TW201220748A - Wireless communication system, transmitter, propagation path characteristic estimating apparatus, propagation path characteristic estimating method and program - Google Patents

Abstract

Proposed are a communication system and the like that allows the quantization noises to be reduced even in a case of using a low resolution ADC. A transport signal generation unit (10) of a transmitter (3) performs, based on the phase, a constant envelope modulation, thereby generating a transport signal. A receiver (5) uses a low resolution ADC (39) to quantize the received signal. The low resolution ADC may cause the quantization noises to occur significantly. However, since the quantization noises significantly occur in the amplitude, a constant envelope modulation using the phase is performed, thereby allowing highly precise communications to be achieved, while avoiding the quantization noises, even in the case of using the low resolution ADC. Moreover, because of the achievability of highly precise wireless communications, a propagation path characteristic estimation unit (33) can more precisely perform a propagation path estimation by implementing repetitive calculations.

Description

201220748 51:LPF part-H Ί: 61: initial estimated value calculation circuit 63: copy signal generation unit 65: error calculation unit 67: estimated value calculation unit 69: known signal generation unit 71: estimated propagation path unit 73: quantization Department Ο 7 5 : Digital μ IX part 77 : LPF part 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: 6. Description of the invention: [Technical field of invention] 〇 The present invention relates to wireless communication a wireless communication system, a transmitter, a propagation path characteristic estimation apparatus, a propagation path characteristic estimation method, and a program, particularly regarding a transmitter including a transmitter A wireless communication system with a receiver, and the like. 100120126 1003289530-0 201220748 [Prior Art] The transmission rate is required to be further increased in the next generation wireless communication system (tranSm1SSi〇nrate). However, due to the limitation of the round-out power of the wireless base station, the widening of the access line is accompanied by the br〇adband, which narrows the communication area of each base station. In order to cover the entire service area, a large number of base stations are required, along with the cost of laying the wire backhaul line, the amount of investment in the basic S Shishi is increased. . In order to suppress an increase in the cost of infrastructure installation with an increase in the number of base stations installed, it is important to develop a technology that minimizes the cost of laying a small wireless base station and a wired rear network line that can be easily installed. As a technology for suppressing the laying of wired back-end network lines, wireless multi-hop netw〇rk (MESH network) technology has attracted attention. The MESH network refers to a communication system that wirelessly connects base stations to each other. In the system, each of a few to a dozen sets of a core base station connected to a wire line is provided with a plurality of base stations connected by a wireless relay starting from the core base station. The cost of laying the wireline can be reduced by wirelessly connecting a plurality of relay base stations to the core base station. Therefore, in order to increase the number of relay base stations, a large-capacity wireless relay transmission technology is required. However, the frequency resources are limited. Therefore, there is a limit to the increase in communication capacity for the widening of the transmission line, and the frequency utilization efficiency must be improved. As a technique to improve frequency utilization efficiency, MIM〇 (Multiple Input)

Multiple Output: Multiple Input Multiple Output) is noticed. ΜΙΜΟTechnology 100120126 1003289530-0 4 201220748 疋4 uses a plurality of transmission and reception lines, (transmitting an (j receiving antenna) at the same time, the same frequency multiplex transmission of multiple signals, such as in IEEE802. 11n wireless LAN system (wireiess Local Area

Network system: Wireless local area network system is adopted by the standard. In order to increase the trunk line capacity of the MESH network, the MIM(R) technology is very effective. In the past, in the wireless communication system, a linear modulation method was adopted. Further, the applicant has proposed a nonlinear modulation method such as envelope modulation (e.g., FM modulation) (see Patent Document 1). Moreover, in the wireless communication environment, the reflected wave from the surroundings 'delay wave and the like will arrive. Therefore, it is a problem that the received signal generates inter-symbol interference (5) - by interference). An adaptive equalizer is known as a technique for removing inter-disturbance. In order to properly determine the transfer characteristic of the 笙a 仏 疋 疋 equalizer, it is important to estimate the propagation path characteristics laterally accurately in the first and second. The applicant proposed a method of transmitting the known signal by the error robbing, the main V/Ke two zantzin machine, observing the known signal in the receiver, estimating the 偻changing, & 4 broadcasting control characteristics (refer to Patent Document 2). [Patent Document 1] Japanese National Patent Publication No. 2009-81 745 [Patent Document 2] 曰 ΟΠΛ Η Η Η 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 In order to reduce the power consumption of the wireless base station (1 ow 100120126 1003289530-0 201220748 power consumption) and to reduce the size, it is a big problem to improve the electrical efficiency of the transmission power amplifier. However, in the linear modulation method adopted in the conventional wireless communication system, since the input/output characteristics of the amplifier are required to have high linearity (because linear amplification is required), the power conversion efficiency at the time of amplification (p〇wer conversi) 〇n efficiency) is very low compared to nonlinear modulation. Especially in the multi-carrier (mult icarrier) method adopted in wireless LAN or digital terrestrial broadcasting, the transmitted signal has a very local peak-to-average power ratio (papr : peak-t〇-Average Power Ratio) 'The required compensation amount of the amplifier (am〇unt 〇f back-〇ff) ' 'the result power conversion efficiency is further greatly reduced. In addition to this problem, in a linear modulation system with information on the envelope amplitude, a high-resolution analog-to-digital converter (ADC: Anal〇g-Digital Converter) is required in the demodulation process of the receiver. Therefore, it is difficult to reduce the power consumption and miniaturization of the hardware. These problem points become more severe in the transmission of a plurality of antenna elements (transmitters). In order to provide a large-capacity relay transmission using ΜΙΜΟ, this problem that overcomes the burden of a large device becomes an essential requirement. In order to cope with the above problems, Patent Document 1 proposes a constant transmission wireless power transmission system and a constant envelope wireless transmission method (c〇nstan1; envei〇pe wireiess transmission scheme) which are excellent in electrical efficiency. Moreover, in order to estimate the propagation path characteristics, it is necessary to use a high-resolution ADC to observe and receive 100120126 1003289530-0 6 201220748 signals in a device using a conventional linear modulation method. Further, even in the case of the constant envelope wireless transmission method described in the patent document, the envelope of the received signal is fluctuated due to the inter-symbol interference caused by the delayed wave or the like. Therefore, when a low-resolution ADC is used, the error (quantization noise) caused by the quantization (C[uantizati〇n) is increased, and it is difficult to accurately estimate the characteristics of the propagation path. Moreover, it is difficult to estimate the characteristics of the linear propagation path when performing nonlinear fm demodulation on the receiver side. Therefore, it is necessary to use a high-resolution adc on the receiver side in the conventional propagation path characteristic estimator.

