WO2006043717A1 - データブロック拡散形スペクトル拡散通信方式 - Google Patents
データブロック拡散形スペクトル拡散通信方式 Download PDFInfo
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- WO2006043717A1 WO2006043717A1 PCT/JP2005/019737 JP2005019737W WO2006043717A1 WO 2006043717 A1 WO2006043717 A1 WO 2006043717A1 JP 2005019737 W JP2005019737 W JP 2005019737W WO 2006043717 A1 WO2006043717 A1 WO 2006043717A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J13/22—Allocation of codes with a zero correlation zone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/7097—Direct sequence modulation interference
- H04B2201/709709—Methods of preventing interference
Definitions
- the present invention eliminates or reduces white noise mixed in the transmission process and interference noise generated by the receiver in the signal separation process of the maneuver, and further improves the frequency utilization efficiency and reduces the power bandwidth product.
- Code division multiplex communication system using spread spectrum modulation (0 for CDMA) This is an example of a mobile communication system transmitter / receiver modulation / demodulation technique that applies spread spectrum modulation to a signal. Describes the user separation technology of the receiver.
- Spectral spread communication uses a technology that generates a transmission signal by modulating a spread sequence with transmission data. With this spread modulation, the spectrum of the relatively narrow bandwidth of the data is spread over a wide frequency band, and this spread signal is transmitted. There are a plurality of users in an area (cell or sector) where a single base station (S) supplies communication services. In this method, the transmission power per unit frequency is small, and interference to other communications can be reduced to a relatively low level, and white noise (
- Figure 16 shows a general configuration of a transmitter / receiver used for uplink transmission in a mobile communication system that performs direct spread spectrum spread communication (DS-SS) via a wireless channel.
- DS-SS direct spread spectrum spread communication
- Transmitter 7X fc obtains binary phase modulation PSin output "3 ⁇ 4 P by modulating transmission binary data 3 ⁇ 4 and modulates the spread sequence by ,: Generates an output s ° t that is a spectrum spread of the signal, modulates the carrier wave to generate a signal output in the radio frequency band, and sends it out via the radio communication path.
- PN pseudo-noise
- the base station receiver RX receives the received multiplexed signal r consisting of the spectrum spread modulation signal received from all users via the antenna, demodulates r by the local carrier wave, and outputs the baseband!
- a pilot response obtained by multiplying the spreading sequence c fc by the channel characteristic between the transmitter and receiver is generated in advance in the pipe response memory, and is added to the matching filter F t that matches this response. As a result, a soft output is generated.
- Switch S shown in the figure is used by PRM to receive pilot signals in a time-sharing manner.
- This soft output is compared with the threshold value by the hard discriminator C, and binary received data is detected (correlation demodulation).
- This detection data is added to the synchronization circuit SYNC, and the pilot response generation timing is controlled so that the component of the transmission signal in the received multiplexed signal r and the phase of ⁇ are synchronized.
- the product functions of N and ⁇ are exchanged. It is often done.
- the receiver described above has a separate matched filter arranged in parallel to detect each user signal.
- the cross-correlation value between users of the pipe response ⁇ ⁇ ⁇ ⁇ affected by the multipath channel between the transmitter and receiver increases more than the value between the spreading sequences.
- the multipath delayed wave also causes inter-symbol interference due to adjacent symbols of the local station and other stations. As a result, the number of user stations cannot be increased compared to the length (processing gain) of the 10 rows of the spreading system, and the frequency utilization efficiency cannot be increased.
- the method (P-1) is a method in which the function of the matched filter for detecting the data of the user 3 ⁇ 4 is enhanced in the method described in Fig. 16 and using the receiver of the interference cancellation method shown in Fig. 17. Yes.
- the matched filter bank MFB is sending data estimated value of all users other than the first ( Soft output) ⁇ ⁇ is generated.
- ⁇ ⁇ is used to generate a pseudo-input, and ⁇ ⁇ is subtracted from r 1 to generate a soft output, which is hard-decided to obtain a decision value, and the corresponding pseudo-input ⁇ in / -G £ N 2 3 ⁇ 41 is generated.
- calibration canceller IC- 2 subtracted [Phi Eta from the received input r 1, and generates an input r 2 of the second stage.
- IC- 2 repeats the same operations on r 2.
- Figure 18 (a) shows a functional block diagram of the multiuser receiver corresponding to the method (P_2).
- the user's transmitter communicates with the decorator detector ( ⁇ £>, Decorrelating Detec- tor) shown in the figure, and the symbol of the symbol is transmitted, for example, in a time division manner. 'Send to the frame and send.
- the receiver is a pilot for each user. And a high-accuracy pilot response between all users and the receiver (convolution product of transmission spread sequence and channel gain characteristics) P fe is always prepared in RM.
- the transmission symbol is an extended symbol obtained by multiplying the guard sequence with the guard sequence added to the guard sequence and the transmission data, and the receiver receives only the component (core symbol) received in the period corresponding to the core sequence. Is extracted as r in the figure.
- the receiving core symbol r is the transmission data of 3 ⁇ 4,
- the method (P — 3) is a least square error detector shown in Figure 18 (b).
- MMSE- Dr Minimum Mean Square Error Detector This is a method of generating a separation equation in the same way as the above method, obtaining the soft output of the transmission data by the analysis circuit ⁇ , and detecting this.
- the MMSE-D method adds an additional term to P in order to increase the regularity of the matrix P and suppress the AWGN multiplication effect that occurs in the analysis process. This method brings about an improvement effect that minimizes the sum of errors due to interference noise and AWGN noise.
- P-2 it is difficult to increase the data transmission rate.
- the method (P-3) is a multi-input multi-output (MIMO) type mano-reducer receiving system that uses received outputs obtained from multiple receiving antennas, together with the user separation function of the MMS method. Including technology related to communication functions.
- MIMO multi-input multi-output
- This is a method for obtaining a high degree of space-time diversity effect by using multiple transmitting and receiving antennas.
- a concatenated receive vector of N; ⁇ chips is generated.
- a connected pilot response is generated in advance using the pilot response received from each user via each antenna, and the above-mentioned connected reception is performed using the pilot response matrix generated using these responses.
- a chip spreading sequence is assigned to each user, and each user's transmitter generates a repeating sequence by repeating this spreading sequence N times. Multiple M-bit transmission data and one pie are generated. This repetitive sequence is modulated by the lot information to generate (+1) baseband symbols. By simultaneously adding (M + 1) orthogonal carriers assigned to each user and the output modulated by this baseband symbol, a transmission (multiplex) symbol is generated and transmitted. (This is equivalent to the transmission of data blocks.) Each symbol above consisting of repetitive components has a comb-like spectrum, so if each user uses a carrier with a different orthogonal frequency, the receiver will By demodulating with a carrier wave, it is possible to separate M signal components (separation of in-user components).
- Demodulated multiple core symbol is obtained. Separation between users can be realized by using the decorator of the method (P_2) for this symbol.
- P_2 the decorator of the method
- each user's pilot symbol is transmitted in a time-sharing manner using the same orthogonal carrier wave, and the overhead of pilot transmission is relatively small.
- each symbol includes guard sequences.
- Each user transmitter adds (M + 1) symbols and transmits.
- the transmission peak power is (+ 1) 2 times that of the single symbol transmission method. Therefore, the method (P_4) has problems in terms of power increase and frequency utilization efficiency.
