KR101577183B1 - Diversity receiving device and diversity receiving method thereof - Google Patents

Diversity receiving device and diversity receiving method thereof Download PDF

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Publication number
KR101577183B1
KR101577183B1 KR1020140020700A KR20140020700A KR101577183B1 KR 101577183 B1 KR101577183 B1 KR 101577183B1 KR 1020140020700 A KR1020140020700 A KR 1020140020700A KR 20140020700 A KR20140020700 A KR 20140020700A KR 101577183 B1 KR101577183 B1 KR 101577183B1
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South Korea
Prior art keywords
signal
reception sensitivity
tuner
mode
channel
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KR1020140020700A
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Korean (ko)
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KR20150099134A (en
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박상일
김구택
이기섭
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(주)에코프로아이씨티
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Priority to KR1020140020700A priority Critical patent/KR101577183B1/en
Priority to PCT/KR2014/001962 priority patent/WO2015125995A1/en
Publication of KR20150099134A publication Critical patent/KR20150099134A/en
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Publication of KR101577183B1 publication Critical patent/KR101577183B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0871—Hybrid systems, i.e. switching and combining using different reception schemes, at least one of them being a diversity reception scheme

Abstract

A diversity receiving apparatus and method are disclosed. According to the present invention, when the reception sensitivity of the RF signal is good, different channel signals are extracted from the respective RF signals provided from the plurality of antennas, and when the reception sensitivity of the RF signal is bad, Extracts the same channel signal and synthesizes them. According to the present invention, when the reception sensitivity of the RF signal is good, different channel signals are extracted from the respective RF signals provided from the plurality of antennas. When the reception sensitivity of the RF signal is bad, It is possible to stably display one broadcast channel by operating in a diversity system mode in a situation where the RF receiving environment such as a weak electric field is poor. In contrast, in a situation where the RF reception environment is good, the PIP Mode and can simultaneously display two broadcast channels. Accordingly, when the RF reception environment is good, all of the plurality of antennas can be utilized efficiently.

Description

[Technical Field] The present invention relates to a diversity receiving apparatus and a diversity receiving method,

The present invention relates to a diversity receiving apparatus and method, and more particularly, to a diversity receiving apparatus and method that extracts different channel signals from RF signals provided from a plurality of antennas, And more particularly, to an apparatus and method for extracting and combining identical channel signals from RF signals provided from a plurality of antennas.

A diversity scheme is one of techniques for overcoming a fading phenomenon occurring on a wireless channel, and includes a time diversity scheme and a space diversity scheme. The spatial diversity technique is a diversity technique using two or more transmission / reception antennas. When a received signal includes a channel error due to fading, a technique of improving signal quality by combining channel information received through a plurality of antennas to be.

In the case of an antenna system using such a space diversity scheme, when the reception environment is poor, it is advantageous to receive signals more reliably by receiving and combining signals through a plurality of antennas. On the other hand, Even if only one of the plurality of antennas is used, the reception performance can be maintained and the efficiency of the antenna is degraded.

Patent Document 1 discloses a DMB communication system using antenna diversity and a DMB communication method using antenna diversity. In Patent Document 1, a null time interval of a DMB communication standard is defined as Which detects the reception sensitivity of the antenna and processes the antenna switching operation, thereby maintaining optimal reception state while efficiently utilizing hardware and software resources.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a PIP mode in which a user can simultaneously receive two or more broadcast signals by extracting different channel signals from RF signals provided from a plurality of antennas, And extracts and combines the same channel signals from the respective RF signals provided from the plurality of antennas when the reception sensitivity of the RF signal is poor, and to provide a diversity reception apparatus and method.

According to an aspect of the present invention, there is provided a diversity receiving apparatus including an antenna unit including a first antenna and a second antenna; A first tuner for receiving a first RF signal from the first antenna and extracting a first channel signal from the first RF signal and a second tuner for receiving a second RF signal from the second antenna, A tuner unit including a second tuner for extracting the second tuner; A first demodulator for receiving the first channel signal from the first tuner and demodulating the first channel signal and a second demodulator for receiving the second channel signal from the second tuner and demodulating the second channel signal A channel demodulator including a second demodulator; And controlling the first tuner and the second tuner to operate in a first mode for extracting the same channel signal from each other to output a first stream provided from the channel demodulator unit, And an output controller for outputting different first streams and second streams provided from the channel demodulator unit by controlling the second mode to operate in a second mode for extracting different channel signals.

Wherein the output control unit controls the first mode to operate in the first mode if the RF signal reception sensitivity through the antenna unit is smaller than a preset reference reception sensitivity and controls the second mode if the RF signal reception sensitivity is greater than the reference reception sensitivity .

