JP2003512764A - Adaptive digital beamforming receiver for improving signal reception quality - Google Patents

Abstract

(57) SUMMARY An apparatus and method for improving signal reception quality in a signal receiver are disclosed. The apparatus includes a beamforming circuit and a decision feedback equalization circuit. The beam forming circuit includes two circuit branches each having a radio frequency (RF) tuner, an intermediate frequency (IF) mixer, and a feedforward equalizer circuit, which can be coupled to an antenna, and an adder. In a decision feedback equalizer circuit, a decision device coupled to the output of the adder circuit includes an equalizer in the feedforward equalizer circuit for reducing the interference signal by electronically forming a zero in the direction of the interference signal. Change the modifier coefficient.

Description

Detailed Description of the Invention

The present invention relates generally to antenna systems and signal receivers, and more particularly to apparatus and methods for improving reception of signals such as digital television signals such as ATSC 8-VSB signals.

Many digital television receivers have internal antennas and are connected to indoor antennas. In such digital television receivers, the presence of numerous signal echoes caused by obstacles in the room causes problems in receiving good quality signals. Many signal echoes are interfering signals (i.e., multipath delays) that arrive late at the antenna. When the television receiver is connected to an easily accessible indoor antenna, the internal antenna is manually rotated to maximize the main signal and minimize unwanted interference signals caused by multiple signal echoes of the main signal. Or it can be adjusted. If the television receiver has an internal antenna that is not easily accessible, the entire television receiver must be manually rotated or adjusted to make the desired adjustments.

Therefore, it is necessary to improve the signal reception quality of a television signal in a television receiver having an internal antenna and in a television receiver connected to an antenna arranged indoors. A desired system for improving the signal reception quality of such television signals should not require manual adjustment of either the antenna or the entire television set.

To address the above-mentioned prior art problem, the present invention provides a television receiver interference signal caused by the presence of multiple signal echoes formed by obstacles in the room in which the television receiver antenna is located. It is an object of the present invention to provide an apparatus and method for automatically adapting a television signal in a television receiver for minimizing (zeroing).

It is important to recognize that the apparatus and method of the present invention is not limited to improving television signals. Those skilled in the art will appreciate that the principles of the present invention can be successfully applied to other types of signals. However, in the following description, a digital television signal is used as an example.

A typical digital television signal is the ATSC 8-VSB signal. ATSC
Is an abbreviation for Advanced Television Standards Committee. 8-VSB is
Refers to a television signal modulation format in which the television signal has eight vestigial sidebands. Typical television signal carrier frequencies are in the frequency range of 470 MHz to 800 MHz.

The present invention provides an apparatus and method for electronically modifying a television signal that is corrupted by the presence of the signal echo of the main signal in order to minimize the signal echo (ie to zero the interfering signal). Such electronic modification of the signal is called beamforming.

In the preferred embodiment of the invention, the invention includes a beamforming circuit and a decision feedback equalization circuit. The beam forming circuit comprises (1) two circuit branches each having a radio frequency (RF) tuner, an intermediate frequency (IF) mixer, and a feedforward equalization circuit that can be coupled to an antenna; and (2) A first adder circuit. The beam forming circuit modifies the input signal to electronically form a beam in the direction of the desired signal and to electronically form a zero in the direction of the interfering signal.

The first antenna receives a signal and transmits the signal through a first radio frequency (RF) tuner, a first intermediate frequency (IF) circuit, and a first analog to digital converter. Transmit to the first feedforward equalization circuit. Similarly, the second antenna receives the signal and passes the signal through the second RF tuner, the second IF mixer, and the second analog-to-digital converter to the second feedforward equalization circuit. Send.

The output of the first feedforward equalization circuit and the output of the second feedforward equalization circuit are added in the first addition circuit and used as an input to the decision feedback equalization circuit. The beam forming circuit includes a first RF tuner to a first RF tuner.
It includes a first circuit branch to a feedforward equalizer circuit, a second circuit branch from a second RF tuner to a second feedforward equalizer circuit, and a first adder circuit.

