JP2009118187A - Transmitter, receiver, transmitting method, receiving method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter, a receiver, etc. which improve communication performance when a technology for performing a time delay of one channel to the other channel is applied to a communication technology for using two channels such as W-CDMA. <P>SOLUTION: In the transmitter 131, a spreading part 133 spreads two signals synchronized by a unit of a chip time length, after a delay circuit 231 delays one signal by a half-chip time length, an HPSK modulation part 135 modulates the signals, an RF transmitting part 136 transmits the signals, and in the receiver 151, an HPSK demodulation part 153 demodulates the signal received by an RF receiving part 152, after a delay circuit 251 delays the other signal by a half-chip time length, a reversely-spreading part 154 reversely spreads the signals to obtain the two signals synchronized by the unit of the chip time length. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a transmission apparatus suitable for improving communication performance when applying a technique for time delaying one channel with respect to the other channel to a communication technique using two channels such as W-CDMA. The present invention relates to a receiving apparatus, a transmitting method, a receiving method, and a program for realizing these on a computer or a digital signal processor.

In W-CDMA, which is one of the standards for third generation mobile communication, primary spreading and secondary spreading are performed using the following two types of codes as spreading codes.
(1) OVSF code. A short-cycle orthogonal code with a data symbol length as a cycle.
(2) Scramble code (sc). Long period spreading code using gold code.

  Originally, the OVSF code is used to realize a plurality of channels. However, in the current W-CDMA standard, multiple channels are allowed only when communicating at a data rate of 960 Kbps. One DPDCH) and one control channel (DPCCH) are allocated to the I channel and the Q channel, respectively, by complex spreading.

  The length spreading factor (sf) of the OVSF code is 64 at a data rate of 60 Kbps. The OVSF code is generated by recursively applying an orthogonal function called a Walsh function, and there are as many variations as the length of sf.

  By default, in the case of a single channel, the sf / 4 number (16 in 60 Kbps) is used for the I channel, and the 0th code is used for the Q channel. The former is a sign in which positive and negative are inverted every two, such as 1, 1, -1, -1, 1, 1, -1, -1, ..., and the latter is 1, 1, 1, 1 , 1, 1, 1, 1,...

On the other hand, the inventor has proposed a technique for improving the performance by delaying each channel by a different time in communication using a plurality of signal channels, the details of which are disclosed in the following documents. ing.
Japanese Patent No. 3650821

  [Patent Document 1] proposes a technique for improving communication performance by determining the delay times of a plurality of synchronized signals by values obtained by nonlinear conversion.

  Therefore, when the invention according to [Patent Document 1] is applied in a more limited situation such as W-CDMA, it is determined what is selected as a nonlinear function, and the performance is further improved. There is a strong demand for technology.

  The present invention is for solving the above-described problems. When a technique for delaying one channel with respect to the other channel is applied to a communication technique using two channels such as W-CDMA. An object of the present invention is to provide a transmission device, a reception device, a transmission method, a reception method suitable for improving communication performance, and a program for realizing these on a computer or a digital signal processor.

  A transmitting apparatus according to a first aspect of the present invention includes an input receiving unit that receives input of two synchronized signals synchronized with each other in units of chip time lengths, and one of the two synchronized signals that has received an input to the other A delay unit that outputs two asynchronous signals delayed by a predetermined delay time length, a modulation unit that outputs two modulated signals obtained by modulating each of the output two asynchronous signals, and two output signals A transmission unit for transmitting the modulated signal is provided, and the predetermined delay time length is configured to be 0.3 to 0.7 times the chip time length.

  In the transmitting apparatus of the present invention, the two synchronized signals are an I channel signal and a Q channel signal after spreading by the OVSF code in W-CDMA communication and before spreading by the scramble code using the Gold code. Can be configured.

Further, in the transmission apparatus of the present invention, 0.5 times the chip time length is used as the predetermined delay time length, and the OVSF code of the OVSF code number 32 to 64 is used for the I channel. No. 63 is used, and the Gold code is obtained by applying a LSF (Lebesgue Spectrum Filter) filter with an autocorrelation coefficient ± (2-3 ^1/2 ) to one or more tap stages and the scramble code. Can be configured.

