CN103780299A - Antenna switchover receiving system and transmitting system corresponding to same - Google Patents
Antenna switchover receiving system and transmitting system corresponding to same Download PDFInfo
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- CN103780299A CN103780299A CN201310473939.5A CN201310473939A CN103780299A CN 103780299 A CN103780299 A CN 103780299A CN 201310473939 A CN201310473939 A CN 201310473939A CN 103780299 A CN103780299 A CN 103780299A
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Abstract
In an antenna switchover receiving system and a transmitting system corresponding to the antenna switchover receiving system, the systems do not process heavy burden processing, and antennas in high signal quality are correctly chosen, and the systems are in simple and low cost structure, so influence of horizontal fluctuation caused by multipath declination is reduced. When a unique word detection portion detects any first unique word (UW1) in a plurality of first unique words (UW1) which are formed by same bit strings, a signal processing portion detects quality of received wireless signals in a first set time (T1). Then, after an antenna control portion switch over the antennas, the signal processing portion also detects quality of the wireless signals received by switched antenna in second set time (T2). An antenna control portion chooses the antenna whose signal quality detected by the signal processing portion is high to receive later effectively load.
Description
Technical field
The present invention relates to a kind of antenna that switched antenna receives in wireless communication system and switch receiving system etc.
Background technology
In wireless communication system, list as one of problem the level being caused by multipath decline (Multipath Fading) deteriorated.The signal that reception antenna receives is not only the signal that is directly inputted to reception antenna from transmitting antenna, also has the signal of inputting via multiple different paths.Therefore, the signal (multipath) with different time of delay is also imported into reception antenna, thereby overlaps each other, cancels out each other etc. and cause reception level deteriorated at reception antenna end place signal.Here it is is called as by the multipath deteriorated phenomenon of level causing that declines.
As for avoiding this by the decline representative countermeasure of the deteriorated impact of the level that causes of multipath, there are the Multicarrier Transmission Technologies such as OFDM.It is following technology: the information of transmission is divided into multiple carrier waves (subcarrier (sub carrier)) and transmits with wide frequency band, therefore can reduce by the multipath deteriorated impact of level causing that declines.But, in OFDM transmission, the labyrinth that need to convert to process to frequency axis and time shaft by inverse fourier transform and Fourier transform, thus cause circuit scale to increase, therefore existence is difficult to realize the shortcoming of cost degradation.
The countermeasure of " synthetic diversity " that in addition, " switched diversity (diversity) ", " selection diversity " and the reception signal by each antenna of existence based on multiple antennas are switched synthesizes.The impact that these countermeasures have been utilized multipath decline is according to the plane of polarization of the position of receiver, electric wave etc. and different characteristics." selection diversity " is the technology that monitors in advance the reception level of multiple antennas and receive signal by best antenna, but becomes large shortcoming because the receiver of number that need to be suitable with the number of antenna exists circuit scale.In addition, " synthetic diversity " be make by multiple antenna receptions to the phase place of signal unanimously carry out synthetic technology, but also due to the receiver of number that need to be suitable with the number of antenna and make the consistent phase shifter of phase place of each signal exist circuit scale to become large shortcoming.
" switched diversity " is following a kind of technology: in an antenna, have the impact of multipath decline, reduce the impact of multipath decline by switching to another antenna.In recent years, due to the universal of portable radio machine, antenna switching part is also required to miniaturization, cost degradation, owing to forming and develop easily and circuit scale is little and " switched diversity " that can realize cost degradation is equipped in various wireless devices by a receiver.
But, in " switched diversity ", the reception level of the unclear antenna that switches destination before switched antenna.Therefore, there is following shortcoming: if the reception level at the antenna place of switching destination is lower, have to receive signal under worse condition.
And, in WLAN, the system of switched antenna is for substantially when receiving multiple bags (frame: of signal who forms preamble (preamble), unique word (unique word), payload (payload)) and be consecutively detected mistake in multiple bags.That is to say that switched antenna after mistake occurs, for occurred mistake, again sends identical bag by request transmitter and deals with (resending function).But, increase resending number of times due to multipath decline under the poor situation of communication environment, thereby be unsuitable for communicating and receiving successively with multiple equipment the equipment of new payload signal.
In order to overcome the above-mentioned shortcoming of " switched diversity ", various schemes are proposed.Following technology is for example proposed in patent documentation 1: the antenna that receives wireless signal at the multiple antennas of switching switches in receiving system, the quality of the wireless signal receiving on one side with specified period switched antenna is on one side compared, select the antenna for receiving payload.
In above-mentioned patent documentation 1, technology below disclosing in Fig. 6 to Fig. 9 etc.: multiple unique word test sections detect multiple unique word independently, correspondingly carry out different sky line options actions from detected unique word, suitably select thus antenna.Multiple unique word UW1 to UW4 is made up of different bit strings, and multiple unique word test sections are waited for unique word UW1 to UW4 simultaneously, and the UW1 to UW4 comprising is detected.
Patent documentation 1:WO2012/028917 communique
Summary of the invention
the problem that invention will solve
The processing of simultaneously waiting for multiple unique word UW1 to UW4 as above is born heavily concerning receiving system, and multiple unique word test sections of carrying out this processing bear corresponding load.Therefore, in above-mentioned patent documentation 1 to comprising that the base band part of multiple unique word test sections applied the CPU (Central Processing Unit: CPU) with high gauge.In addition, transmission speed when communication is higher, requires the more senior CPU of application.
But the CPU of high standard that what disposal ability was high have is with high costs, it is therefore one of reason hindering the reduction of the manufacturing cost of wireless communication system.In addition, wireless communication system in recent years has the trend of diversified function of embedding, if by CPU for detection of multiple unique words, can produce the worry that the execution of other function is temporarily hindered.
The present invention completes in order to address the above problem., thus its object is to provide a kind of not to be followed the heavy processing of burden and correctly selects antenna that signal quality is high can reduce by the decline antenna switching receiving system etc. of impact of the level variation that causes of multipath with simple and cheap structure.
for the scheme of dealing with problems
In order to achieve the above object, antenna of the present invention switches receiving system to be possessed: antenna control part, and it controls the switching of multiple antennas, bit string test section, it is searched for the wireless signal of selecting a property ground switched antenna while receive, detects unique word, and signal quality test section, it detects the quality of the wireless signal received by each antenna, wherein, in the time that above-mentioned bit string test section detects any first unique word in multiple the first unique words within the first stipulated time, above-mentioned signal quality test section detects the quality of received wireless signal, wherein, this first unique word is identical with the bit string of predefined unique word or is the bit string below setting with respect to the error rate of the bit string of above-mentioned predefined unique word, after above-mentioned antenna control part switches antenna, above-mentioned bit string test section is searched for other first unique word beyond above-mentioned any first unique word within the second stipulated time, thus above-mentioned signal quality test section to the antenna reception by after switching to the quality of wireless signal detect, above-mentioned antenna control part is selected the high antenna of signal quality being detected by above-mentioned signal quality test section, payload after receiving.
