CN110896312A - Device and method for executing bandwidth detection - Google Patents
Device and method for executing bandwidth detection Download PDFInfo
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- CN110896312A CN110896312A CN201811062774.1A CN201811062774A CN110896312A CN 110896312 A CN110896312 A CN 110896312A CN 201811062774 A CN201811062774 A CN 201811062774A CN 110896312 A CN110896312 A CN 110896312A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
The invention relates to a device and a method for executing bandwidth detection. The bandwidth detection device comprises a receiving circuit for receiving a plurality of frequency domain signals on a first subchannel; a filter circuit, coupled to the receiver circuit, for converting the first plurality of frequency domain signals into a first plurality of filtered frequency domain signals according to a filter function; and a processing circuit, coupled to the filter circuit, for comparing the first plurality of frequency domain signals with the first plurality of filtered frequency domain signals to determine whether the first subchannel includes first transmitted data.
Description
Technical Field
The present invention relates to a communication apparatus and method for a communication system, and more particularly, to an apparatus and method for performing bandwidth detection.
Background
In a communication system, when it is not known on which sub-channels a transmitting end transmits signals, a receiving end performs Bandwidth Detection (Bandwidth Detection) to obtain Bandwidth information. After obtaining the bandwidth information, the receiving end can process the signal in advance, thereby improving the signal quality and enhancing the performance. Generally, the receiving end performs bandwidth detection using Correlation (Correlation) operation or Matched Filter (Matched Filter). However, in an environment with a low signal-to-noise ratio (SNR) or a high interference (high interference), it is difficult for the correlation operation or the matched filter to obtain high-accuracy bandwidth information. Therefore, how to obtain more accurate bandwidth information under the environment with low snr or high interference becomes an urgent issue to be solved.
Disclosure of Invention
The present invention provides a method and a communication device thereof for performing bandwidth detection to solve the above problems.
The invention discloses a frequency width detection device, which comprises a receiving circuit, a frequency-domain signal generating circuit and a frequency-domain signal generating circuit, wherein the receiving circuit is used for receiving a first plurality of frequency-domain signals (frequency-domain signals) on a first subchannel; a filter circuit, coupled to the receiving circuit, for converting the first plurality of frequency domain signals into a first plurality of filtered frequency-domain signals according to a filter function (filter function); and a processing circuit, coupled to the filter circuit, for comparing the first plurality of frequency domain signals with the first plurality of filtered frequency domain signals to determine whether the first subchannel includes first transmitted data.
Drawings
Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a receiving device according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a bandwidth detection apparatus according to an embodiment of the invention.
FIG. 4 is a flowchart of an embodiment of a process.
FIG. 5 is a diagram of a simulation result according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a diagram of a communication system 10 according to an embodiment of the invention. The communication system 10 may be any communication system using Orthogonal Frequency Division Multiplexing (OFDM) technology (or DMT technology), and is briefly composed of a transmitting end TX and a receiving end RX. In fig. 1, a transmitting terminal TX and a receiving terminal RX are used to illustrate the architecture of the communication system 10. For example, the communication system 10 may be an Asymmetric Digital Subscriber Line (ADSL) system, a Power Line Communication (PLC) system, an ethernet coax (EOC) system, or other wired communication systems. Alternatively, the communication system 10 may be a wireless communication system such as a local area network (WLAN), a Digital Video Broadcasting (DVB) system, a Long Term Evolution (LTE) system, an LTE-advanced (LTE-a) system, and a fifth generation (5th generation, 5G) system. In addition, the transmitting terminal TX and the receiving terminal RX may be disposed in a mobile phone, a notebook computer, etc., but are not limited thereto.
Fig. 2 is a schematic diagram of a receiving apparatus 20 according to an embodiment of the present invention, which is used in the receiving end RX of fig. 1 for processing a signal transmitted by the transmitting end TX. The receiving device 20 includes a conversion device 200, a compensation device 210, a processing device 220 and an equalizer 230. In detail, after the receiving apparatus 20 receives the plurality of time domain signals sig _ time, the converting apparatus 200 converts the plurality of time domain signals sig _ time into a plurality of frequency domain signals sig _ freq, wherein the plurality of frequency domain signals sig _ freq are transmitted on a plurality of subchannels. The compensation device 210 is coupled to the conversion device 200 and configured to perform time compensation and/or frequency compensation on the plurality of frequency domain signals sig _ freq to generate a plurality of compensation signals sig _ comp. The processing device 220 is coupled to the compensation device 210, and is configured to generate a plurality of channel frequency responses sig _ cfr and a plurality of bandwidth detection results BW _ det according to the plurality of compensation signals sig _ comp. The equalizer 230 is coupled to the compensation device 210 and the processing device 220, and configured to perform an equalization (equalization) operation on the plurality of compensation signals sig _ comp according to the plurality of channel frequency responses sig _ cfr and the plurality of bandwidth detection results BW _ det, so as to generate a plurality of equalized signals sig _ eq.
