CN116388784A - Wireless communication method, wireless receiving device, and non-transitory computer storage medium - Google Patents

Abstract

The present application relates to a wireless communication method, a wireless receiving apparatus, and a non-transitory computer storage medium. The wireless communication method comprises the following steps: receiving, with two receiving antennas, two signals including a first signal and a second signal from a transmitting device having at least two transmitting antennas; performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals; and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals. The method and the device not only avoid huge resource waste caused by configuring the receiving device with a plurality of antennas to receive signals by only one antenna, but also can save computing resources and reduce power consumption while improving the quality of received signals and the sensitivity of a receiver.

Description

Wireless communication method, wireless receiving device, and non-transitory computer storage medium

Technical Field

The present invention relates to the field of wireless communication technology, and in particular, to a wireless communication method, a wireless receiving apparatus, and a non-transitory computer storage medium.

Background

With the rapid development of wireless communication technology, serious shortfalls in spectrum resources have increasingly become a "bottleneck" for the development of wireless communication industry. How to fully develop and utilize limited spectrum resources and improve spectrum utilization rate is one of the hottest subjects of the communication world research in recent years. Multi-antenna technology is widely favored because it can improve transmission efficiency and spectrum utilization without increasing bandwidth. Meanwhile, due to the fact that the multipath effect and the Doppler effect exist in the wireless channel environment, deep fading can be caused, the receiving performance is seriously affected, and the diversity technology in the multi-antenna system can utilize the characteristic that the probability that different paths which are completely independent or approximately independent are simultaneously affected by the deep fading is smaller than the probability that only one path is affected by the deep fading, the receiving end performs combination processing on the received signals from different paths, and therefore the receiving signal quality is improved, and the sensitivity of a receiver is improved.

IEEE802.11B is a second generation wireless local area network protocol standard that was introduced by the american society of motor electronics engineers (IEEE) to improve upon its originally introduced wireless standard IEEE 802.11. The bandwidth of the IEEE802.11B wireless local area network can reach 11Mbps at most, which is 5 times faster than the IEEE802.11 standard just approved two years ago, thereby expanding the application field of the wireless local area network. In addition, when the radio frequency situation becomes worse, bandwidths of 5.5Mbps, 2Mbps, and 1Mbps can be adopted according to practical situations. As a facility inside a company, the use requirements can be basically satisfied. IEEE802.11B uses the open 2.4GB band and is usable without application. The method can be used as a supplement to a wired network and can also be used for independently networking, so that network users get rid of the constraint of network cables, and the mobile application in the true sense is realized. IEEE802.11B has the following advantages: dynamic rate conversion can be achieved; the communication range supported is 300 meters outdoors and up to 100 meters in an office environment; using a connection protocol and packet acknowledgement similar to ethernet to provide reliable data transfer and efficient use of network bandwidth; the network interface card can be switched to a sleep mode, and the access point buffers information to the client, so that the battery life of the wireless terminal conforming to the wireless communication standard is prolonged; allowing seamless connection between access points, etc., as the user moves between stories or corporate departments. The wireless local area network of IEEE802.11B introduces a collision avoidance technology, thereby avoiding the occurrence of collision in the network and greatly improving the network efficiency.

Because of the above advantages, IEEE 802.11B has been widely used in consumer wireless communication devices, but there is no multi-antenna reception method and wireless reception device applicable to IEEE 802.11B. Specifically, starting from WIFI 11B, the base station and the terminal may configure multiple antennas simultaneously. However, even if the terminal has the capability of being configured with more than one antenna, most terminals in WIFI 11B implementations only use one antenna to receive signals, or only select one antenna to receive a first-stream signal for processing. This not only wastes resources, but also provides poor reception in noisy communication environments.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a wireless communication method, a wireless receiving apparatus, and a non-transitory computer storage medium, which are executed by a receiving apparatus equipped with at least two receiving antennas, are capable of receiving signals with at least two antennas instead of a single antenna at the receiving apparatus, and are applicable to IEEE 802.11B wireless communication standards, and solve a problem that when multi-antenna signals transmitted from a transmitting end are combined at the receiving end in IEEE 802.11B multi-antenna mode, the quality of the combined signals is deteriorated due to interference cancellation between the signals.

According to a first aspect of the present application, there is provided a wireless communication method performed by a receiving apparatus equipped with at least two receiving antennas, including: receiving, with two receiving antennas, two signals including a first signal and a second signal from a transmitting device having at least two transmitting antennas; performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals; and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals.

