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Wireless receiving device and method for reducing received noise by utilizing diversity antenna

A technology of wireless receiving device and diversity antenna, applied in diversity/multi-antenna system, space transmit diversity, polarization/direction diversity and other directions, can solve the problem of not reducing the internal and surrounding radiation noise of the terminal, and not improving the C/N, High cost and other problems, to achieve the effect of improving receiving sensitivity, reducing radiation noise, and reducing costs

Inactive Publication Date: 2011-08-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the antenna selection method is only to find the signal with the best C / N received by the diversity antenna, and the C / N of the signal cannot be further improved on this basis.
In addition, MRC technology requires at least two demodulation units equal to the number of diversity antennas. Although it can improve the quality of signal reception, the cost is very expensive.
In addition, these two methods cannot reduce the radiation noise generated inside and around the terminal

Method used

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  • Wireless receiving device and method for reducing received noise by utilizing diversity antenna
  • Wireless receiving device and method for reducing received noise by utilizing diversity antenna
  • Wireless receiving device and method for reducing received noise by utilizing diversity antenna

Examples

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Embodiment approach 1

[0023] figure 2 is a block diagram of a radio receiving apparatus for reducing reception noise using diversity antennas according to the first embodiment of the present invention. Refer below figure 2 The configuration and operation of a wireless receiving apparatus for reducing reception noise using diversity antennas according to the first embodiment of the present invention will be described.

[0024] Such as figure 2 As shown, according to the first embodiment of the present invention, the wireless receiving device utilizing a diversity antenna to reduce reception noise includes a diversity antenna 200, a switch unit 203, a direct circuit 205, an amplitude and phase adjustment circuit 206, a signal synthesis unit 207, and a C / N calculation unit 209 and control unit 210. The control unit 210 is connected to the switch unit 203 and the amplitude and phase adjustment circuit 206 through the line 204 for controlling the switch unit 203 and the amplitude and phase adjustm...

Embodiment approach 2

[0038] In Embodiment 1 above, the first embodiment of the wireless receiving device of the present invention for reducing reception noise by using a diversity antenna is described by taking the example that the diversity antenna includes two antenna units.

[0039] As the size of mobile terminals becomes smaller and thinner, there is no room for two antenna units in many mobile terminals. Embodiment 2, that is, the second embodiment, describes a wireless receiving device that uses only one antenna unit to achieve diversity reception through phase processing.

[0040] Figure 5 An embodiment is shown in which a diversity antenna receiving device is implemented using one antenna unit. Such as Figure 5 As shown, the antenna unit 501 is composed of an antenna element 502 and an antenna element 503 . Each of the branches of the two antenna elements is connected with a phase shifter, the phase shifters in the two branches of the antenna element 502 are +90 degree phase shifters ...

Embodiment approach 3

[0046] In the first embodiment described above, it is necessary to evaluate the C / N of the signals received by the antenna unit 201 and the antenna unit 202 respectively through switching of the switch unit 203 first. If the switching speed is too slow, in order to prevent the switching of the switch from causing the received signal to be intermittent, once the signal with a relatively good C / N and the signal with a relatively poor one are determined, this premise will be defaulted until the C / N cannot reach the threshold. However, for places where the signal reception environment is harsh, such as large multipath interference and weak signals, if the receiving status such as the orientation of the mobile terminal is often changed, it needs to be executed multiple times. image 3 The process shown will affect the receiving effect. To solve this problem, Figure 7 A diversity antenna wireless receiving device according to a third embodiment of the present invention is shown. ...

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Abstract

The invention discloses a wireless receiving device for reducing received noise by utilizing a diversity antenna. The wireless receiving device comprises a diversity antenna, a switching unit, a through circuit, an amplitude and phase adjustment circuit, a signal synthesis unit, a C / N (Carrier-to-Noise Ratio) calculation unit and a control unit, wherein the diversity antenna is used for receiving wireless signals; the switching unit is used for respectively providing two paths of wireless signals received by the diversity antenna for the through circuit and the amplitude and phase adjustment circuit under the control of a control unit; one path of wireless signal received by the diversity antenna originally passes through the through circuit; the amplitude and phase adjustment circuit adjusts the amplitude and / or the phase of the other path of wireless signal received by the diversity antenna; the signal synthesis unit is used for synthesizing the wireless signal output by the through circuit and the wireless signal output by the amplitude and phase adjustment circuit; the C / N calculation unit calculates the C / N values of the wireless signals synthesized by the synthesis unit; and the control unit controls operation executed by the switching unit and the amplitude and phase adjustment circuit.

Description

technical field [0001] The invention relates to a wireless receiving device and method for reducing receiving noise by using diversity antennas. In particular, it relates to differences in the carrier-to-noise ratio (carrier-to-noise ratio: C / N) of signals received by diversity antennas. By making the noise cancel each other out, the useful signal power is not reduced while canceling out the noise part, and the signal is improved. Carrier-to-noise ratio, thereby improving the effect of receiving sensitivity. Background technique [0002] In order to improve the transmission efficiency of television broadcasting, the transmitting antenna of general television broadcasting uses either vertical polarization or horizontal polarization. For plain areas with few occluders, in order to increase the coverage area of ​​TV broadcasting, the transmitting antenna of general TV broadcasting mostly adopts the horizontal polarization mode. However, for mountainous areas and cities with m...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/10H04B1/16H04B1/10H04B7/08
Inventor 李楠
Owner PANASONIC CORP
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