  A receiving apparatus according to another aspect of the present invention includes a receiving unit that receives two received signals, a demodulating unit that outputs two demodulated signals obtained by demodulating each of the two received signals, and two output signals A synchronization unit that outputs two synchronized signals obtained by synchronizing the demodulated signals with each other in a chip time length unit, and the predetermined delay time length is 0.3 to 0.7 times the chip time length; Configure to be.

  In the receiving apparatus of the present invention, the two demodulated signals are an I channel signal and a Q channel signal after despreading by a scramble code using a Gold code in W-CDMA communication and before despreading by an OVSF code. It can be configured to be.

Further, in the receiving apparatus of the present invention, 0.5 times the chip time length is used as the predetermined delay time length, and as the OVSF code, the OVSF code number 32 to 64 of the OVSF code for the I channel is used. No. 63 is used, and the Gold code is configured so that a scramble code is obtained by applying an LSF filter of one or more tap stages and an autocorrelation coefficient ± (2-3 ^1/2 ) to the Gold code. it can.

In the receiving apparatus of the present invention, 0.5 times the chip time length is used as the predetermined delay time length, and numbers 32 to 63 are used as the OVSF codes. Thus, the received signal can be configured to be subjected to an LSF filter having one or more tap stages and an autocorrelation coefficient ± (2-3 ^1/2 ).

  Further, in the receiving apparatus of the present invention, the OVSF code that despreads one of the demodulated signals is delayed by the predetermined time length compared to the OVSF code that despreads the other, thereby providing a chip time length unit. It can be configured to be synchronized with each other.

  A transmission method according to another aspect of the present invention includes an input reception step of receiving inputs of two synchronized signals synchronized with each other in units of chip time lengths, and one of the two synchronized signals received with respect to the other is assigned to the other A delay step for outputting two asynchronous signals delayed by a predetermined delay time length, a modulation step for outputting two modulated signals obtained by modulating each of the two asynchronous signals that have been output, and two modulations that have been output The predetermined delay time length can be configured to be 0.3 to 0.7 times the chip time length.

  In the transmission method of the present invention, the two synchronized signals are an I channel signal and a Q channel signal after spreading by the OVSF code in W-CDMA communication and before spreading by the scramble code using the Gold code. Can be configured.

Further, in the transmission method of the present invention, 0.5 times the chip time length is used as the predetermined delay time length, and numbers 32 to 63 are used as the OVSF codes. It is possible to configure the scramble code to have one or more stages and an autocorrelation coefficient ± (2-3 ^1/2 ) LSF filter.

  A receiving method according to another aspect of the present invention includes a receiving step of receiving two received signals, a demodulating step of outputting two demodulated signals obtained by demodulating each of the two received signals, and two output signals A synchronization step of delaying one of the demodulated signals with respect to the other by a predetermined delay time length and outputting two synchronized signals synchronized with each other in chip time length units, the predetermined delay time length being: The chip time length is configured to be 0.3 to 0.7 times.

  In the reception method of the present invention, the two demodulated signals are an I channel signal and a Q channel signal after despreading by a scramble code using a Gold code in W-CDMA communication and before despreading by an OVSF code. It can be configured to be.

Further, in the receiving method of the present invention, 0.5 times the chip time length is used as the predetermined delay time length, 32 to 63 are used as the OVSF codes, and taps are applied to the Gold code. It is possible to configure the scramble code to have one or more stages and an autocorrelation coefficient ± (2-3 ^1/2 ) LSF filter.

In the receiving method of the present invention, 0.5 times the chip time length is used as the predetermined delay time length, and numbers 32 to 63 are used as the OVSF codes. Thus, the received signal can be configured to be subjected to an LSF filter having one or more tap stages and an autocorrelation coefficient ± (2-3 ^1/2 ).

  In the receiving method of the present invention, the OVSF code for despreading one of the demodulated signals can be synchronized with each other in units of chip time length by delaying the OVSF code by the predetermined time length.

  A program according to another aspect of the present invention is configured to cause a computer or a digital signal processor to function as each unit of the transmission device and each unit of the reception device, or to execute the transmission method and the reception method.