In one embodiment, the processing device 220 may include a channel estimation device 222 and a bandwidth detection device 224. The channel estimation device 222 is configured to generate a plurality of channel frequency responses sig _ cfr according to the plurality of compensation signals sig _ comp. The bandwidth detection apparatus 224 is coupled to the channel estimation apparatus 222, and is configured to generate a plurality of bandwidth detection results BW _ det according to the plurality of channel frequency responses sig _ cfr.
In one embodiment, a plurality of time domain signals sig _ time are included in at least one packet. In one embodiment, at least one packet includes a Legacy Preamble and a non-Legacy Preamble. In one embodiment, the Legacy preamble signal includes a Legacy Short Training Field (L-STF), a Legacy Long Training Field (L-LTF), and a Legacy Signal Field (L-SIG). In one embodiment, the non-legacy preamble is a High Throughput preamble (High Throughput Signal Field) that includes a High Throughput Signal Field. In one embodiment, the non-legacy Preamble is a Very High Throughput Preamble (Very High Throughput Preamble) comprising a Very High Throughput Signal Field A (Very High Throughput Signal Field A). In one embodiment, the non-legacy Preamble is a High Efficiency Preamble (High Efficiency Signal Field) comprising a High Efficiency Signal Field B. In one embodiment, the high throughput signal field, the ultra high throughput signal field A and the high efficiency signal field B comprise bandwidth information. In the prior art, the receiving end RX knows which sub-channels of the plurality of sub-channels the transmission data is transmitted in according to the bandwidth information contained in the high throughput signal field, the ultra high throughput signal field a, or the high efficiency signal field B. According to the present invention, by performing bandwidth detection to generate a plurality of bandwidth detection results BW _ det, the receiving device 20 can know in advance which sub-channels of the plurality of sub-channels the transmitted data is transmitted. That is, the first time point (time instant) of the multiple bandwidth detection results BW _ det generated by the present invention is earlier than the second time point of the prior art for obtaining the bandwidth information. In an embodiment, the plurality of time domain signals sig _ time are conventional long training fields.
Fig. 3 is a schematic diagram of a bandwidth detection apparatus 30 according to an embodiment of the invention. The bandwidth detection apparatus 30 can be used to realize the bandwidth detection apparatus 224 in fig. 2, but is not limited thereto. The bandwidth detection apparatus 30 may include a receiving circuit 300, a filter circuit 310 and a processing circuit 320. The receive circuit 300 may be configured to receive a first plurality of channel frequency responses sig _ cfr1 on a first sub-channel. The first plurality of channel frequency responses sig _ cfr1 are contained in the plurality of channel frequency responses sig _ cfr. The filter circuit 310 is coupled to the receiving circuit 300 and configured to convert the first plurality of channel frequency responses sig _ cfr1 into a first plurality of filtered channel frequency responses sig _ cfr _ filt1 according to a filter function (filter function). The processing circuit 320 is coupled to the filter circuit 310 and configured to compare the first plurality of channel frequency responses sig _ cfr1 with the first plurality of filtered channel frequency responses sig _ cfr _ filt1 to determine whether the first sub-channel includes the first transmitted data. According to the determination, the processing circuit 320 generates a first bandwidth detection result BW _ det1 of the first sub-channel. The first bandwidth detection result BW _ det1 is included in the plurality of bandwidth detection results BW _ det.
In one embodiment, the receive circuit 300 receives a second plurality of channel frequency responses sig _ cfr2 on a second sub-channel. The second plurality of channel frequency responses sig _ cfr2 are contained in the plurality of channel frequency responses sig _ cfr. The filter circuit converts the second plurality of channel frequency responses sig _ cfr2 into a second plurality of filtered channel frequency responses sig _ cfr _ filt2 according to a filter function. The processing circuit 320 compares the second plurality of channel frequency responses sig _ cfr2 and the second plurality of filtered channel frequency responses sig _ cfr _ filt2 to determine whether the second sub-channel contains second transmitted data. According to the determination, the processing circuit 320 generates a second bandwidth detection result BW _ det2 of the second sub-channel. The second bandwidth detection result BW _ det2 is included in the plurality of bandwidth detection results BW _ det.