According to a second aspect of the present application, there is provided a wireless receiving apparatus including: at least two receive antennas, wherein the two receive antennas are configured to receive two signals including a first signal and a second signal from a transmitting device having at least two transmit antennas; and a processing unit configured to: acquiring two paths of signals received by the two receiving antennas from a transmitting device with two transmitting antennas; performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals; and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals.

According to a third aspect of the present application, there is provided a non-transitory computer storage medium having stored thereon executable instructions that, when executed by a wireless receiving apparatus equipped with at least two receiving antennas, enable implementation of a wireless communication method according to various embodiments of the present application.

According to the wireless communication method, the wireless receiving device and the non-transitory computer storage medium, aiming at the problem that the quality of the combined signal is poor due to interference cancellation between signals when the multi-antenna signal transmitted by the transmitting end is combined at the receiving end in the 802.11B multi-antenna mode, from the aspect of adjusting the processing mode of the multi-antenna receiving signal by the receiving end, the synchronous deviation of the two paths of signals obtained by timing synchronous processing of the two paths of signals received by the receiving end is used as a criterion for selecting the processing mode of the multi-antenna receiving signal, and according to the judging result of whether the synchronous deviation of the two paths of signals exceeds a reasonable range, whether one path of the two paths of signals is selected for processing or the two paths of signals are combined for obtaining a final signal is determined, so that the signal quality of the final signal is superior to that of a single path of the two paths of signals, and huge resource waste caused by configuring the receiving end of the plurality of antennas to only use one antenna for receiving the signals is avoided, and the computing resource is saved while the receiving quality of the signals is improved and the sensitivity of a receiver is improved.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.

Fig. 1 is a simplified block diagram of a wireless transceiver.

Fig. 2 is a flow chart of signal processing in the physical layer (PHY layer) when a wireless transceiver transmits a signal.

Fig. 3 is a schematic diagram of a data frame format of a PHY layer defined in 802.11B.

Fig. 4 shows a flow chart of a wireless communication method according to an embodiment of the present application.

Fig. 5 shows a flow chart of a wireless communication method according to another specific embodiment of the present application.

Fig. 6 shows a comparison of a reception effect of receiving a signal using 1 antenna in the related art with a wireless communication method according to an embodiment of the present application.

Fig. 7 shows a schematic diagram of a wireless receiving device according to an embodiment of the present application.

Detailed Description

In order to better understand the technical solutions of the present application, the following detailed description of the present application is provided with reference to the accompanying drawings and the specific embodiments. Embodiments of the present application will now be described in further detail with reference to the accompanying drawings and specific examples, but are not intended to be limiting of the present application.

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. The order in which the steps of the methods described in the present application with reference to the accompanying drawings are performed is not intended to be limiting. As long as the logical relationship between the steps is not affected, several steps may be integrated into a single step, the single step may be decomposed into multiple steps, or the execution order of the steps may be exchanged according to specific requirements.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

Fig. 1 is a simplified block diagram of a wireless transceiver. As shown in fig. 1, the wireless transceiver includes a PHY layer processing unit (not shown) and a Medium Access Control (MAC) layer processing unit. The PHY layer processing unit comprises a baseband receiving unit, a baseband transmitting unit, a radio frequency receiving unit and a radio frequency transmitting unit.

When the wireless transceiver transmits signals, firstly, the MAC layer processing unit transmits information to the PHY layer processing unit, and the signals are transmitted out from an antenna port in the form of electromagnetic waves after being processed by the baseband transmitting unit and the radio frequency transmitting unit in the PHY layer processing unit. When the wireless transceiver receives signals, the signals received from the antenna are processed by the radio frequency receiving unit and the baseband receiving unit in the PHY layer processing unit, and then the information is reported to the MAC layer processing unit.

Fig. 2 is a flow chart of signal processing in the PHY layer when a wireless transceiver transmits signals. As shown in fig. 2, the signal processing procedure in the PHY layer when the wireless transceiver transmits a signal specifically includes the following steps.

Framing: the data to be transmitted is first divided into suitable blocks, and the necessary header information and check code are added to form a data packet. The PHY layer data frame format defined in IEEE 802.11B will be described in detail below with reference to fig. 3.

Scrambling: in order to prevent the SYNC domain and other domains in a frame of data from generating long-sequence '1' or '0', scrambling codes must be performed before modulation, so that the frequency spectrum of a transmitted signal is more stable, the performance of a transmission channel is improved, and the acquisition of timing synchronization information is facilitated.

Modulation and spreading: IEEE 802.11B simultaneously supports four modulation rates of 1M bit/s, 2M bit/s, 5.5M bit/s and 11M bit/s respectively. The first two methods adopt Differential Binary Phase Shift Keying (DBPSK) + Direct Sequence Spread Spectrum (DSSS) and Differential Quadrature Phase Shift Keying (DQPSK) + DSSS modulation modes; the latter two employ Complementary Code Keying (CCK) modulation schemes. And spreading the modulated signal to improve the anti-interference capability of the signal.