In this invention, preferably, when when selected the antenna that above-mentioned signal quality is high at above-mentioned antenna control part after, above-mentioned bit string test section detects second unique word different from above-mentioned the first unique word within the 3rd stipulated time, not switched antenna and be still fixed as antenna that above-mentioned signal quality the is high payload after receiving of above-mentioned antenna control part.
In this invention, preferably, above-mentioned the first stipulated time is equivalent to above-mentioned the first unique word and the time in two cycles of the preamble that received before this first unique word, and above-mentioned the second stipulated time is equivalent to the time more than one-period of above-mentioned the first unique word and above-mentioned preamble.
In this invention, preferably, above-mentioned the 3rd stipulated time is equivalent to by three of above-mentioned preamble and above-mentioned the first unique word the time more than cycle and above-mentioned the second unique word and the time of the one-period of the preamble that received before this second unique word is added time of gained.
In this invention, preferably, also possess detection of preamble portion and Data Detection portion, the header that above-mentioned payload comprises detects in this detection of preamble portion, the data that above-mentioned payload comprises detect in this Data Detection portion, can not complete the detection of above-mentioned header time, do not receive the data of payload in above-mentioned detection of preamble portion within the 4th stipulated time, and switched antenna again, and revert to the action that is detected above-mentioned the first unique word by above-mentioned bit string test section.
In this invention, preferably, also possesses time of reception renewal portion, the length that this time of reception renewal portion comprises based on above-mentioned header was upgraded the data receiver time for detection of above-mentioned data, can not complete the detection of above-mentioned data in the data receiver time in above-mentioned Data Detection portion after being upgraded by above-mentioned time of reception renewal portion time, switched antenna again, and revert to the action that is detected above-mentioned the first unique word by above-mentioned bit string test section.
In addition, transmitting system of the present invention is corresponding with above-mentioned antenna switching receiving system, sends above-mentioned multiple the first unique word before above-mentioned payload.
In this invention, preferably, after having sent above-mentioned multiple the first unique word, before above-mentioned payload, send above-mentioned the second unique word.
In this invention, preferably, before each first unique word, send above-mentioned preamble.
the effect of invention
Switch receiving system according to antenna of the present invention, bit string test section, without wait for multiple unique word simultaneously, has therefore alleviated the processing load of bit string test section.Thus, even if the CPU with replacement high prices such as the IC (Integrated Circuit: integrated circuit) of low specification forms bit string test section, also can correctly select the antenna that signal quality is high, thereby can reduce by the decline impact of the level variation causing of multipath with simple and cheap structure.In addition, the action that detects the first unique word by the antenna after switching is limited to the second stipulated time, therefore can alleviates the processing load of bit string test section.In addition, also can tackle without problems for the situation that can only receive signal by a side antenna.This be due to, even by the antenna reception after switching to the quality of wireless signal be not able to detect the level of the first unique word, also can after through the second stipulated time, end the detection of the first unique word and transfer to the preparation of the detection of the second unique word.
Accompanying drawing explanation
Fig. 1 is the block diagram that represents the concept of the HEMS of the antenna switching receiving system of application based on an embodiment of the invention.
Fig. 2 represents to possess this antenna switch receiving system and the transmitting system corresponding with it and form the HEMS controller of this HEMS and the block diagram of the Sketch of various home appliances.
Fig. 3 represents that this antenna switches the block diagram of the structure of receiving system.
Fig. 4 is the signal that represents in this embodiment to send from corresponding transmitting system, switches antenna that receiving system switches, figure by the signal of each antenna reception and the variation of reception level thereof by this antenna.
Fig. 5 is the signal that represents in this embodiment to send from corresponding transmitting system, switches antenna that receiving system switches, other figure by the signal of each antenna reception and the variation of reception level thereof by this antenna.
Fig. 6 is the signal that represents in this embodiment to send from corresponding transmitting system, switches antenna that receiving system switches, another figure by the signal of each antenna reception and the variation of reception level thereof by this antenna.
Fig. 7 is the signal that represents in this embodiment to send from corresponding transmitting system, switches antenna that receiving system switches, another figure by the signal of each antenna reception and the variation of reception level thereof by this antenna.
Fig. 8 represents that this antenna switches the flow chart of the action of receiving system.
Fig. 9 is the figure that represents to be switched by this antenna the structure of the payload of receiving system reception.
Figure 10 is the flow chart of an example of the action of the #1 to #7 in detailed presentation graphs 8.
Figure 11 is the flow chart of an example of the action of the #9 to #14 in detailed presentation graphs 8.
Figure 12 is the flow chart of an example of the action of the #20 to #23 in detailed presentation graphs 8.
Figure 13 is the flow chart of an example of the action of the #23 in detailed presentation graphs 8.
Figure 14 is the flow chart that represents in more detail an example of the action of Figure 13.
description of reference numerals
1: antenna switches receiving system; 3: antenna switching part; 41:RF portion (signal quality test section); 44: preamble test section (bit string test section); 45: unique word test section (bit string test section); 51: signal processing part (signal quality test section, detection of preamble portion, Data Detection portion, time of reception renewal portion); 52: antenna control part; 70: transmitting system; UW1: unique word (the first unique word); UW2: unique word (the second unique word).
Embodiment
With reference to accompanying drawing, receiving system is switched in the antenna of an embodiment of the invention in Benq.Fig. 1 represents to be called as the EMS of HEMS (Home Energy Management System: family's EMS) etc.HEMS refers to following system: the home appliance in family etc. connected by communication network, and unified control together with distribution board, home-use generating equipment etc., carry out thus for the information indicating of power saving, automatically control.HEMS 100 is made up of HEMS controller 101, various home appliance 102, solar generator 103, fuel cell 104, storage battery 105, electric automobile 106, the information processing terminal 107 and distribution board 108 etc.Distribution board 108 is built-in with power measurement communicator 108a.Distribution board 108 is connected with the intelligent instrument 109 outside room.Intelligent instrument 109 offers each user family from Utilities Electric Co., for powering to distribution board 108 from power transmission line, and the trunk electric power in distribution board 108 is measured.In addition, for example, be input to HEMS controller 101 for the various information (requirement of economize on electricity etc.) of each user family via intelligent instrument 109 and power measurement communicator 108a from the server 110 of Utilities Electric Co..Power measurement communicator 108a is connected by wired or wireless mode with intelligent instrument 109.Power measurement communicator 108a can be also following mode: be arranged at the outside of distribution board 108, be connected with distribution board 108 by wired mode etc.Intelligent instrument 109 is connected by wired or wireless mode with the intelligent instrument 109 in other house and the server 110 of Utilities Electric Co. etc., forms intelligent instrument network.