  The program of the present invention can be recorded on a computer-readable information storage medium such as a compact disk, flexible disk, hard disk, magneto-optical disk, digital video disk, magnetic tape, and semiconductor memory.

  The program can be distributed and sold via a computer communication network independently of a computer or digital signal processor on which the program is executed. The information storage medium can be distributed and sold independently of a computer or a digital signal processor.

  According to the present invention, when a technique for delaying one channel with respect to the other channel is applied to a communication technique using two channels such as W-CDMA, the transmission is suitable for improving communication performance. It is possible to provide a device, a receiving device, a transmitting method, a receiving method, and a program for realizing these on a computer or a digital signal processor.

  Embodiments of the present invention will be described below. In addition, embodiment described below is for description and does not limit the scope of the present invention. Therefore, those skilled in the art can employ embodiments in which each or all of these elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

  In the following, the case where the principle of the present invention is applied mainly to W-CDMA will be described. However, the scope of the present invention is not necessarily limited to this, and the present invention is also applicable to various applications using two channels. Applicable.

  In the following, first, a basic technique of W-CDMA corresponding to the conventional technique will be described, and thereafter, a difference between the present embodiment and the conventional technique will be described.

(Basic W-CDMA technology)
FIG. 1 is an explanatory diagram showing a schematic configuration of a conventional W-CDMA communication system. Hereinafter, a description will be given with reference to FIG.

  The communication system 101 includes a transmission device 131 and a reception device 151. When an uplink is assumed, the transmission device 131 corresponds to a mobile phone, and the reception device 151 corresponds to a base station.

  In transmission apparatus 131, primary spreading section 133 sequentially provides spreading codes C [i] and C [j] to the data channel signal (DPDCH) and the control channel signal (DPCCH), Each is spreading.

  The spreading codes C [i] and C [j] are OVSF codes, and as described above, the I channel side on which the data channel (DPDCH) signal 132 is processed is No. 16 (i = 16), Q channel No. 0 (j = 0) is used on the side.

  Since each cycle of the spreading codes C [i] and C [j] is 64, in principle, any bit value of -1 or 1 is used as the head of the spreading codes C [i] and C [j]. Are spread out in a cyclic manner by sequentially taking them out in synchronization and multiplying them one by one.

  After primary spreading and before secondary spreading and modulation, preprocessing section 134 superimposes spreading code β on the good channel. This spreading code β is called a gain factor in the W-CDMA standard, and is provided for adjustment to suppress interference in the transmission power ratio between DPDCH and DPCCH.

  Further, the HPSK modulator 135 receives the I-channel scramble code S [1] and the Q-channel scramble code S [2], and performs HPSK (Hybrid Phase Shift Keying) spreading / modulation while applying them. As the scramble code, a long-period spreading code using a Gold code is used.

  The resulting I channel and Q channel signals are transmitted by the RF transmitter 136 and sent to the receiver 151.

  In the receiver 151, the RF receiver 152 receives the transmitted signal and divides it into an I channel and a Q channel.

  Then, the HPSK demodulator 153 receives the I-channel scramble code S [1] and the Q-channel scramble code S [2], and performs HPSK despreading / demodulation while applying them.

  Further, the despreading unit 154 performs despreading using the spreading codes C [i] and C [j]. In principle, -1 and 1 bits are sequentially extracted from the heads of the spreading codes C [i] and C [j] while being cyclically synchronized, and multiplied by one symbol to perform despreading. Do.

  In this way, a data channel signal (DPDCH) and a control channel signal (DPCCH) are obtained.

(Communication system of this embodiment)
FIG. 2 is a schematic diagram illustrating a schematic configuration of a communication system according to an embodiment to which the technology disclosed in [Patent Document 1] is applied. Hereinafter, a description will be given with reference to FIG.

  The difference between the communication system 101 shown in this figure and that shown in FIG. 1 is that a delay circuit 231 is provided on the I channel side in the transmission device 131 and a delay circuit 251 is provided on the Q channel side in the reception device 151. It is a point provided. Here, the delay times of the delay circuit 231 and the delay circuit 251 are equal.