Sampling and filtering: the signal is sampled and the sampled signal is filtered to eliminate noise, frequency aliasing and other problems introduced by the sampling and to transform to a rate suitable for information transmission.

Digital-to-analog conversion (DAC): the digital signal is converted to an analog signal for transmission in the antenna.

Delay time: in order to use multiple antennas for diversity and combining, a certain delay D and phase rotation between the antennas needs to be introduced. Thus, when the same signal is transmitted through different antennas, different delays and phase changes exist, so that the diversity of the signal is increased. Fig. 2 shows a case where the wireless transceiver uses 2 antennas for signal transmission, where two exponential functions Exp (je 1) and Exp (je 1) respectively represent initial phase offsets of two signals after delay D and respective phase rotations.

And (3) antenna transmission: signals are transmitted through different antennas to improve transmission rate and reliability using multipath transmission.

Fig. 3 is a schematic diagram of a data frame format of a PHY layer defined in IEEE 802.11B.

IEEE 802.11B defines two different frame formats, namely, a long preamble frame with a synchronization code (SYNC) of 128 bits and a short preamble frame with a SYNC of 56 bits, according to the PLCP sublayer.

SYNC is a "1" of 128 bits/56 bits after scrambling, which is used to wake up the receiving device to synchronize with the received signal.

Following the SYNC is a 16bit Start Frame Delimiter (SFD) that when received, indicates that the next PLCP Header (PLCP Header) will also be sent.

After the Preamble (PLCP Preamble) is finished, PLCP header information is included in the information, and the physical parameters related to data transmission are included in the information. These parameters include: signaling (SIGNAL), traffic (SERVICE), LENGTH of data to be transmitted (LENGTH), and a 16-bit CRC check code. The receiver will adjust the reception rate, select the decoding mode, decide when to end the data reception according to these parameters. The SIGNAL field is 8 bits long, which is used to define the data transfer rate, and has four values: 0Ah, 14h, 37h and 6Eh, respectively specify transmission rates of 1Mbps, 2Mbps, 5.5Mbps and 11Mbps, and the receiver will adjust its own reception rate accordingly. The SERVICE field is also 8 bits in length, which specifies what modulation code (CCK or PBCC) to use. The LENGTH field is 16 bits long to indicate how long (in microseconds) it takes to send the following PSDU. The 16-bit CRC check code is used to check whether the received signaling, traffic and length fields are correct.

The PLCP Header is followed by a MAC Protocol DATA Unit (MPDU) that includes a DATA (DATA) field containing the actual DATA transmitted, the length of which is variable.

Fig. 4 shows a flow chart of a wireless communication method according to an embodiment of the present application. The wireless communication method is performed by a receiving apparatus equipped with at least two receiving antennas. The receiving device operates in an IEEE 802.11B wireless local area network standard defining a multi-antenna transceiving mode. As shown in fig. 4, the method includes the following steps.

In step S401, two signals including a first signal and a second signal from a transmitting device having at least two transmitting antennas are received using two receiving antennas. In the 802.11B multi-antenna mode, the input signal received by a receiving device equipped with at least two receiving antennas is a two-way signal that becomes 22Mhz in bandwidth after sample rate conversion, interpolation, and gain adjustment.

In step S402, timing synchronization processing is performed on the two signals to obtain synchronization deviations of the two signals. Because the two paths of signals are received by the two receiving antennas in the receiving device in sequence, a certain delay D exists between the two paths of signals, and the two paths of signals are subjected to timing synchronization processing to obtain the synchronization deviation of the two paths of signals.

In step S403, the two signals are selected or combined according to the synchronization deviation of the two signals to obtain a final signal, where the signal quality of the final signal is better than that of the single signal with poorer signal quality in the two signals.

According to the wireless communication method executed by the receiving device provided with at least two receiving antennas, by utilizing the two receiving antennas to receive two paths of signals from the transmitting device with at least two transmitting antennas, resource waste caused by processing of receiving signals by only one of the antennas or selecting one path of signals received by only one of the antennas even if the receiving terminal has the capability of being configured with more than one antenna in the prior art is avoided.

In addition, by performing timing synchronization processing on the two signals received to obtain synchronization deviation of the two signals, and then determining whether to select one of the two signals to process or to combine the two signals to obtain a final signal according to the synchronization deviation of the two signals, the problems that the quality of the received signal is poor, or the same signal is not simultaneously transmitted by two transmitting antennas of the transmitting device, or at least one of the two signals is not an ieee802.11b signal, interference generated after the two signals are combined and processed is cancelled, so that performance is deteriorated, the waste of calculation resources and the power consumption are increased can be solved, and the sensitivity of the receiving device can be improved.