Therefore, the object of the present invention is to provide a wireless communication system or the like which can reduce quantization noise even in the case of using low resolution.

The first aspect of the invention is a wireless communication system comprising a transmitter and a receiver, wherein the transmitter transmits a corresponding transmission sequence X[n] to the receiver by wireless communication (n = 〇, . N-l'N For the transmission signal of the number of symbols (number·μ symbols), each value of the transmission sequence is [corrected into one of a plurality of candidate values, and each of the candidate values is given a corresponding one or a plurality of phases in advance. The transmitter has: a signal generating means for generating the transmitted signal by performing constant envelope modulation processing according to a phase; and transmitting a transmitting antenna of the transmitting signal to the receiver, wherein the signal generating means is by time series Tn, so that the phase in each time tn is a packet given a phase corresponding to each value χ[η] of the above-mentioned transmission sequence, so that the envelope is at the time t(tn-, <t<t„) The constant envelope modulation process is performed by the same value of tn^ or 扒, and the receiver has a receiving antenna that receives the transmission signal transmitted by the transmitting antenna via a propagation path. The 100120126 1003289530-0 201220748 received in the aforementioned receiving antenna receives the signal quantization 'and generates the young conversion means for receiving the quantized jitter. The middle second = the second viewpoint is the first viewpoint of the wireless communication system, the basin = the communication sequence A sequence is known in advance for the transmitter and the receiver, and the receiver has a propagation path estimating means for estimating the characteristics of the propagation path of the road station, the propagation path·-, +社A曰The estimation means has: an initial estimation value calculation means for determining an initial estimation value of the characteristic 2 number indicating the characteristic of the propagation path of the former acupuncture moxibustion, Μ α; and the aforementioned known sequence The known signal is quantized by the estimated received signal obtained by the estimated path determined by the aforementioned characteristic parameters and generates a copy signal of the copied signal.

The generating means calculates the error correcting means for the difference between the received quantized J-stacking signal and the copying signal; and uses the aforementioned receiving county to receive the month 31! The difference between the 矾 与 and the aforementioned copy signal is updated to calculate the estimated value of the aforementioned characteristic parameters. 1 Kai Dingnu, narration copy signal production

It is known that the above-mentioned reproduced signal is further generated by using the above-mentioned estimated value to calculate the parameter characteristic parameter which is updated again by the above-mentioned estimated value, and I m ° τ iso. > The third aspect of the invention of the present invention is a wireless communication system in which the first estimate is adhered to, and the aforementioned initial estimated value has a L correlator (the correlator) Among the L related benefits, the correlation value exceeds the specified threshold value. The number M of the output of the relevant benefit is the path number (estimated by the path number), and the Yishan is not on the „丁1古4' By calculating the symbol peri〇d (sanipl ing) arrow; Ηί ,, ιλ· θ η ρ ingj 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收μ, the initial estimated value of the characteristic parameter, the above-mentioned propagation path characteristic estimation means according to the road *}· u π » the number of protections and the initial estimated value and the former honesty of the county by the error calculation means Receiving the difference between the quantized signal and the copy signal, the foregoing characteristic parameter is updated. 100120126 1003289530-0 201220748 Viewpoint. The pass-through transmission sequence is operated by means; the fourth aspect of the invention is the second view or the third message. The signal generating means includes: a constant envelope modulation means for differentially adjusting the envelope modulation of the difference between the differential operation and the operation result of the differential operation means. A fifth aspect of the invention is the wireless communication system of the fourth aspect, wherein the candidate value of each value χ[η] of the transmission sequence is any two of two values, and the differential operation unit performs a formula for performing parity according to n (1) or a differential operation of any one of the formulas (eq2), the constant envelope modulation means is an FM modulation of a modulation index of 0.5, ... the ad conversion means is by comparison The value of the amplitude of the received signal and the predetermined value are given to one of the candidate values, and the S-bit analog-to-digital analog-to-digital conversion process is performed as follows. The sixth aspect of the present invention is a transmitter. It is a transmission signal for transmitting the corresponding transmission sequence x[n] (n = 〇, ..., number) to the receiver wireless communication, and each * χ [η] of the transmission sequence is a plurality of ^ "one of the values" in each of the foregoing Alternate The box coupon recovery value has a one or more digits. The receiver has a receiving antenna that receives the aforementioned transmission signal transmitted by the aforementioned transmitter; and receives the quantized AD received in the aforementioned receiving antenna. Converting the hand, today, +, 4 μm on the $mm money has: by means of the phase "^ 疋 envelope modulation processing to generate the aforementioned signal transmission means = narration receiver transmission of the aforementioned transmission signal From the time series tn, let the ώ generate the phase of each n of the above-mentioned transmission sequence as one of the phases given to each value X[n] of the pair 1, so that at time 1001201:26 1003289530-0 201220748 price (10) The envelope is constant at the same value as the envelope of the time tn or tn, and the constant envelope modulation process is performed. The seventh aspect of the invention of the present invention is that the propagation path characteristic estimating apparatus > = the machine generates and performs wireless transmission according to the transmission sequence, so that: = is received. The signal estimates the characteristics of the propagation path, and the above-mentioned transmission order = ^ ' Ν is a symbol number) is a plurality of candidate values, and the candidate values are given in advance to the μ古μα一"η 艽鸲The plurality of phases, the monthly transmission sequence is the known sequence of the aforementioned transmitter skins s, two, and other receivers, and the description of the transmitter is that the transmitter has a value according to the phase. The variable processing generates the tons of the above-mentioned transmission signals... the means for generating each line number; the transmitter U 9 when the transmitter transmits the aforementioned transmission signal to the receiver... The means for generating the return signal is by means of the inter-sequence tn The phase in each of ten occupies & ^ ^ j ^ is the phase assigned to each value x[n] corresponding to the aforementioned transmission sequence, and the 乩 令 时刻 时刻 时刻 时刻 U U U U U U U U U U U U U U U U U U U U U U U U U U U U Or tn to round off the blush a I, the same value of the α line and be sure to enter the aforementioned constant envelope modulation process, before the Τ, do not get the receiver has: via the propagation path ^ ^ + , , ^ Describe the receiving antenna of the transmitted signal; it will receive in the receiving antenna just mentioned The ^^ · 唬 唬 并 并 并 并 并 并 并 产生 产生 AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD AD The initial value of the initial estimation value of the characteristic parameter of the characteristic of the propagation path, ^, the initial evaluation of the juice value calculation means; the known signal indicating the aforementioned known sequence will be determined by the gentleman am Μ 由 by the characteristic parameters of the other description Estimating the received signal obtained by the propagation path | D. A u quantizing and generating a copy signal generating means for copying the signal; calculating the error calculating means for the difference between the received and the previously copied signal; using by ^ The above-mentioned 100120126 1003289530-0 10 201220748 leaf value calculation: the difference between the number and the aforementioned copy signal updates the aforementioned characteristic parameter leaf operator: segment 'the aforementioned copy signal generation means uses the aforementioned estimation signal γ means The updated characteristic parameters further generate the eighth viewpoint of the foregoing copy transmission as a propagation path characteristic estimation method, and the obtained: column generation and non-existence Line transmission, using the receiver to connect =[:]?? to estimate the propagation path (4) characteristics, the above transmission sequence Ο ,, in ... 'Bu 1^ is the number of symbols) for the plurality of candidate values of the aforementioned = value pre-employment Corresponding to the one or a plurality of phases, the known two-way t-feeder pre-mastered by the serial transmission transmitter and the receiver has: a transmitting antenna that transmits the transmission signal by performing a strange envelope adjustment according to the phase No. = hand# again; for the above-mentioned receiver, the time sequence 令 令 令 令 令 令 令 令 令 令 令 令 令 令 令 令 令 产生 产生 产生 产生 η η η η η η η η η η η η η η η η η The same value as the aforementioned strange envelope modulation processing m line at the time tn^tn ^ time (6) and the 'predetermined' path reception by the aforementioned transmitting antenna is: having a propagation path to be in the aforementioned receiving antenna Received receiving signal = receiving antenna; signal AD conversion means; estimating front, f, quantifying and generating receiving quantization characteristic estimating means, initial characteristic The known signal of the parameter will With the former ':; 11 represents the parameter determining the known sequence of the propagation path estimation 100 120 126 201 220 748 1003289530-0 produce an error signal value of a difference between the signal and calculates the hand count step; means updating step. In order to make the brain readable (eql) (eq2) 3: quantify and generate a copy of the copy signal, the leaf calculator e", the quantized signal and the aforementioned copy signal, the propagation path characteristic estimation method includes