  In the following, what value is desirable as the delay time will be described with reference to an example in which the effect of the related art and the present embodiment is measured by computer simulation based on the Monte Carlo method and obtained through experiments.

  FIG. 3 is an explanatory diagram showing an OVSF code pattern when SF = 64. Hereinafter, a description will be given with reference to FIG.

  In this figure, white means 1 and black means -1. One line corresponds to one round of code (64 chips), and corresponds to OVSF codes of No. 0, No. 1,.

  The OVSF code of number 0 is applied to the Q channel side, and various OVSF codes are applied to the I channel side, and the delay time is 0.5 chip (0.5 times the time length of one chip). The simulation was performed by giving time. The data rate was 60 Kbps, the number of users was 30, and the bit error rate was measured without considering the influence of noise (the same applies hereinafter).

  FIG. 4 is a graph showing bit error rates obtained as a result of performing simulations on various OVSF codes with a 0.5 chip delay according to the prior art and this embodiment. Hereinafter, a description will be given with reference to FIG.

  As can be seen from this figure, in the conventional technique, there is almost no change in the bit error rate depending on what number is selected with the OVSF code, but in this embodiment, the bit error depends on what number is selected with the OVSF code. The rate varies greatly.

  The lowest bit error rate is the 32nd OVSF code (a code in which -1 and 1 are flipped for each chip), and the 32nd to 63rd OVSF codes are a bit higher than the other codes. The error rate is low.

  FIG. 5 is a graph obtained by measuring the bit error rate when the delay time is changed from 0 chip to 1 chip for the OVSF codes No. 8, No. 16, No. 32, and No. 40 in the present embodiment. Hereinafter, a description will be given with reference to FIG.

  As shown in the figure, the range in which the bit error rate is good is a delay time of about 0.3 chip to 0.7 chip. However, from the viewpoint of mounting digital signal processing, it is considered that mounting is easy when the delay time is 0.5 chip (0.5 chip time length). Therefore, the following description will be made mainly assuming the case where the delay time is 0.5 chip.

  In general, the chip time length matches the symbol time length. That is, typically one symbol can be processed per channel in one chip time.

  In this manner, in the transmission device 131 of the present embodiment, the spreading unit 133 functions to output a synchronized signal, so the output line of the spreading unit 133 functions as an input receiving unit, and an I-channel delay circuit 231 functions as a delay unit, the HPSK modulation unit 135 functions as a modulation unit, and the RF transmission unit 136 functions as a transmission unit.

  In the receiving apparatus 151 of the present embodiment, the RF receiving unit 152 functions as a receiving unit, the HPSK demodulating unit 153 functions as a demodulating unit, the delay unit 251 functions as a synchronizing unit, and the despreading unit 154 A signal synchronized with the I channel and the Q channel is given.

  FIG. 6 is a schematic diagram showing a schematic configuration of an embodiment in which the arrangement of the delay circuit is changed in the receiving device. Hereinafter, a description will be given with reference to FIG.

  In FIG. 2, delay circuit 251 of receiving apparatus 151 is arranged between Q channel HPSK demodulator 153 and despreader 154.

  On the other hand, in the embodiment shown in the figure, the delay circuit 251 converts the spreading code C [i] given to the I channel despreading unit 154 to the spreading code C [j] given to the Q channel despreading unit 154. On the other hand, it is arranged so as to be delayed by 0.5 chip. As a result, the two signals can be synchronized.

  That is, in the receiving apparatus 151 of the present embodiment, the delay unit 251 and the despreading unit 154 work together to function as a synchronization unit, and output synchronized signals of DPDCH and DPCCH.

  According to the above embodiment, when applying a technique for delaying one channel with respect to the other channel to a communication technique using two channels such as W-CDMA, the delay time is set to 0.3 chip. The bit error rate can be reduced by setting the length to 0.7-chip length. In addition, by setting the length to 0.5 chip (0.5 chip time length), it is possible to facilitate mounting and suppress the manufacturing cost.

  In the following, an embodiment will be described in which an LSF filter is applied to the present embodiment to further improve performance.

(LSF filter)
FIG. 7 is an explanatory diagram showing a schematic configuration of an LSF filter having two tap stages. Hereinafter, a description will be given with reference to FIG.