In some embodiments, timing synchronization of two signals specifically includes correlation using the SYNC signal and a local barker correlator. For example only, correlating with a local barker code correlator using a SYNC signal may include the following specific processing: at the receiving end, a reference signal may be generated using a local barker code, and then the received two signals are compared with the reference signal, so as to obtain the similarity between them. For example, the processing procedure of the correlation operation may be specifically: the two received signals after synchronization are respectively a signal a and a signal b. A set of digital signals c of the same length are generated from the local barker code. And carrying out correlation operation on the signals a and b and the signal c to obtain correlation coefficients r1 and r2 and correlation positions t1 and t 2. After r1 and r2 are both greater than the correlation threshold, t1 and t2 are compared, and if their difference is less than a predetermined threshold, the two signals are time aligned accordingly for subsequent processing. It should be noted that, this synchronization method needs to ensure that the local barker code is completely consistent with the barker code of the transmitting end, and the received signal cannot have serious noise or distortion, otherwise, the accuracy and reliability of synchronization are affected.

In some embodiments, selecting or combining the two signals to obtain the final signal according to the synchronization deviation of the two signals specifically includes: under the condition that the synchronous deviation exceeds a reasonable range, selecting a single-path signal with good signal quality from two paths of signals as the final signal; and under the condition that the synchronous deviation is in a reasonable range, combining the two paths of signals to obtain the final signal.

According to the embodiment, according to the judging result of whether the synchronization deviation of the two paths of signals exceeds a reasonable range, whether one path of the two paths of signals is selected for processing or the two paths of signals are combined for processing is determined to obtain a final signal. By identifying a situation in which the synchronization deviation is out of a reasonable range, in this case, one signal has poor quality, or is not the same signal transmitted simultaneously by two transmitting antennas of the transmitting device, or is not an IEEE 802.11B signal, the quality of the final signal may be degraded by considering alone or in combination. In this case, a single signal with good signal quality of the two signals is selected as the final signal, and the signal with poor signal quality is not considered in a separate or combined manner, for example, so that the quality of the final signal can be improved. Further, by identifying the situation that the synchronization deviation is in a reasonable range, the quality of the two paths of signals is good and the synchronization difference is reasonable, and combining and considering the two paths of signals in the final signal, parts with certain defects of the independent signals can be mutually compensated, and the two paths of signals are combined to obtain the final signal, so that the quality of the final signal can be improved. Therefore, under any of the above conditions, the signal quality of the obtained final signal can be better than that of a single signal with poorer signal quality in two paths of signals, so that not only is huge resource waste caused by configuring a receiving end of a plurality of antennas to receive signals by only one antenna avoided, but also the quality of the received signal can be improved, the sensitivity of the receiver is improved, and meanwhile, the computing resource is saved and the power consumption is reduced.

In some embodiments, whether the synchronization bias is out of a reasonable range is determined according to whether equation (1) below holds:

[ Index1-Index 2| > TH equation (1)

Wherein Index1 is the timing position of the first path of signal output by the barker correlator, index2 is the timing position of the second path of signal output by the barker correlator, and TH is the first threshold. As can be seen from the formula (1), the synchronization deviation in this embodiment may be an absolute value of a difference between the timing position of the first path signal and the timing position of the second path signal output by the barker code correlator.

Further, the first threshold TH may be a value predetermined according to a delay between two received signals and a use environment of the receiving apparatus. For example, the delay D existing between the two signals is generally around 200 ns, and according to t=s/v, assuming that the two signals are delayed by 10m during transmission, s=33 ns, the first threshold TH may take any value from 233 ns to 1 μs. In addition, the value of the first threshold TH is also related to the specific use environment of the receiving device. By way of example only, if the receiving apparatus is used outdoors, since the space is relatively wide, there are fewer objects blocking signal transmission, and therefore, the first threshold TH may be set to a smaller value than in the case where the receiving apparatus is indoors. The first threshold TH may also be set in other manners, which the present application is not limited to.

In some embodiments, in the case where the formula (1) is not satisfied, that is, when the synchronization deviation of the two signals does not exceed a reasonable range, the following processing is performed first, and then the two signals are combined:

firstly, synchronous position alignment processing is carried out on two paths of signals, so that the two paths of signals are aligned in time, and subsequent processing is facilitated.