Wherein the output controller determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the BER value is greater than a predetermined reference value and if the BER value is smaller than the reference value, Is greater than the reference reception sensitivity.

The output controller may determine that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the number of times that the BER value is greater than the reference value occurs more than a predetermined number of times during a predetermined period.

Wherein the output control unit determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the SNR is less than a predetermined reference value and if the SNR value is greater than the reference value, It can be determined that the sensitivity is larger than the reference reception sensitivity.

The output controller may determine that the RF signal reception sensitivity is greater than the reference reception sensitivity if the number of times that the SNR value is greater than the reference value occurs more than a predetermined number of times during a predetermined period.

The output control unit may be changed to the first mode or the second mode according to the reception sensitivity of the RF signal through the antenna unit.

According to an aspect of the present invention, there is provided a diversity receiving method including: an antenna unit including a first antenna and a second antenna; A first tuner for receiving a first RF signal from the first antenna and extracting a first channel signal from the first RF signal and a second tuner for receiving a second RF signal from the second antenna, A tuner unit including a second tuner for extracting the second tuner; A first demodulator for receiving the first channel signal from the first tuner and demodulating the first channel signal and a second demodulator for receiving the second channel signal from the second tuner and demodulating the second channel signal, A first mode in which the first tuner and the second tuner extract the same channel signal, and a second mode in which the first tuner and the second tuner extract the same channel signal, and a second demodulator And a second mode in which the second tuner extracts a different channel signal from the second tuner; And outputting a stream provided from the channel demodulator unit.

Wherein the mode control step controls to operate in the first mode if the reception sensitivity of the RF signal through the antenna unit is smaller than a preset reference reception sensitivity, and when the reception sensitivity of the RF signal is higher than the reference reception sensitivity, And the like.

Wherein the mode control step determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the BER value is greater than a preset reference value and if the BER value is smaller than the reference value, It may be determined that the sensitivity is greater than the reference reception sensitivity.

The mode control step may determine that the RF signal reception sensitivity is less than the reference reception sensitivity if the number of times that the BER value is greater than the reference value occurs more than a predetermined number of times during a predetermined period.

Wherein the mode control step determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the SNR is less than a preset reference value and if the SNR value is greater than the reference value, It can be determined that the reception sensitivity is larger than the reference reception sensitivity.

The mode control step may determine that the RF signal reception sensitivity is greater than the reference reception sensitivity if the number of times that the SNR value is greater than the reference value occurs more than a predetermined number of times during a predetermined period.

And changing the first mode or the second mode according to an RF signal receiving sensitivity through the antenna unit.

According to the diversity receiving apparatus and method of the present invention, when the reception sensitivity of the RF signal is good, different channel signals are extracted from the respective RF signals provided from the plurality of antennas. When the reception sensitivity of the RF signal is bad, By extracting and combining the same channel signals from the respective RF signals provided from the antenna, it is possible to stably display one broadcast channel by operating in the diversity system mode in a situation where the RF reception environment such as weak electric field is poor, In a situation where the RF reception environment is good, it is possible to operate in the PIP mode and simultaneously display two broadcast channels. Accordingly, when the RF reception environment is good, all of the plurality of antennas can be utilized efficiently.

1 is a block diagram illustrating a diversity receiver according to a preferred embodiment of the present invention.
2 is a flowchart illustrating a diversity reception method according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of a diversity receiving apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings.

A diversity receiving apparatus according to a preferred embodiment of the present invention will now be described with reference to FIG.

1 is a block diagram illustrating a diversity receiver according to a preferred embodiment of the present invention.

Referring to FIG. 1, a diversity receiving apparatus 100 according to the present invention includes an antenna unit 110, a tuner unit 130, a channel demodulator unit 150, and an output control unit 170.

The antenna unit 110 receives a broadcast signal transmitted from a broadcast station (not shown). To this end, the antenna unit 110 includes a first antenna 111 and a second antenna 113. That is, the antenna unit 110 can receive an RF signal from the outside through the first antenna 111 and the second antenna 113, respectively. The antenna unit 110 provides the received RF signal to the tuner unit 130.

The tuner unit 130 extracts a channel signal from the RF signal received from the antenna unit 110. [ To this end, the tuner unit 130 includes a first tuner 131 and a second tuner 133. That is, the first tuner 131 may receive the first RF signal from the first antenna 111, and may extract the first channel signal from the first RF signal received from the first antenna 111. The second tuner 133 can receive the second RF signal from the second antenna 113 and extract the second channel signal from the second RF signal received from the second antenna 113. The tuner unit 130 Provides the channel demodulator unit 150 with the channel signal extracted from the RF signal.

