal x ₁ , and multiply the equalized signal x ₂ by the scaling factor g ₂ to generate the scaling signal gx ₂ as gx ₂ =g ₂ x ₂ . By analogy, in the nth time interval, the equalization enhancement module 10 can generate the scaling factor g _n according to the equalized signals x ₁ ˜x _n−1 , and multiply the equalized signal x _n by the scaling factor g _n to generate the scaling The signal gx _n is gx _n =g _n x _n .

It should be noted that since the equalization module 12 is a minimum mean square error equalizer, when the noise energy is strong, the energy of the output signal (ie the equalized signal x ₁ ˜x _n ) is higher than that of the corresponding received signal y _{1 ˜yn} . is small (ie |x _k | ² <|y _k | ² ). In order to avoid the increase of the symbol error rate or the bit error rate corresponding to the demodulation system 1 due to the small energy of the equalization signals x ₁ ˜x _n , the scaling coefficients g ₁ ˜g _n generated by the equalization enhancement module 10 are It is used to compensate the energy reduction caused by the equalization module 12 (ie, the minimum mean square error equalizer), so as to further improve the system performance.

For details of the operation of the equalization enhancement module 10 to generate the scaling coefficients g ₂ ˜g _n (the scaling coefficient g ₁ is preset to 1), please refer to FIG. 1 , and FIG. 2 is a schematic diagram of the equalization enhancement module 10 . As shown in FIG. 2 , the equalization enhancement module 10 includes a multiplication unit 200 , a determination unit 202 , a ratio calculation unit 204 and a coefficient calculation unit 206 . In the first time interval to the nth time interval, the equalization enhancement module 10 receives the equalization signals x ₁ ˜x _n from the equalization module 12 respectively, and the multiplying unit 200 respectively multiplies the equalization signals x ₁ ˜x _n by the scaling factor g ₁ ˜g _n to obtain scaled signals gx ₁ ˜gx _n . The judging unit 202 is coupled to the multiplying unit 200 for judging whether the corresponding constellation points of the scaling signals gx ₁ ˜gx _n are located in a specific region R, so as to generate the judging results hit ₁ ˜hit _n . The ratio calculating unit 204 is coupled to the judging unit 202, and is used for calculating the intra-area ratios I _{1 ˜In} according to the judging results hit ₁ ˜hit _n , wherein the intra-area ratios I ₁ ˜In are related to the scaling signals gx _{1 ˜gx n -1} for the proportion that lies in a specific region R. The coefficient calculation unit 206 is coupled to the scale calculation unit 204 and is used for calculating the scaling coefficients g ₁ ˜g _n according to the intra-area scales I _{1 ˜In} , and transmitting the scaling coefficients g ₁ ˜g _n back to the multiplying unit 200 , so that the In the nth time interval, the multiplying unit 200 can multiply the equalization signal x _n by the scaling coefficient g _n to generate the scaling signal gx _n to the symbol determination module 14 , and the symbol determination module 14 can solve the scaling signal gx _n modulation.

In detail, in the _kth time interval, the determination unit 202 determines whether the corresponding constellation point of the zoomed signal gxk is located in the specific region R, and if the zoomed signal _gxk is located in the specific region R, the determination unit 202 outputs the corresponding constellation point of the zoomed signal _gxk . The judgment result hit _k is 1; otherwise, if the scaling signal gx _k is not located in the specific region R, the judgment unit 202 outputs the judgment result hit _k corresponding to the scaling signal gx _k as 0. The manner in which the determination unit 202 determines whether the corresponding constellation point of the _scaling signal _gxk is located in the specific region R is not limited. Whether a quadrature component (Quadrature Component) is within a specific range, if the in-phase component and the quadrature component of the scaling signal gx _k are within a specific range, the judging unit 202 judges that the scaling signal gx _k is located in a specific region R and outputs the judgment result hit _k as 1 On the contrary, the judgment unit 202 judges that the scaling signal gx _k is not located in the specific region R and outputs the judgment result hit _k as 0. For example, when the received signals y _{1 ˜yn} have a symbol signal modulated by Quadrature Phase Shift Keying (QPSK), the determining unit 202 can determine one of the in-phase components of the scaling signal gx _k Whether the absolute value (denoted as |Re{gx _k }|) is less than a specific value d, and determine whether an absolute value (denoted as |Im{gx _k }|) of the quadrature component of the scaling signal gx _k is smaller than the specific value d , when |Re{gx _k }| is less than the specific value d and |Im{gx _k }| is less than the specific value d, the judgment unit 202 judges that the scaling signal gx _k is located in the specific area R and outputs the judgment result hit _k as 1; otherwise, The judgment unit 202 outputs the judgment result hit _k as 0. The judging unit 202 generates the judging results hit ₁ ˜hit _n , and transmits the judging results hit ₁ ˜hit _n to the ratio calculating unit 204 .