And then, performing frequency offset compensation processing on the two paths of signals with the aligned synchronous positions. The specific procedure of the frequency offset compensation process will be described in detail later.

And then, respectively performing DSSS despreading processing or quick Walsh conversion processing on the corresponding signals after the frequency offset compensation processing according to the information analyzed by the PLCP Header frames of the signals in the two paths. Whether DSSS despreading or fast walsh transform is selected based on information in the PLCP Header frame depends on the particular communication requirements and spectrum utilization of the data frame. DSSS is a wireless communication technology that mathematically spreads raw data over a larger frequency band, thereby increasing the security and fault tolerance of communications. If the information in the PLCP Header frame indicates that the data frame is transmitted using the DSSS method, DSSS despreading may be selected to process the data frame. The fast walsh transform is a mathematical method that computes the frequency domain representation of a signal over a constant time. If the information in the PLCP Header frame indicates that the data frame is transmitted using frequency domain processing techniques, a fast walsh transform may be selected to process the data frame.

And finally, carrying out phase offset compensation processing and decision feedback equalization processing on two paths of signals after DSSS despreading processing or fast Walsh conversion processing. The specific procedures of the phase offset compensation process and the decision feedback equalization process will be described in detail later.

In this embodiment, the signal combining step is placed after the steps of despreading, frequency offset compensation, phase offset compensation, and the like, because the effect of signal combining is limited by the accuracy of frequency offset and phase offset estimation. If the combination is performed before the steps of despreading, frequency offset compensation, phase offset compensation and the like, the signal to noise ratio is reduced sharply after the combination, and a high-quality combined signal cannot be obtained.

In some embodiments, the phase offset compensation process and the frequency offset compensation process for the two signals are performed by using a phase-locked loop through symbol decision. Specifically, in this patent, a Phase Locked Loop (PLL) uses a symbol decision method to estimate the residual phase offset of each signal from the time T0 by using constellation demapping and symbol decision results, and performs despreading on each signal and then performs compensation in real time. Then, the frequency offset of each signal is estimated at the following time T1 by utilizing the relation of the frequency offset and the phase offset, and pre-compensation is performed before despreading each signal at the following time T2. Thus, after tracking for a period of time T, the frequency offset and the phase offset of the two signals can be corrected respectively. In addition, the bit stream output by using the symbol decision can be used as known information, and after remodulation, the equalization processing is performed by using a Decision Feedback Equalization (DFE) filter, so that the link reliability can be further improved.

In some embodiments, in the case where the formula (1) is not established, the two signals subjected to the phase offset compensation processing and the frequency offset compensation processing may be subjected to the combining processing by directly adding the two signals, or the two signals subjected to the phase offset compensation processing and the frequency offset compensation processing may be subjected to the combining processing by respectively weighting and summing based on the respective gain factors.

Under the condition that the synchronization deviation of the two paths of signals does not exceed a reasonable range, it can be determined that the two paths of signals received by the two antennas of the receiving device are the same signals transmitted by the two transmitting antennas of the transmitting device at the same time under IEEE 802.11B, and the signal quality of the two paths of signals is good. Therefore, after synchronous position alignment processing, frequency offset compensation processing, DSSS despreading processing or fast Walsh conversion processing, phase offset compensation processing and decision feedback equalization processing are performed on the two paths of signals, the two paths of signals after processing are combined, so that the combined signals can obtain higher combining gain, the quality of the received signals can be obviously improved, and the sensitivity of a receiving device is improved.

In some embodiments, in the case where the formula (1) is satisfied, that is, the synchronization deviation of the two signals is beyond a reasonable range, it may be determined that the signal quality of at least one of the two received signals is poor, or the same signal that is not simultaneously transmitted by two transmitting antennas of the transmitting device, or at least one of the two signals is not an IEEE 802.11B signal. In this case, only one signal with better signal quality of the two signals is selected for analysis processing, and the two signals are not combined, so that performance degradation caused by interference generated after the two signals are combined can be avoided, and excessive occupation of computing resources of a receiving device, increase of power consumption and the like can be avoided.

In this embodiment, one signal with better signal quality of the two signals may be selected based on the result of the correlation operation, that is, one signal with a larger absolute value of the result of the correlation operation may be selected. In addition, other selection criteria may be adopted, for example, a signal with a higher signal energy may be selected, and so on. The present application is not limited in this regard.

