CN102868658A - Device and transmission/reception method of figure of package data in mobile communication system - Google Patents

Device and transmission/reception method of figure of package data in mobile communication system Download PDF

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Publication number
CN102868658A
CN102868658A CN2012102781853A CN201210278185A CN102868658A CN 102868658 A CN102868658 A CN 102868658A CN 2012102781853 A CN2012102781853 A CN 2012102781853A CN 201210278185 A CN201210278185 A CN 201210278185A CN 102868658 A CN102868658 A CN 102868658A
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sub
pilot
code element
carrier
carrier power
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CN102868658B (en
Inventor
韩臸奎
裵范植
权桓准
金东熙
金润善
金唯哲
郑丁寿
金大均
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention concerns a device and method of transmission/reception of orthogonal frequency partitioning of signals (OFDM) in a mobile communication system. A transmission processor shapes the modulated figure by means of coding, alternations and modulations of a package of physical level which should be transmitted, and disposes the modulated figure in tone of data. The block of parenthesising of tones interposes the protective tone and a tone of a control signal into the data tone. The block of allocation of power of tone erects the different relation of power of tone of a control signal to power of tone of data depending on an interval position in which the figure of package data is included, and proportions power according to the relation of power of tone of a control signal to power of tone of data, and the transmitter transmits a figure of package data.

Description

The equipment of transmission/receiving packet data symbol and method in mobile communication system
The application is that international filing date is on December 03rd, 2005, application number is that PCT/KR2005/004109(China application number is 200580039018.1), denomination of invention is divided an application for the application for a patent for invention of " being used for equipment and method at mobile communication system transmission/receiving packet data symbol "
Technical field
The present invention relates generally to for equipment and method that broadcast service is provided at radio packet communication system.Particularly, the present invention relates to for equipment and the method for the broadcast system control that is controlled at use Orthodoxy Frequency Division Multiplex (OFDM) transmission plan to the power division of pilot sub-carrier (pilot tone).
Background technology
Traditionally, for receiving at fixed terminal or to be received as target at low data rate portable terminal, and developed for the wireless transmission scheme that the broadcast service such as broadcast and multicast service (BCMCS) is provided.Now, allow user (subscriber) to use small-sized terminals to receive the positive research of technical execution of broadcast service at high-speed mobile environment for being used for.Broadcast technology such as DMB (DMB) and hand-held digital video broadcast (DVB-H) (typical BCMCS technology) has developed into and has allowed the user to receive high-quality broadcasting with the small portable terminal.In addition, DMB and DVB-H technology are studied, so that existing uni-directional broadcast service develops into bidirectional broadcast service.For this reason, considering to use existing wire/wireless communication network as the plan of Return Channel.But, because broadcasting is used different transmission plans with communicating by letter, so the method is realizing having limitation aspect the bidirectional broadcast.
Usually, radio packet communication system is supported in specific transmission user and specifically receives the communication service of exchange message between the user.In this communication service, different reception users is by different channel receiving informations.But owing to the interchannel interference that the isolation of its lower channel and channel causes, radio packet communication system suffers mis-behave.In order to increase the isolation of channel and channel, current mobile communication system is used honeycomb concept and the multiple access (rdma) scheme such as Code Division Multiple Access (CDMA), time-division multiple access (TDMA) (TDMA), frequency division multiple access (FDMA).But, even use these technology, can not remove interference fully.
Different from communication service, the BCMCS service allows to transmit user's uniaxially information is sent to a plurality of reception users.Because they share identical channel, so, between the user who receives identical information, do not disturb.But, because the multipath that in the environment of high-speed mobile, occurs (multipath) decline, so the mobile broadcast service suffers mis-behave.In order to solve (address) this problem, be designed to support that the broadcast system of the mobile reception such as digital video broadcast terrestrial (DVB-T), DVB-H and digital audio broadcasting (DAB) system uses the OFDM transfer scheme.
In broadcast system, use the OFDM transfer scheme can prevent from the multipath fading that causes self-interference.Particularly, in broadcast service, identical broadcast singal is transmitted via Single Frequency Network (SFN) in different base stations.Therefore, the OFDM transfer scheme has following advantage, that is, it can prevent the interference between the broadcast singal that is transmitted by different base station.Therefore, the OFDM transfer scheme is applied to broadcast service can realizes noiseless environment, thereby make contributions for the maximization of communication efficiency.
The down link of HRPD (high rate packet data) (HRPD) mobile communication system uses TDMA as multiple access (rdma) scheme, and uses time division multiplexing/code division multiplex (TDM/CDM) as multiplexing scheme.
Fig. 1 is the figure that is illustrated in time slot (slot) form of the down link in traditional HRPD mobile communication system.
Graphic such as Fig. 1 institute, a time slot has the form that repeats with half time slot.To have N PilotThe pilot tone 103 and 108 of leaf length is inserted in the central authorities of half time slot, and, described pilot tone 103 and 108 channel estimating that are used at the down link of receiving terminal.Transmit at the two ends of pilot tone 103 and 108 comprise uplink power control information and resource allocation information, have a N MACMedia interviews control (MAC) information 102,104,107 and 109 of leaf length.Transmit before MAC information 102,104,107 and 109 and afterwards and have N DataThe actual transmissions data 101,105 of leaf length, 106 and 110.In this way, come pilot tone, MAC information, real data are carried out time division multiplexing by TDM.
By CDM, utilize walsh codes and MAC and data message are carried out multiplexed, and in the HRPD downlink system, the length of pilot tone, MAC and data block is set to N Pilot=96, N MAC=64 and N Data=400.
The figure of Fig. 2 time slot format that to be diagram provide by the transfer of data interval that the OFDM code element is inserted into for the HRPD downlink time slots of BCMCS service.
Compatible for the HRPD down link, the position of pilot tone and MAC signal and size and pilot tone shown in Figure 1 and position and the size of MAC signal are complementary shown in figure 2.Namely, will have N PilotThe pilot tone 103 and 108 of leaf length places the central authorities of half time slot, and will have N MACThe MAC signal 102,104 of leaf length, 107 and 109 places the both sides of pilot signal 103 and 108.Therefore, yet can not estimate channel and receive the MAC signal by pilot tone based on the existing HRPD terminal of the broadcast service of OFDM even do not support.OFDM code element 121,122,123 and 124 is inserted in all the other fields (that is, transfer of data interval 101,105,106 and 110) of time slot.Provide OFDM code element 121,122,123 and 124 by modulation BCMCS information.
At N DataIn=400 the existing HRPD downlink system, the size of OFDM code element is set to N Data=400.The OFDM scheme is arranged in the head of each OFDM code element with Cyclic Prefix (CP), is caused self-interference owing to multipath fading by the reception signal of time delay in order to prevent.Namely, an OFDM code element comprises CP 125 and the OFDM data 126 by the anti-fast fourier transform of BCMCS information and executing (IFFT) is generated.The size of CP 125 is N CPSheet, and, for CP 125, copy N at OFDM data 126 afterbodys CPThen the sheet signal is arranged in it head of OFDM data 126.Therefore, the size of OFDM data 126 becomes (N Data-N CP) sheet.At this, according to the time delay that causes self-interference that allows, determine N CPN CPIncrease increased the number of just demodulated delayed reception signal, and do not disturb, still because the minimizing of OFDM size of data has reduced transmissible amount of information.Yet, N CPMinimizing increased transmissible amount of information, still because high interference possibility in serious multipath fading environments has reduced the quality of reception.
In SFN, because receive the same signal that is transmitted by several terminals at different time in terminal, so the size of CP is set to higher value usually.In the HRPD downlink system that transmits the ofdm signal that is used for the BCMCS service, preferably, with N CPBe set to 80 (N CP=80).In this case, the size of OFDM data becomes 320.This expression can be carried out IFFT to 320 modulated symbols, and transmits the code element after IFFT processes in OFDM transfer of data interval.Therefore, by the OFDM scheme, can obtain altogether 320 subcarriers (tone).
But, be not that whole 320 subcarriers can both be used for transmission of data symbols.Some subcarriers that are positioned at employed band edge should be used as: be used for preventing that out of band signal from becoming the protection subcarrier of interference.Because before transmitting, expand the pilot tone 103 and 108 that (spread) uses at different conveyers with different codes in existing HRPD down link, so, the channel estimating that the BCMCS that they are not suitable for providing in SFN serves.Therefore, additionally need dedicated pilot for the channel estimating of ofdm signal.The part of useful subcarrier is transmitted in predefined signal between conveyer and the receiver, then should be used for channel estimating by predefined signal, and, such subcarrier is called OFDM dedicated pilot subcarrier.The OFDM scheme of using in SFN allows the time delay relatively grown, thereby causes serious frequency-selecting decline (frequency-selective fading).Therefore, even need in the situation of serious frequency-selecting decline, also can guarantee that pilot sub-carrier is enough to carry out channel estimating.
