KR101510756B1

KR101510756B1 - mixed mode signal environment based frequency reassign system

Info

Publication number: KR101510756B1
Application number: KR20140058269A
Authority: KR
Inventors: 김창; 강형창; 신정호; 문경윤; 조태현; 정진욱
Original assignee: (주)와이브로텍
Priority date: 2014-05-15
Filing date: 2014-05-15
Publication date: 2015-04-10
Also published as: WO2015174719A1

Abstract

The present invention relates to a method and apparatus for efficiently processing a mixed mode signal processed by a wireless repeater when a wireless repeater for forming a wireless link between a base station and a terminal processes a mixed mode signal in which a WCDMA signal and an LTE signal are mixed, The present invention relates to a mixed-mode signal-based frequency reordering system, and more particularly, to a system for frequency reordering based on a mixed-mode signal environment, the system comprising: an ADC for converting an analog signal into a digital signal; The digital signal converted by the ADC is divided into WCDMA, LTE, GSM, and CDMA. The ratio is calculated according to the shape of each signal with respect to the entire signal. An FPGA for rearranging the frequency to a CASE and generating a synchronization signal for differentiating a transmission / reception timing of a wireless communication link; And a DAC for converting the digital signal output from the FPGA into an analog signal.

Description

[0001] The present invention relates to a mixed mode signal environment based frequency reassigning system,

The present invention relates to a mixed-mode signal environment-based frequency reordering system, and more particularly, to a wireless relayer that forms a radio link between a base station and a terminal, when processing a mixed-mode signal in which a WCDMA signal and an LTE signal are mixed, The present invention relates to a mixed-mode signal-environment-based frequency reordering system that effectively processes a mixed-mode signal processed by a frequency modulator and processes the frequency reordering configuration with software flexibility.

According to Publication No. 10-2009-0113916 (Configuration of Repeater), "Methods and systems are provided for constructing a frequency repeater, which consists of the identity of the service provider and defines a set of frequencies to be relayed Which frequencies are associated with a service provider that matches a preconfigured identity The digital filter receives an incoming signal from the service provider and filters and relays the frequencies defined in the received message Also, The frequency receiver may determine a set of frequencies to be filtered and relayed based on a cell search procedure performed with the modem resident on the repeater. The policy established by the service provider may also include defining a set of symbols to be relayed The receiving and transmitting antennas used by the repeater < RTI ID = 0.0 > A set of frequencies to be filtered and relayed can be adapted in real time, by using a signal quality metric and a separation metric associated with the performance of the system. "

Publication No. 10-2009-0113916 (Configuration of Repeater)

In recent years, the data communication method of the mobile communication system rapidly evolved from the second generation (2G) to the third generation (3G) to the fourth generation (4G; LTE), and the data transmission amount performed by the mobile communication terminal is rapidly increasing, Data types and data composition ratios are also very diverse.

Such a change in the data communication amount can be achieved by improving the data communication speed. However, the configuration of the wireless repeater relaying the data communication also faces a need to be changed in order to improve the technology.

In particular, as shown in FIG. 1, in a circumstance where a mixed mode signal in which a signal configuration processed by a wireless repeater is a mixture of a WCDMA signal and an LTE signal is a main axis, the ratio of constituting the WCDMA signal and the LTE signal is greatly varied, There is an increasing need to quickly relocate frequencies to facilitate data processing.

Referring to FIG. 1, there is a case where only the WCDMA signal is configured as shown in (A), but there is a case where the signal is composed only of the LTE signal as shown in (F). In the current mobile communication environment, it is composed of WCDMA signal and LTE signal as shown in (B), (C), (D) and (E). These mixed mode signals are also easily biased by one signal, , Vary greatly from country to country.

Consider each case (CASE) where the frequency can be relocated using an analog SAW filter.

As shown in Fig. 2, the hatched hatched block is an LTE signal block, and the hatched hatched block is a WCDMA signal block. Analog IF requires a maximum of 3 paths and a minimum of 1 path, and a Saw Filter for each path requires 5/10/15/20. Therefore, maximum of 3 X 4 = 12 Saw Filters and Switches can be used. In this case, design can be made without difference in band width (BW) of CDMA / WCDMA and LTE.

As a wireless repeater for relaying such mixed mode signals, it is necessary to relocate the frequency appropriately according to the situation so that the problem of causing data congestion without using the resources of the wireless repeater properly can be prevented in advance.

Also, there is a need for a device that can solve this problem without adding hardware configuration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a wireless repeater which forms a radio link between a base station and a mobile terminal when a wireless repeater processes mixed mode signals in which a WCDMA signal and an LTE signal are mixed, The present invention provides a mixed-mode signal-environment-based frequency reordering system in which a signal is efficiently processed and a frequency reordering configuration is flexibly improved in software.

In order to accomplish the above object, the present invention is implemented as a mix mode signal environment based frequency relocation system of a wireless repeater forming a wireless communication link between a base station and a terminal. In order to freely implement the filter position or bandwidth according to service and bandwidth in the entire commercial band, the sampling frequency of the ADC is implemented at least twice as much as the service band, thereby making it possible to cope with both current and future moving frequencies.
A mixed-mode signal environment-based frequency reordering system of a wireless repeater forming a wireless communication link between a base station and a terminal, the system comprising: The wireless repeater of the system includes an ADC for converting an analog signal to a digital signal; The digital signal converted by the ADC is divided into WCDMA, LTE, GSM, and CDMA. The ratio is calculated according to the shape of each signal with respect to the entire signal. An FPGA for rearranging the frequency to a CASE and generating a synchronization signal for differentiating a transmission / reception timing of a wireless communication link; And a DAC for converting the digital signal output from the FPGA into an analog signal.