According to the wireless communication method executed by the receiving device provided with at least two receiving antennas, aiming at the problem that the quality of the combined signal is poor due to the fact that interference among signals is eliminated when the multi-antenna signals are combined at the receiving end in the 802.11B multi-antenna mode, from the aspect of adjusting the processing mode of the multi-antenna signals received by the receiving end, the synchronous deviation obtained by carrying out timing synchronous processing on two paths of received signals is used as a standard for adjusting the processing mode of the multi-antenna received signals, and according to the judging result of whether the synchronous deviation of the two paths of signals exceeds a reasonable range, whether one path of the two paths of signals is processed or the two paths of signals are combined is determined to obtain a final signal, so that the signal quality of the final signal is superior to that of a single path of signal with poorer signal quality in the two paths of signals, and huge resource waste caused by the fact that the receiving end provided with multiple antennas is used for receiving the signals only can be avoided, the sensitivity of the receiving end of the receiver can be improved, computing resources can be saved, and power consumption can be reduced.

Fig. 5 is a flow chart illustrating a method of wireless communication according to another specific embodiment of the present application.

In step S501, two signals including a first signal and a second signal are received from a transmitting device having at least two transmitting antennas using two receiving antennas. In 802.11B multi-antenna mode, the received input signal is a two-way signal that has been sample rate converted, interpolated, and gain adjusted to become 22Mhz in bandwidth.

In step S502, correlation is performed on the two signals using the SYNC signal and the local barker code, so as to obtain timing positions Index1 and Index2 of the two signals output by the barker code correlator. Where Index1 is the timing position of the first path signal and Index2 is the timing position of the second path signal.

In step S503, it is determined whether the expression |index 1-Index 2| > TH is satisfied, and whether the synchronization deviation of the two signals is out of a reasonable range is determined.

If the determination at step S503 is yes, at step S504, one of the two signals having a better signal quality is selected for analysis. In this case, it may be determined that the signal quality of at least one of the received two signals is poor, or the same signal that is not simultaneously transmitted by the two transmitting antennas of the transmitting apparatus, or that the at least one of the two signals is not an IEEE 802.11B signal. Therefore, only one signal with better signal quality in the two signals is selected for analysis processing, and the two signals are not combined. Therefore, the performance degradation caused by interference generated after the two paths of signals are combined can be avoided, and meanwhile, the excessive occupation of the computing resource of a receiving device, the increase of power consumption and the like are avoided.

If the determination at step S503 is no, at step S505, synchronization alignment is performed on the two signals. In this case, the synchronization deviation of the two signals does not exceed a reasonable range, it can be determined that the two signals received by the two antennas of the receiving apparatus are the same signal simultaneously transmitted by the two transmitting antennas of the transmitting apparatus under IEEE 802.11B and the signal quality of the two signals is good, and thus, the final signal can be obtained by combining the two signals.

Because of the time delay of the signals received by the two antennas, they need to be time synchronized for the combining process. For example, synchronization position alignment may be achieved by channel estimation and time synchronization algorithms. Wherein the channel estimate may utilize known transmit symbols and received signals to calculate channel parameters; the time synchronization algorithm may use the synchronization signal and pilot symbols to calculate a time offset of the received signal from the local clock.

In addition, because the effect of signal combination is limited by the accuracy of frequency offset and phase offset estimation, if the combination is performed before the steps of despreading, frequency offset and phase offset compensation, etc., the signal-to-noise ratio is reduced sharply after the combination, and a high-quality combined signal cannot be obtained. Therefore, the processing in steps S505 to S508 needs to be performed before the merging processing is performed.

Step S506: and carrying out frequency offset compensation processing on the two paths of signals with the aligned synchronous positions.

Step S507: and performing DSSS despreading processing or fast Walsh conversion processing on each path of signal after the frequency offset compensation processing. After the synchronization position is aligned, despreading processing of the spreading code is required for the received signal to restore the original signal. This step may be implemented by a DSSS despreading process or a fast walsh transform process. Wherein the DSSS despreading process restores the original signal by multiplying the received signal with a spreading code and integrating the result; the fast walsh transform process restores the original signal by multiplying the received signal with a fast walsh transform matrix. And selecting whether to perform DSSS despreading or quick Walsh conversion on the corresponding signals after the frequency offset compensation processing according to the information analyzed by the PLCP Header frame of each path of data.

Step S508: and carrying out phase offset compensation processing and decision feedback equalization processing on the two paths of signals after DSSS despreading processing or fast Walsh conversion processing.

The phase offset compensation process and the frequency offset compensation process for the two paths of signals can be performed by using a phase-locked loop through a symbol decision mode, and the specific processing procedure of the phase-locked loop is described in detail above and will not be described herein.

After the phase offset compensation process and the frequency offset compensation process, decision feedback equalization process is required to further eliminate interference and distortion between the received signals. The decision feedback equalization process may be implemented by comparing the correlation between the received signal and the signal after the symbol has been subjected to the remodulation spread spectrum.