Fig. 3 is the figure that is illustrated in the traditional subcarrier permutation method in the HRPD system.
With reference to figure 3, protection subcarrier 201 is arranged in the edge of frequency band.With the low frequency part of 8 protection subcarrier permutation in 16 protection subcarriers at frequency band, and with the HFS of all the other 8 protection subcarrier permutation at frequency band.Obstructed overprotection subcarrier transmits signal, so, power is not provided to the protection subcarrier.Data subcarrier 203 is arranged in the central authorities of frequency band.At last, because pilot sub-carrier 202 is used for channel estimating, so, arrange pilot sub-carrier 202 with the regular interval of per 5 subcarriers.Arrangement of subcarrier namely, is being followed the pilot sub-carrier that is arranged on the low-limit frequency after four protection subcarriers, and then is being inserted pilot sub-carrier in this way.
Similarly, even in the field of having arranged data subcarrier 203, also insert pilot sub-carrier 202, then, following pilot sub-carrier 202 after four data subcarriers 203, and, new pilot sub-carrier 202 is arranged in after these four data subcarriers 203.In this way, pilot sub-carrier 202 is arranged on the frequency corresponding to direct current (DC) component.Because pilot sub-carrier 202 is DC subcarriers, so, before transmission, do not distribute power or distribute low-power to them to them.
Pilot sub-carrier 202 and data subcarrier 203 are mutually different aspect the power that is assigned with.The power that is assigned to pilot sub-carrier 202 should be by conveyer and receiver predefine to the preferred plan of the ratio of the power that is assigned to data subcarrier 203, and this is because described beguine it is believed that condition and difference.
Fig. 4 is the block diagram that is illustrated in the structure of the traditional conveyer in the HRPD system.
With reference to figure 4, conveyer comprises for the channel encoder 301 that the grouped data that receives is carried out chnnel coding, be used for channel interleaver 302 that the grouped data to coding interweaves, be used for the grouped data that modulation interweaves modulator 303, be used for inserting the protection subcarrier inserter 304 of protection subcarrier and the pilot sub-carrier inserter 305 that is used for inserting pilot sub-carrier.In addition, conveyer comprises sub-carrier power distributor 306, quaternary PSK (QPSK) expander (spreader) 307, IFFT unit 308, CP inserter 309, and HRPD compatible processor 310.
The physical layer packet data that will generate in the upper strata are input to channel encoder 301.Channel encoder 301 is encoded to the bit stream of chnnel coding with this Packet Data Channel, and the bit stream of this chnnel coding is outputed to channel interleaver 302.Channel interleaver 302 interweaves the bit stream (or to its carry out column permutation (column permutation)) of this chnnel coding obtaining diversity gain, and the bit stream that will interweave outputs to modulator 303.The bit stream that modulator 303 will interweave is modulated to modulation signal.This modulation signal is arranged in the data subcarrier 203.
Protection subcarrier inserter 304 will be arranged in the protection subcarrier 201 that is arranged in band edge from the signal of modulator 303 outputs; and pilot sub-carrier inserter 305 is arranged in pilot sub-carrier 202 from the signal of protection subcarrier inserter 304 outputs with regular interval.Afterwards, sub-carrier power distributor 306 distributes power according to the ratio R of the power that is assigned to pilot sub-carrier to the power that is assigned to data subcarrier.In QPSK expander 307, after being assigned to whole subcarriers, signal transmission is carried out the QPSK expansion.In the QPSK extension process, will multiply by different multiple pseudo noise (PN) sequences be used to the base station signal that transmits different BCMCS contents.Multiple PN sequence represents that real component and imaginary component all comprise the complex sequences of PN code.
Because on receiver, undesired base station signal may become noise component(s), so receiver can be carried out the channel estimating of separating with undesirable base station to channel.Identifier according to the BCMCS content of inputting is created on the multiple PN sequence of using in the QPSK extension process.
In IFFT unit 308, process by IFFT and at the modulation signal of the positional alignment QPSK expansion of the frequency sub-carrier of hope.Afterwards, CP inserter 309 is inserting CP from the signal of IFFT unit 308 output, in order to prevent the self-interference that causes owing to multipath fading, thereby finishes the generation of OFDM signal transmission.Afterwards, HRPD compatible processor 310 continues to carry out the HRPD transmission process, to insert pilot tone 103 and 108 and MAC information 102,104,107 and 109.The final signal that transmits has shown in figure 2 time slot format.
By with reference to figure 5A and Fig. 5 B, will be made in now the description of the form that transmits OFDM BCMCS time slot between the CDM time slot.Fig. 5 A is the figure that is illustrated in the form that transmits OFDM BCMCS time slot between the CDM time slot.Here, this CDM time slot has time slot format shown in Figure 1, and, in its data field, comprise the signal that CDM is multiplexed.OFDM BCMCS time slot has shown in figure 2 time slot format.
By with reference to figure 5A, will make now the description to the channel estimation process of each the OFDM code element on the terminal that receives the OFDM BCMCS time slot 402 that transmits between CDM time slot 401 and 403.
OFDM BCMCS time slot 402 comprises 4 OFDM code elements 121,122,123 and 124 wherein. Reference numeral 121 and 124 indications are positioned at the OFDM code element of time slot edge, and Reference numeral 122 and 123 indications are positioned at the OFDM code element of time slot central authorities.
Usually, because the length of OFDM code element is defined as so that channel can not changed in the OFDM code element, so the channel-changing between adjacent OFDM code element is not remarkable.Therefore, the OFDM code element that is positioned at time slot central authorities can be used the pilot sub-carrier of edge OFDM code element, in order to estimate channel.For example, the not only pilot sub-carrier of OFDM code element 122, and OFDM code element 121 and 123 pilot sub-carrier are used to the channel of estimating OFDM code element 122, thereby improve channel estimating performance.
Yet in channel estimation process, the OFDM code element that is arranged in time slot edge has limitation at the pilot sub-carrier that uses adjacent OFDM code element.More specifically, the pilot sub-carrier that is used for the channel of estimating OFDM code element 121 comprises the pilot sub-carrier of OFDM code element 121 and the pilot sub-carrier of OFDM code element 122.This be because: owing to before the transmission of OFDM code element 121, transmitted CDM time slot rather than BCMCS time slot, so there is not pilot sub-carrier will be used to Signal estimation.Therefore, the OFDM code element 122 and 123 that is positioned at OFDM BCMCS time slot central authorities is better than being positioned at the OFDM code element 121 and 124 of OFDM BCMCS time slot edge aspect channel estimating performance.This be because, do not consider the position of OFDM code element, the power that identical value is used for being assigned to independent pilot sub-carrier is to the ratio R of the power of the power that is assigned to independent data subcarrier.
As a result, compare with the OFDM code element that is positioned at OFDM BCMCS time slot central authorities, the OFDM code element that is positioned at time slot edge has the higher reception mistake possibility during the transfer of data of occurring in.
As shown in Fig. 5 B, even when OFDM BCMCS time slot transmits continuously, this phenomenon also can occur.Reference numeral 405,406 all represents the OFDM BCMCS time slot that transmits different broadcast messages with 407.The terminal that receives the broadcast message of OFDM BCMCS time slot 406 does not need to receive OFDM BCMCS time slot 405 and 407.Therefore, even in the situation that transmits continuously OFDM BCMCS time slot, receive wrong possibility still can according to the OFDM code element the position and not identical.
Summary of the invention
Therefore, an object of the present invention is, be provided for improving equipment and method based on the receptivity in the HRPD mobile communication system of OFDM transmission plan.
Another object of the present invention is to be provided for regulating and distributing according to the position of OFDM code element in based on the HRPD mobile communication system of OFDM transmission plan equipment and the method for the power of pilot sub-carrier.
According to an exemplary aspect of the present invention, provide the equipment that transmits packet data symbol in HRPD (high rate packet data) (HRPD) mobile communication system that is used for broadcast service.This equipment comprises transmission processor, is used for by coding, interweaves and modulate the physical layer packet that will transmit, and generate the code element of modulation, and arrange the code element of modulating in data subcarrier; The subcarrier inserter is used for protecting subcarrier and pilot sub-carrier to be inserted into data subcarrier; The sub-carrier power distributor is used for different pilot being set according to the sub-carrier power ratio according to the position of time slot, and distributes power according to pilot according to the sub-carrier power ratio, wherein, comprises packet data symbol in described time slot; And conveyer, be used for transmitting packet data symbol.
According to an exemplary aspect of the present invention, provide the equipment that in mobile communication system, transmits Orthodoxy Frequency Division Multiplex (OFDM) code element.This equipment comprises: transmission processor is used for by coding, interweaves and modulate the code element that the physical layer packet that will transmit generates modulation, and arrange the code element of modulating in the data subcarrier of OFDM code element; The subcarrier inserter is used for pilot sub-carrier is inserted into the OFDM code element; The sub-carrier power distributor is used for different pilot being set according to the sub-carrier power ratio according to the position of time slot OFDM code element, and distributes power according to pilot according to the sub-carrier power ratio; And conveyer, be used for transmitting the OFDM code element.