The ratio calculation unit 204 can calculate the intra-area ratios I ₁ ˜In by using a recursive averaging method according to the judgment results hit _{1 ˜hit n .} Please refer to FIG. 3 , which is a schematic diagram of a ratio calculation unit 304 according to an embodiment of the present invention. The ratio calculation unit 304 can be used to realize the ratio calculation unit 204, which includes a multiplexer MUX and an averaging unit 300. The multiplexer MUX can be coupled to the judgment unit 202 for receiving the judgment result hit generated by the judgment unit 202 ₁ to hit _n . Taking a judgment result hit _k in the judgment results hit ₁ to hit _n as an example, when the judgment result hit _k is 1, the multiplexer MUX outputs a signal S which is an average coefficient α; when the judgment result hit _k is 0, more The tasker MUX outputs this signal as 0. In other words, the signal S output by the multiplexer MUX can be represented as αhit _k .

On the other hand, the averaging unit 300 can calculate the intra-area ratios I ₁ ˜I _n according to the averaging coefficient α and the judgment results hit ₁ ˜hit _n . Specifically, the averaging unit 300 includes a multiplier MP1 , an adder AD1 and a The register D1, the adder AD1 is coupled to the multiplexer MUX, the register D1 is coupled to the adder AD1, and the multiplier MP1 is coupled between the adder AD1 and the register D1. The following takes the kth time interval and the k+1th time interval as examples for description. In the kth time interval, the output of the register D1 is an intra-area ratio I _k (corresponding to the proportion in the temporary storage area), and the multiplier MP1 Multiply the ratio I _k in the area by a coefficient as (1-α) to generate a multiplication result R1, and transmit the multiplication result R1 to the adder AD1, where the multiplication result R1 can be expressed as R1=(1-α )I _k . The adder AD1 adds the signal S and the multiplication result R1 to obtain an addition result R2. The addition result R2 can be expressed as R2=αhit _k +(1-α)I _k , and the addition result R2 is the ratio I in the area _k+1 . In addition, the ratio calculation unit 304 stores the addition result R2/intra-scale ratio I _k+1 in the register D1, so that in the k+1 th time interval, the register D1 can output the intra-scale ratio I _k+1 , In other words, the averaging unit 300 of the ratio calculating unit 304 is used to realize I _k+1 =αhit _k +(1−α)I _k , where the integer k may be a positive integer from 1 to n−1. In this way, after receiving the determination results hit ₁ to hit _n-1 in the first time interval to the n-1 time interval, the ratio calculation unit 304 can calculate the determination results hit ₁ to hit _n-1 at the first time respectively according to the determination results hit 1 to hit n-1. From the interval to the _nth time zone, the intra-scale ratios I ₁ -In are generated, wherein the intra-scale ratio I ₁ can be preset as a specific value. Meanwhile, in the first time interval to the _nth time interval, the ratio calculation unit 304 transmits the generated intra-area ratios I ₁ -In to the coefficient calculation unit 206 .

