KR101230491B1 - Repeater using improved wcdma uplink - Google Patents

Abstract

The present invention relates to a relay apparatus for improving uplink relay for a WCDMA, comprising: a matched filter for maximizing signal to noise ratio with respect to a WCDMA uplink input signal of a base station; A multi-level decision unit for down-sampling the signal received from the matched filter unit based on the synchronization signal to maximize the signal-to-noise ratio, and making soft decisions on multiple levels through quantization; A synchronization unit for generating a synchronization signal based on the WCDMA uplink input signal of the base station and providing the synchronization signal to the multilevel determination unit; And a pulse reshaping filter for up-sampling the signal received from the multilevel determination unit and reshaping it into pulses of a WCDMA system.

Description

Repeater with improved uplink relay for YCDMAA {REPEATER USING IMPROVED WCDMA UPLINK}

The present invention relates to a repeater which improves uplink relay for a PCMA. The relay apparatus includes a matching filter unit, a multilevel determination unit, a synchronizer, and a pulse reshaping filter unit to significantly improve the output SNR compared to the input SNR. The present invention relates to a relay apparatus which has improved uplink relay for WCDMA.

In the conventional relay apparatus for uplink for WCDMA, it only has a function of amplifying, and has a limitation on a part for improving the output SNR compared to the input SNR.

Accordingly, an object of the present invention is to propose a relay apparatus which improves uplink relay for WCDMA, which can significantly improve output SNR compared to input SNR.

In addition, it is an object of the present invention to propose a relay apparatus for improving uplink relay for a PCMA that can process not only a single FA uplink input signal but also multiple FA uplink input signals.

In order to achieve the above object, the present invention provides a matched filter unit (10) for maximizing the signal to noise ratio for the WCDMA uplink input signal of the base station; Multi-level decision (20) to down-sample the signal received from the matched filter unit to maximize the signal-to-noise ratio based on the synchronization signal, and to make a soft decision on the multi-level through quantization ; A synchronization unit (30) for generating a synchronization signal based on the WCDMA uplink input signal of the base station and providing the synchronization signal to the multilevel determination unit; And a pulse reshaping filter 40 which upsamples the signal received from the multilevel determination unit and re-forms the WCDMA-type pulse into a pulse of the WCDMA system. Provide a relay device.

In this case, the matched filter unit is a first RC filter 15.

The multilevel determiner may include a down sampler 23 for down sampling a signal input from the matched filter unit, and a quantizer 27 for quantizing the signal received from the down sampler. do.

The pulse reshaping filter unit may further include an up sampler 43 for up-sampling the signal input from the multilevel determination unit, and a second step of reshaping the signal input from the up sampler into pulses of a WCDMA method. 2 RF filter 47 is included.

The sync unit also includes a searcher 33 for coarse chip syncronization and a tracker 37 for fine chip syncronization.

In addition, the relay device may process a single FA uplink input signal as well as process multiple FA uplink input signals.

In this case, the relay device includes: a multi-FA channelizer 50 for receiving a WCDMA uplink input signal of a base station and channelizing the multi-FA uplink input signal into basebands for each FA; And a plurality of matched filter units, a multilevel determination unit, a synchronizer, and a pulse reshaping filter unit for receiving and processing a signal corresponding to its own FA from the multiple FA channelizer. And a multiple FA inverse channelizer 60 for generating multiple FA uplink signals by integrating baseband signals for each FA received from the pulse reshaping filter units.

In addition, the multi-FA channelization unit, a frequency down-conversion (53) for frequency down-conversion to the baseband and the decimation & channel filtering unit (decimation & channel filtering) for reducing the amount of sampling data (57) ).

In addition, the multi-FA de-channelization unit, the interpolation unit (63) and the frequency up-conversion unit (frequency up-conversion) (67) to generate a multi-FA uplink signal by integrating the baseband signal for each FA ).

As described above, the present invention includes the matching filter unit 10, the multilevel determination unit 20, the synchronization unit 30, and the pulse reshaping filter unit 40, thereby significantly improving the output SNR compared to the input SNR. It is possible to provide a relay apparatus which can improve uplink relay for WCDMA.

In addition, it is possible to provide a relay apparatus that improves the uplink relay for WCDMA capable of processing not only a single FA uplink input signal but also multiple FA uplink input signals.