HEMS controller 101 is energy-saving control devices of wireless type, is responsible for the control of various device as above-mentioned server.HEMS controller 101 is set up two-way communicating by letter with (being made as below home appliance 102 etc.) such as home appliance 102, solar generator 103, fuel cell 104, storage battery 105, electric automobile 106, the information processing terminal (monitor apparatus) 107 and distribution boards 108 by wired or wireless mode.Each equipment also can be configured to the structure being connected with HEMS controller 101 via miscellaneous equipment.Can be also for example, fuel cell 104 be connected by wired mode with the power measurement communicator 108a of distribution board 108, and power measurement communicator 108a is connected by wireless mode with HEMS controller 101.In this case, between fuel cell 104 and HEMS controller 101, set up two-way communicate by letter by wired with wireless mode via power measurement communicator 108a.
Fig. 2 represents HEMS controller 101 in HEMS 100 and the Sketch of various home appliance 102.Forming in the various device of HEMS 100, carry out the equipment of radio communication, such as in HEMS controller 101 and home appliance 102 etc., be equipped with respectively corresponding transmitting system and receiving system.What apply as this receiving system is the antenna switching receiving system 1 based on an embodiment of the invention, and what apply as corresponding transmitting system is transmitting system 70 of the present invention.That is, bring into play function in the transmitting system 70 of HEMS controller 101, the antenna of home appliance 102 grades switches receiving system 1 brings into play function, and the transmission of carrying out wireless signal receives.On the other hand, bring into play function in the transmitting system 70 of home appliance 102 grades, the antenna of HEMS controller 101 switches receiving system 1 brings into play function, and the transmission of carrying out wireless signal receives.In addition, Fig. 2 is exemplified with the structure of HEMS controller 101 and home appliance 102, replaces home appliance 102 but also can power application measure the equipment such as communicator 108a.
Fig. 3 represents that antenna switches receiving system.Antenna switches receiving system 1 and is made up of receiver 2 and multiple antenna A, B etc.Receiver 2 is made up of antenna switching part 3, RFIC 4, CPU 5 etc.
Represent that preamble test section 44 detects that the signal of preamble is imported into unique word test section 45, CPU 5 etc.Also can be configured to, this signal outputs to CPU 5 and is input to unique word test section 45 etc. via CPU 5 from preamble test section 44.
Unique word test section 45, to being searched for by the baseband signal of synchronously setting up after portion 43 sets up synchronously, detects the bit string of unique word.In unique word test section 45, preset and store the bit string of known unique word (identical with the unique word sending from transmitting system).By the bit string of baseband signal is detected to unique word with the consistent degree evaluation of pre-stored bit string.Both can in the time that both be in full accord, be judged as and unique word be detected, can be to be also judged as below setting time unique word to be detected with respect to the error rate of the bit string of pre-stored unique word in the bit string of baseband signal.This be due to, also can regard as in the latter case and the bit string identical in fact with the bit string of pre-stored unique word from baseband signal, be detected.Represent that unique word test section 45 detects that the signal of unique word is imported into the signal processing part 51 of CPU 5 etc.In addition, above-mentioned known preamble and unique word share between corresponding transmitting system, send the bag with this preamble and unique word from transmitting system.
In addition, present embodiment is the structure of by antenna switching part 3, two antennas being switched to receive wireless signal, but the number of antenna can be also more than three.
Signal that Fig. 4 to Fig. 7 represents to send from corresponding transmitting system, by antenna switch antenna that receiving system 1 switches, by the signal of each antenna reception and the variation of reception level thereof.Bag is made up of multipair preamble and unique word and the payload that sends after multipair preamble and unique word etc.In the present embodiment, send unique word UW1 (the first unique word) and these two kinds of unique words of unique word UW2 (the second unique word) from transmitting system.
Unique word UW1 receives the antenna of payload for selecting antenna to switch receiving system 1.Unique word UW2 is for detection of the beginning (, start location (Head and go out) of payload).The preamble sending before unique word UW1 both can be made up of identical bit string with the preamble sending before unique word UW2, also can be made up of different bit strings.On the other hand, form preamble, unique word UW1 and unique word UW2 by the bit string that correlation is low each other, make them can be by error detection.
Which make no matter timing switched antenna A, B can both receive this unique word UW1 at for twice unique word UW1 of the each transmission of each antenna.Before all unique words, all send preamble.In addition, after the 4th unique word UW1 and before being close to the preamble sending before unique word UW2, send virtual data (dummy data).In addition, also can insert as required the data of the switching stand-by period for giving antenna in beginning place of later for the second time preamble and virtual data.
Antenna switches receiving system on one side for example, with cycle (cycle of the twice in the transmission cycle of preamble and unique word UW1: the first stipulated time T1) switched antenna A, the B of regulation, receives the wireless signal sending from transmitting system on one side.By the counter 53 of bringing into play function as the first counter, the first stipulated time T1 is counted.For the signal receiving, carry out down-conversion by RF portion 41 as described above, carry out demodulation by demodulation section 42, set up bit synchronization by synchronously setting up portion 43.Then, detect preamble by preamble test section 44, detect unique word UW1 by unique word test section 45.
As mentioned above, send for each antenna is each which timing switched antenna A is twice preamble and unique word UW1 no matter make at, B can both receiving preamble and unique word UW1.In the present embodiment, owing to using two antennas, therefore as shown in Figures 4 to 7, preamble and unique word UW1 are sent out four times separately.Like this, being equipped on preamble and the unique word UW1 of twice that antenna switches the antenna number of receiving system is sent out.In addition, before unique word UW1 being detected at first, with cycle of the twice in transmission cycle of preamble and unique word UW1, the first stipulated time T1 switches each antenna.In the time any unique word UW1 being detected, after switched antenna, in the second stipulated time T2, search for other unique word UW1.More than the second stipulated time T2 is set to the time suitable with the transmission cycle of preamble and unique word UW1, by the counter 53 of bringing into play function as the second counter, this second stipulated time T2 is counted.In addition, the time of insertion virtual data is suitable with the second stipulated time T2.In the present embodiment, to in the first stipulated time T1, compare in the quality that the wireless signal receiving after the quality of the wireless signal receiving before unique word UW1 and switched antenna detected at first in the second stipulated time T2, select the antenna for receiving payload.In the time having selected antenna, in the 3rd stipulated time T3, search for preamble and unique word UW2.The time that the 3rd stipulated time T3 is set to the one-period of the time more than cycle and preamble and unique word UW2 by three of preamble and the first unique word UW1 is counted the 3rd stipulated time T3 by the counter 53 of bringing into play function as the 3rd counter more than being added the time of gained.