The coefficient calculation unit 206 can respectively determine whether the intra-scale ratios I _{1 ˜In} are greater than a specific ratio IR in the first time interval to the n-th time interval, so as to calculate the scaling coefficients g ₂ ˜g _n , so that the intra-scale ratios asymptotically approach to (convergence to) a specific ratio IR. Taking the intra-scale ratio I _k received in the k-th time interval as an example, when the intra-scale ratio I _k is greater than the specific ratio IR, the coefficient calculation unit 206 calculates the scaling coefficient g _k+1 as the scaling coefficient g _k (corresponding to the temporary (i.e., g k+1 =g k +Δg 1 ) is increased by a first specific value Δg ₁ (that is, g _k+1 =g _k +Δg ₁ ); on the contrary, when the intra-area ratio I _k is smaller than the specific ratio IR, the coefficient calculation unit 206 calculates the scaling coefficient g _{k+ 1} is the scaling factor g _k minus a second specific value Δg ₂ (ie g _k+1 =g _k −Δg ₂ ), wherein the first specific value Δg ₁ and the second specific value Δg ₂ are both greater than zero.

Specifically, please refer to FIG. 4 , which is a schematic diagram of a coefficient calculation unit 406 according to an embodiment of the present invention. The coefficient calculation unit 406 can be used to implement the coefficient calculation unit 206, which includes a subtractor SB, a multiplier MP2, an adder AD2, and a register D2. The subtractor SB is coupled to the ratio calculation unit 204 to receive the regional ratio generated by the ratio calculation unit 204, the multiplier MP2 is coupled to the subtractor SB, the adder AD2 is coupled between the multiplier MP2 and the register D2, and The buffer D2 also feeds the output back to the adder AD2. Similarly, the following description takes the k-th time interval and the k+1-th time interval as examples. During the k-th time interval, the subtractor SB receives the intra-scale ratio I _k generated by the ratio calculation unit 204, and the subtractor SB converts the The inner ratio I _k is subtracted from the specific ratio IR to produce a subtraction result R3, which can be expressed as R3=I _k −IR. The multiplier MP2 multiplies the subtraction result R3 (ie I _k -IR) by an adjustment coefficient μ, that is, generates a multiplication result R4 and transmits the multiplication result R4 to the adder AD2, wherein the multiplication result R4 can be expressed as R4 =μ(I _k −I _R ), at this time (that is, in the kth time interval) the output of the register D2 is the scaling coefficient g _k (corresponding to the temporary scaling coefficient), and the adder AD2 will multiply the result R4 with The scaling coefficients g _k are added to generate an addition result R5 , which can be expressed as R5=g _k +μ(I _k −IR), and the addition result R5 is the scaling coefficient g _k+1 . In addition, the coefficient calculation unit 406 stores the addition result R5/scaling coefficient g _k+1 in the register D2, so that in the k+1 th time interval, the register D2 can output the scaling coefficient g _k+1 , in other words In other words, the coefficient calculation unit 406 is used to realize g _k+1 =g _k +μ(I _k −IR), where the integer k may be a positive integer from 1 to n−1. In this way, the coefficient calculation unit 406 receives the intra-scale ratios I ₁ ˜I _n-1 in the first time interval to the n−1 th time interval, and calculates the scaling coefficients g ₂ ˜g _n respectively (wherein the scaling coefficient g ₁ is pre- Set to 1), so that the intra-scale scale converges to a specific scale IR.

In this way, the equalization enhancement module 10 can generate scaling coefficients to compensate for the energy reduction caused by the equalization module 12 (ie, the minimum mean square error equalizer). Please refer to FIG. 5 and FIG. 6 . FIG. 5 is a constellation diagram of a plurality of equalized signals output by the equalization module 12 , and FIG. 6 is a constellation diagram of a plurality of scaled signals generated by the equalization enhancement module 10 . Due to the energy reduction caused by the equalization module 12, the ratio of the multiple equalized signals located in a specific region R ₀ is 52%. If the multiple equalized signals output by the equalization module 12 are directly demodulated, the symbol element The error rate or bit error rate increases. In contrast, through the scaling factor generated by the equalization enhancement module 10, the constellation points of the multiple scaled signals can be spread out, and the ratio of the multiple scaled signals located in the specific region R ₀ is reduced to 25%. Demodulating the scaling coefficients generated by the enhancement module 10 can reduce the symbol error rate or the bit error rate and improve the performance of the demodulation system 1 .