1 is a process schematic diagram of a first embodiment of the present invention assuming the case of a single FA uplink input signal,
FIG. 2 illustrates the matched filter unit 10 of FIG. 1.
FIG. 3 illustrates the multilevel determination unit 20 of FIG. 1.
4 shows the pulse reshaping filter unit 40 of FIG.
5 illustrates the synchronization unit 30 of FIG. 1,
6 is a process schematic diagram of a second embodiment of the present invention, assuming the case of a multiple FA uplink input signal;
FIG. 7 illustrates the multiple FA channelizer 50 of FIG. 6.
FIG. 8 illustrates the multiple FA dechannelization unit 60 of FIG. 6.
9 is a graph showing an output SNR simulation result with respect to white noise.
10 is a graph illustrating a comparison result of a noise floor comparison when no signal is provided.
11 is a comparison table of EVM (64-fold spreading case) for white noise channel SNR.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in this specification and claims should not be construed in a common or dictionary sense, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. Based on the principle that it can, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

(Embodiment 1)

1 is a process schematic diagram of a first embodiment of the present invention assuming a single FA uplink input signal, FIG. 2 shows the matched filter unit 10 of FIG. 1, and FIG. 3 shows the multilevel determination of FIG. 4 shows the pulse reshaping filter part 40 of FIG. 1, and FIG. 5 shows the synchronization part 30 of FIG.

As shown in FIG. 1, the relay apparatus for improving uplink relay for WCDMA according to the first embodiment of the present invention includes a matched filter unit 10; A multi-level decision 20; A synchronization 30; And a pulse reshaping filter 40.

Here, the matched filter 10 is a filter that maximizes the signal-to-noise ratio for the WCDMA uplink input signal of the base station. The matched filter unit 10 includes a first Root Raised Cosine (RRC) filter.

More specifically, a matched filter that can be used in the matched filter portion is a linear filter designed to maximize the signal-to-noise power ratio of the output for a given transmitted symbol waveform, the impulse response of which is delayed by the signal duration (T). It becomes a mirror image of the input signal s (t). In other words, the impulse response h (t) of the matched filter is s (T-t).

이다. The RPC filter, also called a square-root-raised-cosine filter (SRRC), is frequently used as a transmission and reception filter in a digital communication system and is a filter for performing matched filtering. The frequency response Hrrc (f) of the grain filter is the square root of the frequency response Hrc (f) of the raised-cosine filter. In other words,

to be.

Next, the multilevel determination unit 20 down-samples the signal received from the matching filter unit 10 to maximize the signal-to-noise ratio based on the synchronization signal input from the synchronization unit 30, and quantizes the signal. Soft decision on multiple levels through. That is, the multilevel determiner 20 down-sampler 23 downsamples the signal input from the matched filter unit and a quantizer quantizes the signal received from the down sampler 23. (27).

At this time, when quantizing, various levels are set for each user, and a soft decision is made to quantize signals in the corresponding area for each level into one. Here, the soft decision or soft decision is in contrast to a hard decision or hard decision that quantizes or decodes two levels to 0 and 1, and means that the number of quantization levels is greater than two.

Next, the synchronization unit 30 generates a synchronization signal based on the WCDMA uplink input signal of the base station, and provides the synchronization signal to the multilevel determination unit 20. In other words, the optimal point is detected by the WCDMA chip synchronization process so that downsampling can be performed at the point where the signal-to-noise ratio is the highest during the multilevel decision process in the multilevel determiner.

Here, the synchronizer 30 may include a searcher for coarse chip syncronization and a tracker for fine chip syncronization.

In addition, the pulse reshaping filter 40 up-samples the signal received from the multilevel determination unit and reshapes it into a WCDMA pulse.

Here, the pulse reshaping filter unit 40 WCDMA the up sampler 43 and the up sampler 43 that up-sample the signal received from the multilevel determination unit 20. The second RF filter 47 may be implemented by shaping the pulse of the method.

(Second Embodiment)

FIG. 6 is a processing schematic diagram of a second embodiment of the present invention, assuming a case of a multiple FA uplink input signal, FIG. 7 shows the multiple FA channelization unit 50 of FIG. 6, and FIG. The FA dechannelization unit 60 is shown.

Since the second embodiment differs only in terms of multiple FAs, not a single FA, compared to the first embodiment, a part different from the relay device according to the first embodiment with respect to the relay device according to the second embodiment. This will be described mainly.

The relay apparatus according to the second embodiment includes a multiple FA channelizer 50; And a plurality of matching filter units, multilevel determination units, synchronization units, and pulse reshaping filter units for each FA, as described in the first embodiment, for receiving and processing signals corresponding to the own FAs from the multiple FA channelization unit. ; And a multiple FA dechannelization unit 60.