Step S509: and combining the two paths of signals. For example, the two signals subjected to the phase offset compensation processing and the frequency offset compensation processing may be subjected to the combining processing by directly adding the two signals, or the two signals subjected to the phase offset compensation processing and the frequency offset compensation processing may be subjected to the combining processing by respectively weighting and summing the two signals based on the respective gain factors. In addition, other methods may be used to combine the two signals, which is not limited in this application.

According to the wireless communication method of the embodiment, when a receiving device equipped with at least two receiving antennas adopts an 802.11B multi-antenna mode to communicate with a transmitting device with at least two transmitting antennas, on the premise that the advantages of adopting multi-antenna simultaneous transmission to acquire larger signal gain, wider coverage range and the like are maintained, multiple paths of identical information transmitted simultaneously by the plurality of antennas of the transmitting end are received by adopting the plurality of antennas at the receiving end, one of the multiple paths of signals is selected to process or one of the multiple paths of signals is combined according to the synchronous deviation of the received multiple paths of signals to obtain a final signal, so that not only is the resource waste caused by the fact that the receiving end equipped with the multiple antennas only uses one of the multiple antennas to receive the signals avoided, but also the computing resource is saved and the power consumption is reduced while the quality of the received signal is improved and the sensitivity of the receiver is improved.

Fig. 6 is a diagram showing a comparison of a reception effect of receiving a signal using 1 antenna using the wireless communication method according to the embodiment of the present application with that of the related art.

In fig. 6, the line with o indicates that when receiving a single channel signal with a length of 1024 bytes and a symbol rate of 11Mbps, receiving 1000 packets of 802.11B signal by using 1 antenna, and when the signal-to-noise ratio (SNR) is greater than about 5.5db, the packet error rate can be within 10%. The line with x indicates that the method provided by the invention receives two paths of signals by using 2 antennas under the same condition, and when the SNR is more than about 2.5db, the packet error rate can be within 10%. Therefore, the wireless communication method provided by the invention can obtain 3db gain compared with the prior art that the signal is received by using 1 antenna.

There is also provided in accordance with an embodiment of the present application, as shown in fig. 7, a wireless receiving apparatus including at least two receiving antennas 701, wherein the two receiving antennas are configured to receive two signals including a first signal and a second signal from a transmitting apparatus having at least two transmitting antennas; and a processing unit 702 configured to: acquiring two paths of signals received by two receiving antennas from a transmitting device with two transmitting antennas; performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals; and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals.

In some embodiments, the wireless receiving device may further include a memory 703 having stored thereon computer-executable instructions that, when executed, the processing unit 702 performs various operations of the wireless communication method according to embodiments of the present application.

In some embodiments, the processing unit 702 may be, for example, a processing component including one or more general-purpose processors, such as a microprocessor, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), or the like. More specifically, the processing component may be a Complex Instruction Set Computing (CISC) microprocessor, a Reduced Instruction Set Computing (RISC) microprocessor, a Very Long Instruction Word (VLIW) microprocessor, a processor running other instruction sets, or a processor running a combination of instruction sets. The processing component may also be one or more special purpose processing devices such as an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), a system on a chip (SoC), or the like.

Memory 703 may be a non-transitory computer-readable medium such as read-only memory (ROM), random-access memory (RAM), phase-change random-access memory (PRAM), static random-access memory (SRAM), dynamic random-access memory (DRAM), electrically erasable programmable read-only memory (EEPROM), other types of random-access memory (RAM), flash memory disks or other forms of flash memory, buffers, registers, static memory, compact disc read-only memory (CD-ROM), digital Versatile Discs (DVD) or other optical memory, magnetic cassettes, or other magnetic storage devices, or any other possible non-transitory medium which is used to store information or instructions that can be accessed by a computer device, and the like.

According to the wireless receiving device, when the 802.11B multi-antenna mode is adopted to communicate with the transmitting device with at least two transmitting antennas, on the premise that the advantages of adopting multi-antenna simultaneous transmission to obtain larger signal gain, wider coverage range and the like are maintained, multiple paths of identical information which are simultaneously transmitted by the multiple antennas of the transmitting device are received by adopting the multiple receiving antennas, one path of the multiple paths of signals is selected to be processed or the multiple paths of signals are combined to obtain a final signal according to the synchronous deviation of the received multiple paths of signals, so that resource waste caused by the fact that a receiving end configured with the multiple antennas only uses one antenna to receive the signals is avoided, the quality of the received signals can be improved, the sensitivity of a receiver is improved, and meanwhile, calculation resources are saved and the power consumption is reduced.