The channel demodulator unit 150 demodulates the channel signal received from the tuner unit 130. To this end, the channel demodulator unit 150 includes a first demodulator 151 and a second demodulator 153. That is, the first demodulator 151 receives the first channel signal from the first tuner 131, and can demodulate the first channel signal received from the first tuner 131. The second demodulator 153 receives the second channel signal from the second tuner 133 and can demodulate the second channel signal received from the second tuner 133. The channel demodulator 150 demodulates the channel signal and provides the generated stream to the output controller 170.

The output control unit 170 controls the overall operation of the diversity receiving apparatus 100. In particular, the output control unit 170 according to the present invention controls the reception mode of the diversity receiving apparatus 100. Here, in the reception mode, the first mode in which the first tuner 131 and the second tuner 133 extract the same channel signal and the first mode in which the first tuner 131 and the second tuner 133 are different from each other are extracted There is a second mode of operation.

That is, the output control unit 170 controls the tuner unit 130 to operate in a first mode for extracting one channel at a time, outputs the first stream provided from the channel demodulation unit 150, The tuner unit 130 may be controlled to operate in a second mode for extracting two channels and simultaneously output different first and second streams provided from the channel demodulation unit 150. [

For example, when the diversity receiving apparatus 100 is operated in the first mode, each of the first tuner 131 and the second tuner 133 extracts the same channel signal from the RF signal, And outputs the first stream. In this case, the stream output from the diversity receiving apparatus 100 is composed of a video stream for one broadcast channel. That is, the second demodulator 153 operates in a slave mode to improve the diversity performance, and provides the slave channel information to the first demodulator 151 operating as a master mode. Then, the first demodulator 151 performs maximum ratio combination (MRC) on the slave channel information and the channel information of the master provided from the second demodulator 153 to perform error correction on the converted signal, And outputs the corrected signal as a transport stream.

On the other hand, when the diversity receiving apparatus 100 is operated in the second mode, the first tuner 131 and the second tuner 133 respectively extract channel signals different from each other from the RF signal, And outputs the first stream and the second stream. In this case, each of the first demodulator 151 and the second demodulator 153 operates in the master mode to output the first stream and the second stream for the different broadcast channels, respectively. Accordingly, a display device (not shown) receiving a stream from the diversity receiving apparatus 100 can simultaneously display two broadcast channels on a screen through a PIP (Picture In Picture) function or the like.

At this time, if the RF reception sensitivity through the antenna unit 110 is smaller than the predetermined reference reception sensitivity, the output controller 170 controls the first mode to operate. If the RF signal reception sensitivity is higher than the reference reception sensitivity, Can be controlled to be operated. That is, when the signal environment is bad (in the case of moving or in the weak electric field), the output controller 170 controls the diversity receiver 100 to operate in the first mode, which is the diversity system mode, And extracts the same channel signal from the RF signals received from the antennas 111 and 113 which are installed separately from each other. On the other hand, if the signal environment is good, the output controller 170 controls the diversity receiver 100 to operate in the second mode, which is the PIP mode, and receives the signals from the antennas 111 and 113 physically isolated from each other And to extract different channel signals from the RF signal.

The output controller 170 determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the BER (Bit Error Rate) value is greater than a preset reference value, and vice versa, that is, when the BER value is greater than a preset reference value It can be determined that the RF signal reception sensitivity is larger than the reference reception sensitivity. At this time, the output controller 170 may determine that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the number of times that the BER value is greater than a preset reference value occurs more than a predetermined number of times for a predetermined period.

The output controller 170 determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the SNR is less than a preset reference value and vice versa, Value, it can be determined that the RF signal reception sensitivity is larger than the reference reception sensitivity. At this time, the output controller 170 may determine that the RF signal reception sensitivity is greater than the reference reception sensitivity if the number of times that the SNR value is greater than a preset reference value occurs for a predetermined period or more.

Meanwhile, the output control unit 170 may be changed to the first mode or the second mode according to the reception sensitivity of the RF signal through the antenna unit 110. That is, the output controller 170 can change the reception mode so as to operate in the second mode, which is the PIP mode, when the signal environment is improved, while the first mode is the diversity system mode because the signal environment is poor. Likewise, the output controller 170 can change the reception mode to operate in the first mode, which is the diversity system mode, when the signal environment becomes worse during operation in the second mode which is a PIP mode because of a good signal environment.