Antenna when Fig. 4 and Fig. 5 represent to detect unique word UW1 by antenna A and B switches action etc.The solid line part receiving in signal is the signal arriving by each antenna reception.In addition, in the following description, for convenience's sake, the antenna that is receiving wireless signal (movable (active)) in the time that preamble test section 44 and unique word test section 45 detect preamble and unique word UW1 is at first made as to antenna A.Fig. 4 represents that the reception level of the wireless signal receiving by antenna A is than the high situation of reception level of the wireless signal receiving by antenna B, and Fig. 5 represents that the reception level of the wireless signal receiving by antenna B is than the high situation of reception level of the wireless signal receiving by antenna A.
In Fig. 4 and Fig. 5, the preamble sending is for the first time not detected because antenna is switched in its receiving course, and the preamble sending is for the second time received by antenna A, is detected by preamble test section 44.In the time preamble being detected, start to detect reception level by RF portion 41.Afterwards, detect reception level with the sampling period stipulating.In addition, the unique word UW1 that then preamble sends is detected by unique word test section 45.Till the detection of reception level lasts till and detects unique word UW1, the information relevant with detected reception level is successively stored in signal processing part 51.Signal processing part 51 its mean value of reception level calculation (being made as RA) based on stored.
In the time unique word UW1 being detected, represent that the signal of this meaning is exported and is input to signal processing part 51 from unique word test section 45.Represent to detect that the signal of unique word UW1 is transferred to antenna control part 52 from signal processing part 51, antenna control part 52 represents the instruction of switched antenna to 3 outputs of antenna switching part, and antenna is switched to antenna B.Afterwards, the preamble sending is for the third time received by antenna B, is detected by preamble test section 44.In the time preamble being detected, during with antenna A, similarly, detect reception level with the sampling period stipulating, detect unique word UW1.The information relevant with the reception level of antenna B and the above-mentioned information relevant with the reception level of antenna A are distinguished and is successively stored in signal processing part 51, signal processing part 51 its mean value of reception level calculation (being made as RB) based on stored.
The RA being calculated by signal processing part 51 and RB are imported into antenna control part 52.Antenna control part 52 compares the RA being calculated by signal processing part 51 and RB, and the antenna that can obtain high signal quality is chosen as the antenna for receiving payload.
In Fig. 4, the reception level of antenna A is higher than the reception level of antenna B, i.e. therefore RA>RB thinks that the quality of the wireless signal that the mass ratio of the wireless signal that receives by antenna A receives by antenna B is high.Therefore, antenna control part 52 compares the RA being calculated by signal processing part 51 and RB the antenna A that receives higher level is chosen as to the antenna for receiving payload.Thus, antenna is switched to antenna A again, is fixed as antenna A until receive this bag.Thereby the preamble, unique word UW1 and the virtual data that send for the 4th time are received by antenna A, preamble, unique word UW2 and payload afterwards are also received by antenna A.
In Fig. 5, the reception level of antenna B is higher than the reception level of antenna A, i.e. therefore RB>RA thinks that the quality of the wireless signal that the mass ratio of the wireless signal that receives by antenna B receives by antenna A is high.Therefore, antenna control part 52 compares the RA being calculated by signal processing part 51 and RB the antenna B that receives higher level is chosen as to the antenna for receiving payload.Thus, until receive not switched antenna and be fixed as antenna B of this bag.Thereby the preamble, unique word UW1 and the virtual data that send for the 4th time are received by antenna B, preamble, unique word UW2 and payload afterwards are also received by antenna B.
Fig. 6 is expressed as follows situation: the preamble etc. sending is for the second time received by antenna A and detected by preamble test section 44 etc., and switching to antenna B after, the preamble of transmission is not detected by preamble test section 44 for the third time.In the time the unique word UW1 sending for the second time being detected, immediately switch to thereafter antenna B, the preamble therefore sending for the third time is in fact from the starting received by antenna B.Thereby, from the wireless signal receiving by antenna B, detect the required minimum times such as preamble and equate with the time that sends one group of preamble and unique word UW1.Therefore, in the case of not detecting for the third time the preamble that sends etc., both can receive the preamble that sends for the 4th time etc. by antenna B, also can immediately antenna be switched to as shown in Figure 6 to antenna A.The former in the situation that, the second stipulated time T2 is set to the time suitable with the twice in transmission cycle of preamble and unique word UW1, can obtain twice use antenna B and detect the chance of preamble etc.Thereby the chance that can detect the reception level of antenna B increases, thereby can further suitably carry out the selection of antenna.In the latter case, the second stipulated time T2 is set to the time suitable with the transmission cycle of preamble and unique word UW1, the length setting of virtual data can be obtained to the short payload shared ratio in bag that increases.The length setting of virtual data can be obtained to short the reasons are as follows.For example, in the case of the unique word UW1 that detects at first the 4th time by antenna A (with reference to Fig. 7), antenna can be switched to antenna B and receive virtual data.Now, use antenna B to detect twice preamble etc. if be configured to as the former, need the virtual data in two cycles of preamble and unique word UW1.On the other hand, by as the latter, the chance that uses antenna B to detect preamble etc. being restricted to once, with the virtual data of the one-period of preamble and unique word UW1.
In the latter case, from the wireless signal receiving by antenna B, preamble etc. do not detected, therefore think that its signal quality is not sufficient to receive payload.In addition, can also think RB=0.Thereby the antenna A that antenna control part 52 can obtain sufficiently high signal quality is chosen as the antenna for receiving payload, antenna is switched to antenna A again, is fixed as antenna A until receive this bag.In the situation that thinking RB=0, also carry out identical action.In addition, if although can detect that by antenna B preamble can not detect UW1, with the above-mentioned antenna A that similarly switches to.Later action is identical with Fig. 4.
Fig. 7 is expressed as follows situation: the preamble etc. sending for the 4th time is received by antenna A, is detected by preamble test section 44 grades as preamble initial in this bag etc.In this case, after the unique word UW1 sending for the 4th time being detected, switch to antenna B, receive virtual data.
Virtual data refers to the data that are made up of the bit string that is different from preamble, is switch temporal delay of receiving system 1 while again switching to antenna A from antenna B and send from transmitting system in order to give antenna.Thereby the data length of virtual data is set to be greater than and equals the data length of preamble and the data length sum of unique word UW1, i.e. the second stipulated time T2.