According to another exemplary aspect of the present invention, provide the method that transmits packet data symbol in HRPD (high rate packet data) (HRPD) mobile communication system that is used for broadcast service.The method may further comprise the steps: by coding, interweave and modulate the physical layer packet that will transmit, and generate the code element of modulation, and arrange the code element of modulating in data subcarrier; To protect subcarrier and pilot sub-carrier to be inserted in the data subcarrier; Position according to time slot arranges different pilot according to the sub-carrier power ratio, and distributes power according to pilot according to the sub-carrier power ratio, wherein, comprises packet data symbol in described time slot; And transmission packet data symbol.
According to another exemplary aspect of the present invention, provide the method that in mobile communication system, transmits Orthodoxy Frequency Division Multiplex (OFDM) code element.The method may further comprise the steps: by coding, interweave and modulate the code element that the physical layer packet that will transmit generates modulation, and arrange the code element of modulating in the data subcarrier of OFDM code element; Pilot sub-carrier is inserted in the OFDM code element; Position according to OFDM code element in the time slot arranges different pilot according to the sub-carrier power ratio, and distributes power according to pilot according to the sub-carrier power ratio; And transmission OFDM code element.
According to another exemplary aspect of the present invention, provide the method at HRPD (high rate packet data) (HRPD) the mobile communication system receiving packet data symbol that is used for broadcast service.The method may further comprise the steps: receiving about according to the position of transmitting packet data symbol and definite pilot during according to the information of sub-carrier power ratio, storage according to the pilot of element position according to the sub-carrier power ratio; If the grouping that receives is Orthodoxy Frequency Division Multiplex (OFDM) grouping, then extract data symbols from this OFDM grouping, and the data symbols extracted of despreading (despread), thereby extract data subcarrier and pilot sub-carrier; Use the pilot of OFDM grouping according to the sub-carrier power ratio, estimate channel; And use channel estimating information, recover data from data subcarrier.
According to another exemplary aspect of the present invention, provide the method for receiving orthogonal frequency division multiplexing (OFDM) code element in mobile communication system.The method may further comprise the steps: receiving about according to the position of OFDM code element and definite pilot during according to the information of sub-carrier power ratio, the storage pilot is according to the sub-carrier power ratio; Receive the OFDM code element, remove Cyclic Prefix, the time-domain signal of inputting is converted to frequency-region signal, and extract data subcarrier and pilot sub-carrier; Pilot sub-carrier and pilot with the OFDM code element are estimated channel according to the sub-carrier power ratio; And use channel estimating demodulates information data subcarrier, the signal of institute's demodulation is deinterleaved, and the signal that deinterleaves of decoding, thereby recover data.
According to another exemplary aspect of the present invention, provide the equipment at HRPD (high rate packet data) (HRPD) the mobile communication system receiving packet data symbol that is used for broadcast service.This equipment comprises: channel estimating unit, be used for receiving control message, and extract pilot according to the position of packet data symbol according to the sub-carrier power ratio, determine the channel estimating weighting, and estimate channel according to pilot according to the sub-carrier power ratio; Orthodoxy Frequency Division Multiplex (OFDM) processor is used for the OFDM code element that receives is divided into pilot sub-carrier and data subcarrier, and pilot sub-carrier is provided to channel estimating unit, and the output data subcarrier; And data recovery unit, be used for using the channel estimating information that provides from channel estimating unit, recover the information that transmits from data subcarrier.
According to another exemplary aspect of the present invention, provide the equipment of receiving orthogonal frequency division multiplexing (OFDM) code element in mobile communication system.This equipment comprises: receiving element, be used for receiving control message, and from control message, extract pilot according to the position of OFDM code element according to the sub-carrier power ratio; The OFDM processor is used for the OFDM code element is processed, and it comprises: the Cyclic Prefix remover is used for removing Cyclic Prefix; Fft processor is used for the time-domain signal of input is converted to frequency-region signal; The pilot sub-carrier extractor is used for extracting pilot sub-carrier, and pilot sub-carrier is provided to channel estimating unit; With the data subcarrier extractor, be used for extracting data subcarrier, and the output data subcarrier; Channel estimating unit is used for using pilot sub-carrier and pilot according to sub-carrier power Ratio Estimation channel; And data recovery unit, it comprises: demodulator, be used for to use the channel estimation value that provides from channel estimating unit and the demodulating data subcarrier; Deinterleaver is used for the signal of institute's demodulation is deinterleaved; And decoder, be used for the signal that decoding deinterleaves.
Description of drawings
When by reference to the accompanying drawings from the description of lower mask body, above and other illustrative purpose of the present invention, feature and advantage will become clearer, in the accompanying drawings, will understand, identical Reference numeral represents identical part, element and structure, wherein:
Fig. 1 is the figure that is illustrated in the time slot format of the down link in traditional HRPD mobile communication system;
The figure of Fig. 2 time slot format that to be diagram provide by the transfer of data interval that the OFDM code element is inserted into for the HRPD downlink time slots of BCMCS service;
Fig. 3 is the figure that is illustrated in the traditional subcarrier permutation method in the HRPD system;
Fig. 4 is the block diagram that is illustrated in the structure of the traditional conveyer in the HRPD system;
Fig. 5 A is the figure that is illustrated in the form that transmits OFDM BCMCS time slot between the CDM time slot;
Fig. 5 B is the figure that is illustrated in the form that transmits OFDM BCMCS time slot between the OFDM BCMCS time slot;
Fig. 6 is diagram according to exemplary embodiment of the present invention, at the block diagram of the structure of the HRPD system conveyer that is used for broadcast service;
Fig. 7 is diagram according to exemplary embodiment of the present invention, at the flow chart of the operation of the conveyer of the HRPD system that is used for broadcast service;
Fig. 8 is diagram according to exemplary embodiment of the present invention, at the flow chart of the operation of the receiver of the HRPD system that is used for broadcast service;
Fig. 9 is the figure that is illustrated in the exemplary time slot format that transmits continuously OFDM BCMCS time slot between the CDM time slot;
Figure 10 is diagram according to another exemplary embodiment of the present invention, at the flow chart of the operation of the conveyer of the HRPD system that is used for broadcast service;
Figure 11 is diagram according to another exemplary embodiment of the present invention, at the flow chart of the operation of the receiver of the HRPD system that is used for broadcast service;
Figure 12 be diagram according to an embodiment of the invention, be used for to receive the block diagram of structure that position according to the OFDM code element arranges the receiver of the ofdm signal that conveyer transmits after the different power ratios; And
Figure 13 A and Figure 13 B be diagram according to an embodiment of the invention, the receiver in the HRPD system receives the flow chart of the processing of ofdm signal.
Embodiment
Now, specifically describe several exemplary embodiment of the present invention with reference to accompanying drawing.In the accompanying drawings, as already pointed out, even in different accompanying drawings, describe them, also represent identical or close element by identical Reference numeral.In the following description, for clarity and conciseness for the purpose of, omitted in the known function of this merging and the specific descriptions of configuration.
Use can with the system of the OFDM transmission plan of HRPD compatibility in, may not transmit continuously the BCMCS time slot.Therefore, channel estimating performance depends on whether the OFDM code element is positioned at time slot edge or time slot central authorities.The OFDM code element that is positioned at time slot edge aspect channel estimating performance inferior to the OFDM code element that is positioned at time slot central authorities.Namely, because do not consider that power that the position of OFDM code element, identical value be used for being assigned to independent pilot sub-carrier is to the ratio R of the power of the power that is assigned to independent data subcarrier, so the wrong possibility that is positioned at the OFDM code element of time slot edge increases.
Therefore, exemplary embodiment of the present invention provides the method that regulates and distributes the power of pilot sub-carrier according to the position of time slot, thereby has improved receiving ability.
Usually, the increase of the power of pilot sub-carrier improves channel estimating performance.But, because define overall transmission power as pilot sub-carrier power and data subcarrier power, so the increase of pilot sub-carrier power causes the minimizing of data subcarrier power.The minimizing of data subcarrier power causes the increase of wrong possibility in data decode is processed.Therefore, for given overall transmission power, need to be assigned to the power of pilot sub-carrier and be assigned to compromise between the power of data subcarrier.
In operation, should in the transmission/reception interval, be predefined in the power ratio R_Side of the OFDM code element use that is positioned at time slot edge and the power ratio R_Center that uses in the OFDM code element that is positioned at time slot central authorities.For power ratio R_Side and R_Center, terminal can be used their initial value or this value of notifying from the base station before receiving the BCMCS time slot.Namely, because best R_Side and R_Center value be according to channel conditions and different, so, in transmission/reception these values of predefine in the time period.In the rapid fading environment, because use the channel estimating of the pilot sub-carrier execution of in another code element, using to show low reliability, so preferably R_Side and R_Center are set to higher as much as possible value.