The LSF filter 701 is a kind of FIR filter and can control the autocorrelation characteristic of the spread code. In order to obtain a delay signal of 1 chip, 2 chips, 3 chips,. -r) times, (-r) ² times, and so on, and the adder circuit 704 calculates and outputs the sum.

In general, the optimum value of the autocorrelation coefficient is r = 2-3 ^1/2 or r =-(2-3 ^1/2 ). Further, the number of tap stages is sufficiently effective if it is about two stages.

In W-CDMA, the following three places can be considered as places where the LSF filter is applied.
(1) In the transmitter 131, the LSF filter is applied to the scramble codes S [1] and S [2], and then applied to the HPSK modulator 135 (hereinafter abbreviated as ue).
(2) The receiving apparatus 151 applies the LSF filter to the scramble codes S [1] and S [2], and then gives the code to the HPSK demodulator 153 (hereinafter abbreviated as bs).
(3) In the receiving apparatus 151, the I channel and Q channel signals obtained from the RF receiving unit 152 are subjected to an LSF filter and then applied to the HPSK demodulating unit 153 (hereinafter abbreviated as air).

  FIG. 8 is an explanatory diagram illustrating a schematic configuration of a transmission device according to the technique ue. FIG. 9 is an explanatory diagram showing a schematic configuration in which the technique bs is applied to the receiving apparatus shown in FIG. FIG. 10 is an explanatory diagram showing a schematic configuration of a receiving device using the technique air in the receiving device shown in FIG. Hereinafter, description will be given with reference to these drawings.

As shown in these drawings, in the methods ue and bs, the following two codes are given to the HPSK modulation unit 135 and the HPSK demodulation unit 153 as scramble code inputs.
(A) S [1] to which an LSF filter 701 is applied;
(B) The scramble code S [2] is thinned out by the 2 decimate circuit 801, and the code W [1] (W ₁ in the figure) and S [ 1] multiplied by the superimposing circuit 802, the LSF filter 701 applied,

  On the other hand, in the method air, an LSF filter 701 is arranged for each of the I channel and the Q channel between the RF receiver 152 and the HPSK demodulator 153.

Since these methods can be used in appropriate combination in one communication system, there are 2 ³ = 8 methods depending on which pattern is used. In the following, a description will be given of what combinations are preferable along with the simulation results.

  FIG. 11 is a graph showing results when the LSF filter is applied in various combinations in the configuration shown in FIG. Hereinafter, a description will be given with reference to FIG.

  From the results shown in this figure, it can be seen that the effect of applying the LSF filter depends on which of the OVSF codes is selected. The best way to apply the LSF filter in the default setting of the current W-CDMA standard by averaging the dependence of the OVSF code is when only air is applied.

  When either OVSF code is selected, the bit error rate of the mode in which ue and bs are simultaneously applied with the 0th code and the mode in which air and bs are simultaneously applied with the 0th code are low.

  FIG. 12 is a graph showing results when the correlation parameter r is changed when the LSF filter is applied in various combinations in the configurations shown in FIG. 1 (prior art) and FIGS. 2 and 6 (present technology). . Hereinafter, a description will be given with reference to FIG.

  This figure (A) is code 0 (channel synchronization: code 0) for the conventional technique + LSF, (B) is code 32 (channel synchronization: code 32) for the conventional technique + LSF, and (C) is The results are obtained when code 32 (channel asynchronous: code 32) is selected for the present technology + LSF, respectively. As can be seen from this figure, the autocorrelation characteristics are greatly changed.

In the code 32 of the prior art + LSF, ue and bs are applied at the same time. The optimum correlation parameter value -0.26795 in this case is positive or negative with the normal optimum correlation parameter value 2-3 ^1/2. The bit error rate is about the same as the minimum value of the result in FIG.

  As shown in this figure (C), in the case of the combination of the present technology + LSF code No. 32, when the value of the correlation parameter (upward arrow in the figure) is selected by applying air and ue simultaneously and inverting the sign of positive and negative. However, the bit error rate is the lowest.

  Next, performance comparison of communication capacity with the current W-CDMA standard will be made for the various combinations described above.