The decision feedback equalization circuit includes a second addition circuit, a decision device, and a feedback equalization circuit. The second adder circuit is the first feedback equalizer circuit.
Is an element of. The second summing circuit receives the signal from the first summing circuit of the beamforming circuit and combines this signal with the signal from the feedback equalization circuit to generate an input signal to the decision device. The feedback equalization circuit is connected to the output of the decision circuit to sample the output signal exiting the decision circuit. The feedback equalizer circuit provides a modified version of its output signal to a second adder circuit, which is used to generate the input signal to the decision circuit as described above.

The decision circuit calculates the error in the received signal due to the interfering signal resulting from the echo of the main signal. The decision device uses an adaptive algorithm to calculate a correction for the signal. The determiner applies these corrections to the signal to electronically form the beam in the direction of the desired signal and electronically form a zero in the direction of the interfering signal. As a result, the signal reception quality is significantly improved.

The deciding device also has a control line coupled to the first feedforward equalization circuit, the second feedforward equalization circuit and the feedback equalization circuit.
The decision device may send a control signal over the control line to change some or all of the coefficients in these three equalization circuits to change the operating characteristics of the equalization circuits.

Although the invention has been described in the form of using two antennas, it is also possible to use the invention in a system with more than two antennas. However, the use of more than two antennas makes the present invention more complex and more expensive than systems with two antennas.

The above is a broad description of the features and technical advantages of the present invention so that those skilled in the art may understand the following description of the present invention in more detail. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention. Those skilled in the art should recognize that the concepts and specific embodiments disclosed as a basis for modifying and designing other structures for the same purpose of the present invention can be easily used. Those skilled in the art should recognize that such equivalent constructions do not depart from the broadest spirit and scope of the present invention.

Before the detailed description, some words and phrases used throughout this application are defined as follows. The term "comprising" and variations thereof are meant to be included without limitation. The term “or” is inclusive and / or means,
Communicating with, associated with, included in, contained in, contained in, connected to, connected to, included in, included in, included in, and associated with, the phrases "associated with" and "associated with" and variations thereof. Is possible, co-operates with, is sandwiched between, is juxtaposed with,
Can mean, have, be surrounded by, be surrounded by, have the property of. The term "controller" refers to any device, system, that controls at least one operation,
Or any part thereof, and such a device means hardware, firmware, or software, or a combination of at least two of these. The functionality associated with any particular controller can be centralized or distributed, either locally or remotely. Definitions for some words and phrases are provided throughout this application. Persons skilled in the art should understand that in many, and most often, such definitions will apply to previous and subsequent uses of the defined words and phrases.

For a more complete understanding of the present invention and its advantages, please refer to the following description, taken with the accompanying drawings, in which like reference numbers indicate like elements. 1 to 4 described below and the various embodiments used to explain the principles of the invention herein are for illustration and are understood to limit the scope of the invention. Should not be. Those skilled in the art will understand that the principles of the present invention may be implemented by a suitably arranged signal receiver.

FIG. 1 illustrates an adaptive digital beamforming receiver 10 according to a preferred embodiment of the present invention.
It is a figure which shows 0. In this embodiment of the invention, the invention is directed to beam forming circuit 200.
And a decision feedback equalization circuit 300. The beam forming circuit 200 includes two branches. The first branch of beamforming circuit 200 includes a radio frequency (RF) tuner 222 that can be coupled to antenna 220. RF tuner 222
Are coupled to an intermediate frequency (IF) mixer 224. The RF tuner 222 and the IF mixer 224 together downconvert the RF signal received from the antenna 220 into an analog baseband signal. The IF mixer 224 is an analog / digital converter 2 that converts an analog baseband signal into a digital baseband signal.
26. The analog to digital converter 226 is coupled to the feedforward equalization circuit 228. Under the control of the decision device 330, the feedforward equalization circuit 228 modifies the input signal in order to form a beam in the direction of the desired signal and / or a zero in the direction of the interfering signal.

Similarly, the second branch of beamforming circuit 200 includes a radio frequency (RF) tuner 242 that can be coupled to antenna 220. The RF tuner 242 is
It is coupled to an intermediate frequency (IF) mixer 244. The IF mixer 244 is an analog
Coupled to digital converter 246. The analog / digital converter 246 is
Coupled to feedforward equalization circuit 248. Under the control of the decision device 330,
The feedforward equalization circuit 248 modifies the input signal to form a beam in the direction of the desired signal and a zero in the direction of the interfering signal.