On the other hand, the demodulation system 1 can be used to demodulate a frame (Frame) FR. Specifically, the frame FR may include a header subframe Header and a data subframe Data, as shown in FIG. 7 . The frame FR can be transmitted to a channel by a transmitter, and the demodulation system 1 can receive the received signals y ₁ ˜y _N corresponding to the frame FR from the channel, wherein the received signals y _{1 ˜yn} can be received corresponding to the header subframe Header Signals y _n+1 ˜y _N may correspond to data subframes Data. The demodulation system 1 can generate the scaling coefficient g _n (ie, the last updated scaling coefficient) according to the received signals y ₁ to y _n in the above-mentioned manner, and then according to the scaling coefficient g _n to its subsequent received signal _yn corresponding to the data subframe Data ₊₁ to y _N for demodulation. In this way, the information contained in the frame FR can be more accurately demodulated, so as to improve the system performance.

The operation flow of the equalization enhancement module for generating the scaling signal can be further summarized as a first equalization enhancement flow 80 , please refer to FIG. 8 , which is a schematic diagram of the equalization enhancement flow 80 according to an embodiment of the present invention. The equalization enhancement process 80 can be performed by the first equalization enhancement module, which includes the following steps:

Step 800: Start.

Step 802 : Multiply the equalized signals x ₁ ˜x _n-1 by a scaling factor g to obtain the scaling signals gx ₁ ˜gx _n-1 .

Step 804 : Determine whether the corresponding constellation points of the scaling signals gx ₁ ˜gx _n-1 are located in the specific region R, and generate determination results hit ₁ ˜hit _n-1 .

Step 806 : Calculate an intra-area ratio In according to the judgment results hit ₁ ˜hit _{n-1 ,} wherein the intra-area ratio In is related to the ratio of the scaling signals gx ₁ ˜gx _{n -1} in the specific area R.

Step 808: Adjust the scaling factor g according to the intra-area ratio I _n .

Step 810: End.

亦符合本发明的要求。In the equalization enhancement process 80, the coefficient value of the scaling coefficient g may vary with time, that is, the coefficient value of the scaling coefficient g may be the scaling coefficients _g1 -gn in the first time interval to the _nth time interval, respectively. In addition, in step 806, the equalization enhancement module can use the recursive averaging method to calculate the intra-area ratio I _n , that is, the calculated intra-area _ratio In is I _k+1 =αhit _k +(1−α)I _k , in addition to this In addition, the equalization enhancement module can also directly calculate the _ratio In in the region as

It also meets the requirements of the present invention.

In addition, in step 808, the equalization enhancement module can determine whether the intra-scale ratio I _n is greater than the specific ratio IR, and when the intra-scale ratio I _n is greater than the specific ratio IR, the equalization and enhancement module calculates the scaling coefficient g as a temporarily stored scaling coefficient g ₋₁ increases the first specific value Δg ₁ (ie g=g _{−1 +} Δg ₁ ); when the ratio In within the region is smaller than the specific ratio IR, the scaling factor calculated by the equalization enhancement module is the temporary storage scaling factor g ₋₁ minus Go to the second specific value Δg ₂ (ie g _k+1 =g _k −Δg ₂ ). In addition, the equalization enhancement module can also calculate the scaling factor g as g=g _{−1 +} μ(In −IR), which also meets the requirements of the present invention. For the operation details of the rest of the equalization enhancement process 80, reference may be made to the above-mentioned relevant paragraphs, which will not be repeated here.