FIG. 13 is a graph showing the bit error rate when the number of users (Ue) is increased for the combination having good performance obtained from FIG. FIG. 14 is a table showing a rate of improvement in communication capacity from the current W-CDMA in the vicinity of a bit error rate of 10 ⁻³ .

  FIG. 13A / FIG. 14A shows the case of the combination of the prior art + LSF + code 0/16/32 in FIGS. 12A and 12B (channel synchronization).

  FIGS. 13B and 14B show the case of the combination of the present technology + LSF + number 32 in FIG. 12C (channel asynchronous).

  As is clear from these figures (in FIGS. 13A and 13B, the scale of the horizontal axis is different), as in the present invention, communication is achieved by providing a relative delay in the channel. It can be seen that the capacity has greatly improved.

  According to the present invention, when a technique for delaying one channel with respect to the other channel is applied to a communication technique using two channels such as W-CDMA, the transmission is suitable for improving communication performance. It is possible to provide a device, a receiving device, a transmitting method, a receiving method, and a program for realizing these on a computer or a digital signal processor.

It is explanatory drawing which shows schematic structure of the communication system of W-CDMA based on a prior art. It is a mimetic diagram showing the outline composition of the communications system concerning this embodiment. It is explanatory drawing which shows the pattern of the OVSF code in the case of SF = 64. 6 is a graph showing bit error rates obtained as a result of performing simulations on various OVSF codes with a 0.5 chip delay according to the related art and the present embodiment. Hereinafter, a description will be given with reference to FIG. In this embodiment, it is the graph which measured the bit error rate when changing delay time from 0 chip to 1 chip with respect to OVSF code No. 8, No. 16, No. 32 and No. 40. It is a schematic diagram which shows the outline | summary structure of embodiment which changed arrangement | positioning of the delay circuit in the receiver. It is explanatory drawing which shows schematic structure of the LSF filter of 2 tap stages. It is explanatory drawing which shows schematic structure of the transmitter by the technique ue. FIG. 3 is an explanatory diagram illustrating a schematic configuration in which a technique bs is applied to the receiving apparatus illustrated in FIG. 2. It is explanatory drawing which shows the schematic structure of the receiver by technique air to the receiver shown in FIG. 2 is a graph showing the results when the LSF filter is applied in various combinations in the configuration shown in FIG. 1. FIG. 7 is a graph showing the results when the correlation parameter r is changed when the LSF filter is applied in various combinations in the configurations shown in FIG. 1 (prior art) and FIGS. 2 and 6 (present technology). 13 is a graph showing a bit error rate when the number of users (Ue) is increased for the combination having good performance obtained from FIG. 12. It is a table | surface which shows the ratio which the communication capacity improved from the present W-CDMA in the bit error rate ^10-3 vicinity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Communication system 131 Transmission apparatus 133 Spreading part 134 Preprocessing part 135 HPSK modulation part 136 RF transmission part 151 Reception apparatus 152 RF reception part 153 HPSK demodulation part 154 Despreading part 231 Delay circuit 251 Delay circuit 701 LSF filter 702 Delay circuit 703 Multiplication Circuit 704 addition circuit 801 2 decimate circuit 802 superposition circuit

Claims (18)