The output signal from feedforward equalization circuit 228 and the output from feedforward equalization circuit 248 are coupled to first adder circuit 250. The first adder circuit 250 adds the output signals from the feedforward equalization circuits 228 and 248. The signals resulting from the summing of the signals by the first summing circuit 250 represent four separate signal combinations, each modified to form a beam in the direction of the desired signal and a zero in the direction of the interfering signal. Improved signal. Signal information missing from the signal (due to interference) may be present in other signals and vice versa. The additive combination of the two signals produces an improved signal that is less susceptible to interfering signals caused by multipath delays.

Antennas 220 and 240 may be vertical single dipole omnidirectional antennas. The antennas 220 and 240 have a twentieth of the wavelength of the received signal
To one (1) wavelength of the received signal. For example, if the carrier frequency is 470 MHz, the maximum separation between antennas 220 and 240 would be about 0.63 meters or about 24.0 inches. Therefore, the antennas 220 and 240 can be used as parts of the internal antenna of the television receiver using the present invention.

RF tuners 222 and 242, IF mixers 224 and 244, and analog-to-digital converters 226 and 246 can all be devices well known in the art.

The first feedforward equalization circuit 228 receives the digital form of the signal received by the antenna 220 from the first analog-to-digital converter 226. The first feedforward equalization circuit 228 includes a circuit (not shown) that compensates for amplitude and phase shift distortions that the signal may capture when transmitted over a dispersive transmission line. In this case, the dispersive transmission line is the atmosphere.

There are many different types of prior art feedforward equalizer circuits that can be used as the first feedforward equalizer circuit 228 of the present invention. One of the simplest types is the linear transversal equalizer. A linear transversal equalizer samples the values of an input signal in a tapped delay line with N tap points and multiplies these sampled values by N numerical coefficients, resulting in The resulting values are summed to form the signal representation. The numerical coefficient is a numerical value representing a weighting coefficient. The number of numerical coefficients can range from one coefficient to, for example, 100 or more coefficients. The resulting signal is mathematically

[0025]

[Equation 1] Where y _n is the output, x _{1, n} is the nth sample of the input signal from the first antenna 220, and a _{l, i} is the first feedforward equalization circuit 228.
, N is the number of coefficients of the first feedforward equalization circuit 228. By adjusting the coefficients, it is possible to change the overall signal pattern so as to place the zero pattern in the direction of the undesired interference signal.

Similarly, the second feedforward equalization circuit 248 receives the digital form of the signal received by the antenna 240 from the second analog to digital converter 246. The second feedforward equalization circuit 248 may have the same structure and function as the first feedforward equalization circuit 228. The second feedforward equalizer circuit 248 is mathematically

[0027]

[Equation 2] Where y _n is the output, x _{2, n} is the nth sample of the input signal from the second antenna 240, and a _{2, j} is the second feedforward equalization circuit 248.
, And N is the number of coefficients of the second feedforward equalization circuit 248.

Although described herein using a linear transversal equalizer, it should be understood that the invention is not limited to this particular type of equalizer. Other types of equalizers may be used to implement the invention.

The decision feedback equalization circuit 330 of the present invention includes a second adder circuit 320, a decision circuit 330, and a feedback equalization circuit 340. The second summing circuit 320 of the decision feedback equalization circuit 300 is coupled to the first summing circuit 250 of the beam forming circuit 200. The second adder circuit 320 is the same as the first adder circuit 250.
The output signal from the feedforward equalization circuit 228 and the output signal from the feedforward equalization circuit 248 are received. The second summing circuit 320 also receives an input signal from the feedback equalization circuit 340, as described in detail below.

The second adder circuit 320 is coupled to the decision device 330. The determination device 330
It can be a digital signal processor (DSP) or other type of electronic controller.
The decision device 330 receives the signal from the second summing circuit 320.

The decision device 330 performs two operations. The first action is to make a determination as to which valid symbol (in this case, the eight levels of 8-VSB) the input symbol is closest to. This can be called a splicer. The feedback equalizer circuit 340 is passed this valid symbol (ie, decision output).
The second operation of the decision device 330 is based on the difference between the decision device input and the decision device output (ie, symbol error). Symbol error is the mean squared error (MS
E) is used in an adaptive algorithm for the decision (for example the least mean square algorithm) or a blind application algorithm (for example the Constant Modulus algorithm) to update the equalizer coefficients so that E) is reduced.