The segment updates the estimated value of the foregoing characteristic parameter using the difference of the received L signal obtained by the foregoing error calculating means: the number generating means further generates the eighth view of the copy signal by using the aforementioned estimated value to calculate the 'fortunate number': The ninth point of view is that a program 'is implemented in the propagation path characteristic estimation method of the eighth point of the computer. Further, it is also possible to grasp the invention of the present invention by recording the recording medium of the program of the ninth viewpoint (stablely). [Formula 1] ^[«] * Χ[η ~ 1] [Effect of the Invention] According to the present invention, a transmission signal is generated by performing constant envelope modulation processing in accordance with the phase. The transmitted signal tracks different paths and arrives at the receiver. Since a plurality of waves arrive in the receiver, the amplitude of the received signal is combined and varied by the plurality of waves. Because of &, the quantization noise is significantly generated by the amplitude. In particular, quantization noise is significantly generated in low resolution ADCs. However, as in the case of the present invention, by performing a constant envelope modulation process using a phase without using an amplitude, even a low-resolution ADC can avoid quantization of noise and realize high-precision communication. Further, by using 100120126 1003289530-0 201220748 •• resolution ADC' in the receiver, the circuit size of the receiver can be greatly reduced. In particular, the use of the 丄 bit adc does not require gain adjustment (AGC: Automatic Gain Control) under the receiver, which is advantageous for low power consumption. Further, by the invention of the present invention, high-precision wireless communication can be realized by performing constant envelope modulation processing according to the phase. Therefore, not only the propagation path is estimated by the initial estimation value, but also the propagation path estimation can be performed with higher precision by performing the repeated calculation. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Further, the invention of the present invention is not limited to the embodiment. [Embodiment 1] Fig. 1 is a block diagram showing the outline of a wireless communication system 1 of an embodiment of the invention. The wireless communication system includes a transmitter 3 and a receiver 5. The transmitter 3 transmits a transmission signal. The receiver 5 receives the signal transmitted by the ◎ via the propagation path 7. First, the configuration and operation of the transmitter 3 will be described. The transmitter 3 includes a transmission signal generating unit 1 that generates a transmission signal corresponding to the transmission sequence (an example of the [signal generation means] in the patent application scope of the present application), a power amplifier 13 that performs power amplification of the transmission signal, and a transmission power amplifier. The transmission antenna 15 of the output of 13 (an example of [transmission antenna] in the patent application scope of the present application). In this example, the channel estimation (channei estimation) is used for 100120126 1003289530-0 201220748. The known sequence Χ[ η ] is passed through the formula right ( (, U gives 。. Here η is the symbol number, η = 〇' . ; 'Ν-ΚΝ is the number of symbols). Further, in the present embodiment, let X [possible & va丨Ues) 4 } or " (an example of [plurality of candidate values] in the patent application of the present application). The transmission signal generating unit 1G includes a strange envelope modulation unit 19 that performs the strange envelope modulation processing, and a transmission sequence assignment unit 17 that supplies the constant envelope modulation unit Μ transmission sequence X[n]. The constant envelope modulation unit Μ includes a differential calculation unit 2 that performs a differential calculation of the equation (1) on the transmission sequence given by the transmission sequence assignment unit 17 (an example of the [differential calculation means] in the patent application scope of the present application] The output signal waveform of the differential operation unit 2〇 is formed into a pulse waveform shaping unit 23 that performs a band-limited pulse sequence (pda sequence); the output signal s(t) of the pulse waveform shaping unit 进行 is adjusted. The fm modulation unit 25 of the FM modulation variable of the index 0 5 (an example of the [constant envelope modulation means] in the patent application scope of the present application). The pulse waveform shaping unit 23 uses, for example, a Gaussian function "(10) "丨(10) function). It is a filter for impulse response (ilnpulse resp〇nse). This filter has the effect of suppressing the out-of-band spectrum of the FM modulated output. Next, the operation of the constant envelope modulation unit 19 will be specifically described with reference to Figs. 2 and 3 in the case of the transmission sequence χ [ n ] = 丨丨, 丨, i, L L 1' -1' -1}. After the differential calculation unit 2 performs the differential calculation, the output waveform of the FM modulation unit 25 can be obtained as shown in Fig. 2 when the modulation unit 25 performs the FM modulation of the modulation index 〇. For time, the vertical axis represents the amplitude. The two lines 疋 represent the signals of the 丨 phase and the 卩 phase of the output signal represented by the complex number. 100120126 1003289530-0 14 201220748 This case does not require the receiver to: FM demodulation (non-linear demodulation) Fig. 3 shows the correspondence with the phase for the output waveform of Fig. 2. The phase in the present embodiment is 〇, "2, π, and 3"2. Each is set to phases a, b, and Ch. Let the phase ... correspond to χ [ , the candidate value phase C and the DM candidate value - 1 (that is, each complement value of χ [η] is given two phases in advance.) At each time of the time series tn, the transmission is performed. Sequence 丨, 丨, 〗, work