- M-chip soft output ⁇ contains inter-bit interference components.
- P-2 the channel characteristics between each user and the base station are used to perform interference separation using the method (P-2) and method ( ⁇ _3). Detect data.
- the system (P-6) is a shift orthogonal sequence of length N by a detabbed block in which user 3 ⁇ 4 consists of M bits.
- the receiver of the base station generates a demodulated signal r by demodulating the received multiplexed signal arriving from the user with the local carrier under the synchronization condition, as shown in FIG.
- the straight outbred column C fc 1 chip right shift the illustrated delayed wave for sequence (sequence without the first chips) of C fc own this signal r Multiplying the main wave series (series excluding the last chip) and multiplying them (E-4)
- the family size of the shift orthogonal sequence set is (N-1) / 2, so the number of accommodated users is
- this core symbol has a comb-like spectrum
- a multiplexed symbol 3 ⁇ 4 obtained by modulating a carrier having a different orthogonal frequency previously allocated to each user by the symbol is transmitted, it is received.
- the machine can obtain a demodulated output that does not contain other user components. That is, complete user separation can be realized.
- the user-separated demodulated output vector uses the number of spread sequences and the channel characteristics generated by the receiver in advance, and uses the method (P _ 2) and method (P — 3) to separate the individual sequence components. Since it can be separated, M transmission data can be detected.
- each transmitter in the method (P-7) simultaneously adds M spread sequences to create a transmission multiplex sequence, so the transmission peak power is the transmission power of the method that transmits one spread sequence.
- M is 2 times.
- the intra-cell user separation function is lost due to a slight synchronization deviation of user signals in uplink transmission.
- the intra-cell user separation function is lost when a scramble sequence is used due to interblock interference due to delayed waves.
- there are problems such as lack of means for realizing multi-rate transmission while maintaining the user separation function. Disclosure of the invention
- the present invention solves the incomplete user signal separation function of the interference canceller of the method (P-1) by providing a new multi-user receiver configuration technology.
- Decorrelator, multi-user receivers such as method (P1-3) detection, and guard sequences to be added to each symbol carrying one bit used in the method (P — 4) iterative sequence multiplexing method The frequency due to the guard sequence of the method (P_5) that uses a data block repetition symbol with a guard that adds a guard sequence to each data block is avoided.
- the present invention solves the problem of insufficient improvement of demodulation SNJ: ⁇ using conventional methods such as ⁇ type and ⁇ double array using a plurality of receiving antennas. This was done in order to establish an optimization technique for improving the signal-to-noise ratio using the extra dimensions of the signal.
- each user's transmitter has a spectrum unique to each user with respect to a data block consisting of a time series force of a plurality of transmission data.
- a block spread symbol is generated and transmitted.
- the receiver receives a large number of transmission signals transmitted by all users in the same manner as reception multiplexed signals, and obtains the channel characteristics between the transmitter and the transmitter acquired in advance and the spread spectrum processing unique to each user.
- the transmitter of the th user transmits the data.
- the second orthogonal carrier is modulated by a guarded data block repetition sequence, so that Is generated as a transmission signal, and the receiver
- the received multiplexed signal is demodulated from the quadrature carrier wave / "to generate a demodulated output, and a data block is generated on the core signal on the core block spreading symbol period excluding the guard part of the recovered m output.
- the demodulated data block corresponding to the one-tuple block transmitted by the second user is generated by removing the other user signal components, and the demodulated data
- a soft output obtained by separating the transmission data of the transmission completion table block is obtained, and a means for making a hard decision on the soft output is provided. It was characterized by detecting data.
- Claim 2 is that each user's transmitter convolves a transmission data block consisting of a time series of multiple transmissions 7 "with a spread sequence assigned to the user. To generate a book spread symbol, transmit the block spread symbol as a transmission signal using a carrier wave common to the user, and the receiver A spectrum that receives a large number of transmitted signals as received multiplexed signals, and uses the received multiplexed signals and the spread sequence to separate and detect all the user signals and separate transmitted data.
- the transmitter of the one adds a guard sequence to a data block spread signal generated by using the second spreading sequence ⁇ belonging to the mouth correlation domain sequence set to the spreading sequence.
- a means for generating a transmission signal by modulating the common carrier with the guarded symbol uses the carrier to generate the received multiplexed signal.
- a demodulated demodulated output is generated, a demodulated core signal is generated by removing the guard from the demodulated output, and the demodulated core signal is added to the matched filter matched to the ⁇ th spreading sequence ⁇ and is reversed in block units.
- a means for separating and generating a demodulated data block corresponding to a data block transmitted by the first user by spreading and averaging, excluding other user signal components, and the demodulated data block Between transmitter and receiver By using the channel characteristics, a soft output obtained by separating the transmission data of the transmission data block is obtained, and a means for making a hard decision on the soft output is provided, thereby detecting the transmission data. It is characterized by and.
- Claim 3 assigns one zero correlation region sequence and one right-shift sequence of the sequence to users, respectively, and the transmitter of each user uses the respective transmission data blocks to transmit the respective sequences.
- the transmitter of the th user in claim 1 generates a guarded symbol by adding a guard sequence after repeating a data block of length M N times, and The transmitter repeats the data tab of length M / «N times, then adds a guard sequence to generate guarded symbols, and k, ' Means for generating transmission signals having different transmission rates by modulating the respective orthogonal carriers, and the receiver obtains the received core signal obtained by removing the guard portion from the received multiplexed signal, Multi-rate transmission can be realized by providing a means for demodulating each by orthogonal carriers and separating and generating demodulated data blocks corresponding to the transmitted signal of the kth user for each user. It was a feature.
- Baseband multistage block spread symbols by assigning the sequences to which each user's transmitter is sequentially spread by the method of convolution and multiplying the transmitted data blocks by these assigned sequences And a means for modulating and transmitting a carrier wave by a guarded symbol obtained by adding a guard sequence to the spread symbol, and the receiver demodulates the received multiplexed signal by the carrier wave to generate the baseband signal.
- a reception core signal is generated, and for each core transmission, A transmission device similarly generated using different zero correlation region sequences belonging to the sequence set by sequentially performing despreading in units of blocks using the spreading sequences used in each spreading layer. It is characterized by multiplex transmission of signals at different transmission rates by providing means for separating and generating demodulated data blocks that do not contain the demodulation component corresponding to the signal.
- the transmitter of the user belonging to the above group includes means for modulating the quadrature carrier wave by the guarded data block repetition sequence, and the receiver has antenna numbers 1, 2,. ), And the received multiplexed signal received via the e-th antenna is demodulated by a second orthogonal carrier to generate a demodulated output, and the guard portion of the demodulated output is removed.
- the demodulated multiplex data A concatenated demodulation vector is generated by concatenating E of the locks, and an expanded channel matrix generated from ⁇ ⁇ channel characteristics between each user of the th user group and the receiver antenna, and a concatenated demodulation vector.
- the soft output vector is obtained by solving the multi-dimensional linear simultaneous equations composed of unknown vectors representing the transmission data of the vector and ⁇ users, and each component of the soft output vector is determined hard. It is characterized by obtaining transmission data of each user belonging to each group.
- a means for separately generating a demodulated multiplex vector corresponding to the data block transmitted by the second user group and a unit of the demodulated multiplex vectors are concatenated.