The decision unit 330 can be any of a number of equalizer adaptation algorithms known in the art. In the preferred embodiment of the present invention, the equalizer adaptation algorithm used is the least mean square (LMS) method. This is called the LMS algorithm. Another equalizer application algorithm suitable for use is the recursive minimum square (R
LS) method. This is called the RLS algorithm. Other similar algorithms are also suitable for use. The description of the preferred embodiment of the invention is not intended to be limited to the types of algorithms that may be used in accordance with the concepts of the invention.

The adaptive algorithm calculates the amplitude of the signal and the amount of phase shift error. The adaptive algorithm calculates the amount of correction needed to correct the error. The determining device 330 includes a first feedforward equalization circuit 228 and a second feedforward equalization circuit 2
48 and the value of the coefficient of the feedback equalizer 340 is changed. In this way, the decision circuit modifies the signal to produce an improved signal by electronically forming the beam in the direction of the desired signal and electronically forming a zero in the direction of the interfering signal.

Feedback equalization circuit 340 is coupled to the output of decision device 330 to sample the output signal of decision circuit 330. Feedback equalization circuit 340 has an output coupled to the input of second summing circuit 320. This allows the second summing circuit 320 to access the output signal of the feedback equalization circuit 340. The second addition circuit 320 feeds back from a signal that is the sum of the output signal from the first feedforward equalization circuit 228 and the output signal from the second feedforward equalization circuit 248. The output signal of the equalization circuit 340 is subtracted.

The feedback equalization circuit 340 is a first feedforward equalization circuit 228.
, And a second feedforward equalization circuit 248. The output signal of the feedback equalization circuit 340 is, mathematically,

[0036]

[Equation 3] Where y _n is the output, y _nk is the input signal from the decision unit 330, b _k is the coefficient of the feedback equalization circuit 340, and M is in the feedback equalization circuit 340. Is the number of coefficients of.

[0037]   Therefore, the input signal to the decision device 330 is the following mathematical equation:

[0038]

[Equation 4] , Where y _n is the estimated output, x _{1, n} is the nth sample of the input signal from the first antenna 220, and x _{2, n} is the second antenna 24.
It is the nth sample of the input signal from 0 and y _nk is the input signal from the decision unit 330. The value a _{l, i} is the coefficient of the first feedforward equalization circuit 228, the value a _{2, j} is the coefficient of the second feedforward equalization circuit 248, and the value b _k is the value of the feedback equalization circuit 340. It is a coefficient. The value N is the number of coefficients in the first feedforward equalization circuit 228 and the second feedforward equalization circuit 248, and M is the number of coefficients in the feedback equalization circuit 340. This equation represents the input to the decision device 330.

The decision unit 330 is for the coefficients for each of the three equalization circuits, namely the first feedforward equalization circuit 228, the second feedforward equalization circuit 248, and the feedback equalization circuit 340. Use the above input values for y _n to sequentially set up and solve a set of linear equations to determine the corrected value of

The equalizer coefficients (also referred to as tap weights) have the following equations to minimize the mean square error (MSE) ε _k :

[0041]

[Equation 5] , Where I _k is the kth information symbol to be transmitted,

[0042]

[Outer 1] Is the estimate of the kth symbol at the output of the equalizer. Estimated symbols

[0043]

[Outside 2] Is the expression

[0044]

[Equation 6] Where x _k is the sampled channel output and d _j is the equalizer coefficient.

A set of linear equations can be set based on the orthogonal principle of mean square estimation. The equalizer coefficients d _j are chosen such that the mean square error (MSE) ε _k is orthogonal to the complex conjugate x _k ^* of the transmitted symbol sequence, which is

[0046]

[Equation 7] , Where d _j is the equalizer coefficient, x _j is the equalizer input, x _j ^* is the complex conjugate, E (X) is the expected value,

[0047]

[Outside 3] Is the estimated output of the equalizer. This equation includes the statistical autocorrelation function of the input signal and the cross-correlation between the input and the expected signal.