A diversity reception method of a diversity reception apparatus according to a preferred embodiment of the present invention will now be described with reference to FIG.

2 is a flowchart illustrating a diversity reception method according to a preferred embodiment of the present invention.

Referring to FIG. 2, the diversity receiving apparatus 100 determines a reception mode (S210). That is, the diversity receiving apparatus 100 determines one of a first mode, which is a diversity system mode, and a second mode, which is a PIP mode, according to a signal environment. Here, as described above, the first mode is a reception mode in which the first tuner 131 and the second tuner 133 provided in the diversity receiving apparatus 100 extract the same channel signal. The second mode is a reception mode in which the first tuner 131 and the second tuner 133 provided in the diversity receiving apparatus 100 extract channel signals different from each other.

At this time, the diversity receiving apparatus 100 controls to operate in the first mode when the RF reception sensitivity through the antenna unit 110 is smaller than the predetermined reference reception sensitivity, and when the RF signal reception sensitivity is larger than the reference reception sensitivity, Mode can be controlled. That is, when the signal environment is bad (in the case of moving or in a weak electric field), the diversity receiving apparatus 100 controls to operate in the first mode, which is a diversity system mode, 111, and 113, respectively. On the other hand, when the signal environment is good, the diversity receiving apparatus 100 controls to operate in the second mode, which is the PIP mode, from the RF signals received from the antennas 111 and 113 physically isolated from each other, Respectively.

Here, the diversity receiving apparatus 100 determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the BER (Bit Error Rate) value is greater than a predetermined reference value, and vice versa, that is, The RF signal reception sensitivity can be judged to be larger than the reference reception sensitivity. At this time, the diversity receiving apparatus 100 may determine that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the number of times that the BER value is greater than a preset reference value occurs more than a predetermined number of times for a predetermined period.

The diversity receiving apparatus 100 determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity when the SNR (Signal to Noise Ratio) value is smaller than a preset reference value, and vice versa, If it is larger than the set reference value, it can be determined that the RF signal reception sensitivity is larger than the reference reception sensitivity. At this time, the diversity receiving apparatus 100 may determine that the RF signal reception sensitivity is greater than the reference reception sensitivity if the number of times that the SNR value is greater than a preset reference value occurs for a predetermined period or more.

Then, the diversity receiving apparatus 100 controls to operate in one of the first mode and the second mode according to the reception mode (S230), and outputs a stream (S250). That is, when the receiving mode is the first mode, the diversity receiving apparatus 100 controls the tuner unit 130 included in the diversity receiving apparatus 100 to extract one channel at the same time, The first demodulator 150 may output the first stream provided from the channel demodulation unit 150 included in the second demodulation unit 100. [ In addition, when the reception mode is the second mode, the diversity receiving apparatus 100 controls the tuner unit 130 to operate in a second mode for extracting two different channels at the same time, and the channel demodulation unit 150, It is possible to simultaneously output the first stream and the second stream that are different from each other.

For example, when the diversity receiving apparatus 100 is operated in the first mode, each of the first tuner 131 and the second tuner 133 extracts the same channel signal from the RF signal, And outputs the first stream. In this case, the stream output from the diversity receiving apparatus 100 is composed of a video stream for one broadcast channel.

On the other hand, when the diversity receiving apparatus 100 is operated in the second mode, the first tuner 131 and the second tuner 133 respectively extract channel signals different from each other from the RF signal, And outputs the first stream and the second stream. In this case, each of the first demodulator 151 and the second demodulator 153 operates in the master mode to output the first stream and the second stream for the different broadcast channels, respectively. Accordingly, the display device receiving the stream from the diversity receiving apparatus 100 can simultaneously display two broadcast channels on the screen through the PIP function or the like.

Thereafter, when the RF signal receiving sensitivity is changed (S270-Y), the diversity receiving apparatus 100 can determine the receiving mode (S210). That is, the diversity receiving apparatus 100 may be changed to the first mode or the second mode according to the reception sensitivity of the RF signal through the antenna unit 110 provided in the diversity receiving apparatus 100. In other words, the diversity receiving apparatus 100 can change the reception mode so as to operate in the second mode, which is the PIP mode, when the signal environment is improved during operation in the first mode, which is a diversity system mode because the signal environment is poor. Likewise, the diversity receiving apparatus 100 can change the reception mode so as to operate in the first mode, which is a diversity system mode, when the signal environment becomes worse during operation in the second mode which is a PIP mode because of a good signal environment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the appended claims.