Virtual data by and preamble and unique word UW1 and UW2 between the low bit string of correlation form.This is to be preamble and unique word UW1 and UW2 for fear of preamble test section 44 and unique word test section 45 by virtual data error detection.Expect, the correlation of correlation, virtual data and unique word UW1 and the correlation of virtual data and unique word UW2 of each bit string being set for to virtual data and preamble are minimum.But, as long as above-mentioned correlation low to can prevent preamble test section 44 and unique word test section 45 error detection degree, need only above-mentioned correlation be less than setting, just can not produce the problem in practicality.
As shown in Figure 7, in the situation that receiving virtual data by antenna B, can not detect preamble by preamble test section 44, can not detect unique word UW1 by unique word test section 45.In addition, although the preamble etc. sending is for the second time received by antenna B, preamble etc. do not detect by preamble test section 44 grades, therefore think the of low quality of the signal that receives by antenna B.Thereby the antenna A that antenna control part 52 can obtain sufficiently high signal quality is chosen as the antenna for receiving payload, antenna is switched to antenna A again, is fixed as antenna A until receive this bag.Later action is identical with Fig. 4.
Fig. 8 represents that antenna switches the action of receiving system 1.First, in the last stage of detecting unique word UW1, with alternately switched antenna A, B (#1) of specified period.The specified period of switched antenna is for example two cycles of preamble and unique word UW1, i.e. the first stipulated time T1.In the time that antenna is switched, the detection of the bit string of preamble and unique word UW1 be reset (#2).The detection of the bit string of preamble and unique word UW1 is reset and refers to the processing of ending the detection of bit string and restart detection from initial position.Now, unique word UW1 is set as to the bit string that unique word test section 45 should detect., start to detect unique word UW1.It is the reason based on following that the detection of preamble test section 44 and unique word test section 45 bit strings resets.That is, for prevent which part reception signal that following situation: RFIC 4 inputs from antenna switching part 3 because None-identified goes out by which antenna reception to, therefore mistake the antenna that receives preamble and unique word.For example, in order to prevent following situation: near the end of the bit string of unique word, switch to antenna B from antenna A, although received the major part of bit string by antenna A, think that the antenna B by receiving last part receives whole bit string by mistake.
Receive wireless signal by be set as movable antenna by switching, search for preamble (#3) by preamble test section 44.In the time preamble being detected by preamble test section 44 (#4: "Yes"), start to detect reception level (#5).The antenna that now receives wireless signal is made as to antenna A.Sampling period with regulation is detected reception level, and the value of this reception level is successively stored in signal processing part 51 (in #12 too).In #4, in #2 the detection of bit strings reset after preamble detection continue the first stipulated time, the in the situation that of preamble not detected within the first stipulated time, (#4: "No"), turns back to #1.At this, the first stipulated time referred to the time suitable with two cycles of preamble and unique word UW1, after the detection of bit strings resets in #2, started counting.Unique word UW1 detected after the detection at preamble time (#6: "Yes"), finish the detection (#7) of reception level.In #6, in the first stipulated time that the detection of unique word UW1 starts to calculate after the reset detecting from the bit string #2, continue.The in the situation that of unique word UW1 not detected within the first stipulated time (#6: "No"), finish the detection of reception level, turn back to #1.
In the time that the detection of the reception level of antenna A finishes, (#8), antenna is switched to antenna B (#9) by antenna control part 52 to the reception level calculation mean value (RA) of signal processing part 51 based on stored.In the time that antenna has been carried out to switching, with #2 similarly, the detection of the bit string to preamble and unique word UW1 reset (#9A).Then, receive wireless signal by the antenna B after switching, search for preamble (#10) by preamble test section 44.In the time preamble being detected by preamble test section 44 (#11: "Yes"), start to detect reception level (#12).In #11, in #9A the detection of bit strings reset after preamble detection continue the second stipulated time, as shown in Fig. 6 or Fig. 7, the in the situation that of preamble not detected within the second stipulated time, (#11: "No"), transfers to #19.This is can not obtain enough signal qualitys owing to can being judged as by antenna B.At this, the second stipulated time referred to the time suitable with the one-period of preamble and unique word UW1, after the detection of bit strings resets in #9A, started counting.Unique word UW1 detected after the detection at preamble time (#13: "Yes"), finish the detection (#14) of reception level.In #11, in the second stipulated time that the detection of unique word UW1 continues to start to calculate reset afterwards from the detection of bit strings #9A, continue.The in the situation that of unique word UW1 not detected within the second stipulated time (#13: "No"), finish the detection of reception level, and transfer to #19.This is can not obtain enough signal qualitys owing to can being judged as by antenna B.
In the time that the detection of the reception level of antenna B finishes, (#15), mean value RA and the RB of the reception level being calculated by signal processing part 51 are compared (#16) by antenna control part 52 to the reception level calculation mean value (RB) of signal processing part 51 based on stored.The in the situation that of RA<RB as shown in Figure 5 (#17: "Yes"), antenna B is chosen as the antenna for receiving payload by antenna control part 52.That is, antenna is fixed as to antenna B (#18), the detection of bit strings reset (#20).Now, unique word UW2 is set as to the bit string that unique word test section 45 should detect., start to detect unique word UW2.On the other hand, the in the situation that of RA>RB as shown in Figure 4 (#17: "No"), antenna A is chosen as to the antenna for receiving payload., antenna is switched to antenna A (#19), and transfer to #20.
In the time receiving wireless signal and preamble detected by preamble test section 44 by selected antenna A or B (#21: "Yes"), transfer to the detection (#22) of unique word UW2.In the time unique word UW2 being detected by unique word test section 45 (#22: "Yes"), the beginning of payload has been located, and receives payload (#23) later.By signal processing part 51, received payload is processed.In addition, in #21, after the detection of preamble detection of bit strings in #20 resets, within the 3rd stipulated time, continue, the in the situation that of preamble not detected by preamble test section 44 within the 3rd stipulated time (#21: "No"), turn back to #1.At this, the 3rd stipulated time was equivalent to the one-period of two cycles, virtual data and the preambles of preamble and unique word UW1 and unique word UW2 to be added the time of gained, after the detection of bit strings resets in #20, started counting.In addition, in #22, in the 3rd stipulated time that the detection of unique word UW2 starts to calculate after the reset detecting from the bit string #20, continue.The in the situation that of unique word UW2 not detected by unique word test section 45 within the 3rd stipulated time (#22: "No"), turn back to #1.
Fig. 9 represents the structure of the payload sending from corresponding transmitting system 70.Antenna A or B that payload is selected by antenna control part 52 are received.Payload is made up of header and data.In header, have the reception bags itself such as length (length), the ID of equipment and the classification of bag and process required additional information.Data are originally to want to switch in transmitting system 70 and antenna the main part that sends the data that receive between receiving system 1.In the beginning of header, be inserted with length.Length refers to the information relevant with the length of the data that then header sends.Detect header (length) and data and it is processed by the signal processing part 51 of CPU 5.In addition, also can be configured to by RFIC 4 and carry out the detection of header.