In order to find the optimum equalizer tap coefficient, the above linear equations must be solved. This means that for N tap equalizers, N simultaneous equations must be solved.

To solve the above equation, an adaptive algorithm such as the least mean square (LMS) algorithm is used. In the LMS algorithm, the mean square error (MSE
) The slope estimate is found, and vice versa, the tap value is updated to bring the MSE closer to the minimum. The LMS algorithm is

[0050]

[Equation 8] Where d _n (k) is the nth equalizer tap at time k,
T is the signaling interval, e _k is the error signal and Δ is the variable adaptation constant (step size). The value e _k x * (kT-nT) is an estimate of the gradient vector obtained from the data.

The LMS algorithm does not require any knowledge about the statistical value of the signal or about the noise. The new equalizer coefficients are deduced from the previous values of the coefficients minus the error function. The larger Δ is, the faster the convergence is, and the smaller Δ is, the slower the convergence is. The LMS algorithm is easy to implement but slow to converge.

After the determiner 330 has calculated the new equalizer coefficients for the equalizer circuit, the determiner 330 sends the new equalizer coefficients to the first feedforward equalizer circuit 228 via control line 333. . The determining device 330 also receives a second line via the control line 335.
Of the new equalizer coefficient to the feedforward equalizer circuit 248 of the control line 33.
Send the new equalizer coefficients to the feedback equalizer 340 via 7. The iterative process continues until the mean square error is minimized. In this way, the decision device 330 produces an improved signal for the signal receiver 440.

To show how the present invention works in a video device, a brief description of the video device is provided. For purposes of example, the described video device will be described as a high definition television signal receiver. The present invention is not limited to use in television signal receivers, and is not limited to personal computer monitors, laptop computer monitors, handheld computer monitors, handheld video devices, and any capable of displaying video signals. Note that it is a computer monitor.

FIG. 2 is a block diagram showing a high definition television signal receiver in which the present invention may be implemented. The television signal is received by antenna 520, transmitted to RF tuner 522, and then transmitted to IF mixer 524. The signal is transmitted to the demodulator and channel decoder circuit 526. The signal is then a transport demultiplexer and decoding circuit 53 in which the audio, video and data parts of the signal are separated from each other.
Sent to 0. The video portion of the signal is transmitted to video decoder 540. The audio portion of the signal is transmitted to audio decoder 542. The data portion of the signal is transmitted to the data decoder 544. The video portion of the signal is the video display circuit 55
0, and the audio portion of the signal is sent to the audio speaker unit 552.

FIG. 3 is a block diagram showing an embodiment of the present invention in the video device 600. The video device 600 is a television signal receiver having a first antenna 520 and a second antenna 521. RF tuner 522 of television signal receiver 500
The IF mixer 524 has been replaced by the beam forming circuit 200 and decision feedback equalization circuit 300 of the present invention. The video device 600 shown in FIG. 3 is an adaptive digital beamforming receiver as an example of the present invention.

In video device 600, decision feedback equalization circuit 300 sends the improved signal of the present invention to MPEG-2 decoder 620. MPEG-2 decoder 6
20 is a type well known in the prior art. The signal video portion is transmitted to the video display unit 630. The audio portion of the signal is transmitted to audio speaker 640.

FIG. 4 is a flow chart illustrating operation of an exemplary adaptive digital beamforming receiver according to one embodiment of the present invention. Step 700 is the step of demodulating the first analog signal from the first antenna. Step 702 is a step of converting the first analog signal into a digital signal. Step 704 is the step of modifying the first signal in the first feedforward equalizer to correct the distortion in the first signal.

Similarly, step 706 is a step of demodulating the second analog signal from the second antenna. Step 708 is the step of converting the second analog signal into a digital signal. Step 710 is the step of modifying the second signal in the second feedforward equalization circuit to correct the distortion of the second signal.

Step 712 is a step of adding the modified first signal and the modified second signal. Step 714 is the step of adding the feedback signal from the feedback equalization circuit to the sum of the modified first signal and the modified second signal to produce an improved signal.

Step 716 adjusts the coefficients of the first feedforward equalization circuit, thereby adjusting the coefficients of the second feedforward equalization circuit,
It also includes modifying the improved signal in a decision device having an adaptive algorithm by adjusting the coefficients of the feedback equalization circuit.