15 L is assigned phases A, B, a, B, a, B, C, and d, respectively. The @自 waveform and the @3# arrow of Fig. 2 are changes in the phase displayed in the interval a h to each phase. Then, the constant envelope modulation processing is realized by making the envelope at the time Utn - Kt^tn) the same as the envelope of the time tn. [Formula 2] ^[»]e {l,-lX« = 0,...5A^_i) (1) ^[«]={ χ\η\*χ{η-\] η: even number / * X[n\ * χ[η -1] n: numj) er ( 2 ) Next, the configuration and operation of the receiver 5 will be described. The receiver 5 匕 3. The receiving unit 31 that receives the transmission signal transmitted by the transmitter 3 and performs signal processing, and the propagation path characteristic estimating unit 3 that estimates the characteristics of the propagation path 7 (the propagation path characteristic of the patent application scope of the present application) Estimation means], an example of [propagation path characteristic estimating device]. The receiving unit 31 includes a receiving antenna 35 that receives a transmission signal transmitted by the transmitter 3 via the propagation path 7 (an example of a [receiving antenna] in the patent application scope of the present application); an analog processing unit 37 that performs analog processing; and a quantization analogy of 100120126 1003289530 -0 201220748 The low-resolution ADC 39 of the output of the processing unit 37 (an example of the patent application range of the present invention: an [AD conversion means] of 乂); and the digital processing unit 41 that performs digital processing on the quantized signal. The analog processing unit 37 includes a portion 43 including an LNA (Low Noise Amplifier) or the like; a frequency conversion (MIX) to an MIX portion 45 of an intermediate frequency (IF: intermediate frequency) band; The BPF (Band Pass Filter) removes the BPF portion 47 of the noise outside the signal band. The low resolution A D C 3 9 is an analog digital conversion for performing low quantization bits (e.g., 1-bit, etc.). The ADC quantizes the value of the amplitude of the received signal. The phase is quantized in the present embodiment, particularly in the case of an i-bit ADC. By using a low resolution ADC in the receiver, the circuit size of the receiver can be greatly reduced. Moreover, especially in the case of using an i-bit ADC, it is not necessary to adjust the gain under the receiver, which is advantageous for low power consumption. However, 疋' produces quantization noise in low resolution A]) C39. Quantization noise is typically generated in AD conversion. In particular, in the low-resolution ADC, the envelope amplitude of the transmitted signal is significantly constant. However, tracking different locations, multiple waves will arrive. Therefore, the amplitude of the received signal is combined and varied by the plurality of waves. As such, the quantization noise is significantly generated by the amplitude. Therefore, as in the case of the present invention, by performing the strange-defined envelope modulation processing using the phase, even in the case of a low-resolution 纟 ADC, the generation of quantization noise can be suppressed, and communication with accuracy can be realized. The digital processing unit 41 includes: a digital buffer portion 49 that converts the signal frequency of the IF band into a baseband ▼; an output of the digital Mu portion 100120126 1003289530-0 201220748 signal, and a low-pass filter processing unit 51 ( The wheel of the LPF unit 51 is an example of a low-pass wave quantization signal. The [received next] of the patent application scope of the present invention will be described with reference to Figs. 4 and 5 for the configuration and operation of the transmission. According to the Αρη, the propagation path characteristic estimating unit 33 does not have a known sequence of the sheep grip. The parameter He[i] of the propagation path pulse response model (Propagation path Ο -^ reSP〇nSem〇del) (refer to FIG. 4) of the estimation formula (3) in the search curve characteristic estimating section 33 of the etched m (Example of [characteristic parameter] of the patent application scope of this section). Here, M is the road acquisition number indicating the propagation path impulse response model. Τ is the symbol period. [Formula 3] ^)=Σ^Μ-ίΤ] 丨_=〇(3) The propagation path characteristic estimating unit 3 3 has an initial estimated value calculating circuit 61 that determines an initial estimated value of the parameter He[l] based on the received quantized signal. (An example of the [initial estimated value calculation means] of the patent application scope of the present application); the known signal showing the known 〇 sequence will be quantized and generated by the estimated received signal obtained by the estimated propagation path determined by the parameter He[i] The signal replica generation unit 63 (an example of the [copy signal generation means] in the patent application scope of the present application); the error calculation unit 65 that calculates the difference between the received quantized signal and the replica signal (the error calculation means of the patent application scope of the present application) An example of the estimation value calculation unit 67 for determining the new parameter He(1)[i] using the difference update parameter He[i] of the received quantized signal and the replica signal (the estimated value calculation means of the patent application scope of the present application) An example). The replica signal generation unit 63 further generates a complex number by using the estimated value of 100120126 1003289530-0 17 201220748; the value scale; the number of the calculation unit 67 (the updated parameter H^Ji). On the day of the pp, you can praise the county, even if you lower the resolution ADC, you can avoid the miscellaneous aft 'month t* south of the choice; 隹 ^ thousand value technology threshold accuracy into the 仃 迗 receiving. Therefore, In the propagation path estimation unit 3 3, the statistic is calculated by repeating the calculation, and the characteristics of the radii 7 can be accurately estimated. The semaphore will sample the signal of the received quantized signal by the symbol period to represent Y [ η ]. Initially estimated 佶 瞀 瞀 e, two. military tube ... ten different circuit 61 for Y [n] to formula (4) related to the initial evaluation of the value ... Ν is the number of known symbols

Is the number of correlators, and the right M L has a relationship of Μ = L. The path number M can be given, for example, a sufficiently large value to be r2. And B recognizes and 'outputs He[i] to exceed the number of correlators AMM |V ^ at the end of I Th and avoids the value of the threshold value ( (also just exceeds the output of a certain threshold τ correlator) The biggest ^ in the print] is W or OK. The initial estimated value calculation of the initial estimated value calculating circuit 6i n will be described with reference to Fig. 5 as an example of the initial estimated value calculating circuit 61 of Fig. 1. The initial estimated value calculation circuit e a human μ > 1 and has L correlators. That is, including L multipliers 93!,·.., 93l, 盥钟筲々士1, (10), and differently for the received quantized signal 1[1〇 multiplied by YLn+i] The average L· average calculation unit 95 ... , , . . . , 1, 9 5 l of the results of the multipliers 93, . According to this, the output He[ij. of each correlator is obtained. [Formula 4]