Fig. 6 is diagram according to exemplary embodiment of the present invention, at the block diagram of the structure of the HRPD system conveyer that is used for broadcast service.
Conveyer comprises for the channel encoder 301 that the grouped data that receives is carried out chnnel coding, be used for channel interleaver 302 that the grouped data to coding interweaves, be used for the grouped data that modulation interweaves modulator 303, be used for protect subcarrier to be inserted into from the protection subcarrier inserter 304 of the signal of modulator 303 outputs, and the pilot sub-carrier inserter 305 that is used for pilot sub-carrier is inserted the signal of exporting from protection subcarrier inserter 304.In addition, conveyer comprises sub-carrier power distributor 606, QPSK expander 307, IFFT unit 308, CP inserter 309, and HRPD compatible processor 310.
The operation of conveyer is described particularly referring now to Fig. 6.
The physical layer packet data that will generate in the upper strata are input to channel encoder 301.Channel encoder 301 is encoded to the bit stream of chnnel coding with this Packet Data Channel, and the bit stream of this chnnel coding is outputed to channel interleaver 302.The interweave bit stream (or to its carry out rank transformation) of this chnnel coding of channel interleaver 302, realizing diversity gain, and the bit stream that will interweave outputs to modulator 303.The bit stream that modulator 303 will interweave is modulated to modulation signal.This modulation signal is arranged in the data subcarrier 203.
Protection subcarrier inserter 304 will be arranged in the protection subcarrier 201 that is arranged in band edge from the signal of modulator 303 outputs; and pilot sub-carrier inserter 305 is arranged in pilot sub-carrier 202 from the signal of protection subcarrier inserter 304 outputs with regular interval.
Afterwards, sub-carrier power distributor 606 regulates and distributes the power of pilot sub-carrier according to the element position (namely, whether corresponding OFDM code element is positioned at time slot edge or time slot central authorities) of correspondence.This more specifically describes with reference to Fig. 5 A.For the OFDM code element 121 and 124 that is positioned at time slot edge, divide the power that is used in pilot sub-carrier and data subcarrier with power ratio R_Side.For the OFDM code element 122 and 123 that is positioned at time slot central authorities, distribute the power of pilot sub-carrier and data subcarrier with power ratio R_Center.As mentioned above, in exemplary realization, predefine R_Side and R_Center value.
In QPSK expander 307, after being assigned to whole subcarriers, signal transmission is carried out the QPSK expansion.IFFT unit 308 is processed by IFFT and arrange the modulation signal of QPSK expansion in the position of the frequency sub-carrier of hope.Afterwards, CP inserter 309 is inserting CP from the signal of IFFT unit 308 outputs, thereby finishes the generation of OFDM signal transmission.
Exemplary embodiment of the present invention arranges variable pilot according to sub-carrier power ratio (that is, variable pilot sub-carrier power is to the ratio of data sub-carrier power) according to the position of OFDM code element.But replacedly, the ad-hoc location that also can be the OFDM code element arranges fixing power ratio.According to exemplary embodiment of the present invention, because may not can transmit the OFDM code element at whole time slots, so the HRPD system uses variable power ratio and revocable power ratio.
Revocable power ratio in order to use variable power ratio, the base station will be sent to about the information based on the power ratio of the position of OFDM code element uses the signaling message that is used for supporting the BCMCS service in the HRPD system (for example, air broadcast (BroadcastOverhead) message) terminal is to notify current pilot according to the sub-carrier power ratio to terminal.
For pilot being set changeably according to the sub-carrier power ratio, can consider following two exemplary embodiments.
In first embodiment, the base station provides to terminal has the indication pilot according to the information of sub-carrier power ratio, and the time slot that usually transmits therein the OFDM code element provides this pilot according to the sub-carrier power ratio.The form of signaling message of the terminal of the general power ratio of notice in first embodiment of using the base station has been shown in table 1.
Table 1
Figure BDA00001980020200121
Table 1 only shows the field of using in exemplary embodiment of the present invention, and has omitted other field that is used for supporting the BCMCS service.To be configured to indicate two types the pilot of code element according to the sub-carrier power ratio at the signaling message shown in the table 1.Suppose to transmit 4 OFDM code elements at 1 time slot, so, the HRPD system can indicate pilot for each OFDM code element according to the sub-carrier power ratio.But, because the property class of two code elements that are positioned at time slot central authorities and two code elements that are positioned at time slot edge is seemingly, so pilot is indicated as the load that can reduce signaling message according to the sub-carrier power ratio.Below will be described in each field of the signaling message shown in the table 1.
" DualPDREnabled " field has indicated whether to use two types the pilot sub-carrier power of code element to the ratio (double pilot is to data sub-carrier power ratio (two PDR(Dual PDR)) of data sub-carrier power).If this field value is set to " 1 ", then two PDR have been used in its expression.But if this field value is set to " 0 ", then expression has only used the pilot of the code element that is used for a type according to the sub-carrier power ratio.
" EBCMCSTransmissionFormat " field indication transformat.If the highest significant position of this field (MSB) is set to " 0 ", then the transformat of not supporting variable format has been used in expression.But if the MSB of this field is set to " 1 ", then the transformat of supporting variable format has been used in expression.When transmitting a plurality of time slot, variable format allows each independent time slot to transmit the OFDM code element with other form.According to exemplary embodiment of the present invention, will be the size of CP, the number of pilot sub-carrier and the number of protection subcarrier for the formal definition of the OFDM code element of variable format.Namely, when supporting variable format, may transmit the OFDM code element for each independent time slot, wherein, CP, pilot sub-carrier and the protection subcarrier that will all have different sizes (or length) are applied to described OFDM code element.Therefore, the suitable PDR value of independent time slot may be different.When reason is supported variable format for this reason, different PDR values need to be set before or after change of format.
" DCPilotToDataGain " field indication DC pilot sub-carrier power is to the ratio (that is, the DC pilot is according to the sub-carrier power ratio) of data sub-carrier power.In first exemplary embodiment of the present invention, because hypothesis only is applied to two PDR interchange (AC) pilot sub-carrier, so, define single DCPILOTTODATAGAIN value.
Whether logic channel corresponding to " DualPDREnabledForThisLogicalChannel " field indication comprises two PDR.If this field value is set to " 1 ", then corresponding logic channel uses two PDR, and its indication will define field about two PDR by this field.But if this field value is set to " 0 ", then logic channel corresponding to expression do not use two PDR.
" ACPilotToDataGainRecord " field indication AC pilot sub-carrier power is to the ratio (that is, the AC pilot is according to the sub-carrier power ratio) of data sub-carrier power.If " DualPDREnabledForThisLogicalChannel " field is set to " 0 ", then two PDR are not used in indication, to represent " ACPilotToDataGainRecord " field at the form shown in table 2A or the table 2B.
Table 2A
Field Length (bit)
ACPilotToDataGain N
Table 2B
Field Length (bit)
ACPilotToDataGain1 N
ACPilotToDataGain2 N
Table 2A shows AC pilot for the situation of not using variable format according to the sub-carrier power ratio, and table 2B shows AC pilot for the situation of using variable format according to the sub-carrier power ratio.
Table 2A shows when " DualPDREnabledForThisLogicalChannel " field and is set to MSB in " 0 " and " EBCMCSTransmissionFormat " field when being set to " 0 ", when namely not using two PDR and variable format, how to represent " ACPilotToDataGainRecord " field." ACPilotToDataGain " field indication AC pilot is according to the sub-carrier power ratio, and do not consider the position of corresponding code element and be identical value with " ACPilotToDataGain " Field Definition.
Table 2B shows when " DualPDREnabledForThisLogicalChannel " field and is set to MSB in " 0 " and " EBCMCSTransmissionFormat " field when being set to " 1 ", when namely having used variable format less than using two PDR, how to represent " ACPilotToDataGainRecord " field." ACPilotToDataGain1 " field indication before transformat changes the AC pilot according to the sub-carrier power ratio, and " ACPilotToDataGain2 " field indication after transformat changes the AC pilot according to the sub-carrier power ratio, and do not consider correspondence code element the position and be identical value with " ACPilotToDataGain2 " Field Definition.
If " DualPDREnabledForThisLogicalChannel " field is set to " 1 ", thereby two PDR are used in indication, then to represent " ACPilotToDataGainRecord " field at the form shown in table 2C or the 2D.