Although the present invention has been described in detail, those skilled in the art should understand that various changes, substitutions and modifications can be made without departing from the spirit and scope of the present invention.

[Brief description of drawings]

[Figure 1]   FIG. 3 is a block diagram showing an adaptive digital beam forming receiver of the present invention.

FIG. 2 is a block diagram showing a high definition television signal receiver in which the present invention may be implemented.

[Figure 3]   FIG. 4 is a block diagram illustrating an embodiment of the present invention in a signal receiver of a video device.

FIG. 4 is a flow chart illustrating operation of an exemplary adaptive beamforming receiver according to one embodiment of the invention.

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Claims (21)

[Claims] 1. An apparatus for improving signal reception quality in a signal receiver having a first antenna and a second antenna, the apparatus being capable of being coupled to the first antenna. A first feedforward equalization circuit including an equalization circuit capable of modifying the signal from the first antenna to correct for distortion in the signal from the second antenna; And a second feedforward equalization circuit including an equalization circuit capable of modifying the signal from the second antenna to correct distortion in the signal from the second antenna. A first input coupled to the first feedforward equalization circuit, and a second input
A modified input signal from the first feedforward equalization circuit and a modification from the second feedforward equalization circuit. And a first feedforward equalization circuit coupled to the output of the adder and capable of monitoring the signal on the output of the adder. And the second feedforward equalization circuit to reduce an interference signal from at least one of the second feedforward equalization circuit, the first feedforward equalization circuit and the second feedforward equalization circuit depending on a value of the adder output signal. And a decision device for changing the equalizer coefficient in the feedforward equalization circuit of. 2. A feedback equalization circuit coupled to said decision device and having an equalization circuit for modifying an output signal of said decision device, wherein a third input of said adder is an output of said feedback equalization circuit. The device of claim 1 coupled to. 3. The apparatus of claim 1, wherein the decision device comprises a microprocessor capable of executing an adaptive algorithm. 4. The adaptive algorithm is a least mean square.
) Method using the method of claim 3. 5. The microprocessor is capable of adjusting the equalizer coefficient in the first feedforward equalization circuit, the second feedforward equalization circuit, and the feedback equalization circuit. The device of claim 3, wherein the device is capable. 6. The at least one of the first feedforward equalization circuit, the second feedforward equalization circuit, and the feedback equalization circuit is a linear transversal equalizer. 1. The device according to 1. 7. The first feedforward equalization circuit comprises a first RF receiver circuit capable of receiving an RF signal from the first antenna and converting the RF signal into a digital baseband signal. The apparatus of claim 1, coupled to the first antenna. 8. The second feedforward equalization circuit comprises a second RF receiver circuit capable of receiving an RF signal from the second antenna and converting the RF signal into a digital baseband signal. The apparatus of claim 1, coupled to the second antenna. 9. A first antenna coupled to a first antenna, capable of receiving a first RF signal from the first antenna and converting the first RF signal into a first digital baseband signal. One RF receiver circuit and a second antenna for receiving a second RF signal from the second antenna and converting the second RF signal to a second digital baseband signal. With a possible second RF receiver circuit, it is possible to receive said first digital baseband signal and it is possible to modify said first digital baseband signal to minimize its distortion. A first feedforward equalization circuit including an equalization circuit and the second digital baseband signal can be received to minimize distortion in the second digital baseband signal. A second feedforward equalization circuit including an equalization circuit capable of modifying the second digital baseband signal to: and a first input coupled to the first feedforward equalization circuit. , A second input coupled to a second feedforward equalization circuit, the modified signal from the first feedforward equalization circuit, and a second input from the second feedforward equalization circuit. An adder capable of adding the modified signal from the modified signal, and coupled to the output of the adder, capable of monitoring the signal on the adder output, In order to minimize the distortion of at least one of the first feedforward equalization circuit and the second feedforward equalization circuit, depending on the value of the adder output signal, the first feedforward equalization circuit A decision device for changing the equalizer coefficient of at least one of the feedforward equalization circuit and the second feedforward equalization circuit; and a receiver coupled to the decision device for receiving and decoding an output signal from the decision device. An MPEG-2 decoder capable of encoding, and a video coupled to the MPEG-2 decoder capable of receiving and displaying a decoded output signal from the MPEG-2 decoder. A television receiver having a display unit. 10. A feedback equalization circuit coupled to the decision device, the feedback equalization circuit having an equalization circuit for modifying an output signal of the decision device, the third input of the adder. 10. The television receiver of claim 9, wherein is coupled to the output of the feedback equalization circuit. 11. The television set according to claim 9, wherein the determining device comprises a microprocessor capable of executing an adaptive algorithm. 12. The adaptive algorithm is a least mean square.