In one embodiment, the processing circuit 320 determines that the first sub-channel includes a plurality of time domain signals sig _ time when a ratio of a total energy level (level) of the first plurality of cfr1 and a total energy level of the first plurality of filtered cfr filt1 is not greater than a threshold (threshold). In an embodiment, when the ratio is greater than the threshold value, the processing circuit 320 determines that the first sub-channel does not include the plurality of time domain signals sig _ time.
In one embodiment, the first plurality of channel frequency responses sig _ cfr1 are located in a conventional short training field, a conventional long training field, or a conventional signal field. In one embodiment, the first subchannel occupies a bandwidth (bandwidth). In one embodiment, the first plurality of channel frequency responses sig _ cfr1 includes channel estimates (channels) for the first subchannel. In one embodiment, the second plurality of channel frequency responses sig _ cfr2 includes a plurality of channel estimates for the second sub-channel.
In one embodiment, the filter function is a normal smoothing filter function or an exponential smoothing filter function. In one embodiment, the filter function is a third order filter function. In one embodiment, the filter function is uncorrelated with a signal-to-noise ratio (SNR). For example, the coefficients of the filter function may be coefficients having a signal-to-noise ratio below 60 decibels (dB), such as 40 dB or 0 dB. In one embodiment, all coefficients of the filter function are real numbers. Therefore, the filter circuit 310 can reduce the complexity and power of the operation.
The following embodiments are provided to illustrate how to determine which sub-channels of a plurality of sub-channels to transmit data. First, the conventional long training field includes two identical sets of time-domain transmission sequences L in the time domain1And L2And the receiving device 20 correspondingly receives the time domain receiving sequence
And
(i.e., a plurality of time domain signals sig _ time). The conversion device 200 receives the sequence r in the time domain1And r2Respectively converted into frequency domain receiving sequences
And
(i.e., the plurality of frequency domain signals sig _ freq) is as follows:
where M is the index (index) of the subchannel, M is 0,1, …, M-1, and M is the number of subchannels. In one embodiment, taking a local wireless network system as an example, the total bandwidth is 160MHz, and can be divided into 8 subchannels of 20MHz (i.e., M-8). In one embodiment, 1 ≦ M ≦ 8. Then, the compensation device 210 receives the sequence in the frequency domain
And
after compensation, the channel estimation device 222 performs channel estimation on the frequency domain received sequence
And
taking an average value to obtain an average sequence
According to the average sequence
Channel estimation device 222 generates a channel frequency response
(e.g., the first plurality of channel frequency responses sig _ cfr1 or the second plurality of channel frequency responses sig _ cfr 2):
where K is an index of the subcarriers, K is 0,1, …, K-1, and K is the number of subcarriers. In one embodiment, K is 52. In addition to this, the present invention is,
is a time domain transmission sequence L1Or L2The result is converted into a frequency domain sequence. Channel frequency response
Is a Least Squares (LS) solution. According to channel frequency response
Bandwidth detection device 224 (or bandwidth detection device 30) generates a filtered channel frequency response
(e.g., first plurality of filtered channel frequency responses sig _ cfr _ filt1 or second plurality of filtered channel frequency responses sig _ cfr _ filt 2):
wherein G islIs the coefficient of the filter function and L is the number of coefficients. The filter function is a smoothing filter function. Next, the bandwidth detection device 224 calculates the channel frequency response
And filtering channel frequency response
Total energy level of
And
the following were used:
if the total energy level
And
when the ratio is greater than the threshold value THD, the bandwidth detection device 224 determines that the subchannel with the index m does not contain the time domain receiving sequence
And
as described in (equation 8):
the operation of the bandwidth detection apparatus 30 can be summarized as a process 40 for the bandwidth detection apparatus 224, as shown in fig. 4. The process 40 includes the following steps:
step 400: and starting.
Step 402: a first plurality of frequency-domain signals (frequencies) on a first subchannel are received.
Step 404: the first plurality of frequency domain signals is converted into a first plurality of filtered frequency-domain signals according to a filter function (filter function).
Step 406: comparing the first plurality of frequency domain signals with the first plurality of filtered frequency domain signals to determine whether the first subchannel includes first transmitted data.
Step 408: and (6) ending.
The process 40 is used to exemplify the operation manner of the bandwidth detection apparatus 30, and the detailed description and the variations can be referred to the above, which is not described herein.