In the 4th stipulated time T4, search for header.Set the 4th stipulated time T4 according to the length of the header sending from transmitting system 70, by the counter 53 of bringing into play function as four-counter, the 4th stipulated time T4 is counted.The in the situation that of header not detected in the 4th stipulated time T4, the detection of signal processing part 51 abort header, switched antenna again, and revert to the action (with reference to Fig. 4 to Fig. 7) that the initial unique word UW1 in the bag to next sending detects.
In the time detecting length, know the length of data, therefore signal processing part (time of reception renewal portion) 51 setting data time of reception T5, in the interior reception data of data receiver time T 5.By the counter 53 of bringing into play function as the 5th counter, data time of reception T5 is counted.Data receiver time T 5 is pressed each bag and difference, and therefore signal processing part 51 length based on detected in the time at every turn detecting length is upgraded data time of reception T5.Even if the detection of data does not complete, if through data receiver time T 5, signal processing part 51 is also ended the detection of data.Then, switched antenna again, and revert to the action (with reference to Fig. 4 to Fig. 7) that the initial unique word UW1 in the bag to next sending detects.
Figure 10 at length illustrates an example of the action of the #1 to #7 in Fig. 8.In # 2, in the time that the detection of the bit string of preamble and unique word UW1 is reset, the counting of counter 53 is reset.Counting the be reset detection of the counting that refers to the intermission and the processing of the counting of time started again from zero.At this, counter 53 is brought into play function as the first counter, starts counting (#2B).Then, receive wireless signal (#3), when preamble detected by preamble test section 44 in the first stipulated time T1 time, (#4: "Yes") starts to detect reception level (#5).In the situation that preamble not detected (#4: "No"), the count value of counter 53 and the first stipulated time T1 are compared to (#4A).Do not reach (#4A: "No") the first stipulated time T1 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#4B), turns back to #3, continues to search for preamble from received signal.In the time that the count value of counter 53 becomes that the first stipulated time, T1 was above (#4A: "Yes"), turn back to the switching action (#1) of antenna.
After the detection of the reception level in #5 starts, in the time unique word UW1 being detected (#6: "Yes"), finish the detection (#7) of reception level.In the situation that unique word UW1 not detected (#6: "No"), the count value of counter 53 and the first stipulated time T1 are compared to (#6A).Do not reach (#6A: "No") the first stipulated time T1 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#6B), turns back to #6, continues search unique word UW1.In the time that the count value of counter 53 becomes that the first stipulated time, T1 was above (#4A: "Yes"), turn back to the switching action (#1) of antenna.
Figure 11 at length illustrates an example of the action of the #9 to #14 in Fig. 8.In this action case, when switched antenna detects other unique word UW1 when initial unique word UW1 detected in bag after, set time-out time (the second stipulated time T2).In the time of switched antenna in #9, the detection of the bit string of preamble and unique word UW1 is reset (#9A), and the counting of counter 53 is reset.At this, counter 53 is brought into play function as the second counter, starts counting (#9B).Then, receive wireless signal (#10), when preamble detected by preamble test section 44 in the second stipulated time T2 time (#11: "Yes"), start to detect reception level (#12).In the situation that preamble not detected (#11: "No"), the count value of counter 53 and the second stipulated time T2 are compared to (#11A).Do not reach (#11A: "No") the second stipulated time T2 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1 (#11B), turn back to #10, continue to search for preamble from received signal.In the time that the count value of counter 53 becomes that the second stipulated time, T2 was above (#11A: "Yes"), transfer to #19 and carry out switched antenna.
After the detection of the reception level in #12 starts, in the time unique word UW1 being detected (#13: "Yes"), finish the detection (#14) of reception level.In the situation that unique word UW1 not detected (#13: "No"), the count value of counter 53 and the second stipulated time T2 are compared to (#13A).Do not reach (#13A: "No") the second stipulated time T2 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#13B), turns back to #13, continues search unique word UW1.In the time that the count value of counter 53 becomes that the second stipulated time, T2 was above (#13A: "Yes"), transfer to #19 and carry out switched antenna.
Figure 12 at length illustrates an example of the action of the #20 to #23 in Fig. 8.In this action case, after the antenna of having selected for receiving payload, in the time detecting unique word UW2, set time-out time (the 3rd stipulated time T3).When the detection of bit strings reset and unique word UW2 is set as detecting bit string time (#20), the counting of counter 53 is reset.At this, counter 53 is brought into play function as the 3rd counter, starts counting (#20A).Then, receive wireless signal, when preamble detected by preamble test section 44 in the 3rd stipulated time T3 time (#21: "Yes"), transfer to the detection (#22) of unique word UW2.In the situation that preamble not detected (#21: "No"), the count value of counter 53 and the 3rd stipulated time T3 are compared to (#21A).Do not reach (#21A: "No") the 3rd stipulated time T3 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1 (#21B), turn back to #21, continue to search for preamble from received signal.In the time that the count value of counter 53 becomes the 3rd the stipulated time, T3 was above (#21A: "Yes"), turn back to the switching action (#1) of antenna.
Unique word UW2 detected by unique word test section 45 in the 3rd stipulated time T3 after the detection of the preamble in #21 time (#22: "Yes"), transfer to the reception (#23) of payload.In the situation that unique word UW2 not detected (#22: "No"), the count value of counter 53 and the 3rd stipulated time T3 are compared to (#22A).Do not reach (#22A: "No") the 3rd stipulated time T3 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#22B), turns back to #22, continues search unique word UW2.In the time that the count value of counter 53 becomes the 3rd the stipulated time, T3 was above (#22A: "Yes"), turn back to the switching action (#1) of antenna.
Figure 13 at length illustrates the #23 in Fig. 8, the example that reception of payload is moved.In this action case, for the detection of header, set time-out time (the 4th stipulated time T4).When unique word UW2 detected in #22 time, the counting of counter 53 is reset.At this, counter 53 is brought into play function as four-counter, starts counting (#23A).Then, receive wireless signal, detect header by signal processing part 51, in the time that the detection of header in the 4th stipulated time T4 completes (#23B: "Yes"), transfer to the reception (#23E) of data.In the uncompleted situation of detection of header (#23B: "No"), the count value of counter 53 and the 4th stipulated time T4 are compared to (#23C).Do not reach (#23C: "No") the 4th stipulated time T4 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#23D), turns back to #23B, continues to search for header from received signal.In the time that the count value of counter 53 becomes the 4th the stipulated time, T4 was above (#23C: "Yes"), turn back to the switching action (#1) of antenna.