Table 2C
Field Length (bit)
ACInternalPilotToDataGain N
ACBoundaryPilotToDataGain N
Table 2D
Field Length (bit)
ACInternalPilotToDataGain1 N
ACBoundaryPilotToDataGain1 N
ACInternalPilotToDataGain2 N
ACBoundaryPilotToDataGain2 N
Table 2C shows AC pilot for the situation of not using variable format according to the sub-carrier power ratio, and table 2D shows AC pilot for the situation of using variable format according to the sub-carrier power ratio.
Table 2C shows when " DualPDREnabledForThisLogicalChannel " field and is set to MSB in " 1 " and " EBCMCSTransmissionFormat " field when being set to " 0 ", namely use two PDR and when not using variable format, how to represent " ACPilotToDataGainRecord " field." ACInternalPilotToDataGain " field comprises the pilot of central code element of the OFDM code element that transmits at a time slot for transmission according to the value of sub-carrier power ratio, and " ACBoundaryPilotToDataGain " field comprises that the pilot of edge code element of the OFDM code element that transmits at a time slot for transmission is according to the value of sub-carrier power ratio.
Table 2D shows when " DualPDREnabledForThisLogicalChannel " field and is set to MSB in " 1 " and " EBCMCSTransmissionFormat " field when being set to " 1 ", when namely using two PDR and variable format, how to represent " ACPilotToDataGainRecord " field.The pilot of central code element that " ACInternalPilotToDataGain1 " field and " ACBoundaryPilotToDataGain1 " field comprise respectively the OFDM code element that transmits at a time slot for transmission according to the value of sub-carrier power ratio and the pilot of edge code element that is used for the OFDM code element that transmission transmits at a time slot according to the value of sub-carrier power ratio, and before transformat changes, be used.
The pilot of central code element that " ACInternalPilotToDataGain2 " field and " ACBoundaryPilotToDataGain2 " field comprise respectively the OFDM code element that transmits at a time slot for transmission according to the value of sub-carrier power ratio and the pilot of edge code element that is used for the OFDM code element that transmission transmits at a time slot according to the value of sub-carrier power ratio, and after transformat changes, be used.
In second exemplary embodiment, the base station provides to terminal has the indication pilot according to the information of sub-carrier power ratio, wherein, interweaves separately for each at the time slot that transmits the OFDM code element and to use described pilot according to the sub-carrier power ratio.HRPD system with the operation of 4 time slot interleaving transmission plans can use only one or a plurality of interweaving for the transmission of OFDM code element.Therefore, between OFDM code element transmission period, the HRPD system can arrange different pilot according to the sub-carrier power ratio for each interweaves separately.
The form of the signaling message that uses the base station in second embodiment has been shown in table 3, and it is in order to be used for each variable pilot that interweaves separately according to the sub-carrier power ratio to the terminal notice between OFDM code element transmission period.
Table 3
Figure BDA00001980020200151
Figure BDA00001980020200161
Table 3 only shows for the field at embodiments of the invention, and has omitted other for the field of supporting the BCMCS service.To be configured to comprise that the pilot of indicating the code element that is used for two types is according to the sub-carrier power ratio at the signaling message shown in the table 3.
Signaling message can comprise that the pilot that is used to indicate each code element is according to the field of sub-carrier power ratio.But as shown in table 3, signaling message comprises the pilot of the code element that is used to indicate two types according to the field of sub-carrier power ratio, in order to reduce the load of signaling message.
To specifically describe below now each field of the signaling message shown in the table 3.
" PilotToneToDataTonePowerRatioIncluded " field has indicated whether to comprise the value of pilot sub-carrier to data sub-carrier power ratio.If this field value is set to " 0 ", then expression does not comprise pilot sub-carrier to data sub-carrier power ratio, and uses default value.But if this field value is set to " 1 ", then expression has comprised that the pilot sub-carrier that uses is to data sub-carrier power ratio between the transmission period of whole OFDM code elements.
" InterlaceXIncluded " field has indicated whether to comprise will use " X " that interweaves and the information that transmits.Here, X represents 0,1,2 or 3.If this field value is set to " 0 ", then expression does not comprise transmission information, and if this field value is set to " 1 ", then expression comprises transmission information.
" the pilot sub-carrier power of the central code element that CenterSymbolsPTDTPRX(transmits in the X time slot that interweaves is to data sub-carrier power ratio, wherein X=0,1,2 or 3) " field comprises for a time slot that comprises at Interlace X and transmits the pilot of transmission of the central code element among the OFDM code element according to the sub-carrier power rate value.Only be set to " 1 " and " InterlaceXIncluded " field when being set to " 1 " when " PilotToneToDataTonePowerRatioIncluded " field, just comprise " CenterSymbolsPTDTPRX " field.
" the pilot sub-carrier power of the limit code element that SideSymbolsPTDTPRX(transmits in the X time slot that interweaves is to the ratio of data sub-carrier power, wherein X=0,1,2 or 3) " field indication is used for transmission and transmits the pilot of the code element (side symbols) on the limit in the OFDM code element according to the sub-carrier power rate value at the time slot that Interlace X comprises.Only be set to " 1 " and " InterlaceXIncluded " field when being set to " 1 " when " PilotToneToDataTonePowerRatioIncluded " field, just comprise " SideSymbolsPTDTPRX " field.
Be used to indicate pilot according to the value of sub-carrier power ratio at table 1 to the N shown in the table 3.Can dB represent this value or can be to its coding before transmission, and its resolution can be depending on the size of N.
With reference to figure 7, with make according to exemplary embodiment of the present invention, to be used for position according to the OFDM code element be that transmission time slot is set different pilot according to the sub-carrier power rate value so that can use the specific descriptions of operation of conveyer of the value of constant power ratio on the position of specific OFDM code element always.
Fig. 7 is diagram according to exemplary embodiment of the present invention, at the flow chart of the operation of the conveyer of the HRPD system that is used for broadcast service.In exemplary embodiment of the present invention, be called the base station at the conveyer of the HRPD system that is used for broadcast service.
In step 701, conveyer uses channel encoder 301, channel interleaver 302 and modulator 303, according to the broadcast data that will transmit and the generated data subcarrier.In step 702, will protect subcarrier to be inserted in the data subcarrier, and, in step 703, pilot sub-carrier is inserted in the data subcarrier that inserts the protection subcarrier.In step 704, conveyer determines that corresponding OFDM code element is positioned at the central authorities of time slot or the edge of time slot.If determine that the OFDM code element is positioned at time slot edge, then in step 705, conveyer is according to power ratio R_Side and with power division to pilot sub-carrier and data subcarrier.But if determine that the OFDM code element is positioned at time slot central authorities, then in step 706, conveyer is according to power ratio R_Center and with power division to pilot sub-carrier and data subcarrier.
Afterwards, in step 707, conveyer uses QPSK expander 307, carries out different QPSK expansions according to the BCMCS content designator.In step 708, conveyer uses IFFT unit 308 to carry out IFFT and processes, and uses CP inserter 309 that CP is inserted in the code element after IFFT processes, thereby finishes ofdm signal.Afterwards, conveyer uses HRPD compatible processor 310 to carry out the HRPD compatible processing in step 709, and transmits the ofdm signal of finishing in step 710.
With reference to figure 8, recover the description of the exemplary process of broadcast singal in the time of will making now the ofdm signal that generates when the operation that receives by Fig. 7, at receiver.
Fig. 8 is diagram according to exemplary embodiment of the present invention, at the flow chart of the operation of the receiver of the HRPD system that is used for broadcast service.In exemplary embodiment of the present invention, be called terminal at the receiver of the HRPD system that is used for broadcast service.
In step 801, receiver receives R_Side and the R_Center value from base station or conveyer.When receiving the failure of R_Side and R_Center value, receiver uses initial R_Side and R_Center value.When receiving the BCMCS time slot, receiver extracts the OFDM code element from the BCMCS time slot that receives in step 802, and in step 803 the OFDM code element of extracting is carried out the QPSK despreading.
Afterwards, in step 804, receiver is carried out channel estimating, and whether definite OFDM code element is positioned at time slot edge.If the OFDM code element that receives is positioned at time slot edge, then receiver advances to step 805, and wherein, it carries out channel estimating according to pilot according to sub-carrier power ratio R _ Side.
But if determine that the OFDM code element is positioned at time slot central authorities, then receiver advances to step 806, and wherein, it carries out channel estimating according to pilot according to sub-carrier power ratio R _ Center.In the channel estimation process of step 805 and 806, receiver uses the pilot sub-carrier that is positioned at adjacent OFDM code element.In step 807, receiver extracts data subcarrier from estimated channel, and the data subcarrier that extracts of demodulation.In step 808, the receiver the most at last data subcarrier of demodulation is decoded as the broadcast singal that transmits from conveyer.
Hypothesis has 4 OFDM code elements in a time slot in Fig. 7 and Fig. 8.But, even change the number of OFDM code element, also can use in the same manner above method.In this case, the pilot that can be positioned at the OFDM code element of time slot edge is set to R_Side according to the sub-carrier power ratio, and the pilot that can be positioned at all the other OFDM code elements of time slot central authorities is set to R_Center according to the sub-carrier power ratio.