On the other hand, the equalization enhancement module is not limited to be implemented by special application integrated circuits. Please refer to FIG. 9 , which is a schematic diagram of an equalization enhancement module 90 according to an embodiment of the present invention. The equalization enhancement module 90 includes a processing unit 902 and a storage unit 904 . The aforementioned equalization enhancement process 80 can be compiled into a program code 908 and stored in the storage unit 904 to instruct the processing unit 902 to execute the equalization enhancement process 80 . The processing unit 902 may be a central processing unit (CPU), a digital signal processor (DSP) or a microprocessor (Microprocessor), but not limited thereto, the storage unit 904 may be a read-only read-only memory (ROM) or a non-volatile memory (non-volatile memory, for example, an electronically erasable programmable read only memory, EEPROM) or a flash memory )), but not otherwise.

It should be noted that the foregoing embodiments are used to illustrate the concept of the present invention, and those skilled in the art can make various modifications accordingly, but are not limited thereto. For example, the foregoing embodiments are described by taking the received signals y _{1 ˜yn} as symbol signals with four-bit phase shift modulation (QPSK) as an example, but the present invention is not limited to this, the received signals y _{1 ˜yn} are It can also have a symbol signal with Quadrature Amplitude Modulation (QAM), Phase Shift Keying (PSK) or Amplitude Phase Shift Keying (APSK), which also belongs to the scope of the present invention. . In addition, the equalization module 12 is not limited to the minimum mean square error equalizer, as long as the energy of the equalized signal generated by the equalization module 12 is not greater than the energy of the received signal generated by the equalization module 12, the equalization enhancement of the present invention can be used. The module compensates for the energy reduction caused by the equalization module 12 to further improve the system performance of the demodulation system 1 .

It can be seen from the above that the present invention adjusts the scaling factor according to the ratio of the scaling signal in a specific area, so as to compensate the energy reduction caused by the equalization module (minimum mean square error equalizer), further reduce the symbol error rate or bit error rate, and improve the solution. Efficiency of the modulation system.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (18)