- Link deconvolution vector and receive with each user belonging to the th user group. Solves the multiple simultaneous linear equations composed of the expanded channel matrix generated from ⁇ channel characteristics between transmitter antennas, the connected demodulation vector, and the unknown vector representing the ⁇ user's transmission data.
- Claim 8 is characterized in that a vehicle absence output vector is obtained by means of the above, and each transmission data is obtained by providing a stage for making a hard decision on each component of the soft output vector.
- the transmitter belonging to each cell may transmit the data block repetition sequence or the data block spreading signal on the cell-specific core block spreading frequency assigned in advance to the cell.
- a core signal comprising: a baseband guarded symbol obtained by adding a guard system ⁇ U to the core signal to generate a transmission signal by modulating the carrier wave according to any one of claims 1 to 6.
- the receiver With hand to send The receiver generates a demodulated core signal on the timing synchronized with the transmission core block spreading period specific to the cell, using the received multiplexed signal and the general wave used by the transmitter.
- the demodulation core signal By processing according to the method described in claim 16, a demodulated data block in which inter-cell interference components are suppressed is generated.
- the transmitter belonging to each cell in S claim terms 1 to 7 uses the cell-specific chip rate obtained by adding the chip rate deviation assigned to the cell to the reference chip rate.
- a data bus repeated sequence with a guide or a data proxy spread signal with a guide is generated, and the carrier wave according to any one of claims 1 to 6 is modulated with these guided symbols to generate a transmission signal.
- Means for transmitting this a receiver waveform, a base waveform demodulated multiplex signal generated using a Usd multiplexed signal and the carrier wave, and a chip waveform on the chip rate peculiar to the senor. And generating a discrete value sequence having the correlation output as an amplitude as a recovered core signal, and claiming the demodulated core signal
- Means for performing despreading and averaging by the method described in 1 to 6 is used.
- the search term 10 is adjacent to each cell by assigning one or more spreading sequence sets specific to Senor in each of the claims 2, 3, 4, and 7.
- Correlation between two spread sequences belonging to the same spreading layer assigned to two senoles and the cross-correlation value between the pair of spread sequences selected for one is small.
- the feature is that the region sequence set is used as the diffusion sequence set unique to the cell.
- B claim term 1 1 was generated by the method of claims 1 and 2 by substituting the packet table transmitted by each transmitter in the SB claim terms 1 and 2 with a pie-port sequence.
- the transmission signal is transmitted as a pilot signal using a common time slot for the senor.
- a pilot signal is extracted, the received multiplex pilot signal is demodulated by the method of claims 1 and 2, despread, and averaged to generate a demodulated pilot pilot.
- Claim 12 provides the pilot set according to claim 11, wherein the transmitter prepares a pilot set consisting of a plurality of J pilot series, each of which is complemented by a frequency spectrum.
- the transmission pilot signal is generated using a mouth sequence, and means for sequentially transmitting these transmission pilot signals is provided, and the receiver is provided for each pilot sequence.
- Analytical sequences that are orthogonal except for the shift position are prepared, and the channel characteristics are obtained using the corresponding analytical sequences for each of the piput response, and these N ⁇ channel characteristics are obtained. It is characterized by the provision of a high-accuracy pilot response by using the average value of as the pilot characteristic.
- Claim 13 is the demodulated data block addressed to the th user ⁇ generated from the e th receive antenna output in claims 6 and 7.
- a demodulated matrix r fc consisting of ⁇ demodulated data blocks generated from a certain symbol by the method of claims 6 and 7 is transformed into an orthogonal transformation matrix.
- Fig. 1 is a propagation path diagram of the transmission wave of the CD MA mobile communication system.
- A is a diagram showing in-cell uplink link transmission
- (b) is a diagram showing in-cell downlink link
- (c) is a diagram showing inter-cell interference waves.
- Figures 2 (a) to 2 (c) are diagrams showing the basic transmission / reception data block symbols.
- Figures 3 (a) and 3 (b) are block diagrams of a transmission / reception jimpol using the repetitive data block carrier modulation method.
- Figures 4 (a) and 4 (b) are comb-tooth spectrum diagrams showing the principle of frequency division transmission.
- FIG. 5 is a block diagram of the base station transmitter ( ⁇ )].
- FIG. 6 is a block diagram of the second user receiver).
- FIGS. 7 (a) to 7 (c) are symbol configurations and frequency spectrum characteristics of the multirate transmission signal.
- Figures 8 (a) and (b) are block diagrams of the user group transmission system using the same carrier wave.
- Fig. 9 is a block diagram of a cell-compatible copy spread spread allocation type transmission symbol.
- Fig. 10 is a block diagram of the ⁇ Senole compatible chip plate assignment type transmission symbol.
- Figures 11 (a) and (b) are block diagrams of the symbol frame for pilot transmission.
- Fig. 1 2 (a) to (C) are block diagrams of transmission and reception symbols of ⁇ zero correlation domain sequence modulation system.
- Figure 13 (a) and (b) are block diagrams of the transceiver of the th user signal.
- Figures 14 (a) and (b) are diagrams of the transmission and reception symbols of the multi-stage data tab spread spread system using the zero correlation region sequence.
- Figures 15 (a) and (b) are block diagrams of the 'user group transmission method using the same spreading sequence.
- Figure 16 is a functional block diagram of a conventional CDMA communication system transceiver.
- Figure 17 is a functional block diagram of a conventional multi-receiver receiver (interference cancellation method).
- Figure 18 is a functional block diagram of a conventional multi-user receiver (correlation separation matrix method).
- A is a diagram showing the ⁇ decorrelator detector (DD), and
- B) is a minimum of 2
- Figures 19 (a) to 19 (C) are diagrams showing the error detector (MMSE-D).
- Fig. 19 (a) to (C) are block diagrams of transmission / reception signals of a dual-function spread system using a conventional data block.
- Figures 20 (a) and (b) are block diagrams of transmission / reception signals of a shift orthogonal sequence spreading method using a conventional data block.
- Figures 21 (a) and (b) are diagrams showing the transmission symbol structure of the carrier modulation system using the conventional repetitive multiple spread symbol.
- the present invention is a system that overcomes the above-mentioned problems of the CD 4 communication system and overcomes one characteristic that is weak against interference caused by interference waves coming from other mobile stations (users), and has improved frequency utilization efficiency.
- FIG. 1 is an auxiliary explanatory diagram of all embodiments of the present invention, and is an explanatory diagram of an intra-cell transmission path of ⁇ ] 4 mobile communication system.
- the delayed wave generated by the transmission wave of the desired station is the self-interference wave 3 ⁇ 4
- the transmission wave from the user station other than the desired station is the inter-station interference wave and This includes not only the direct wave but also the delayed wave due to multipath as shown in the figure, so the received interference wave is the sum of the self-interference wave and the inter-station interference wave.
- the received signal is shown as a received signal from the user station.
- a delayed wave is generated by the multipath indicated by the dashed line.
- the received signal received by the user station “” is not only the direct wave and its delayed wave received by transmitting the illustrated transmission wave (), but also the transmission wave to the other station “ fc ( ⁇ 1).
- the direct wave received by S D (c ⁇ 1) and its delayed wave are also included. Therefore, the transmitter of the base station S has a transmitter having almost the same function as the transmitters of all users in FIG. 1 (a), and the transmission signal 3 ⁇ 4 ( ⁇ ) is given by the sum of the transmission outputs addressed to all users.