There is also provided, in accordance with an embodiment of the present application, a non-transitory computer-readable storage medium having stored thereon executable instructions that, when executed by a wireless receiving device equipped with at least two receiving antennas, implement various operations of a wireless signal processing method according to an embodiment of the present application.

Furthermore, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of the various embodiments across), adaptations or alterations as pertains to the present application. Elements in the claims are to be construed broadly based on the language employed in the claims and are not limited to examples described in the present specification or during the practice of the present application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above detailed description, various features may be grouped together to streamline the application. This is not to be interpreted as an intention that the disclosed features not being claimed are essential to any claim. Rather, the subject matter of the present application is capable of less than all of the features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with one another in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present invention by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present invention.

Claims (13)

1. A wireless communication method performed by a receiving apparatus equipped with at least two receiving antennas, comprising:

receiving, with two receiving antennas, two signals including a first signal and a second signal from a transmitting device having at least two transmitting antennas;

performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals;

and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals.

2. The method according to claim 1, wherein selecting or combining the two signals to obtain a final signal according to the synchronization deviation of the two signals comprises:

under the condition that the synchronous deviation exceeds a reasonable range, selecting a single-path signal with good signal quality from the two paths of signals as the final signal;

and under the condition that the synchronous deviation is in a reasonable range, combining the two paths of signals to obtain the final signal.

3. The method of claim 1, wherein timing synchronization of the two signals comprises correlating with a local barker correlator.

4. The wireless communication method according to claim 3, further comprising determining whether the synchronization deviation is out of a reasonable range according to whether the following formula (1) holds:

[ Index1-Index 2| > TH equation (1)

Wherein Index1 is the timing position of the first path of signal output by the barker correlator, index2 is the timing position of the second path of signal output by the barker correlator, and TH is the first threshold.

5. The method of claim 4, wherein the first threshold is determined based on a delay between the received two signals and a use environment of the receiving device.

6. The method of wireless communication according to claim 4, further comprising: when the formula (1) is not satisfied, the following processing is performed first, and then the two paths of signals are combined:

performing synchronous position alignment processing on the two paths of signals;

performing frequency offset compensation processing on the two paths of signals with the aligned synchronous positions;

According to the information analyzed by PLCP Header frames of each signal in the two paths of signals, respectively performing DSSS despreading processing or fast Walsh conversion processing on the corresponding signals after the frequency offset compensation processing; and

and carrying out phase offset compensation processing and decision feedback equalization processing on the two paths of signals after DSSS despreading processing or fast Walsh conversion processing.

7. The method of claim 6, wherein the phase offset compensation process and the frequency offset compensation process for the two signals are performed by means of symbol decisions using a phase locked loop.

8. The method according to claim 6, wherein in the case where the formula (1) is not established, the combining processing of the two signals further includes:

combining by directly adding the two signals subjected to the phase offset compensation processing and the frequency offset compensation processing, or

The two signals subjected to the phase offset compensation processing and the frequency offset compensation processing are combined in a manner of respectively carrying out weighted summation based on respective gain factors.

9. The method according to any one of claims 1 to 8, wherein the receiving device operates in an IEEE 802.11B wireless local area network standard in which a multi-antenna transceiving mode is defined.

10. A wireless receiving apparatus, comprising:

at least two receive antennas, wherein the two receive antennas are configured to receive two signals including a first signal and a second signal from a transmitting device having at least two transmit antennas; and

a processing unit configured to:

acquiring two paths of signals received by the two receiving antennas from a transmitting device with two transmitting antennas;

performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals;

and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals.

11. The wireless receiving device of claim 10, wherein selecting or combining the two signals to obtain a final signal according to the synchronization deviation of the two signals comprises:

under the condition that the synchronous deviation exceeds a reasonable range, selecting a single-path signal with good signal quality from the two paths of signals as the final signal;

And under the condition that the synchronous deviation is in a reasonable range, combining the two paths of signals to obtain the final signal.

12. The wireless receiving device of claim 10, further comprising a local barker code correlator configured to correlate the two signals with a SYNC signal to obtain respective timing positions of the two signals.

13. A non-transitory computer storage medium having stored thereon executable instructions that, when executed by a wireless receiving device equipped with at least two receiving antennas, implement a wireless signal processing method comprising:

acquiring two paths of signals received by two receiving antennas of a wireless receiving device from a transmitting device with two transmitting antennas;

performing timing synchronization processing on the two paths of signals to obtain synchronization deviation of the two paths of signals;

and selecting or combining the two paths of signals according to the synchronization deviation of the two paths of signals to obtain a final signal, wherein the signal quality of the final signal is superior to that of a single path signal with poorer signal quality in the two paths of signals.

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