Apparatus for controlling sensitivity by using digital gating in receiver and receiver with the same
a technology of sensitivity control and receiver, applied in the field of wireless communication system, can solve the problems of difficult linear control of noise figures of specific circuits, unsatisfactory interference signals, and sensitive set of sensitivity together with exact transmission power, so as to achieve easy matching with remaining structural elements, size and cost of the ask receiver for dsr
Active Publication Date: 2015-07-21
INTELLECTUAL DISCOVERY CO LTD
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Benefits of technology
The solution enables easy control of sensitivity without degrading system performance, reduces the size and cost of the DSRC receiver, and allows for seamless integration with GPS or DMB chips, improving communication efficiency and reducing manufacturing costs.
Problems solved by technology
As a part of multiplexing technology, the use of an SDM means that an undesirable interference signal may be generated from an adjacent ETCS cell.
Further, in order to clearly define a communication area within a wide temperature variation range, a very delicate set of the sensitivity is required together with exact transmission power.
However, disadvantages of such a control method are as follows.
Because a system noise figure of the receiver is determined as a function of gains and noise figures of all the structural circuits, it is significantly difficult to linearly control a noise figure of a specific circuit by controlling a gain or the noise figure of the specific circuit.
Moreover, since the BER obtained with a maximum system performance index in a minimum input power, is obtained by artificially degrading a performance of a system when the sensitivity is set to a great value, a system of an optimal performance may be not obtained, and it is difficult to define a clear communication distance.
Meanwhile, since a conventional base station for DSRC is configured by a hybrid module configuration of high manufacturing cost and cost burden, it is implemented in a number of construction chips and external components.
This causes the occurrence of a cost burden.
The base station for DSRC implemented in a hybrid module configuration has a disadvantage that it may not be integrated with chips such as GPS or DMB.
The reason why is that since an IF frequency of the conventional ASK receiver for DSRC reception is a high frequency of approximately 40 MHz, a surface acoustic wave (SAW) is used as the IF filter, and since a size of a filter processing a high IF frequency is large, the IF filter may not be integrated in the ASK receiver chipset.
In the ASK receiver for DSRC reception having a high IF frequency, since the IF filter is positioned in an outside of the ASK receiver chipset, it is difficult to match the ASK receiver chipset and the IF filter with each other.
Moreover, a size of the ASK receiver is increased, thereby increasing a cost.
Method used
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[0048]Hereinafter, exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings. The same reference numerals are used throughout the drawings to refer to the same or like parts. Detailed descriptions of well-known functions and structures incorporated herein may be omitted to avoid obscuring the subject matter of the present invention.
[0049]FIG. 1 is a view showing a receiver 100 in accordance with an embodiment of the present invention.
[0050]The receiver 100 includes a low noise amplifier (LNA) 104, a mixer 106, a frequency synthesizer 108, a bandpass filter 110, a log amplifier 112, a detector 114, a switch 116, and a switch controller 120.
[0051]The LNA 104 amplifies a received radio frequency (RF) signal while minimizing amplification of noise included in the received RF signal. The amplified signal from the LNA 104 is input to the mixer 106. The mixer 106 down-converts a frequency of the amplified RF signal from the LNA 104 a...
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Disclosed is a wireless communication system, more particularly, a receiver and a chipset for DSRC. A receiver includes: a low noise amplifier (LNA) amplifying a received radio (RF) signal while minimizing amplification of noise included in the received RF signal; a mixer down-converting a frequency of an output signal of the LNA to output an intermediate frequency (IF) signal; a frequency synthesizer generating and outputting a frequency signal for the frequency-down conversion of the mixer to the mixer; a bandpass filter passing a necessary band of a channel in an output signal of the mixer; a log amplifier amplifying an output signal of the bandpass filter in log scale and outputting a received signal strength indicator of an output signal of the bandpass filter; a detector comparing an output of the log amplifier with a predetermined binary threshold value, outputting a first binary signal when the output of the log amplifier is less than the predetermined binary threshold value, and outputting a second binary signal when the output of the log amplifier is equal to or greater than the predetermined binary threshold value; a switch serially connected with an output terminal of the detector; and a switch controller comparing the received signal strength indicator of the output signal of the log amplifier with an RSSI threshold, opening the switch when the received signal strength indicator is less than the RSSI threshold, and closing the switch when the received signal strength indicator is equal to or grater than the RSSI threshold.
Description
CROSS-REFERENCE TO RELATED APPLICATIONCROSS REFERENCE TO RELATED APPLICATION(S)[0001]The present application is a Reissue Application from U.S. Pat. No. 8,270,538 issued on Sep. 18, 2012 and filed May 18, 2009, which claims priority under 35 U.S.C. §119(a) to Korean Patent Application Nos. 10-2008-0058656 filed on Jun. 20, 2008 and 10-2008-0058657 filed on Jun. 20, 2008, the disclosuredisclosures of which isare hereby incorporated by reference in its entirety as if set forth fully herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a wireless communication system, more particularly, to a receiver and a chipset for dedicated short range communication (DSRC).[0004]2. Description of the Related Art[0005]DSRC is dedicated short range communication. The DSRC denotes a communication manner and protocol that performs local communication without long distance interference based on an industrial / scientific / medical (ISM) band and several fre...
Claims
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IPC IPC(8): H03D1/24H04B1/28
CPCH04L25/06H04B1/28
InventorSHIN, SANGHOCHO, SANG-HYUNYUN, SEOK-OHKIM, JONG-MOON
OwnerINTELLECTUAL DISCOVERY CO LTD