Television receiver according to claim 11, using method e). 13. The microprocessor is capable of adjusting the equalizer coefficients in the first feedforward equalization circuit, the second feedforward equalization circuit, and the feedback equalization circuit. Television receiver according to claim 11, which is possible. 14. At least one of the first feedforward equalization circuit, the second feedforward equalization circuit, and the feedback equalization circuit is a linear transversal equalizer. Item 9. A television receiver according to Item 9. 15. A method for improving signal reception quality in a signal receiver having a first antenna and a second antenna, for compensating for distortion in a first signal from the first antenna. Modifying the first signal from the first antenna in a first feedforward equalization circuit and a second feed to correct distortion in the second signal from the second antenna. Modifying the second signal from the second antenna in a forward equalizer circuit and modifying the second signal from the first feedforward equalizer circuit to produce a sum of the modified signals. A first signal and the modified second signal from the second feedforward equalization circuit are added, and the sum of the modified signals is monitored in a determining device. And reducing the interfering signal from at least one of the first feedforward equalization circuit and the second feedforward equalization circuit depending on the value of the sum of the modified signals. Changing the equalizer coefficients of the first feedforward equalization circuit and the second feedforward equalization circuit. 16. The step of modifying the equalizer coefficient comprises the steps of: calculating a correction value for the sum of the modified signals by an adaptive algorithm; and the modified signal using the calculated correction values. 16. Changing the value of the sum part of the. 17. The method according to claim 16, wherein the step of calculating the correction value of the signal by the adaptive algorithm is performed by using the adaptive algorithm using the least mean square method. 18. A method for improving signal reception quality in a signal receiver having a first antenna and a second antenna, wherein the RF signal received by the first antenna is a first digital baseband signal. Down-converting the RF signal received by the second antenna into a second digital baseband signal, and correcting the distortion in the first digital baseband signal. Modifying the first digital baseband signal in a first feedforward equalizer circuit, and changing the second digital signal in the second feedforward equalizer circuit to correct distortion in the second digital baseband signal. Modifying the digital baseband signal of and generate a synthetic baseband signal For this purpose, the step of adding the first digital baseband signal and the second digital baseband signal, the step of monitoring the combined baseband signal in a decision device, and the step of And modifying the equalizer coefficients in the first feedforward equalization circuit and the second feedforward equalization circuit to reduce interfering signals in the combined baseband signal. 19. The step of modifying the equalizer coefficient comprises the steps of: calculating a correction value for the sum of the modified signals by an adaptive algorithm; and the modified signal using the calculated correction values. 20. Varying the value of the sum part of the. 20. The method of claim 19, wherein the step of calculating a correction value for the signal with an adaptive algorithm is performed using an adaptive algorithm that uses a least mean square method. 21. A method of improving signal reception quality in a signal receiver having a first antenna and a second antenna, the method comprising: demodulating a first analog signal from the first antenna; Converting the first analog signal into a digital signal, modifying the first signal in a first feedforward equalization circuit to correct for distortion in the first signal, and from the second antenna Demodulating the second analog signal, converting the second analog signal to a digital signal, and modifying the second signal in a second feedforward equalization circuit to correct for distortion in the second signal. And adding the modified first signal with the modified second signal, the modified first signal to produce a combined signal Adding the modified sum of the second signals and the feedback signal from the feedback equalization circuit, adjusting the coefficient of the first feedforward equalization circuit, and the second feedforward equalization circuit. Adjusting the coefficients of the circuit, and modifying the combined signal in a decision device having an adaptive algorithm by adjusting the coefficients of the feedback equalization circuit.