Here, the multi-FA channelization unit 50 is a component that channelizes each FA into basebands for the multiple FA uplink input signals. A frequency down-conversion 53 and a decimation & channel filtering 57 for reducing the amount of sampling data.

Next, the multi-FA inverse channelization unit 60 generates a multi-FA uplink signal by integrating baseband signals for each FA received from the pulse reshaping filter units. In addition, the multi-FA de-channelization unit, the interpolation unit (63) and the frequency up-conversion unit (frequency up-conversion) (67) to generate a multi-FA uplink signal by integrating the baseband signal for each FA ). The interpolation unit 63 interpolates (interpolates) the trusted samples (samples) in the neighbor, thereby concealing unreliable data or inserting the unreliable samples in place.

Through such a configuration, the relay apparatus according to the present invention can process not only a single FA uplink input signal but also multiple FA uplink input signals.

(Simulation result)

9 is a graph showing the output SNR simulation results compared to the input SNR for the white noise, Figure 10 is a graph showing the simulation results of the noise layer comparison in the no signal, Figure 11 is the EVM (64 times diffusion case for the white noise channel SNR) ) Is a comparison table. In FIG. 10, red is a proposed device according to the present invention, and blue is a conventional relay device.

As shown in Figs. 9 and 10, the proposed device according to the present invention includes a conventional filter, that is, a matched filter 10, such as the present invention; A multi-level decision 20; A synchronization 30; And when compared with the repeater without the pulse reshaping filter (pulse reshaping filter 40), it can be seen that the output SNR is sharply improved when the input SNR is 10dB or more.

Likewise, as can be seen in the table in FIG. 11, it can be seen that the relay device according to the present invention is considerably improved in terms of EVM (%) compared with the conventional relay device.

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. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

10 matched filter
15 1st RC filter
20 multi-level decision
23 down sampler
27 Quantizer
30 synchronization
33 Searcher
37 tracker
40 pulse reshaping filter
43 up sampler
47 second grain filter
50 multiple FA channelizers
53 frequency down-conversion
57 decimation & channel filtering
60 multiple FA dechannelization
63 interpolation
67 frequency up-conversion

Claims (9)

A matched filter for maximizing a signal-to-noise ratio for the WCDMA uplink input signal of the base station;
A multi-level decision unit for down-sampling the signal received from the matched filter unit based on the synchronization signal to maximize the signal-to-noise ratio, and making soft decisions on multiple levels through quantization;
A synchronization unit for generating a synchronization signal based on the WCDMA uplink input signal of the base station and providing the synchronization signal to the multilevel determination unit; And
And a pulse reshaping filter for up-sampling the signal received from the multilevel determination unit and reshaping it into pulses of a WCDMA method.
Process multiple FA uplink input signals,
A multi-FA channelization unit for receiving a WCDMA uplink input signal of a base station and channelizing the multi-FA uplink input signal into basebands for each FA;
A plurality of matched filter units, a multilevel determination unit, a synchronizer, and a pulse reshaping filter unit for receiving and processing a signal corresponding to its own FA from the multiple FA channelizer;
The FA re-channel relay further comprises a; multiple FA de-channelization unit for generating a multi-FA uplink signal by integrating the baseband signal for each FA received from the pulse reshaping filter unit Repeater. The method of claim 1,
And the matching filter unit is a first RC filter. The method of claim 2,
The multilevel determination unit includes a down sampler for downsampling the signal input from the matched filter unit and a quantizer for quantizing the signal received from the down sampler. Relay device with improved uplink relay. The method of claim 3, wherein
The pulse reshaping filter unit may include an upsampler for up-sampling a signal input from the multilevel determination unit and a second RC filter for reshaping the signal received from the up-sampler into pulses of a WCDMA method. The relay apparatus which improved the uplink relay for WCDMA which comprises the. The method of claim 4, wherein
The synchronization unit includes a searcher for coarse chip syncronization and a tracker for fine chip syncronization, wherein the relay for improving uplink relay for WCDMA is improved. Device. delete delete The method of claim 5, wherein
The multi-FA channelization unit includes a frequency down-conversion unit for frequency down-conversion to baseband and a decimation & channel filtering unit for reducing the amount of sampling data. Relay apparatus which improves uplink relay for WCDMA. The method of claim 8,
The multi-FA dechannelization unit includes an interpolation unit and a frequency up-conversion unit to generate a multi-FA uplink signal by integrating baseband signals of respective FAs. Relay apparatus which improves uplink relay for WCDMA.

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