- FIG. 1 (c) is a diagram showing the path of inter-cell interference waves between the three cells C !, C and C3.
- the receiver of the base station of the cell ⁇ receives the interference of the uplink transmission from the user Mfc 2 belonging to the cells c 2 and c 3 through the path shown by the solid line.
- the receiver of the user of cell ⁇ is the base station of cells c 2 and c 3
- the channel characteristics from S to are estimated using the received response.
- the S transmitter converts the M-bit binary data, ..3 ⁇ 4J, to be transmitted to, into unit data blocks. After this unit data block is repeated N times, a guard sequence ⁇ is added to generate a guarded symbol ⁇ , and the th carrier is modulated by ⁇ . And transmit with similar data signals addressed to all other users.
- the receiver 3 ⁇ 4 receives a received multiplexed signal in which data signals addressed to all users are multiplexed, and multiplies the received multiplexed signal by the carrier wave, and then performs an averaging process to obtain a user distribution. And generate a demodulated data block.
- the Wth data included in the transmitted unit data block Obtain the soft output TM corresponding to the filter te .
- the M bit transmission binary data block is detected by a hard decision method of m . This is a block thin
- the user's transmitter In the case of uplink link transmission, the user's transmitter generates a pipeline and a data signal in the same manner as downlink link transmission, and transmits these to the base station S.
- the receiver of S is in the same way as the receiver of
- FIGS. 2 to 4 are supplementary explanatory diagrams of the first embodiment of the present invention, and show the configuration and spectral characteristics of the data block symposium / relay generated in the transceiver.
- Figure 2 (a) shows a data block consisting of a binary data sequence of bits transmitted by the Ath user ⁇ .
- Figure 2 (b) shows the data block system 25 columns indicated by block sequence number 77 (0,1,2, ... N).
- ⁇ is given by the following equation.
- the length (number of chips) consisting of the same number of data blocks N repeated core block systems Is a column
- w is the spreading sequence of the chip indicating the pattern that returns. [Here, it is a continuous sequence of 1s. However, (1,-1, 1,-1, 7),
- Periodic sequences such as (1, 1, -1, -1, 1, 1, — 1, — 1, ...) can also be used. This is the diffusion rate. This is because even if these sequences are used, the orthogonal relationship between signals using different carriers can be maintained in Fig. 4 described later], and ⁇ is the Kronecker product. ⁇ shown is the top of ⁇ fc
- R P is moth one de with block spreading period in here (symbol period with guard) is a time width obtained by removing guard period from at Koapuro click diffusion period (core symbol period).
- the guard sequence is a cyclic prefix (Cyclic Prefix) consisting of the rear chips of ⁇ fc .
- guard addition operator CP is guard sequence g k a sigma
- the ⁇ in Fig. 2 (b) is the transmission signal of the following formula (this is generated by modulating the carrier wave of the frequency assigned to the second destination by the guard symbol with guard.
- the signal means a block spread symbol, which may be indicated by the symbol SS below.
- the reference carrier frequency is the cove symbol period ⁇ reverse
- the fundamental frequency given by the number is equivalent to the interval frequency for user identification. (In an actual device, a method is generally used that modulates at the first stage and modulates a frequency much higher than ⁇ at the next stage by its output.)
- Fig. 2 (c) is also the received multiplexed signal that the transmission signal 3 ⁇ 4 transmitted by user 3 ⁇ 4 is synchronized with the other user's signal (downlink) or quasi-synchronized (uplink), which will be described later.
- SS is a multiplexed signal.
- the channel characteristics from the base station to the user are given by the following impulse response because the time resolution is given by the chip period.
- / 3 ⁇ 4 is the complex width of the component delayed from the direct wave component 0 .
- / 3 ⁇ 4 is the same for all users.
- the received multiplexed signal r in which the above-mentioned received signal and other similar received signals are multiplexed has ⁇ as a time variable. If X is an AWGN component, it is given by
- the received multiplexed signal r is the guard sequence corresponding part ⁇ and the core period.
- the core signal corresponding to the received multiple core signal... “' ⁇ / ⁇ ) is established.
- the components corresponding to the first user are indicated by r, 2 ... f) (hereinafter referred to as time variables) Omit Z display)
- This demodulated data block ⁇ includes a delayed wave component, Z ⁇ , generated by multipath as shown in Eq. (13).
- This component corresponds to inter-bit interference in the demodulated component.
- it is necessary to solve the following correlation separation equation. For the sake of simplicity, subscript symbols are used except for indicating the user.
- FIG. 3 shows the configuration of transmission / reception symbols of the repetitive data block orthogonal carrier modulation system according to the first embodiment of the present invention.
- the figure also shows some of the preceding and following symbols.
- four users are supported, and 3 ⁇ 4 modulates the carrier wave ⁇ - by a guarded data block sequence ⁇ composed of four data blocks ⁇ and the guard sequence g fc . Output generated.
- Fig. 3 (b) shows the received signal component on the carrier wave received by the receiver when only the transmitted signal 3 ⁇ 4 of Fig. 3 (a) is transmitted, and the actual reception multiplex in which these four components are multiplexed.
- Is the arrival time difference. a occurs only in the case of uplink.
- each received signal component arrives asynchronously, so ⁇ ⁇ ⁇ usually.
- the base station controls the transmission timing of each user in the uplink so that the maximum arrival time deviation (absolute value) is made ⁇ or less and
- each received signal component is composed of a repetitive sequence of the first block component 1 . Since a guard sequence is added, both the received multiplex core signal and the second user-corresponding received core signal are composed of a sequence in which the same block and 1 divided by a period of N are repeated. Therefore, as described in Fig. 2, the receiver extracts the core part, demodulates it with a carrier wave, and performs averaging processing to generate a demodulated data block ⁇ separated by the user. can do.
- Fig. 4 is a diagram showing the component spectrum of the transmission signal in Figs. Figure 4 (a)) shows the two-sided spectral characteristics when the data block in Figure 2 is subjected to T analysis.
- the above-mentioned chip waveform has a descending characteristic of a (e 0 to 1), it corresponds to the number of bits M. , 0 force, et
- ⁇ (Solid line) in Fig. 4 (b) shows the one-sided spectral characteristics of the modulated output generated by modulating the carrier / shown in the figure using the data block sequence ⁇ i.
- the spectrum of the wavy line is the same output when the carrier wave / 2 to 2 is modulated by ⁇ 2 to ⁇ 4 , respectively, and ⁇ . Is given by Eq. (8). There are no frequency slots that overlap each other. Therefore, these four modulation waveforms are orthogonal to each other.
- the above-mentioned received core signal [see Fig.
- Equation (1 2) Equation (1 3)
- (' ⁇ ) are separated and demodulated using ⁇ , and demodulated signals; ⁇ and ⁇ are generated at different output terminals, and these can be obtained as demodulated data blocks ⁇ and, respectively. . Therefore, user separation can be realized.
- FIG. 5 is Ri first block diagram der base station transmitter of an embodiment of the present invention, is configured as the transmission signal generation unit addressed to the user of th transmitter from the common pi Lock preparative generator M p ing.
- the former is converted into a binary data block of M chip in Eq. (2) by the data block generation circuit DBF in the figure.