Now, another exemplary embodiment of the present invention will be described below briefly.In this exemplary embodiment of describing with reference to figure 5 to Fig. 8, suppose that an OFDM BCMCS time slot has the CDM time slot that at least one is adjacent.But, when the OFDM time slot has a CDM time slot that is adjacent, can be only be set to R_Side for the pilot of the OFDM code element that is arranged in the OFDM time slot that is close to the CDM time slot according to the sub-carrier power ratio.
Fig. 9 is the figure that diagram is used for transmitting continuously the exemplary time slot format of OFDM BCMCS time slot.Reference numeral 412 and 413 expressions are used for transmitting the OFDM BCMCS time slot of identical broadcasts information, and receiver receives OFDM BCMCS time slot 412 and 413.But the BCMCS receiver does not receive CDM time slot 411 and 414.In this case, in the channel estimation process of demodulating ofdm code element 124, the BCMCS receiver can use the OFDM code element of OFDM BCMCS time slot 413.In exemplary embodiment of the present invention, although OFDM code element 121 and 124 all is positioned at time slot edge, should distribute power according to the sub-carrier power ratio to them according to different pilot.
In order to solve possible in this case problem, exemplary embodiment of the present invention provides the position that is used to OFDM code element independent in the time slot and different pilot has been set according to the method for the expansion of sub-carrier power ratio.
Show the form of the signaling message that is used to indicate power ratio at table 4.
Table 4
Field Length (bit)
[...] [...]
PilotToneToDataTonePowerRatioIncluded 1
[...] [...]
Interlace0Included 1
FirstSymbolsPTDTPR0 0 or N
SecondSymbolsPTDTPR0 0 or N
ThirdSymbolsPTDTPR0 0 or N
FourthSymbolsPTDTPR0 0 or N
[...] [...]
Interlace1Included 1
FirstSymbolsPTDTPR1 0 or N
SecondSymbolsPTDTPR1 0 or N
ThirdSymbolsPTDTPR1 0 or N
FourthSymbolsPTDTPR1 0 or N
[...] [...]
Interlace2Included 1
FirstSymbolsPTDTPR2 0 or N
SecondSymbolsPTDTPR2 0 or N
ThirdSymbolsPTDTPR2 0 or N
FourthSymbolsPTDTPR2 0 or N
[...] [...]
Interlace3Included 1
FirstSymbolsPTDTPR3 0 or N
SecondSymbolsPTDTPR3 0 or N
ThirdSymbolsPTDTPR3 0 or N
FourthSymbolsPTDTPR3 0 or N
[...] [...]
Table 4 shows the field that only is used for embodiments of the invention, and has omitted other for the field of supporting the BCMCS service.To specifically describe below now each field of the signaling message shown in the table 4.
" PilotToneToDataTonePowerRatioIncluded " field has indicated whether to comprise the value of pilot sub-carrier to data sub-carrier power ratio.If this field value is set to " 0 ", then expression does not comprise pilot sub-carrier to data sub-carrier power ratio, and has used the default value of initial setting up.But if this field value is set to " 1 ", then expression has comprised in the pilot of all using between OFDM code element transmission period according to the sub-carrier power ratio.
" InterlaceXIncluded " field has indicated whether to comprise will use " X " time slot that interweaves and the information that transmits.Here, X represents 0,1,2 or 3.If this field value is set to " 0 ", then expression does not comprise transmission information, and if this field value is set to " 1 ", then expression comprises transmission information.
" pilot sub-carrier of the first code element that FirstSymbolsPTDTPRX(transmits in the X time slot that interweaves is to the ratio of data sub-carrier power; X=0,1,2 or 3 wherein) " field comprises for the pilot of first code element (for example, the OFDM code element 121 of Fig. 9) of the time slot of the correspondence of transmission among the OFDM code element that a time slot the transmits value according to the sub-carrier power ratio.Only be set to " 1 " and " InterlaceXIncluded " field when being set to " 1 " when " PilotToneToDataTonePowerRatioIncluded " field, just comprise " FirstSymbolsPTDTPRX " field.
" pilot sub-carrier of the second code element that SecondSymbolsPTDTPRX(transmits in the X time slot that interweaves is to the ratio of data sub-carrier power; X=0,1,2 or 3 wherein) " field comprises for the pilot of second code element (for example, the OFDM code element 122 of Fig. 9) of the time slot of the correspondence of transmission among the OFDM code element that a time slot the transmits value according to the sub-carrier power ratio.Only be set to just comprise when " 1 " and " InterlaceXIncluded " field is set to " 1 " " SecondSymbolsPTDTPRX " field when " PilotToneToDataTonePowerRatioIncluded " field.
" pilot sub-carrier of the third yard unit that ThirdSymbolsPTDTPRX(transmits in the X time slot that interweaves is to the ratio of data sub-carrier power; X=0,1,2 or 3 wherein) " field comprises for the pilot of the third yard unit (for example, the OFDM code element 123 of Fig. 9) of the time slot of the correspondence of transmission among the OFDM code element that a time slot the transmits value according to the sub-carrier power ratio.Only be set to " 1 " and " InterlaceXIncluded " field when being set to " 1 " when " PilotToneToDataTonePowerRatioIncluded " field, just comprise " ThirdSymbolsPTDTPRX " field.
" pilot sub-carrier of the 4th code element that FourthSymbolsPTDTPRX(transmits in the X time slot that interweaves is to the ratio of data sub-carrier power; X=0,1,2 or 3 wherein) " field comprises for the pilot of the 4th code element (for example, the OFDM code element 124 of Fig. 9) of the time slot of the correspondence of transmission among the OFDM code element that a time slot the transmits value according to the sub-carrier power ratio.Only be set to just comprise when " 1 " and " InterlaceXIncluded " field is set to " 1 " " FourthSymbolsPTDTPRX " field when " PilotToneToDataTonePowerRatioIncluded " field.
Figure 10 is diagram according to another exemplary embodiment of the present invention, at the flow chart of the operation of the conveyer of the HRPD system that is used for broadcast service, in this embodiment, conveyer is for the independent position of OFDM code element and use different pilot according to the sub-carrier power ratio.In exemplary embodiment of the present invention, be called the base station at the conveyer of the HRPD system that is used for broadcast service.
In step 10, conveyer uses channel encoder 301, channel interleaver 302 and modulator 303, according to the broadcast data that will transmit and the generated data subcarrier.In step 11, conveyer will protect subcarrier to be inserted in the data subcarrier, and, in step 12, pilot sub-carrier is inserted in the data subcarrier that inserts the protection subcarrier.
In step 13, conveyer determines whether corresponding OFDM code element is positioned at the primary importance of time slot.If the OFDM code element is an OFDM code element of time slot, then in step 14, conveyer is according to power ratio R_1 and with power division to pilot sub-carrier and data subcarrier.Otherwise in step 15, conveyer determines whether the OFDM code element is positioned at the second place of time slot.If the OFDM code element is the 2nd OFDM code element of time slot, then in step 16, conveyer is according to power ratio R_2 and with power division to pilot sub-carrier and data subcarrier.Otherwise in step 17, conveyer determines whether the OFDM code element is positioned at the 3rd position of time slot.If the OFDM code element is the 3rd OFDM code element of time slot, then in step 18, conveyer is according to power ratio R_3 and with power division to pilot sub-carrier and data subcarrier.Otherwise, because its indication OFDM code element is positioned at the rearmost position of time slot, so in step 19, conveyer is according to power ratio R_4 and with power division to pilot sub-carrier and data subcarrier.
Afterwards, in step 20, conveyer is according to the BCMCS content designator, carry out different QPSK expansion with QPSK expander 307.In step 21, conveyer uses IFFT unit 308 to carry out IFFT and processes, and, use CP inserter 309 that CP is inserted in the code element after IFFT processes, thereby finish ofdm signal.Afterwards, conveyer uses HRPD compatible processor 310 to carry out the HRPD compatible processing in step 22, and transmits the ofdm signal of finishing in step 23.
With reference to Figure 11, recover the description of the processing of broadcast singal in the time of will making now the ofdm signal that generates when the operation that receives by Figure 10 at receiver.
Figure 11 is diagram according to another exemplary embodiment of the present invention, at the flow chart of the operation of the receiver of the HRPD system that is used for broadcast service, in this embodiment, receiver is for the independent position of OFDM code element and use different pilot according to the sub-carrier power ratio.In exemplary embodiment of the present invention, be called terminal at the receiver of the HRPD system that is used for broadcast service.
In step 30, receiver from the base station or conveyer receive R_1, R_2, R_3 and R_4.When receiving R_1, R_2, R_3 and R_4 failure, receiver uses initial R_1, R_2, R_3 and R_4 value.When receiving the BCMCS time slot, receiver extracts the OFDM code element from the BCMCS time slot that receives in step 31, and in step 32 the OFDM code element of extracting is carried out the QPSK despreading.