Figure 14 illustrates the #23 in Fig. 8, the example that reception of payload is moved in more detail.In this action case, for the detection of length and header, set time-out time (the 4th stipulated time T4A and T4B).At this, the 4th stipulated time T4B is identical with the 4th stipulated time T4 in Figure 13.
In addition, in this action case, also set time-out time (data receiver time T 5) for the detection of data.Data length is pressed each bag and difference, and therefore signal processing part 51 upgrades the setting of data time of reception T5 in the time of each detection length, dynamically changes the time that Data Detection spends thus.
When unique word UW2 detected in #22 time, the counting of counter 53 is reset.At this, counter 53 is brought into play function as four-counter A and four-counter B, starts counting (#23A).Then, receive wireless signal, detect length by signal processing part 51, in the time that the detection of length in the 4th stipulated time T4A completes (#23F: "Yes"), transfer to the detection (#23B) of header.In the uncompleted situation of detection of length (#23F: "No"), the count value of counter 53 and the 4th stipulated time T4A are compared to (#23G).Do not reach (#23G: "No") the 4th stipulated time T4A in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#23H), turns back to #23F, continues search length from received signal.In the time that the count value of counter 53 becomes the 4th the stipulated time, T4A was above (#23G: "Yes"), turn back to the switching action (#1) of antenna.
In the time that the detection of the length in #23F completes, detect header (#23B) by signal processing part 51.In the time that the detection of header in the 4th stipulated time T4B completes (#23B: "Yes"), the length of signal processing part 51 based on detecting in #23F is upgraded the setting of data time of reception T5.Thus, dynamically optimize by each bag the time that signal processing part 51 spends in the detection of data, thereby alleviate the processing load of CPU 5.In addition, even do the signals such as unique word at the noise misidentification that received wireless signal is comprised, also can promptly revert to the action of search unique word UW1 etc.In the uncompleted situation of detection of header (#23B: "No"), the count value of counter 53 and the 4th stipulated time T4B are compared to (#23C).Do not reach (#23C: "No") the 4th stipulated time T4B in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#23D), turns back to #23B, continues to search for header from received signal.In the time that the count value of counter 53 becomes the 4th the stipulated time, T4B was above (#23C: "Yes"), turn back to the switching action (#1) of antenna.In addition, also the counter 53 of bringing into play function as four-counter B can be set after the detection of length completes in #23F for to (#23F: "Yes") detects to reset and starts the counting of the 4th stipulated time T4B.In this case, the 4th stipulated time T4B is the time that the 4th stipulated time T4 from Figure 13 deducts the four stipulated time T4A gained suitable with length.
In the time that the detection of header in #23B completes and in #23I, the setting of data time of reception T5 has been carried out to renewal, the count value of counter 53 is reset.At this, counter 53 is brought into play function as the 5th counter, starts counting (#23J).Then, receive wireless signal, detect data by signal processing part 51, when in the time that the detection of data receiver time T 5 interior data completes (#23K: "Yes"), turn back to the switching action (#1) of antenna.In the uncompleted situation of detection of data (#23K: "No"), the count value of counter 53 and data receiver time T 5 are compared to (#23L).Do not reach (#23L: "No") data receiver time T 5 in the count value of counter 53, after the count value that makes counter 53 increases progressively 1, (#23M), turns back to #23K, continues search data from received signal.When the count value of counter 53 becomes data receiver time T 5 when above (#23L: "Yes"), turn back to the switching action (#1) of antenna.
As above, switch receiving system 1 according to the antenna of present embodiment, unique word test section 45 is without wait for multiple unique word simultaneously.That is, in the #6 in Fig. 8 and #13, only wait for and detect unique word UW1, in #22, only wait for and detect unique word UW2, therefore significantly having alleviated the processing load of unique word test section 45.Though IC in recent years not as good as CPU advancing multifunction, this wait the processing that detects a unique word can realize by the function of utilizing RFIC 4 to possess.Thus, although the bit string measuring ability possessing with RFIC 4 forms unique word test section 45, can correctly select the antenna that signal quality is high.In addition, replace preamble test section 44 or unique word test section 45 etc. to detect preamble or unique word even if be configured to by CPU 5, the processing load of CPU 5 alleviate this be also on the one hand do not have vicissitudinous.Thereby, do not use the CPU 5 of high standard, and can reduce by the decline impact of the level variation causing of multipath with simple and cheap structure.The disposal ability of CPU 5 can be distributed to bit string other function beyond detecting, thereby can not follow cost to rise and build multi-functional antenna and switch receiving system 1.
In addition, the action that detects unique word UW1 by the antenna after switching is limited to the second stipulated time T2, therefore can alleviates the processing load of CPU 5.This be due to, even by the antenna reception after switching to the quality of wireless signal be not able to detect the level of unique word UW1, also can after through the second stipulated time T2, end the detection of unique word UW1 and transfer to the preparation of the detection of unique word UW2.(with reference to Fig. 6.)
In addition, receive unique word UW2 to detect the beginning position of payload by the antenna of being selected by antenna control part 52 as the high antenna of signal quality, therefore can suitably carry out the beginning location of payload.In addition, be still fixed as the antenna of being selected by antenna control part 52 and receive payload, therefore can obtain the signal of the payload that quality is high.
In addition, by selecting the action that detects unique word UW2 after antenna to be limited to the 3rd stipulated time T3, therefore can alleviate the processing load of CPU 5.This be due to, after the 3rd stipulated time T3 through suitably setting, the unique word UW2 can be not again not sending in these bags from transmitting system 70, the reception that therefore can end the detection of unique word UW2 and transfer to ensuing bag is prepared.
In addition, the first stipulated time T1 is set to the time in two cycles of preamble and unique word UW1, and the second stipulated time T2 is set to the time more than one-period of preamble and unique word UW1.Thereby, for the bag sending from transmitting system 70, no matter which timing switched antenna can both wait for any preamble and unique word UW1 with accepting state at.
In addition, the 3rd stipulated time T3 is set to the time that three of preamble and unique word UW1 the times more than cycle and the time of the one-period of the preamble receiving is added to gained before unique word UW2 and unique word UW2.Thereby, for the bag sending from transmitting system 70, no matter which timing switched antenna can both select to wait for unique word UW2 with accepting state after antenna at.
In addition, in the time that signal processing part 51 has been failed the detection of header in the 4th stipulated time T4, do not receive the data of payload and switched antenna again, and the detection that reverts to the unique word UW1 being undertaken by unique word test section 45 etc. is moved.Thus, can further alleviate the processing load of CPU 5.In addition, even do the signals such as unique word at the noise misidentification that received wireless signal is comprised, also can promptly revert to the action of search unique word UW1 etc.