An input receiving unit that receives input of two synchronized signals synchronized with each other in units of chip time length;
A delay unit that outputs two asynchronous signals obtained by delaying one of the two synchronized signals that have received the input with respect to the other by a predetermined delay time;
A modulation unit that outputs two modulated signals obtained by modulating each of the output two asynchronous signals;
A transmitter that transmits the two modulated signals that have been output;
The transmission apparatus according to claim 1, wherein the predetermined delay time length is 0.3 to 0.7 times the chip time length. The transmission device according to claim 1,
The two synchronized signals are an I channel signal and a Q channel signal after spreading by an OVSF code in W-CDMA communication and before spreading by a scramble code using a Gold code. The transmission device according to claim 2,
As the predetermined delay time length, 0.5 times the chip time length is used,
As the OVSF code, the 32nd to 63rd OVSF codes of length 64 are used for the I channel,
A transmitter characterized in that the scramble code is obtained by applying an LSF filter having an autocorrelation coefficient ± (2-3 ^1/2 ) to one or more tap stages to the Gold code. A receiving unit for receiving two received signals;
A demodulator that outputs two demodulated signals obtained by demodulating each of the two received signals;
A synchronization unit for outputting two synchronized signals obtained by synchronizing the output two demodulated signals with each other in a chip time length unit;
The predetermined delay time length is 0.3 to 0.7 times the chip time length. The receiving device according to claim 4,
The two demodulated signals are an I channel signal and a Q channel signal after despreading by a scramble code using a Gold code in W-CDMA communication and before despreading by an OVSF code. The receiving device according to claim 5,
As the predetermined delay time length, 0.5 times the chip time length is used,
As the OVSF code, the 32nd to 63rd OVSF codes of length 64 are used for the I channel,
A receiving apparatus characterized in that a scramble code is obtained by applying an LSF filter having an autocorrelation coefficient ± (2-3 ^1/2 ) to one or more tap stages to the Gold code. The receiving device according to claim 5,
As the predetermined delay time length, 0.5 times the chip time length is used,
As the OVSF code, numbers 32 to 63 are used.
A receiving apparatus, wherein an LSF filter having an autocorrelation coefficient ± (2-3 ^1/2 ) is applied to the received signal between the receiving unit and the demodulating unit with one or more tap stages. The receiving device according to any one of claims 5 to 7,
The OVSF code that despreads one of the demodulated signals is delayed by the predetermined time length compared to the OVSF code that despreads the other, and is synchronized with each other in units of chip time lengths. apparatus. An input receiving step for receiving input of two synchronized signals synchronized with each other in units of chip time length;
A delaying step for outputting two asynchronous signals obtained by delaying one of the two synchronized signals that have received the input with respect to the other by a predetermined delay time;
A modulation step of outputting two modulated signals obtained by modulating each of the output two asynchronous signals;
A transmission step of transmitting the output two modulated signals,
The transmission method characterized in that the predetermined delay time length is 0.3 to 0.7 times the chip time length. The transmission method according to claim 9, comprising:
The two synchronized signals are an I channel signal and a Q channel signal after spreading by an OVSF code in W-CDMA communication and before spreading by a scramble code using a Gold code. The transmission method according to claim 10, comprising:
As the predetermined delay time length, 0.5 times the chip time length is used,
As the OVSF code, numbers 32 to 63 are used.
A transmission method characterized in that a scramble code is obtained by applying an LSF filter having an autocorrelation coefficient ± (2-3 ^1/2 ) to one or more tap stages to the Gold code. A receiving process for receiving two received signals;
A demodulation step of outputting two demodulated signals obtained by demodulating each of the two received signals;
A synchronization step of delaying one of the output two demodulated signals with respect to the other by a predetermined delay time length, and outputting two synchronized signals synchronized with each other in units of chip time lengths,
The predetermined delay time length is 0.3 to 0.7 times the chip time length. The reception method according to claim 12, comprising:
The two demodulated signals are an I channel signal and a Q channel signal after despreading by a scramble code using a Gold code in W-CDMA communication and before despreading by an OVSF code. The reception method according to claim 13, comprising:
As the predetermined delay time length, 0.5 times the chip time length is used,
As the OVSF code, numbers 32 to 63 are used.
A receiving method, characterized in that the Gold code is obtained by applying an LSF filter having one or more tap stages and an autocorrelation coefficient ± (2-3 ^1/2 ) to the scramble code. The reception method according to claim 13, comprising:
As the predetermined delay time length, 0.5 times the chip time length is used,
As the OVSF code, numbers 32 to 63 are used.
A receiving method, wherein an LSF filter having an autocorrelation coefficient ± (2-3 ^1/2 ) is applied to the received signal between the receiving unit and the demodulating unit with one or more tap stages. The reception method according to any one of claims 13 to 15,
A receiving method comprising: delaying an OVSF code for despreading one of the demodulated signals by the predetermined time length to synchronize with each other in units of chip time lengths.   A program that causes a computer or a digital signal processor to function as each unit of the transmission device according to any one of claims 1 to 3.   A program that causes a computer or a digital signal processor to function as each unit of the receiving device according to any one of claims 4 to 8.

Images