In step 33, receiver determines whether the OFDM code element is positioned at the primary importance of time slot.If the OFDM code element is an OFDM code element of time slot, then in the step 34, receiver is being carried out channel estimating according to pilot according to sub-carrier power ratio R _ 1.Otherwise in step 35, receiver determines whether the OFDM code element is positioned at the second place of time slot.If the OFDM code element is the 2nd OFDM code element of time slot, then in step 36, receiver is carried out channel estimating according to pilot according to sub-carrier power ratio R _ 2.Otherwise in step 37, receiver determines whether the OFDM code element is positioned at the 3rd position of time slot.If the OFDM code element is the 3rd OFDM code element of time slot, then in step 38, receiver is carried out channel estimating according to pilot according to sub-carrier power ratio R _ 3.Otherwise, because its indication OFDM code element is positioned at the rearmost position of time slot, so in step 39, receiver is carried out channel estimating according to pilot according to sub-carrier power ratio R _ 4.In step 34,36,38 and 39 channel estimation process, receiver uses the pilot sub-carrier that is arranged in adjacent OFDM code element.
In step 40, receiver extracts data subcarrier from estimated channel, and the data subcarrier that extracts of demodulation.In step 41, the receiver the most at last data subcarrier of demodulation is decoded as the broadcast singal that transmits from conveyer.
As mentioned above, conveyer arranges different power ratios according to the position of the OFDM code element in the ofdm signal time slot that transmits.When receiving ofdm signal, receiver comes ofdm signal is carried out channel estimating according to the power ratio of correspondence, thereby improves the channel estimating performance of OFDM code element.
Figure 12 be diagram according to an embodiment of the invention, be used for being received in the block diagram of structure that position according to the OFDM code element arranges the receiver of the ofdm signal that conveyer transmits after the different power ratios.With reference to Figure 12, will make according to an embodiment of the invention now, be used for being received in position according to the OFDM code element structure of receiver of the ofdm signal that conveyer transmits after the different power ratios and the description of operation will be set.
Receiver can with the HRPD technical compatibility.Therefore, the compatible receiving processor 71 of HRPD receives the HRPD signal, is mapped to the part signal of data from the HRPD signal extraction that receives, and determines that the data that receive are OFDM data or CDM data.In the situation of broadcast service, whether the compatible receiving processor 71 of HRPD can have the value " 1 " of indication broadcast service by checking MSB, and definite data transfer scheme that receives.
As mentioned above, in the HRPD system, receiver can be received in the broadcast singal that each time slot of OFDM is transmitted by conveyer, perhaps, is received in clean culture (unicast) signal or control signal that each time slot is transmitted by CDM by conveyer.At first, receive the control signal of CDM transmission in order to detect pilot according to the description of the method for sub-carrier power ratio with being made in receiver.When receiving from the control signal of HRPD system or power ratio signal, the compatible receiving processor 71 of HRPD outputs to power ratio message receiver 72 with the signal that receives.Power ratio message receiver 72 extracts power ratio message from the CDM control signal, and will output to according to the power ratio value that the power ratio message of extracting is selected channel estimating weight decisions device 73.Here, term " power ratio " indication pilot is according to the sub-carrier power ratio.
Channel estimating weight decisions device 73 uses the power ratio value, determines the weighting of needed each the independent channel of channel estimating, and the channel estimating weighting of determining is outputed to channel estimator 78.
The description of the method for the signal that next, the OFDM that is made in the receiver reception is transmitted.The signal that OFDM is transmitted is input to OFDM processor 1200.Now, the data management that is described in the OFDM processor 1200 is processed.
OFDM processor 1200 is provided to CP remover 74 with the ofdm signal that receives, to remove the CP from the ofdm signal that is received.CP remover 74 is removed and is damaged the CP of (contaminate) owing to propagation delay with from the multidiameter of received signal, and the signal that will remove CP outputs to fast Fourier transform (FFT) processor 75.Fft processor 75 is converted to frequency-region signal with the time-domain signal of input, and this frequency-region signal is outputed to QPSK despreader 76.76 pairs of described frequency-region signals of QPSK despreader carry out the QPSK despreading, and the signal of QPSK despreading is outputed to pilot sub-carrier extractor 77.The reason that 76 pairs of described frequency-region signals of QPSK despreader carry out the QPSK despreading is: before transmission, conveyer has carried out the QPSK expansion to signal transmission.As shown in Figure 3, based on mixing, QPSK despreader 76 output protection subcarriers, pilot sub-carrier and data subcarrier.Pilot sub-carrier extractor 77 extracts pilot sub-carrier from the QPSK despread signal, the pilot sub-carrier that extracts is outputed to channel estimator 78, and all the other subcarriers are outputed to data subcarrier extractor 79.Data subcarrier extractor 79 only is extracted in the subcarrier that is mapped to data among the subcarrier of pilot sub-carrier extractor 77 output, and the data subcarrier that extracts is outputed to demodulator 80.
To be input to channel estimator 78 by the pilot sub-carrier that pilot sub-carrier extractor 77 extracts.Channel estimator 78 usefulness are estimated channel by the 73 determined channel estimating weightings of channel estimating weight decisions device.
After channel estimating, channel estimator 78 outputs to demodulator 80 with the channel value of estimating.The estimated channel value of demodulator 80 usefulness comes the demodulating data subcarrier, and the signal of demodulation is outputed to deinterleaver 81.Deinterleaver 81 restituted signal that deinterleaves, and the signal that deinterleaves outputed to decoder 82.Decoder 82 decoding deinterleaves signal, thereby the signal that recovery transmits, the broadcast singal that for example transmits.
Figure 13 A and Figure 13 B be diagram according to an embodiment of the invention, in the HRPD system, receive the flow chart of the processing of ofdm signal at receiver.With reference to figure 13A and Figure 13 B, will make now to according to an embodiment of the invention, receive the specific descriptions of the processing of ofdm signal at the receiver of HRPD system.
With reference to figure 13A and Figure 13 B, in step 51, receiver received power ratio message.According to transmission method, receiver receives this power ratio message in a different manner.When receiving power ratio message, receiver is determined the channel value of estimation with power ratio message receiver 72, channel estimating weight decisions device 73 and channel estimator 78.In step 52, receiver reads the DCPilotToDataRatio field from the power ratio message that receives, and storage DC pilot is according to the sub-carrier power ratio.In this case, the receiver storage power information and being used for that is used for being positioned at the pilot sub-carrier in the time slot outside of transmitting the OFDM code element is positioned at the power information of pilot sub-carrier and the data subcarrier of time slot inboard.Afterwards, in step 53, receiver determines whether the MSB of the EBCMCSTransmissionFormat field in the message that receives is set to " 1 ", if this MSB is set to " 1 ", then receiver advances to step 54.Otherwise receiver advances to step 55.
In step 55, receiver determines whether the value of DualPDREnabledForThisLogicalCh field is set to " 1 ", if the value of DualPDREnabledForThisLogicalCh field is set to " 1 ", then receiver advances to step 62.Otherwise receiver advances to step 61.In step 62, do not consider the order of time slot and read ACPilotToDataRatioOuterSymbols field and ACPilotToDataRatioInnerSymbols field, and, store the AC pilot according to the sub-carrier power ratio in inner OFDM code element and outside OFDM code element.In step 61, receiver is not considered the order of time slot and the position in the time slot, and reads the ACPilotToDataRatio field, and storage AC pilot is according to the sub-carrier power ratio.
In step 54, receiver determines whether the value of DualPDREnabledForThisLogicalCh field is set to " 1 ", is set to " 1 " if determine the value of DualPDREnabledForThisLogicalCh field, and then receiver advances to step 64.Otherwise receiver advances to step 63.
In step 64, receiver reads for the ACPilotToDataRatioOuterSymbols1 field and the ACPilotToDataRatioInnerSymbols1 field that change transformat time slot before, and, store the AC pilot according to the sub-carrier power ratio in inner OFDM code element and outside OFDM code element.In addition, receiver is used for changing ACPilotToDataRatioOuterSymbols2 field and the ACPilotToDataRatioInnerSymbols2 field of transformat time slot afterwards, and, store the AC pilot according to the sub-carrier power ratio in inner OFDM code element and outside OFDM code element.
In step 63, do not consider the position of OFDM code element in the time slot, and read ACPilotToDataRatio1 field and ACPilotToDataRatio2 field, and the time slot after the time slot before transformat changes and transformat change is respectively stored the AC pilot according to the sub-carrier power ratio.