- Baseband This signal is applied to the multiplier MOD 3, MOD is to modulate the aforementioned carriers assigned by Ri to ⁇ the £, it generates a 3 ⁇ 4 addressed transmission signal (BSS). This signal is sent to the other user
- the modulator MOA generates user common pi port Tsu preparative-series v c of length M chip application timing point of different from the data input time point pi Lock preparative information.
- Pilot signal symbols are represented by adding a superscript to the data signal symbol in Fig. 2. In Fig. 2, the signal with replaced by becomes the pilot signal.
- Protection sequence insertion circuit G / adds a guard sequence in the same way as described above, and generates a guarded pipe repeat sequence as shown below.
- the convolution multiplier COV and modulator MOD 2 shown in the figure generate a baseband pilot signal (a pilot symbol with guard) and use this to generate a common carrier / c [data, pilot For time-division transmission, any value of given by Eq. (8) can be used. ] To generate a transmission pilot.
- each user's transmitter in uplink transmission uses the same block diagram as in Fig. 5.
- the signal in the common path I Lock preparative generator TUP ⁇ , sigma s is so unique signal ⁇ (Interview one
- the adder circuit ⁇ for synthesizing the signal ⁇ addressed to other users is removed, and 3 ⁇ 4 and 3 ⁇ 4 are time-division multiplexed in S to generate and transmitted to the base station.
- FIG. 6 is a block diagram of the user receiver according to the first embodiment of the present invention.
- D k p is a channel response generation unit between S and 3 ⁇ 4, and corresponds to the transmission signal ⁇ in FIG. 5 (by a circuit not shown) and included in the received multiplexed signal received in a time division manner. Extract the lot signal. The output extracted in this pilot period is converted to the baseband signal ⁇ in the modulator MOA and the reduction filter in the figure with the local carrier of the frequency added.
- the real part cos2 c t and the imaginary part sin 2 c t of the carrier wave are added to the separate modulators MOZ3 ⁇ 4 and MO, respectively, and their outputs are added to the reduction filter ⁇ and LPF Q ⁇ respectively.
- a complex output consisting of real part (/) and imaginary part fe) is obtained.
- Such details of the circuit for generating ⁇ output separation are omitted for simplicity.
- the attenuation of the received signal is compensated by an equivalent circuit that is not shown.
- the demodulated signal generator generates the data block spread symbol (0SS) included in the received multiplexed signal in the data period in the same way as the pipeline. And extract in a time-sharing manner.
- the output is subjected to carrier multiplication, filtering, and averaging processing using a local carrier wave, and a demodulated data block consisting of M chips including M-bit data block components is generated.
- ⁇ is the waveform on the continuous time axis, but the chip waveform correlator C shown.
- r () the correlation output between these continuous waveforms and the chip waveform is generated every chip time interval ⁇ and converted into a waveform on the discrete time axis having a value every ⁇ .
- Use signal components are included in this discrete signal. That is, a chip period interval discrete sequence ⁇ , is obtained.
- the synchronization circuit S uses a frame synchronization signal as described later.
- 3 ⁇ 4 received wave main wave fe 3 ⁇ 4 received wave main wave fe.
- the timing pulses ⁇ and e s shown in the figure synchronized with) are generated, and these specify the time position of the synchronous reception core symbol period ⁇ .
- the gate signal and ⁇ shown in the figure extract the same demodulated pilot signal and the same data signal; the core signal ⁇ and ° excluding the guard from ⁇ .
- These signals are a pipeline and data block repetition sequence. It consists of a chip impulse.
- These repeated sequences are added to the averaging circuit Oi shown. O, converts the sequence length of these signals from to M chips by averaging processing with a block period of 7 as unit time, and the demodulated pilot response between S-3 ⁇ 4 ⁇ and Each demodulated data block is output. In this process, the signal components of other users are removed.
- / is the chip position variable
- -Zo ' is the 4mm Zo cyclic shift cycle sequence
- ⁇ is shown in the figure. If the pilot response ⁇ is added to the matched filter F matched to the Zo's cyclic shift analysis sequence force, the output is the complex amplitude cross-correlation function M
- J-1 J7 ⁇ PM-J
- J-1) J7 ⁇ PM-J
- ⁇ I GN component included in the output 3 ⁇ 4 a plurality of similar outputs obtained in adjacent time zones are averaged in addition to the averaging circuit O 2 shown in the figure, and the values shown in Equation (1 0) A component response is generated, which is added to the analysis circuit ⁇ and the synchronization circuit.
- Each transmitter transmits a frame composed of a preset symbol sequence and a frame synchronization signal, and the receiver establishes reception synchronization by a known means from this frame synchronization signal.
- the receiver adds the frame synchronization output generated by this function to the synchronization circuit.
- the SN generates a timing pulse, which indicates the position of the core signal and the aforementioned core signal, from the channel response and transmits them to the gate ⁇ shown in the figure. The With the help of these timing pulses, the core signal and; are generated as described above.
- the analysis circuit uses the channel ⁇ response matrix ⁇ composed of the demodulated data block ⁇ and channel characteristics // fc to solve for the desired station by solving Equation (14).
- the block diagram of the base station receiver in uplink transmission has a configuration using the elements in Fig. 6.
- the rth user receiver circuit RZ () in Fig. 6 is prepared corresponding to the number of users.
- the circuit used here is a circuit in which the / ⁇ carrier in Fig. 6 is replaced with the analysis sequence "by a sequence 3 ⁇ 4 that is orthogonal to the pilot sequence.
- the detection output can be obtained using P , D ,! ⁇ 3 ⁇ 4 .
- FIG. 7 is a diagram showing a symbol configuration and frequency spectrum characteristics of a multi-rate transmission signal according to the second embodiment of the present invention.
- ⁇ , ⁇
- Figure (b) is a double-sided spectral characteristic similar to the lower part of Fig. 4 (a), obtained when DFT analysis is performed on (2 (data block repetition sequence with guard ) 2fe .
- each signal has a common core symbol period: ⁇ , complete user separation is possible regardless of the transmission rate.
- the receiver can perform these operations. Data can be separated and demodulated. (The required transmission power for each user is proportional to the transmission rate, because the effective spreading factor N e is inversely proportional to the transmission rate. However, this is reasonable and the transmission The power peak value is constant, so it will not cause any adverse effects on system operation.) ⁇
- each user is assigned a set of occupied frequency slots if the carrier frequency is accurately expressed. Therefore, when the bandwidth is given, the frequency utilization efficiency (bit / band) of the system is
- FIG. 8 is a transmission / reception system diagram of the third embodiment of the present invention and a block diagram of a multi-output user group transmission system using the same carrier wave.
- a reception method using a plurality of transmission antennas and a plurality of reception antennas is called a fixed 0 (multi-input / output) method.
- £ 2 is used to demodulate the input received via these antennas using a pair of receiving antennas ( ⁇ f 2 ; ⁇ ) and group carrier / i, and a demodulated data block,; 2 , 1 ) is generated.
- ⁇ ⁇ 3 ⁇ 4 is the same demodulated data block generator as £> f in Fig. 6.
- DEM corresponds to LPF, Cor (q), A, and O in Fig. 6.
- Channel characteristics 1 to f between the transmitting antenna ⁇ and the four receiving antennas are added to each receiver in advance using the pilot response described above.