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In an embodiment, the FPGA includes a FIR filter.

In an embodiment, the unit of the frequency to be relocated is 5 MHz.

According to the preferred effect of the present invention, there is an advantage that 1) any case is fixed to an intermediate frequency (IF) 1 path, and therefore no additional hardware configuration is necessary; and 2) Dividing and combining are performed so that it can be applied automatically or manually to the case where it is suitable for the wireless situation (CASE), and 3) the wireless repeater is used as a data communication type of the mobile communication system, that is, WCDMA , LTE, GSM / CDMA, etc., can be designed considering the bandwidth (BW) of each service.

1 is a graph for explaining a mixed-mode signal environment;
FIG. 2 is a frequency relocation table for examining each case (CASE) when performing frequency relocation with a SAW analog filter in a mixed-mode signal environment.
3 is a frequency relocation table for describing each case (CASE) when performing frequency relocation with a FIR digital filter in a mixed-mode signal environment according to the present invention;
4 is a block diagram illustrating a main configuration of a frequency-based relocation system based on a mixed-mode signal environment according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a frequency reordering table for explaining each case (CASE) when performing frequency relocation in the FIR digital filter according to the present invention in a mixed-mode signal environment, and FIG. 4 is a diagram illustrating a frequency- 2 is a block diagram showing a main configuration of the system.

As shown in FIG. 4, in the wireless repeater 10 of the present invention, an ADC 11 and a DAC 13 are provided in order to facilitate frequency relocation. The ADC 11 and the DAC 13 convert an analog signal into a digital signal, Because.

That is, the wireless repeater 10 includes an ADC 11 for converting an analog signal into a digital signal; The form of the digital signal converted by the ADC 11 is divided into WCDMA, LTE, GSM, and CDMA. The ratio is calculated according to the shape of each signal with respect to the entire signal, and the calculated ratio An FPGA (12) for rearranging the frequency to a case (CASE) close to the wireless communication link and generating a synchronization signal for differentiating a transmission / reception timing of a wireless communication link; And a DAC 13 for converting the digital signal output from the FPGA into an analog signal.
In addition, the FPGA 12, in which the frequency reallocation is substantially performed, divides the digital signal converted by the ADC into WCDMA, LTE, GSM, and CDMA, calculates a ratio of each signal to the total signal, The frequency is rearranged to a case (CASE) which is close to the calculated ratio among the plurality of cases for rearranging the wireless communication link, and a synchronization signal for dividing the transmission / reception timing of the wireless communication link is generated.

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In the FPGA 12, an FIR filter is provided, which is a finite impulse response (FIR) filter. The FIR filter obtains an output signal by an input signal without returning the output.

The FIR filter is stable and has a linear phase, so it is not affected by the phase distortion. To use the FIR filter, a lot of filter coefficients are needed. In LTE 5/10/15/20, WCDMA 5/10/15 / And performs filtering by reloading 20 FIR filter coefficients (FIR filter coefficients).

In addition, the frequency reordering system of the present invention can provide a time division LTE service without an additional synchronization module. For reference, TD (Time Division) LTE is a method of dividing time in a data communication into sub- This is a method of transmitting a part of data by using a small amount of time. The method is an LTE method adopted by countries such as China and India in which uploading and downloading are performed with a time difference from one channel. On the other hand, the FD-LTE adopted by South Korea and the US operates the frequency channel of upload and download. In this case, Tx / Rx Enable / Disable signal for the transmission and reception timing is required for the TD-LTE, and a separate Sync Signal Generation Module is added for the analog repeater. However, in the case of a digital repeater according to the present invention, there is no additional cost since a sync signal is basically generated in the FPGA.

Referring to FIG. 3, a frequency reordering system according to an embodiment of the present invention has a bandwidth of 30 MHz, and the number of analog paths is different according to 25 cases.

In FIG. 3, the hatched portion is an LTE signal block and the non-hatched portion is a WCDMA signal block. Thus, since various combinations of signals are possible, even if variables such as a region, time, It is possible to directly set to the nearest case (CASE), and this setting also has an effect that can be set by software without adding or changing a hardware device.

10; A wireless repeater 11; ADC
12; FPGA 13; DAC

Claims

A mixed-mode signal environment-based frequency reordering system of a wireless repeater forming a wireless communication link between a base station and a terminal,
The wireless repeater includes an ADC for converting an analog signal into a digital signal;
The digital signal converted by the ADC is divided into WCDMA, LTE, GSM, and CDMA. The ratio is calculated according to the shape of each signal with respect to the entire signal. An FPGA for rearranging the frequency to a CASE and generating a synchronization signal for differentiating a transmission / reception timing of a wireless communication link;
And a DAC for converting the digital signal output from the FPGA into an analog signal.

The method according to claim 1,
Wherein the FPGA includes a FIR filter.

The method according to claim 1,
Wherein the unit of the frequency is 5 MHz.