He^\ = -rfYJY\n + i]^[n\ = 〇,·.·,#-ι, (4) The replica signal generation unit 63, the error calculation 邱 丨 0 丨 6 5 and the estimated value calculation unit 67 are The initial value calculation circuit 6 丨 determines the H e [ 1 ] as the initial value 100120126 1003289530-0 201220748 (initial value), and propagates the estimation of the characteristic of ^. For an example of its composition and operation, ~_ 】 and 5 children. The I signal generating unit 63 generates a known signal fi{). The known signal generating unit 6 of Putian, °, calculates the electric value using the initial estimated value. He[i] is used as the estimated propagation path k, and the estimated propagation path portion 7 of the signal after the known signal is estimated by the propagation path; the signal of the t-channel of the propagation path portion 71 The quantized quantizing unit 7 3; performs the anger, the 仃 Μ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The respective replica signals generated by the replica 3 generating unit 63 corresponding to the transmitter 3, the propagation path 7, the low-resolution ADC 39, the digital unit, and the [" portion can be said to use the estimated propagation, #now and (4) quantized signals. The same environment. The error calculating unit 65 calculates the difference between the replica signal and the received quantized signal. The estimated value calculating unit 67 obtains, for example, a mean square error (MSE: Mean Square Error) of the copy signal and the received quantized signal to derive a parameter of the channel whose mean square error is the smallest. The parameter derivation method can be, for example, an inverse calculation method according to the LMS algorithm (Least Mean Square algorithm), and the equation (5) is an example of the parameter update equation. The estimated value calculation unit 7 performs a repeated calculation for updating the parameters for each W symbol. When set to W = 1, it is the same as the usual [MS algorithm. Here, e(L)[n] is an error value indicating the nth symbol in the first iteration. // is the step size. The replica signal generation unit 63 regenerates the replica signal using the updated He(L + 1)[i]. Repeat the above repeated calculation until the mean square error value becomes sufficiently small. 100120126 1003289530-0 201220748 [Formula:, ^, +1) W = 1: Σ + mnW + i] (5) Next, the simulation (si mu 1 ati on ) evaluation using the channel estimation technique of the present embodiment The result is explained. Fig. 6 and Fig. 7 are diagrams showing characteristic evaluation by computer simulation (compUter simuiati) for evaluating the accuracy of propagation path characteristics. Although the number of quantization bits of the ADC is one bit, it is possible to use two or more bits. Let the modulation index in the FM modulation be 〇.5. Aquasi-static Rayleigh fading propagation path is assumed to be an equal level 6 path. After transmitting the known signal estimation propagation path characteristics, a nonlinear equalization is performed according to the maximum likelihood sequence estimation. Fig. 6 is a block diagram showing a wireless communication system ι〇1 which is an object of simulation. Transmitter 1〇3, propagation path 107, receiver ι5, transmission sequence assignment unit 111, differential operation unit 、3, fm modulation unit 153, power amplifier 117, transmission antenna 119, and receiving antenna of FIG. 121, analog processing unit 123, low-resolution ADC1 25, digital processing unit! 27. The propagation path characteristic estimating unit 129 corresponds to the transmitter 3, the propagation path 7, the receiver 5, the transmission sequence providing unit 17, the differential operation unit 20, the FM modulation unit 25, the power amplifier 13, and the transmission of FIG. The antenna 15 and the receiving antenna 3 5 'the analog processing unit 37, the low-resolution ADC 39, the digital processing unit 41, and the propagation channel characteristic estimating unit 33. Moreover, the wireless communication system 1 0 1 includes the maximum possible sequence estimator (such as 100120126 1003289530-0 20 201220748 chemist) 1 31 6 propagation path 1 The impulse response of Q7 is transmitted through the path interval a T=l. 5T, the number of paths A function of κ = 6 (6) is given. Here, κ is the number of paths of the impulse response of the propagation path 1〇7 assumed in the simulation. Let the amplitude value (complex) of each path be a random variable (st〇chastic variable) that follows the Rayleigh distribution with the same average value. The impulse response model in the propagation path characteristic estimating unit 1 29 uses a function (4) of the path interval τ and the path number M = 9. The maximum possible sequence estimator 131 is known to have a high probability that the characteristics of the propagation path 107 and the configuration of the transmission receiver are 'received from a plurality of transmission signal candidates. The maximum possible sequence estimator 131 calculates a plurality of transmission signal candidates 1, ..., J by the error calculators 137l, ..., 137; respectively, via the estimated propagation paths 133, ..., 133], and quantizes them via low resolution. The error between the subsequent signals and the received quantized signal is selected by the selector 139 to select the smallest error. The channel estimation in Fig. 6 is that the pulse waveform shaping section of Fig. 1 is not used. The constant envelope signal can be expressed by the formula (7). Here f (t) is the formula (8). Moreover, to transmit the carrier frequency of the signal (carrier ❹ frequency) ° [Equation 6] h^Y^mt-iAT) 1=0 ( b ) (7) Z(t)= tx[2n]f(t-2nT) Cosact+ tx[2n + l]f(t-(2n + l)T)s^ct tt=—〇〇nsz^〇〇m=