100: diversity receiving apparatus, 110: antenna unit,
130: tuner unit, 150: channel demodulator unit,
170:

Claims (14)

An antenna unit having a first antenna and a second antenna;
A first tuner for receiving a first RF signal from the first antenna and extracting a first channel signal from the first RF signal and a second tuner for receiving a second RF signal from the second antenna, A tuner unit including a second tuner for extracting the second tuner;
A first demodulator for receiving the first channel signal from the first tuner and demodulating the first channel signal and a second demodulator for receiving the second channel signal from the second tuner and demodulating the second channel signal A channel demodulator including a second demodulator; And
Wherein the first tuner and the second tuner are controlled to operate in a first mode for extracting the same channel signal to output a first stream provided from the channel demodulator unit, And an output controller for controlling the first and second demodulators to operate in a second mode for extracting different channel signals and outputting different first and second streams respectively provided from the channel demodulator,
Wherein the output control unit determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the number of times that the RF signal reception sensitivity through the antenna unit is less than a preset reference reception sensitivity is more than a predetermined number of times for a predetermined period, And controls the first mode to operate in the second mode if the RF signal reception sensitivity through the antenna unit is greater than the reference reception sensitivity. delete The method according to claim 1,
Wherein the output controller determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the BER value is greater than a predetermined reference value and if the BER value is smaller than the reference value, Is greater than the reference reception sensitivity. delete The method according to claim 1,
Wherein the output control unit determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the SNR is less than a predetermined reference value and if the SNR value is greater than the reference value, And determines that the sensitivity is larger than the reference reception sensitivity. delete delete An antenna unit having a first antenna and a second antenna; A first tuner for receiving a first RF signal from the first antenna and extracting a first channel signal from the first RF signal and a second tuner for receiving a second RF signal from the second antenna, A tuner unit including a second tuner for extracting the second tuner; A first demodulator for receiving the first channel signal from the first tuner and demodulating the first channel signal and a second demodulator for receiving the second channel signal from the second tuner and demodulating the second channel signal, And a channel demodulator unit including a second demodulator for demodulating the received signal,
A first mode in which the first tuner and the second tuner extract the same channel signal according to the reception sensitivity of the RF signal through the antenna unit and a second mode in which the first tuner and the second tuner extract channel signals different from each other, Controlling to operate in one of the modes; And
And outputting a stream provided from the channel demodulator unit, the diversity reception method comprising:
The RF signal reception sensitivity is determined such that the RF signal reception sensitivity is less than the reference reception sensitivity if the number of times that the RF signal reception sensitivity through the antenna unit is less than a preset reference reception sensitivity is more than a predetermined number of times for a predetermined period And determines that the RF signal reception sensitivity through the antenna unit is greater than the reference reception sensitivity if the RF signal reception sensitivity through the antenna unit is greater than the reference reception sensitivity. delete 9. The method of claim 8,
Wherein the mode control step determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the BER value is greater than a preset reference value and if the BER value is smaller than the reference value, And determines that the sensitivity is larger than the reference reception sensitivity. delete 9. The method of claim 8,
Wherein the mode control step determines that the RF signal reception sensitivity is smaller than the reference reception sensitivity if the SNR is less than a preset reference value and if the SNR value is greater than the reference value, And determines that the reception sensitivity is larger than the reference reception sensitivity. delete delete
KR1020140020700A 2014-02-21 2014-02-21 Diversity receiving device and diversity receiving method thereof KR101577183B1 (en)

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KR1020140020700A KR101577183B1 (en) 2014-02-21 2014-02-21 Diversity receiving device and diversity receiving method thereof
PCT/KR2014/001962 WO2015125995A1 (en) 2014-02-21 2014-03-10 Diversity reception device and method

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Citations (1)

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Publication number Priority date Publication date Assignee Title
US20070011719A1 (en) * 2005-07-11 2007-01-11 Che-Li Lin Methods and apparatus for providing television signals

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Publication number Priority date Publication date Assignee Title
JP3632535B2 (en) * 1999-12-15 2005-03-23 日本電気株式会社 Diversity transmission / reception method and apparatus
US7376406B2 (en) * 2004-04-16 2008-05-20 Matsushita Electric Industrial Co., Ltd. Diversity reception apparatus
KR100993118B1 (en) * 2008-08-05 2010-11-08 에스케이 텔레콤주식회사 Base Transceiver Station System and Method Providing Diversity
US8170161B2 (en) * 2009-01-23 2012-05-01 Delphi Technologies, Inc. Hybrid switched-phased diversity system and method

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Publication number Priority date Publication date Assignee Title
US20070011719A1 (en) * 2005-07-11 2007-01-11 Che-Li Lin Methods and apparatus for providing television signals

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