- a concatenated demodulating vector with ⁇ 1 in cascade and M-chip vector and its concatenated transmitting data vector are defined using transposition symbol 7 by the following equation.
- the submatrix of Eq. (26) has the same form as Eq. (14), and the channel characteristics for the base station (BS)
- H is an expanded channel matrix generated from. This equation is solved by the decorator or detector principle.
- Each data can be detected by making a hard decision on each component of the soft output H of the unknown vector 1 f that has been found.
- the same technique can be used, that is, the number of users that can be accommodated can be increased by providing £ receiving antennas in the base station and performing the same processing.
- the matrix size of the above equation increases with £, and as a result, the error rate characteristic decreases due to the deterioration of the regularity of the matrix.
- the number of users in the group is set to a value lower than the limit value, for example, £ / 2, the number of users can be increased with a low error rate.
- FIG. 9 shows a transmission symbol configuration method of the fourth embodiment of the present invention for the purpose of inter-cell avoidance.
- equations (8) and (9) the following relationship is generally established between the above parameters.
- the destination signal received by ⁇ is the desired signal
- the destination signal is the interference signal.
- the signal component received by is given by the following equation.
- the demodulated core signal before the averaging process includes the transmission data repetition sequence shown in Fig. 2 (b) as a component. If the symbol period with transmission guard ⁇ ⁇ is the same regardless of the cell and synchronous reception is assumed, the demodulated signal ⁇ SS) is It becomes.
- the core block repetition sequence period is a cell-specific value, the above parameters set in each cell for the above output are equal to each other (M, N) and as described above. Cell specific value
- ⁇ ' is averaged with the ce parameter
- the chip number of each block of the transmission signal ⁇ 'that is added according to the “chip number” (the chip on the dotted line drawn down from A) is taken as the addition chip number, and this is the SCN.
- the chip numbers constituting the demodulated data block component when e ' ⁇ are assumed to be randomized.
- FIG. 10 is a fifth embodiment for the purpose of avoiding inter-cell interference similar to FIG. 9, and is a configuration diagram of symbols generated by a transmitter of a cell-compatible chip rate allocation method.
- the guard cycle Core symbol period ⁇ , symbol period with guard TP P block size M is a common value for cells. In general, the following relationship holds between the above parameters.
- T P T S + Tg
- the two types of interference avoidance methods described above can be applied not only to the spread spectrum CD MA method, but also to the conventional CDMA method that transmits one bit with one symbol. Even if a set is used, symbols coming from other cells are all randomized in the despreading process, so there is an effect of avoiding interference.
- FIG. 11 shows the symbol transmission symbol for the pipe transmission according to the sixth embodiment of the present invention.
- N P pieces of pie Lock preparative symbols sequentially transmitted on N P number of frames constitute a cyclic Se Tsu preparative.
- T SF Shinborufu Les chromatography arm cycle
- T PF pie Lock If it is a frame period
- Figure 11 (b) is a block diagram of the ⁇ th pilot symbol transmitted by, and in the data block repetition sequence ⁇ ⁇ with guard in Figure 2 (b), the data block is v It takes the form replaced by c ( « p ).
- the receiver demodulates the pilot symbol P (") extracted by the synchronization circuit by the method described with reference to Fig. 6, and generates a channel response corresponding to Eq. (21).
- B 1-1 Basic method-In the receiver, as a method of realizing the separation of the received received multiple signal user: ⁇ , the above method (P-5) is based on the transmission data block. This method is known as a method for modulating the shift orthogonal sequence C 3 ⁇ 4.
- ZCZ zero-correlation zone
- Fig. 12 is a block diagram of the transmission / reception symbol of the seventh embodiment of the present invention, which shows the configuration of the data block symbol generated in the transmitter / receiver.
- Fig. 12 (a) shows the process of generating a transmission signal from the data block shown in Fig. 2 (a) in the same way as Fig. 2 (b).
- Figure 2 with (b) The difference is the multiplication by the sequence and the modulation by the user common carrier.
- each chip element of the first series of one ZCZ series set 1,2,...
- fc fc core symbol
- ⁇ data blocks are arranged. .., N
- ⁇ data block spread signal
- r is the received multiplexed signal (5) corresponding to the same number of transmitted signals as, and is given by the following equation as the sum of the destination received signals.
- H fc. Indicates ⁇
- the block portion of the hatch indicates the delayed received component (H ⁇ ⁇ ) of the preceding block to that block.
- H k , kx is the channel matrix.
- a despread output is obtained by multiplying the demodulated core multiplexed signal by the sequence Z fc assigned to the desired user and its right shift sequence _j.
- this output is averaged by period: ⁇
- the following demodulated data table is obtained. 43
- Ht H kl + H k0 .
- y k 0 in Fig. 1 2 (b). Are the components corresponding to, and in the above equation.
- T B MT C is necessary.
- Equation (35) shows that the user component corresponding to the transmitted data block of 3 ⁇ 4 can be separated from the received multiplexed signal r by the orthogonal characteristic of Equation (35). If a known decorrelator or MMSE means is applied to the equation (43), an estimated vector 3 ⁇ 4 can be obtained.
- N r0 ⁇ / M is Hermitian transpose of, despread out This is the unit power of AWGN noise power, size M xM included in ⁇ . If each component of 3 ⁇ 4 is hard-decided, the user's data block detection output of Equation (15) can be obtained.
- FIG. 13 is a block diagram of a transmitter / receiver for uplink transmission according to the eighth embodiment of the present invention.
- FIG. 13 (a) shows a transmission signal generator necessary for data transmission of user “ fc ”.
- Figure (b) shows the demodulated signal generator and detection output generator of the base station receiver (the generation and demodulator of the pilot signal is omitted.)
- Figure (a) is shown in Fig. 5.
- the sequence repetition circuit RE ⁇ shown is replaced with the block spreading circuit S.
- S outputs the core symbol ⁇ ⁇ by performing convolution multiplication of the data block on the spreading sequence Z fc .
- Figure 13 (b) shows a configuration in which the modulator MOD is inserted between the gate A and the averaging circuit in the circuit shown in Figure 6.
- the received multiplexed signal r is a demodulated core multiplexed signal with discrete amplitude in the circuit from MOD 2 to Gate A. Is converted to Is despread by ⁇ to generate the demodulated core signal; ⁇ in Fig. 12. O, averages this and generates the demodulated data block, which is the user separation output.
- the function of the circuit that follows is the same as in Figure 6.
- a system can be configured by providing the base station and user with similar transmission / reception functions.
- the baseband transmission block spreading symbol similar to (37) is given by the following equation.
- the baseband output obtained by demodulating 2 with a carrier wave is given by the following equation using the same symbols as in equations (39) and (42) but differing only by Q.
- ⁇ p z is the interference component due to the component contained in ⁇ , and the interference matrix from to. Similarly, if ⁇ is calculated by MMSE, the following equation is obtained.
- [3 ⁇ 4 C ] H ⁇ 3 ⁇ 4 C (55)
- Soft output of length 2 3 ⁇ 4 A hard value is determined for each component of G , and the detected value is obtained.
- the number Z of multipath waves can be expressed by the equations (3 5) and (4 4) in this method. Since the relational expression needs to be designed to be ⁇ ⁇ ( ⁇ + 1), the received component corresponding to (-J + l) bits from the top in the data block is 1 block right In other words, it is not included in the delayed wave component to the block of R. That is, to the right of the despreading vector ⁇ shown in Equation (50) Side of the second term Does not contain the above components, it is impossible to detect (M-+1) bits from the beginning by the above method.