In addition, in the time having failed the detection of data in the data receiver time T 5 of signal processing part 51 after renewal, switched antenna again, and the detection that reverts to the unique word UW1 being undertaken by unique word test section 45 etc. is moved.Thus, can further alleviate the processing load of CPU 5.In addition, the length comprising based on header dynamically updates and optimizes data time of reception T5 by each bag, therefore can further alleviate the processing load of CPU 5.
In addition, can build with antenna and switch radio transmission/reception system corresponding to receiving system 1 by the transmitting system that sent multiple unique word UW1 before payload.In addition, can be by building and further corresponding radio transmission/reception system of antenna switching receiving system 1 sending the transmitting system that sent unique word UW2 after multiple unique word UW1 before payload.In addition, can build with antenna and switch further corresponding radio transmission/reception system of receiving system 1 by the transmitting system that sent preamble before each unique word UW1.
In addition, the present invention is not limited to the structure of above-mentioned execution mode.As long as be configured to following structure: while at least any the unique word UW1 in multiple unique word UW1 being detected at switched antenna and by unique word test section 45 in the first stipulated time T1, signal processing part 51 detects the quality of received wireless signal, after antenna being switched by antenna control part 52, in the second stipulated time T2, searched for other unique word UW1 by unique word test section 45, thus, antenna control part 52 is selected the high antenna of signal quality being detected by signal processing part 51, the payload after receiving.
In addition, the present invention can carry out various distortion.For example, also can not calculate the mean value of reception level, and the quality of the signal that reception horizontal detection based on certain time point arrives by each antenna reception.For example, also can based on by each antenna detection to the time point of preamble, from the detection of preamble after the stipulated time or detect that the reception level of the time point of unique word UW1 carrys out detection signal quality.In this case, further alleviate the processing load of signal processing part 51, the i.e. processing load of CPU 5.
In addition, the first stipulated time T1, the second stipulated time T2, the 3rd stipulated time T3, the 4th stipulated time T4 and data receiver time T 5 also can be added respectively some enough and to spare times (margin) to the above-mentioned time and set.This is the problem producing for fear of the clock jitter of following between each terminal.
In addition, except reception level, also can detect according to the bit string of baseband signal the quality of the signal arriving by each antenna reception with respect to error rate of the bit string of pre-stored unique word etc.
In addition, antenna of the present invention switches receiving system 1 and transmitting system 70 is not limited to HEMS 100, also can be widely used in using other wireless system of " switched diversity ".
Claims (9)
1. antenna switches a receiving system, it is characterized in that possessing:
Antenna control part, it controls the switching of multiple antennas;
Bit string test section, it is searched for the wireless signal of selecting a property ground switched antenna while receive, detects unique word; And
Signal quality test section, it detects the quality of the wireless signal received by each antenna,
Wherein, in the time that above-mentioned bit string test section detects any first unique word in multiple the first unique words within the first stipulated time, above-mentioned signal quality test section detects the quality of received wireless signal, wherein, this first unique word is identical with the bit string of predefined unique word or is the bit string below setting with respect to the error rate of the bit string of above-mentioned predefined unique word
After above-mentioned antenna control part switches antenna, above-mentioned bit string test section is searched for other first unique word beyond above-mentioned any first unique word within the second stipulated time, thus above-mentioned signal quality test section to the antenna reception by after switching to the quality of wireless signal detect
Above-mentioned antenna control part is selected the high antenna of signal quality being detected by above-mentioned signal quality test section, the payload after receiving.
2. antenna according to claim 1 switches receiving system, it is characterized in that,
When selected the antenna that above-mentioned signal quality is high at above-mentioned antenna control part after, above-mentioned bit string test section detects second unique word different from above-mentioned the first unique word within the 3rd stipulated time, not switched antenna and be still fixed as antenna that above-mentioned signal quality the is high payload after receiving of above-mentioned antenna control part.
3. antenna according to claim 1 and 2 switches receiving system, it is characterized in that,
Above-mentioned the first stipulated time is equivalent to above-mentioned the first unique word and the time in two cycles of the preamble that received before this first unique word, and above-mentioned the second stipulated time is equivalent to the time more than one-period of above-mentioned the first unique word and above-mentioned preamble.
4. switch receiving system according to the antenna claimed in claim 3 that is subordinated to claim 2, it is characterized in that,
Above-mentioned the 3rd stipulated time is equivalent to by three of above-mentioned preamble and above-mentioned the first unique word the time more than cycle and above-mentioned the second unique word and the time of the one-period of the preamble that received before this second unique word is added time of gained.
5. switch receiving system according to the antenna described in any one in claim 1～4, it is characterized in that,
Also possess detection of preamble portion and Data Detection portion, the header that above-mentioned payload comprises detects in this detection of preamble portion, and the data that above-mentioned payload comprises detect in this Data Detection portion,
In the time that above-mentioned detection of preamble portion can not complete the detection of above-mentioned header within the 4th stipulated time, do not receive the data of payload, and switched antenna again, and revert to the action that is detected above-mentioned the first unique word by above-mentioned bit string test section.
6. antenna according to claim 5 switches receiving system, it is characterized in that,
Also possess time of reception renewal portion, the length that this time of reception renewal portion comprises based on above-mentioned header was upgraded the data receiver time for detection of above-mentioned data,
Can not complete the detection of above-mentioned data in the data receiver time in above-mentioned Data Detection portion after being upgraded by above-mentioned time of reception renewal portion time, switched antenna again, and revert to the action that is detected above-mentioned the first unique word by above-mentioned bit string test section.
7. switch a transmitting system corresponding to receiving system with antenna according to claim 1, it is characterized in that,
Before above-mentioned payload, send above-mentioned multiple the first unique word.
8. switch a transmitting system corresponding to receiving system with antenna according to claim 2, it is characterized in that,
After having sent above-mentioned multiple the first unique word, before above-mentioned payload, send above-mentioned the second unique word.
With switch a transmitting system corresponding to receiving system according to antenna described in claim 3 or 4, it is characterized in that,
Before each first unique word, send above-mentioned preamble.
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| JP2012231916A JP6032543B2 (en) | 2012-10-19 | 2012-10-19 | Antenna switching reception system and corresponding transmission system |
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| JP5842111B2 (en) * | 2010-07-05 | 2016-01-13 | パナソニックＩｐマネジメント株式会社 | Antenna switching reception system |
| WO2012028917A1 (en) * | 2010-08-26 | 2012-03-08 | パナソニック株式会社 | Antenna-switchable reception system and wireless communications device including same |
| CN102457315B (en) * | 2010-10-18 | 2014-12-17 | 瑞昱半导体股份有限公司 | Antenna diversity device and antenna diversity method |
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