0 < ί < 2T otherwise (8) 100120126 1003289530-0 201220748 FIG. 7 is a BER (Bit Error Rate) characteristic showing a case where the maximum possible sequence estimation is performed using the estimated value of the propagation path characteristic. The Ideal Channel is a BER characteristic that shows a situation in which the characteristics of the propagation path can be completely estimated. In order to use the initial estimate when the Correlator Estimator is used, the Adaptive Filter Estimator performs the characteristics of the estimated case based on the least square error reference. Although the relevant estimator can be implemented even by conventional techniques, the error will be greatly developed. On the other hand, in the adaptive filter estimator, a BER characteristic which is substantially equal to the case where the estimation of the propagation path characteristics is complete is obtained. Further, for example, as shown in Fig. 8, a plurality of known signals are transmitted, and the effects of the noise can be mitigated by averaging the signals in the ADC output of the receiver. In the case where the known signal χ[η], n = 0, 丨, ..., N-1 is repeatedly transmitted U times, the corresponding received signal is 兮(4)[n]. The noise can be mitigated by averaging as in equation (9). This signal is input to the propagation path characteristic estimating unit 33 of Fig. 1 and the propagation path characteristics are estimated. Alternatively, the signal may be input to the propagation path characteristic estimating unit 33 of Fig. 1 as a repeated known sequence of the length NxU of the equation (1 〇), and the propagation path estimation may be performed. [Formula 7] y[n] = ^ir{u)[n] (9) 1 7 (10) Further, the propagation path characteristic estimating section 33 is a transform pair of Fourier 1003289530-0 100120126 201220748 of the formula (3) (Fourier The frequency transfer characteristic of the transform pair is defined as a propagation path model, and its parameters are also ok. Further, the estimated value calculation unit 67 may use another method such as an RLS algorithm (Recursive Least Squares algorithm). [Embodiment 2] Next, other embodiments of the present invention in the sputum passage will be described with reference to Fig. 9 . When estimating the characteristics of the propagation path of ΜI Μ 0, for example, Time Division Multiplexing (TDM) transmits, for example, a plurality of known signals. Fig. 9 is a block diagram showing an example of a 无线I Μ 0 wireless communication system using the channel estimation technique of the present invention in a ΜΙΜΟ channel. The number of transmit antennas in the system is 2, and the number of receive antennas is 2. Further, any value of the number of transmission antennas Ntx and the number of reception antennas Nrx may be one or more, respectively. The number of transmission antennas may be larger than the number of reception antennas (Ntx > Nrx), and may be smaller than the number of reception antennas (Ntx < Nrx).不同 Transfer the different transmission sequences A, B to the ΜΙΜΟ propagation path 216 in the MIM 〇 conveyor 215. The transmission sequences A and B each reach the receiving point through different propagation paths. A composite wave of the transmission signal A passing through the propagation path 11 and the transmission signal b passing through the propagation path 21 is received in the receiving antenna 1. On the other hand, a composite wave of the transmission signal A passing through the propagation path 12 and the transmission signal B passing through the propagation path 22 is received in the receiving antenna 2. By transmitting known signals in an orthogonal relationship to the propagation paths 11, 12, 21, 22, the propagation path η, 2 is estimated in the propagation path characteristic estimating unit 225i, and the propagation path is estimated in the propagation path 100120126 1003289530-0 23 201220748 In the case where the number of the antennas is estimated to be three or more in the case where the number of the antennas is equal to or greater than the number of the antennas. The line "maximum possible sequence estimator 222" is characterized by 瞧 and the transmitting receiver 215, 2 broadcast path 216 'i. -xt ^ ^ i £ J , 冓 becomes known, from a plurality of telemetry sequences (4) The possibility is that the candidate for the transmission signal is 1, 2, · · · Τ ] 5 y* . , , 3 and 7 transmission signal β is 1, 2, ... J2 transmission signal A, Β The total number of α, 且, and α is Q. The Q candidate waves are each estimated to be estimated by the propagation path 226ι, ..., 226〇. The error calculation unit 2281, ... 228. The calculation is performed via the low resolution quantizers 2271, ..., The error between the signal after 227q and the received signal. The selector m selects the smallest error. The combination of the transmission signal A and β. [Embodiment 3] Next, referring to Fig. 1〇~12 for the invention of the present invention in the (10) channel The embodiment is described in the context of a code division multiplexing (CDM: C〇de Division MultipUxing) transmission. The invention can use a transmission method in which a plurality of known signals are in an orthogonal relationship. A diagram showing the concept of known signal transmission using code division multiplexing. By transmitter 301 The two transmit antennas will be sent according to the known signals 303i and 3032 generated by the transmission sequence VIII and β. In the present embodiment, the signals 303 > 3032 are known to be in mutually orthogonal relationship (c〇de) ^ For example, a cyclic sequence (cyclic sequence of cyclic 讣) can be used. A sequence that is cyclically shifted refers to a sequence in which the first element is shifted, and the first element is the next element of the last element. For example, by pairing the sequence A, b, c, D, E, F are cyclically shifted 'as E, F, A, B, c, D. Then, the receiving antennas of the receiving sections 3〇7i 100120126 1003289530-0 201220748 and 307z are respectively received via The transmission signal after the MIM 〇 propagation path is then processed for each received signal, the receiving units 3〇7 and 3〇72, and the propagation path characteristic estimators 309! and 3〇92. FIG. 11 is a receiving unit using FIG. A schematic block diagram of the processing performed by the propagation path characteristic estimating unit 309!, and the processing performed by the receiving unit 3072 and the propagation channel characteristic estimating unit 3〇92 in the figure can be similarly realized. In Fig. 11, The configuration of the transmitter 310 and the mim of FIG. The transmitter 215 is the same. The known signals 3031 and 3032 of the known sequence persons and 8 of Fig. 9 are generated. The receiver 332 includes a receiving unit 307i and a propagation path characteristic estimating unit 3〇9 wide receiving unit 307l. The receiving unit 31 of Fig. 1 is the same. The propagation path hollow characteristic estimating unit 3 0 91 includes an initial estimated value calculating circuit 351 'copy signal generating unit 353, an error calculating unit 355, and an estimated value calculating unit 357. The initial estimated value calculation circuit 351 is the same as the initial estimated value calculation circuit 61 of Fig. 1 . The replica signal generation unit 353 includes the known signal generation sections 359i and 359^ estimated propagation path sections 361 and 361?, the adder_, and the quantization section.

a digital MIX unit 367 and an LPF unit 369. The quantizing unit 365, the digital MIX P and the LPF unit 369 are the same as the quantizing unit 73, the digital unit IX unit 75 and the LPF unit 77 of Fig. 1, respectively. The known signal generating portion 3591 generates a known signal indicating the known sequence, J Α . When the γ[η] in FIG. 5 is the known sequence α, the estimated propagation path portion 361ι uses the Heil(1) determined by the initial estimated value calculation circuit 351 as an estimated 100120126 1003289530-0 25 201220748 propagation path, A, which is known. The signal generation unit generates a signal of the situation after the propagation path I is generated, and the first antenna of the signal receiver, the first antenna of the P*MIM0 transmitter, and the signal generation unit. The known signal path portion 3612 is also :::: a known signal of sequence B. The estimated initial estimated value γ[η] of the propagation is the known sequence ", the Ηρ path determined by the τ value calculation circuit 351 is generated, and the 匕 is generated as the estimated propagation signal 经由 经由 via the estimated value of the last Μ 器After the ten propagation path 21 (that is, the estimated propagation path from the heart of the burst to the first antenna of the receiver), the phase detector 363 will estimate the propagation path.