- the detection output can be obtained in the same manner as in equation (59).
- This output uses a preceding block component rather than the output obtained via the soft output in Eq. (55), and is a highly accurate value.
- 3 ⁇ 4 are obtained sequentially, the error component included in these soft outputs is made sufficiently small, Furthermore, it is possible to obtain a detection output with less errors.
- FIG. 14 shows a ninth embodiment of the present invention, and is a configuration diagram of transmission symbols for multi-rate transmission.
- the set of the first ZCZ series for user separation is
- the transmission signal of ⁇ is generated by modulating the common user's carry-over wave with the baseband signal (SS) Q generated by replacing ⁇ in Eq. (37).
- Each component of the received multiplexed signal r received by the base station S has the same configuration as in Fig. 3 (b), and is received with quasi-synchronization. From the three received components r 2 and r 3 corresponding to and It becomes.
- r is multiplied by the series Z 0) and Z-1) and despread and averaged in units of periods, so that Output ⁇ (sequence length M can be obtained. Also, Z (0) and
- the multi-rate transmission method described above can be generalized as a method in which ZCZ sequences are provided in multiple stages and the sequences exclusively selected from each stage are convolved and multiplied, so that the service range of the transmission rate can be set widely. If there are many low-rate users, the number of users who can be served simultaneously can be increased. In addition, if the B-1 basic method is used, the total transmission data rate decreases to 1/2 for each number of sequence stages. However, if the B-2 high-efficiency transmission method is used, the rate increases due to the increase in the number of sequence stages. No decrease occurs, and high frequency utilization efficiency can be maintained.
- Section 3 Similar to the method described in A-3, an explanation will be given of how to increase the number of accommodated users using a large number of receiving antennas.
- Section 3 an example of a transmission method for two users using the same carrier wave was described, but the common correlation domain sequence modulation method uses a common transmission wave.
- This section describes a user separation and demodulation technique that can increase the number of users under the condition that one ZCZ sequence is used as a spread sequence by increasing the number of receiving antennas.
- FIG. 15 is a transmission / reception system diagram of the tenth embodiment of the present invention and a block diagram of a multi-output user group transmission system using the same spread sequence.
- Figure (a) is a diagram of an uplink transmission system in which ⁇ users transmit in the same spreading sequence based on the power of each user group (1, 2, ).
- 2 is a block diagram of the demodulated data block (H, J; 2 (H until J is generated. Q: 19737
- In-group transmission user number and reception antenna number indicate the channel characteristics between the transmitting and receiving antennas.
- the multi-output user group transmission method described in A-3 and A-4 is a technology that increases the number of users by using multiple receiving antennas.
- the multiple output SN improvement method that improves the signal-to-noise ratio of the received demodulated output using multiple antennas is taken as an example of the method described in A-3 as the first example. This is described with reference to Fig. 8.
- the channel matrix t corresponding to the user t is used, and the orthogonal transformation matrix such as force 2 is given by the following equation. '
- Equation (14) the channel matrix H fe .
- the combined soft output is generated.
- This output has a high signal-to-noise ratio due to the weighting described above. Therefore, transmission with a low error rate can be realized by using a hard-decision output.
- Orthogonal transformation with respect to the time axis is also possible in the same way as the spatial transformation method described above.
- the combined soft output can be obtained by adding the soft outputs found from the component vectors multiplied by the above weights.
- the orthogonal carrier modulation method (method (P-7)) based on the conventional repetitive sequence is used as each data block to transmit the transmission data for M-bit transmission. (Simultaneous addition of M of spread sequences multiplied by each)), so that the peak transmission power required to obtain the required error rate characteristics is significantly increased (by 2 times the power of one sequence transmission). Has solved.
- the present invention uses a single-sequence data block consisting of binary M chips for M-bit data that is not subjected to sequence addition, so that the transmission power can be significantly reduced as compared with the method (P-7). Further methods (P -3) In order for the receiver in (3) to separate M multiplexed sequences with good error rate characteristics, it is generally necessary to set the frequency to the above spread sequence length (data block length), and the frequency Usage efficiency decreases.
- the spreading factor of the number of users is 1/2 or less. Therefore, although the frequency utilization efficiency cannot be increased, the present invention has an effect of achieving reduction of guard sequences and increase of the number of users as compared with these.
- the invention described in claims 2 and 3 is that when the shift orthogonal sequence spreading method (method (P — 6)) based on the conventional data block increases the required bandwidth N times using the spreading factor N, Solved the problem that the number of users that can be accommodated was limited to (N-1) / 2. In other words, the present invention has the effect of realizing a system that increases to ⁇ / 2 by the technique of claim 2 and W by adding the technique of claim 3.
- the present invention doubles the number of users by spreading using ZCZ sequences and a new correlation separation method in the receiver, and as a result, improves frequency utilization efficiency.
- the rate can be improved to almost 1.
- claims 4 and 5 are provided with an effective means for adapting the conventional systems using block spreading to the user's multi-rate demand (services in which multiple data transmission rates are mixed). The problem that was not solved is solved.
- the present invention assigns a data block repetition rate and a carrier frequency slot corresponding to a desired data transmission rate to each user's transmitter for each user's desired data rate.
- multi-rate services can be provided without reducing the overall frequency utilization efficiency of the system Effective.
- the conventional M1 ⁇ 2SE multi-user MiO reception method applies a multi-input / output method (MMO) to a single, symbol transmission method that carries one bit.
- MMO multi-input / output method
- high-speed data transmission requires a long guard sequence compared to the core sequence, and solves the problem that has caused a significant decrease in frequency utilization efficiency.
- the present invention generates a block spread symbol, transmits it, and establishes a method for analyzing the combined output of the receiving antenna outputs of a plurality of antennas installed in the receiver. (Reduced error rate or transmission power).
- the conventional single data spreading method (method (P_l) to method (P—4)) is cell-specific for transmission symbols to avoid inter-cell interference.
- Sent after being multiplied by the scramble sequence of By using the method of randomizing interference from other senor by using the method of descrambling the signal symbol with the scramble sequence, the orthogonality between the received symbology significantly decreases, and as a result In addition to not being able to sufficiently eliminate interfering interference, the problem of increased intra-cell interference was solved. Furthermore, when the above-described scrambled sequence multiplication technique was applied to the current data block spreading technology, the problem that inter-cell interference in the cell increased due to multipath was solved. .
- a transmission signal is generated using a cell-specific transmission core symbol period assigned to a cell to which each transmitter belongs, and a transmission signal is generated using a ⁇ or cell-specific chip.
- a transmission signal is generated using a ZCZ sequence set.
- the invention of the five claim terms 1 1 and 1 2 is the conventional method and the data. Transmitting the pilot information to the real axis and the axis component of the transmitted symbol. The channel characteristics are obtained. B Result Under the multipath transmission conditions, the real imaginary axis of the reception symphonor Because of the interference between the components, we solved the problem that the degree of channel characteristics obtained by this method deteriorated significantly. In addition, the conventional spread spectrum transmission system has solved the problem that an effective pipe transmission system has not been developed. According to the present invention, in the claims 1 to 10, the transmission pipeline signal is generated by the method of replacing the transmission data tab code with the spreading sequence for the packet, and a common node with other users is used.