FIG. 5 is a diagram of a simulation result according to an embodiment of the present invention. The simulation environment is set as a local wireless network system, the channel is an Additive White Gaussian Noise (AWGN) channel, and the number of transmission antennas is 1. In fig. 5, the vertical axis represents the error rate, and the horizontal axis represents the signal-to-noise ratio. Fig. 5 compares two approaches at error rate: correlation operations (prior art) and smoothing filters (present invention). The filter functions used in the present invention are normal smoothing filter functions and third order filter functions. As can be seen from FIG. 5, in the case that the SNR is in the range of-2 dB to 1 dB, the error rate of the present invention is lower than that of the prior art. Therefore, the invention can provide better efficiency.
It should be noted that the implementation of the receiving apparatus 20 (and the converting apparatus 200, the compensating apparatus 210, the processing apparatus 220 and the equalizer 230 therein) can be varied. For example, the above-described devices may be integrated into one or more devices. In addition, the receiving device 20 can be implemented by hardware (e.g., a circuit), software, firmware (a combination of hardware and computer instructions and data belonging to read-only software on the hardware), an electronic system, or a combination thereof, but is not limited thereto.
In summary, the present invention provides an apparatus and method for performing bandwidth detection, which can determine whether a sub-channel includes transmission data according to an input signal and an output signal of a filter circuit, so as to obtain bandwidth information in advance, process signals in advance, and effectively improve signal quality and performance. Under the environment of low signal to noise ratio or high interference, more accurate bandwidth information is obtained.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.
Description of the symbols
20 receiving device
200 switching device
210 compensating device
220 processing device
222 channel estimation device
224. 30 bandwidth detection device
230 equalizer
sig _ time multiple time domain signals
sig _ freq multiple frequency domain signals
sig _ comp compensation signal
sig _ cfr multiple channel frequency response
BW _ det multi-bandwidth detection result
sig _ eq multiple equalized signals
300 receiving circuit
310 filter circuit
320 processing circuit
sig _ cfr1 first multiple channel frequency response
sig _ cfr _ filt1 first plurality of filtered channel frequency responses
BW _ det1 first bandwidth detection result.
Claims (10)
1. A bandwidth detection device includes:
a receiving circuit for receiving a first plurality of frequency domain signals on a first subchannel;
a filter circuit, coupled to the receiver circuit, for converting the first plurality of frequency domain signals into a first plurality of filtered frequency domain signals according to a filter function; and
a processing circuit, coupled to the filter circuit, for comparing the first plurality of frequency domain signals with the first plurality of filtered frequency domain signals to determine whether the first subchannel includes first transmitted data.
2. The bandwidth detection apparatus of claim 1, wherein the bandwidth detection apparatus performs the following operations:
the receiving circuit receives a second plurality of frequency domain signals on a second subchannel;
the filter circuit converts the second plurality of frequency domain signals to a second plurality of filtered frequency domain signals according to the filter function; and
the processing circuit compares the second plurality of frequency domain signals with the second plurality of filtered frequency domain signals to determine whether the second subchannel includes second transmitted data.
3. The bandwidth detection apparatus according to claim 1, wherein the processing circuit determines that the first sub-channel contains the first transmitted data when a ratio of a total energy level of the first plurality of frequency domain signals to a total energy level of the first plurality of filtered frequency domain signals is not greater than a threshold, and determines that the first sub-channel does not contain the first transmitted data when the ratio is greater than the threshold.
4. The bandwidth detection apparatus of claim 1, wherein the first plurality of frequency domain signals are located in a legacy short training field, a legacy long training field or a legacy signal field.
5. The bandwidth detection apparatus of claim 1, wherein the first plurality of frequency domain signals comprises a plurality of channel estimates of the first sub-channel, and the first sub-channel occupies a bandwidth.
6. The bandwidth detection device of claim 1, wherein said filter function is a normal smoothing filter function or an exponential smoothing filter function.
7. The bandwidth detection device of claim 1, wherein the filter function is a third order filter function and the filter function is uncorrelated with a signal to noise ratio.
8. The bandwidth detection apparatus of claim 1, wherein all coefficients of the filter function are real.
9. The bandwidth detecting apparatus according to claim 1, wherein a first time point of determining whether the first sub-channel contains the first transmitted data is earlier than a second time point of obtaining the bandwidth information, and the bandwidth information is contained in a high throughput signal field, an ultra high throughput signal field a or a high efficiency signal field B.
10. The bandwidth detecting device as claimed in claim 9, wherein the high throughput signal field, the ultra high throughput signal field A and the high efficiency signal field B are respectively included in a high throughput preamble, an ultra high throughput preamble and a high efficiency preamble.
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