The portion 369 performs the same processing as that of Fig. 1 on the signals of the addition, the digitization unit, the digit 67, and the LPF replica signal generation 363. Therefore, the dissemination of the road, and then; = = the birth of the copy signal can be said to be the use of estimates: the boat is now the same environment as the Donghua signal received. The error calculation unit 355 calculates the difference between the replica signal and the received quantized signal. The estimated value calculation unit 357 seeks, for example, the mean square of the reproduced signal and the received quantized signal = ' Ε — - the parameter of the channel whose mean square error is the smallest. The parameter derivation method can utilize, for example, a repetitive calculation based on the LMS algorithm. Equations ^12) and (13) are examples of parameter update equations. The estimated value calculation unit 357 performs the reverse calculation for updating the parameters for each w symbol. When set to W=1, it is the same as the normal LMS algorithm. Here, eil(L)[n] and e21(L)[n] are error values indicating the nth symbol in the first iteration. // is the step size. The replica signal generation section 353 regenerates the replica signal using the updated Hen (L + 1) [i] and He21 U + n[ i ]. Repeat the above repeated calculation until the mean square error value becomes sufficiently small. 100120126 1003289530-0 26 201220748 [Formula 8] (11) (12) W = fix, [nW + i^[„w + i] H^]}] = ΗΪΙΜ^-^γ^Χ2[ηψ + i^\ The simulation evaluation of the channel estimation technique of nW + i] π i = 0 is next explained by using the actual example, the W money evaluation result. Fig. 12 is a diagram showing the estimation of the maximum possible sequence using the estimated value of the propagation path characteristic. The BER characteristic is plotted on the graph. The horizontal axis is 〇EWdB), and the vertical axis is 顺. [Ideal channel] is a quadrangle line showing the salience of the case where the propagation path characteristics can be completely estimated. [Channel using CDM signal] Estimate] is displayed in a triangle line, through CDM to subscribe to the transmission of known signals and to carry out the transmission of the road:: (4): sex, use the channel of the signal to estimate u to circle;: the line is not wrong It is known that the transmission of the signal and the propagation of the sex = the estimation of the characteristics of the situation. Although the amount of m is equal to 1 bit, but it can be more than 2 bits. Let FM be 0.5. Assume the equivalent level 4 The quasi-static Rayleigh decline of the path: tune 3 = yes: after the signal estimates the propagation path characteristics, the estimated nonlinearity of the 3 and 2 columns... Day of sending and receiving = sequence root. In the CDM, the BER characteristic of the tool with the propagation path characteristic is obtained as the same. The case of the whole is roughly the same as the outline of the drawing. FIG. 1 is a diagram showing the wireless embodiment of the present invention. Communication system 100120126 1003289530-0 27 201220748 The block diagram of the element, iW; · i ..... .-' The output waveform of the part 10 is shown as an example of the transmission signal of the display picture. Fig. 2 is a diagram showing the correspondence relationship between the output wave, e 7 /, and phase. 疋 The propagation path pulse used in the estimated propagation path portion 71 of Fig. 1 is shown by the temple. The parameters He[i] and M. 妒 Π: show the schematic block diagram of the initial estimated value calculation circuit of Fig. 1. An example of the initial value estimate f calculation circuit 91. & 1» 疋 不 成为Block diagram of the wireless communication system of the object 101. Figure 7 is a BER characteristic showing the case of using the estimated value of the propagation path characteristic for the maximum possible sequence estimation. 疋"The example shows the effect of using a plurality of known signals to mitigate the influence of noise. A schematic block diagram. A schematic block diagram showing the known signal transmission of time division multiplexing/other embodiments of the present invention in the ΜΙΜΟ channel is shown. Fig. 10 is a diagram showing the concept of known signal transmission by the g k code of the still other embodiment of the present invention in the ΜΙΜ〇 channel.

Fig. 1 1 BB 4A 疋 Regarding the use of the receiving unit 3 0 7] of FIG. 10 and the propagation path characteristic estimation. A schematic block diagram of the processing performed by 卩3091. Fig. 1 is a graph showing the BER characteristics of the case where the maximum value of the propagation path characteristics is estimated using the estimated value of the propagation path characteristics. [Description of main component symbols] 100120126 1003289530-0 28 201220748 1,1 0 1 : Wireless communication system 3, 103: Transmitter 5, 1 0 5 : Receiver 7, 1 0 7 : Propagation path 1 0 : Transmit signal generation section 13, 117: power amplifiers 1 5, 11 9 : transmission antennas 1 7 and 111 : transmission sequence assignment unit Ο 1 9 : constant envelope modulation units 20 and 113 : differential calculation unit 2 3 : pulse waveform shaping unit 25 115: FM modulation unit 31, 307: receiving unit 33, 129, 225, 309: propagation path characteristic estimating unit 3 5, 1 2 1 : receiving antenna 3 7 , 1 2 3 : analog processing unit

Q 39, 125: low-resolution ADC 41, 1 2 7: digital processing unit 43: RF unit 4 5 : Μ IX unit 47: BPF unit 49, 75, 361: digital MIX unit 51, 77, 369: LPF unit 61, 3 5 1 : Initial estimated value calculation circuit 100120126 1003289530-0 29 201220748 6 3, 3 5 3 : copy signal generation unit 65, 355: error calculation unit 67, 357: estimated value calculation unit 69, 359: known signal generation unit 71, 1 3 3, 3 61 : estimated propagation path sections 73, 365: quantization sections 135, 227: low resolution quantization 137, 228: error calculation 130, 229: selectors 215, 301: ΜΙΜ 0 transmitter 21 6: ΜΙΜΟ Propagation path 221: ΜΙΜΟ receiver 226: ΜΙΜΟ estimated propagation path 100120126 1003289530-0 30

Claims (1)