- This signal is transmitted on the terminal thyms p-y, and the receiver demodulates the 1 "received multiple piez signal corresponding to these noises V and analyzes the output separated for each signal. Analysis by series Thus, a simple technique for obtaining channel characteristics is provided. Since the present invention transmits pilot symbols by sharing the same bandwidth with a large number of users, the frequency response efficiency of the system is flat without reducing the frequency utilization efficiency of the system. Has the effect of generating
- the invention of MMO or adaptive array using multiple receiving antennas is an optimal receiving technology for detecting a desired user component from multiple received multiplexed signals under a high S / N ratio.
- the problem of not having been established was decided.
- the surplus dimension is based on multiple antenna outputs (or symphonoles at multiple time positions). Technology to improve signal-to-noise ratio and thus reduce error rate.
- the present invention orthogonally transforms a demodulated matrix consisting of a plurality of demodulated outputs, adds a high weight to the high signal-to-noise ratio component in the transformed matrix, and adds the softened transmission data. Has the effect of significantly increasing the output signal-to-noise ratio
- the number of users is doubled to realize a system that obtains a low error rate.
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Publication number | Priority date | Publication date | Assignee | Title |
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EP1727297A1 (en) * | 2005-05-25 | 2006-11-29 | Siemens Aktiengesellschaft | Method and Terminal for reducing interference in a radio communication system |
KR100830415B1 (ko) | 2006-06-23 | 2008-05-20 | 재단법인서울대학교산학협력재단 | 다중 사용자 다중 셀 환경에서의 다중 송수신 안테나 장치및 그 방법 |
US8571136B1 (en) * | 2007-11-21 | 2013-10-29 | University Of South Florida | Adaptive symbol transition method for OFDM-based cognitive radio systems |
US8503338B2 (en) * | 2010-06-28 | 2013-08-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Optimized signaling of demodulation reference signal patterns |
FR2975193B1 (fr) * | 2011-05-12 | 2020-10-09 | Thales Sa | Procede et systeme de localisation d'interferences affectant un signal de radionavigation par satellite |
JP2013017016A (ja) * | 2011-07-04 | 2013-01-24 | Sharp Corp | 基地局装置、移動局装置、通信システムおよび通信方法 |
DE102011080999A1 (de) * | 2011-08-16 | 2013-02-21 | Rohde & Schwarz Gmbh & Co. Kg | Verfahren und Vorrichtung zur Detektion von zeitgleich im selben Kanal übertragenen Flugfunksignalen |
WO2013036091A2 (en) * | 2011-09-09 | 2013-03-14 | Samsung Electronics Co., Ltd. | Method and apparatus for opportunistic user scheduling of two-cell multiple user mimo |
WO2015137779A1 (en) * | 2014-03-14 | 2015-09-17 | Samsung Electronics Co., Ltd. | Method and apparatus for encoding and decoding packet |
RU2552183C1 (ru) * | 2014-05-20 | 2015-06-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет имени Гагарина Ю.А." (СГТУ имени Гагарина Ю.А.") | Способ выделения сигналов импульсного типа по временным данным |
CN104270221B (zh) * | 2014-09-03 | 2015-07-22 | 江苏中兴微通信息科技有限公司 | 一种zcz序列集合的参数化生成方法 |
KR102435821B1 (ko) * | 2015-10-29 | 2022-08-25 | 삼성전자주식회사 | 통신 시스템에서 데이터를 송수신하는 장치 및 방법 |
CN109217968B (zh) * | 2018-08-17 | 2020-04-28 | 盐城工学院 | 一种基于相移键控技术的采用cdma技术的近距离无线网络 |
CN113727381B (zh) * | 2021-08-31 | 2023-06-27 | 中国联合网络通信集团有限公司 | 网络容灾方法、装置、系统及存储介质 |
CN116980067A (zh) * | 2022-04-22 | 2023-10-31 | 华为技术有限公司 | 扩频代码生成方法 |
CN117061290B (zh) * | 2023-10-13 | 2023-12-22 | 中国电子科技集团公司第五十四研究所 | 用于大用户数量的达分多址接入和群路解扩解调系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001094466A (ja) * | 1999-09-17 | 2001-04-06 | Katsuyoshi Azeyanagi | 無相互相関領域を有する符号系列セットを用いたcdma通信方式 |
JP2002536870A (ja) * | 1999-01-29 | 2002-10-29 | ピンツィ ファン | 無相関領域を有する2値符号系列を用いた無干渉適応スペクトル拡散通信方式 |
JP2002344359A (ja) * | 2001-03-12 | 2002-11-29 | Katsuyoshi Azeyanagi | 多種拡散系列を用いたcdma通信方式 |
JP2003023675A (ja) * | 2001-07-06 | 2003-01-24 | Katsuyoshi Azeyanagi | 相互相関抑圧形拡散系列セットを用いた通信方式 |
JP2005260900A (ja) * | 2004-03-12 | 2005-09-22 | Tama Tlo Kk | 符号分割多重信号の相関分離識別方式 |
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DE19933489C2 (de) * | 1999-07-16 | 2003-05-08 | Infineon Technologies Ag | Verfahren und Einrichtung zum Erzeugen eines kanal- und teilnehmercodierten Nachrichtensignals |
WO2002073230A2 (en) * | 2001-03-14 | 2002-09-19 | Mercury Computer Systems, Inc. | Wireless communications methods and systems for short-code and other spread spectrum waveform processing |
US20040196780A1 (en) * | 2003-03-20 | 2004-10-07 | Chin Francois Po Shin | Multi-carrier code division multiple access communication system |
US7463672B2 (en) * | 2004-03-16 | 2008-12-09 | Peter Monsen | Technique for adaptive multiuser equalization in code division multiple access systems |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002536870A (ja) * | 1999-01-29 | 2002-10-29 | ピンツィ ファン | 無相関領域を有する2値符号系列を用いた無干渉適応スペクトル拡散通信方式 |
JP2001094466A (ja) * | 1999-09-17 | 2001-04-06 | Katsuyoshi Azeyanagi | 無相互相関領域を有する符号系列セットを用いたcdma通信方式 |
JP2002344359A (ja) * | 2001-03-12 | 2002-11-29 | Katsuyoshi Azeyanagi | 多種拡散系列を用いたcdma通信方式 |
JP2003023675A (ja) * | 2001-07-06 | 2003-01-24 | Katsuyoshi Azeyanagi | 相互相関抑圧形拡散系列セットを用いた通信方式 |
JP2005260900A (ja) * | 2004-03-12 | 2005-09-22 | Tama Tlo Kk | 符号分割多重信号の相関分離識別方式 |
Non-Patent Citations (1)
Title |
---|
LEUS G. ET AL: "MUI-Free Receiver for a Synchronous DS-CDMA System Based on Block Spreading in the Presence of Frequency-Selective Fading", IEEE TRANSACTION ON SIGNAL PROCEEDING, vol. 48, no. 11, November 2000 (2000-11-01), pages 3175 - 3188, XP001200981 * |
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CA2584966A1 (en) | 2006-04-27 |
EP1811681A1 (en) | 2007-07-25 |
US20110096810A1 (en) | 2011-04-28 |
JP2006121636A (ja) | 2006-05-11 |
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