1. An equalization enhancement module, comprising: a multiplying unit for multiplying the multiple equalization signals by different scaling coefficients to obtain multiple scaling signals; a judging unit, coupled to the multiplying unit, for judging whether the corresponding constellation points of the plurality of scaled signals are located in a specific area, and generating a plurality of judgment results; a scale calculation unit, coupled to the judgment unit, for calculating an area scale according to the plurality of judgment results, wherein the area scale is related to a scale at which the plurality of scaling signals are located in the specific area; and A coefficient calculation unit, coupled to the scale calculation unit, is used for calculating the scaling coefficient according to the scale in the area. 2 . The equalization enhancement module as claimed in claim 1 , wherein the ratio calculation unit comprises an average unit, and the average unit calculates the intra-area ratio according to the plurality of judgment results and an average coefficient. 3 . 3. The equalization enhancement module of claim 2, wherein the averaging unit comprises: a first multiplier for multiplying a ratio in a temporary storage area by a first coefficient to generate a first multiplication result, wherein the first coefficient is 1 minus the average coefficient; a first adder coupled to the first multiplier for adding the first multiplication result and a first signal to generate a first addition result, wherein the first signal is related to the multiple one of the judgment results and the average coefficient; and A first register, coupled to the first adder, is used for outputting the ratio within the region as the first addition result. 4 . The equalization enhancement module of claim 3 , wherein when the determination result shows that a scaled signal of the plurality of scaled signals is located within the specific area, the first signal is the average coefficient, and when 4 . When the judgment result shows that the zoom signal is outside the specific area, the first signal is 0. 5 . The equalization enhancement module of claim 3 , wherein the averaging unit further comprises a multiplexer, coupled to the first adder, wherein when the judgment result shows the difference of the plurality of scaled signals. 6 . When a scaling signal is located within the specific area, the first signal generated by the multiplexer is the average coefficient. When the determination result shows that the scaling signal is located outside the specific area, the multiplexer generates the average coefficient. The first signal is zero. 6 . The equalization enhancement module as claimed in claim 1 , wherein when the ratio within the region is greater than a specific ratio, the coefficient calculation unit calculates the scaling factor to add a first specific value to a temporarily stored scaling factor. 7 . 7 . The equalization enhancement module of claim 6 , wherein when the ratio within the region is smaller than the specific ratio, the coefficient calculation unit calculates the scaling coefficient as the temporarily stored scaling coefficient minus a second specific value. 8 . 8. The equalization enhancement module of claim 6, wherein the coefficient calculation unit comprises: a subtractor for generating a subtraction result of the ratio in the region and the specific ratio; a second multiplier, coupled to the subtractor, for multiplying the subtraction result by an adjustment coefficient to generate a second multiplication result; a second adder, coupled to the second multiplier, for adding the second multiplication result and the temporarily stored scaling coefficient to generate a second addition result; and A second register, coupled to the second adder, is used for outputting the scaling coefficient as the second addition result. 9. A demodulation system, comprising: The first equalization module is used to equalize multiple received signals to generate multiple equalized signals; a meta-judgment module; and An equalization enhancement module is coupled between the equalization module and the symbol judgment module, and the equalization enhancement module includes: a multiplying unit for multiplying the plurality of equalization signals by different scaling coefficients to obtain a plurality of scaling signals; a judging unit, coupled to the multiplying unit, for judging whether the plurality of scaling signals are located in a specific area, and generating a plurality of judging results; a ratio calculation unit, coupled to the judgment unit, for calculating a ratio within a region according to the plurality of judgment results; and a coefficient calculation unit, coupled to the scale calculation unit, for calculating the scaling coefficient according to the scale in the area; Wherein, the symbol determination module demodulates the plurality of scaled signals. 10. The demodulation system of claim 9, wherein the equalization module is a minimum mean square error equalizer. 11 . The demodulation system of claim 9 , wherein the energy of the plurality of equalized signals generated by the equalization module is not greater than the energy of the corresponding plurality of received signals. 12 . 12. An equalization enhancement method capable of improving the performance of a demodulation system, comprising: Multiply the multiple equalization signals by different scaling coefficients to obtain multiple scaling signals; Judging whether the corresponding constellation points of the plurality of zoomed signals are located in a specific area, and generating a plurality of judgment results; calculating an intra-area ratio according to the plurality of determination results, wherein the intra-area ratio is related to a ratio in which the plurality of zoom signals are located in the specific area; and According to the scale in the area, the scaling factor is calculated to make the scale in the area gradually approach a specific scale. 13. The equalization enhancement method as claimed in claim 12, wherein the step of calculating the ratio within the region according to the plurality of judgment results comprises: According to the plurality of judgment results and an average coefficient, the area ratio is calculated. 14. The equalization enhancement method of claim 13 , wherein the step of calculating the ratio within the region according to the plurality of judgment results and the average coefficient comprises: multiplying a ratio in the temporary storage area by a first coefficient to generate a first multiplication result, wherein the first coefficient is 1 minus the average coefficient; adding the first multiplication result and a first signal to generate a first addition result, wherein the first signal is related to a determination result among the plurality of determination results and the average coefficient; and The ratio within the region is output as the first addition result. 15 . The equalization enhancement method of claim 14 , wherein when the determination result shows that a scaled signal of the plurality of scaled signals is located within the specific area, the first signal is generated as the average coefficient, 15 . When the determination result shows that the zoom signal is outside the specific area, the first signal is generated to be 0. 16. The equalization enhancement method as claimed in claim 12, wherein the step of calculating the scaling factor according to the scale in the area comprises: When the scale in the area is greater than the specific scale, the scaling factor is calculated to add a first specific value to a temporarily stored scaling factor. 17. The equalization enhancement method as claimed in claim 16, wherein the step of calculating the scaling factor according to the scale in the area further comprises: When the scale in the area is smaller than the specific scale, the calculated scaling factor is the temporarily stored scaling factor minus a second specific value. 18. The equalization enhancement method as claimed in claim 16, wherein the step of calculating the scaling factor according to the scale in the area comprises: produces the result of subtracting one of the proportions in the area and that particular proportion; multiplying the subtraction result by an adjustment coefficient to generate a second multiplication result; adding the second multiplication result and the temporarily stored scaling factor to generate a second adding result; and obtaining the scaling factor as the second adding result.

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