201220748 VII. Patent application scope: 1. A wireless communication system, comprising a transmitter and a receiver, wherein the transmitter transmits a corresponding transmission sequence X[n](nO, , N-1, N by wireless communication to the receiver. For the transmission signal of the symbol number, each value X[n] of the transmission sequence is one of a plurality of candidate values, and each of the candidates is pre-supplied with one or more phases, and the transmitter has: a signal generating means for generating the transmitted signal by performing an envelope modulation process according to the phase; and transmitting a transmitting antenna for transmitting the signal to the receiver, the signal generating means by time series h, making each time The phase in L is π which is given the phase corresponding to each value χ[η] of the transmission sequence. The envelope is at the time t(tn-Kt<tn) with the time ^ or ^. The same value of the line and must be 'performed to the constant envelope modulation process, the receiver having: a receiving antenna that receives the transmitted signal transmitted by the transmitting antenna via a propagation path; and a receiving received in the receiving antenna The signal quantizes and generates an AD conversion means for receiving the quantized signal. 2. The wireless communication system of claim 2, wherein the transmission sequence is a known sequence pre-held by the transmitter and the receiver, the receiver having propagation path characteristic estimation means for estimating characteristics of the propagation path, The propagation path characteristic estimation means has: 100120126 1003289530-0 201220748 垓 Receive the quantization signal, and the initial meaning of the characteristic parameter indicates that the initial value of the mouth value of the propagation path characteristic indicates that the known sequence has been calculated. Means; an estimate of the estimated propagation path; 10: will be generated by means of the complex signal by the characteristic parameter. The received number is quantified and the complex signal is generated to calculate the received quantized signal and the complex; The difference error calculation hand of the 唬 uses the received quantized signal and the estimated value calculation means of the complex number, and the difference of 唬 updates the characteristic parameter. The copy signal generating means uses the characteristic parameter estimated by the estimator to update 7 The copy signal is generated. 3. The method for calculating the wireless initial estimation value according to item 2 of the patent application scope has L correlators, wherein the first number of the L correlators exceeds the specified number of outgoing channels is the number of paths. Estimating, the correlation of the correlator is performed by performing a correlation operation on sampling the received quantized signal by a symbol period 'determining an initial estimated value of the characteristic parameter, signal YU>, the propagation path characteristic estimating means is based on the path number Μ and calculating by the error The difference between the received initial estimated value signals obtained by the means updates the characteristic parameter. The s number and the copy 4, as in the second or third of the patent application scope, wherein the signal generating means has: a wireless communication system, a differential operation method for performing a differential operation on the far transmission sequence; and a pair indicating The calculation result j of the differential operation means is the dynamic operation signal into the 100120126 1003289530-0 32 201220748 line constant. The package. The constant chain modulation means of the chain i. 5. The wireless communication system of claim 4, wherein the candidate value of each value χ[η] of the transmission sequence is any one of two values, and the 3H differential operation unit performs the day-by-day g &疋 仃 仃 仃 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 The value of the amplitude of the J signal is processed as follows: (eq 1 ) ❹ 〇 The AD conversion means is a 1-bit analog-to-digital conversion that quantizes one of the corresponding candidate values by comparing the reception of a certain value. [Formula 1] Χ[η]*Χ[η-\} -1 * Χ\η] * Χ[η -1] (eq2 ) , 6, a transmitter that transmits to the receiver by wireless communication a transmission signal of the sequence Χ[η] (η = 0, ..., the number of symbols is a symbol number), and each value X [ n ] of the transmission sequence is one of a plurality of candidate values, and the candidate values are given in advance Corresponding to one or a plurality of phases, the receiver has: a receiving antenna that receives the transmitted signal transmitted by the transmitter; and The AD conversion means for quantizing the received signal received in the receiving antenna, 'the transmitter has: a signal generating means for generating the transmitted signal by performing constant envelope modulation processing according to the phase; and 100120126 1003289530-0 33 201220748 The transmission of the transmission signal: the transmission antenna, the signal generation means by means of the time sequence quot "n, "the phase is given the value corresponding to the transmission sequence χ time in the tn at the moment -Kt<tn) The middle envelope is the phase with the time ^, so that the same value is constant, and the envelope of the 彳f or n is entangled into the 仃忒 疋 envelope modulation process. 啄7, the propagation path (four) material 襄Set, send and generate wireless transmission, • Received by receiver: Sends the characteristics of the sequencer propagation path, and receives the ring number to estimate the value of the transmission sequence χ[η]((4),·..,Η] One of the plurality of candidate values, the sub-number is given to each of the candidate values minus one or more phases, and the transmission sequence is a known sequence that is pre-mastered by the transmitter and the receiver. The sending machine has: a signal generating means for generating the transmitted signal by performing constant envelope modulation processing according to the phase; and transmitting a transmitting antenna for transmitting the signal to the receiver, the signal generating means is by time series Let the phase in each time u be the phase given to each value χ[η] of the corresponding transmission sequence, so that the envelope at time t(tn-KtUn) is the same as the envelope of time tn-Ι or tn. And constant, the constant envelope modulation process is performed, the receiver has: a receiving antenna that receives the transmitted signal transmitted by the transmitting antenna via a propagation path; and a received signal quantized and generated by 100120126 1003289530-0 201220748 Quantity, 1 is an AD conversion means for connecting the sfl number in the receiving antenna, and the propagation path characteristic is estimated according to the initial estimated value of the received quantized characteristic parameter to represent the fixed estimated path of the known sequence to obtain the copy signal of the number The means for generating means has: a number to determine an initial estimated value calculation means indicating the characteristics of the propagation path; Quantified by the estimated received signal by the decision parameters and generate replicate News The difference between the digitized signal and the copy signal; and the error calculation hand. The copy signal generation means further generates the copy signal by using the characteristic parameter updated by the estimated value calculation means. 8. A propagation path characteristic estimation method, the transmitter according to the transmission sequence Generating the characteristics of the received signal estimation propagation path received by the wireless transmission receiver, and the values of the transmission sequence χ[η] (η = 〇, ..., Ν-1, Ν is the number of symbols) are plural One of the candidate values, wherein each of the candidate values is assigned a corresponding one or a plurality of phases, the transmission sequence being a known sequence previously grasped by the transmitter and the receiver, the transmitter having: being constant by phase The envelope modulation process generates the §fl generation means of the transmission 100120126 1003289530-0 35 201220748; and a pair of transmitting antennas for transmitting the transmission signal by the receiver, the signal generation means by time The sequence is such that the phase in each time 1 is given the phase of each i χ [η] corresponding to the transmission sequence, so that the envelope at time Uwt 仏 is the same value as the envelope of time L or "and Certainly performing the constant envelope modulation process, the receiver having: a receiving antenna that receives the transmitted signal transmitted by the transmitting antenna via a propagation path; in the receiving antenna The received receiving signal is quantized and generates an AD conversion means for receiving the quantized signal; and a propagation path characteristic estimating means for estimating characteristics of the propagation path, the propagation path characteristic estimating means having: determining a characteristic indicating the propagation path according to the received quantized signal The initial estimated value calculation means of the initial estimated value of the characteristic parameter indicates that the known signal of the known sequence is to be quantized by the estimated received signal obtained by the estimated propagation path determined by the characteristic parameter, and the copy signal generating means for generating the replica signal is generated. And calculating an error calculating means for the difference between the received quantized signal and the replica signal, the propagation path characteristic estimating method comprising: the estimated value calculating means using the difference between the received quantized signal and the copied signal obtained by the error calculating means An estimated value calculation step of the characteristic parameter; and 100120126 1003289530-0 36 201220748 The copy signal generating means further generates the step of copying the signal by using the characteristic parameter updated by the estimated value calculating means. In the patent application for causing the computer propagation range, Paragraph 8 channel estimation methods. 100120126 1003289530-037