After step 61,62,63 or 64, in step 65, the receiving symbol of receiver storage pilot sub-carrier.Afterwards, in step 66, determine channel estimating weighting according to sub-carrier power ratio and AC pilot according to the sub-carrier power ratio according to the DC pilot.In step 67, receiver uses the channel estimating weighting, by being combined the receiving symbol that inserts pilot sub-carrier, the channel that comes the data estimator subcarrier to experience.In step 68, receiver uses the channel value of estimating, recovers broadcast singal by the data subcarrier is carried out the demodulation code.
As understanding according to foregoing description, set different pilot according to the sub-carrier power ratio from the BCMCS transmission equipment based on OFDM of HRPD technical compatibility according to the position of OFDM code element, thereby improve the channel estimating performance of the OFDM code element that is positioned at time slot edge.The improvement of channel estimating performance is contributed to some extent to the improvement of receptivity.
Although illustrated and described the present invention in conjunction with some embodiment, it will be apparent to one skilled in the art that and to make therein the various changes in form and the details and do not deviate from the in the appended claims the spirit and scope of the present invention of definition.For example, although to the system applies of the OFDM transmission plan of BCMCS technical support and HRPD technical compatibility wherein exemplary embodiment of the present invention, also can be to other broadcast system Application Example based on OFDM.

Claims (20)

1. equipment that in mobile communication system, transmits Orthodoxy Frequency Division Multiplex (OFDM) code element, this equipment comprises:
Transmission processor is used for by coding, interweaves and modulate the code element that the physical layer packet that will transmit generates modulation, and arrange the code element of modulating in the data subcarrier of OFDM code element;
The subcarrier inserter is used for pilot sub-carrier is inserted into the OFDM code element;
The sub-carrier power distributor is used for different pilot being set according to the sub-carrier power ratio according to the position of time slot OFDM code element, and distributes power according to pilot according to the sub-carrier power ratio; And
Conveyer is used for transmitting the OFDM code element.
2. equipment as claimed in claim 1, wherein, if the OFDM code element is positioned at the outside of time slot, then the sub-carrier power distributor arrives pilot sub-carrier and data subcarrier according to the sub-carrier power ratio with power division according to the first pilot, and, if the OFDM code element is positioned at the inboard of time slot, then the sub-carrier power distributor arrives pilot sub-carrier and data subcarrier according to the sub-carrier power ratio with power division according to the second pilot.
3. equipment as claimed in claim 1, wherein, the sub-carrier power distributor arranges different pilot according to the sub-carrier power ratio according to the position of OFDM code element in the time slot, and passes through signaling message and transmit pilot according to the sub-carrier power rate information.
4. equipment as claimed in claim 3, wherein, signaling message comprises about the information of direct current pilot according to the sub-carrier power ratio.
5. equipment as claimed in claim 3, wherein, signaling message comprise indicate whether to comprise pilot according to the field of sub-carrier power rate information, comprise for transmission in the pilot of the inside OFDM code element that described time slot transmits according to the field of sub-carrier power rate information and the pilot that comprises the outside OFDM code element that transmits at described time slot for transmission according in the field of sub-carrier power rate information at least one.
6. equipment as claimed in claim 3, wherein, signaling message comprises: about between the transmission period of OFDM code element, use different pilot according to the pilot of the sub-carrier power ratio information according to the sub-carrier power ratio for each interweaves separately.
7. equipment as claimed in claim 3, wherein, signaling message comprises: indicate whether to comprise that pilot is according to the field of sub-carrier power rate information, indicate whether separately to comprise the field of the information that will use each time slot that interweaves and transmit, comprise separately for the pilot of the transmission of the inside OFDM code element that transmits in the described time slot that comprises that interweaves at each field according to the sub-carrier power rate information, and comprise separately for the pilot of the transmission of the outside OFDM code element that transmits in the described time slot that comprises that interweaves at each according in the field of sub-carrier power rate information at least one.
8. equipment as claimed in claim 1, wherein, the sub-carrier power distributor between the transmission period of OFDM code element, for each interweave separately provide different pilot according to the sub-carrier power ratio.
9. method that in mobile communication system, transmits Orthodoxy Frequency Division Multiplex (OFDM) code element, the method may further comprise the steps:
By coding, interweave and modulate the code element that the physical layer packet that will transmit generates modulation, and in the data subcarrier of OFDM code element, arrange the code element of modulating;
Pilot sub-carrier is inserted in the OFDM code element;
Position according to OFDM code element in the time slot arranges different pilot according to the sub-carrier power ratio, and distributes power according to pilot according to the sub-carrier power ratio; And
Transmit the OFDM code element.
10. method as claimed in claim 9, wherein, the sub-carrier power allocation step is further comprising the steps of: if the OFDM code element is positioned at the outside of time slot, then according to the sub-carrier power ratio power division is arrived pilot sub-carrier and data subcarrier according to the first pilot, and, if the OFDM code element is positioned at the inboard of time slot, then according to the sub-carrier power ratio power division is arrived pilot sub-carrier and data subcarrier according to the second pilot.
11. method as claimed in claim 9 is further comprising the steps of: the position according to OFDM code element in the time slot arranges different pilot according to the sub-carrier power ratio, and passes through signaling message and transmit pilot according to the sub-carrier power rate information.
12. method as claimed in claim 11, wherein, signaling message comprises about the information of direct current pilot according to the sub-carrier power ratio.
13. method as claimed in claim 11, wherein, signaling message comprise indicate whether to comprise pilot according to the field of sub-carrier power rate information, comprise for transmission in the pilot of the inside OFDM code element that described time slot transmits according to the field of sub-carrier power rate information and the pilot that comprises the outside OFDM code element that transmits at described time slot for transmission according in the field of sub-carrier power rate information at least one.
14. method as claimed in claim 11, wherein, signaling message comprises: about between the transmission period of OFDM code element, use different pilot according to the pilot of the sub-carrier power ratio information according to the sub-carrier power ratio for each interweaves separately.
15. method as claimed in claim 11, wherein, signaling message comprises: indicate whether to comprise that pilot is according to the field of sub-carrier power rate information, indicate whether separately to comprise the field of the information that will use each time slot that interweaves and transmit, comprise separately for the pilot of the transmission of the inside OFDM code element that transmits in the described time slot that comprises that interweaves at each field according to the sub-carrier power rate information, and comprise separately for the pilot of the transmission of the outside OFDM code element that transmits in the described time slot that comprises that interweaves at each according in the field of sub-carrier power rate information at least one.
16. method as claimed in claim 9, wherein, between the transmission period of OFDM code element, for each interweave separately provide different pilot according to the sub-carrier power ratio.
17. the method for receiving orthogonal frequency division multiplexing (OFDM) code element in mobile communication system, the method may further comprise the steps:
Receiving about according to the position of OFDM code element and definite pilot during according to the information of sub-carrier power ratio, the storage pilot is according to the sub-carrier power ratio;
Receive the OFDM code element, remove Cyclic Prefix, the time-domain signal of inputting is converted to frequency-region signal, and extract data subcarrier and pilot sub-carrier;
Pilot sub-carrier and pilot with the OFDM code element are estimated channel according to the sub-carrier power ratio; And
Use channel estimating demodulates information data subcarrier, the signal of institute's demodulation is deinterleaved, and the signal that deinterleaves of decoding, thereby data recovered.
18. method as claimed in claim 17, wherein, channel estimation steps may further comprise the steps: if the OFDM code element is positioned at the outside of time slot, then according to the first pilot according to sub-carrier power Ratio Estimation channel, and, if the OFDM code element is positioned at the inboard of time slot, then according to the second pilot according to sub-carrier power Ratio Estimation channel.
19. the equipment of receiving orthogonal frequency division multiplexing (OFDM) code element in mobile communication system, this equipment comprises:
Receiving element is used for receiving control message, extracts pilot according to the position of OFDM code element according to the sub-carrier power ratio from control message;
The OFDM processor is used for the OFDM code element is processed, and it comprises:
The Cyclic Prefix remover is used for removing Cyclic Prefix;
Fft processor is used for the time-domain signal of input is converted to frequency-region signal;
The pilot sub-carrier extractor is used for extracting pilot sub-carrier, and pilot sub-carrier is provided to channel estimating unit; With
The data subcarrier extractor is used for extracting data subcarrier, and the output data subcarrier;
Channel estimating unit is used for using pilot sub-carrier and pilot according to sub-carrier power Ratio Estimation channel; And
Data recovery unit, it comprises:
Demodulator be used for to use the channel estimation value that provides from channel estimating unit and the demodulating data subcarrier;
Deinterleaver is used for the signal of institute's demodulation is deinterleaved; With
Decoder is used for the signal that decoding deinterleaves.
20. equipment as claimed in claim 19, wherein, channel estimating unit comprises:
Channel estimating weight decisions device is used for determining the channel estimating weighting according to the output of receiving element; And
Channel estimator is used for receive channel and estimates the weighted sum pilot sub-carrier, and the value of determining channel estimating according to position and the power of pilot sub-carrier.
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