JP3763972B2 - Wireless communication method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to wireless communication. In particular, it relates to performing further high-speed transmission and multiplexing using existing equipment in mobile communications.
[0002]
[Prior art]
Today, various services using wireless communication are rapidly spreading.
[0003]
There is a need for a wireless communication facility that can accommodate increasing network traffic and increasing users of wireless communication. In addition, there is a need for a wireless communication facility that can flexibly accommodate non-telephone traffic such as data transmission.
[0004]
To cope with rapidly increasing traffic, radio channel access with higher frequency utilization efficiency is required. For example, the frequency utilization efficiency is increased by high efficiency modulation. Also, in order to flexibly accommodate non-telephone traffic, radio channel access capable of higher speed transmission is required. For example, a multi-rate transmission method in the CDMA system.
[0005]
Changing the design and construction of a wireless line and its equipment to a modulation method different from the design and a higher transmission speed means designing a wireless communication system such as required Eb / No, required CIR, same frequency repetition distance, transmission loss, etc. Resulting in parameter changes, not easy.
[0006]
For example, the following method can be considered when performing high-speed transmission using existing wireless communication equipment.
[0007]
(1) Use high efficiency modulation.
[0008]
(2) The transmission band is expanded while keeping the modulation used.
[0009]
However,
For (1), the required Eb / No and required CIR are changed, and the existing equipment and design cannot be applied immediately. Moreover, the frequency utilization efficiency can be increased as compared with the existing method.
[0010]
For (2), the existing wireless line design can be applied, but the equipment needs to be improved by changing the transmission bandwidth. In addition, the frequency utilization efficiency is lower than that of the existing method.
[0011]
As in this example, there is a need for a wireless communication method that can use the existing wireless communication line design and wireless communication equipment as much as possible without reducing the frequency utilization efficiency of the existing method.
[0012]
[Problems to be solved by the invention]
The conventional wireless communication line design method does not assume that the wireless communication method such as the modulation method is changed after the installation of the wireless equipment. Moreover, from the viewpoint of constructing an economical wireless communication system, the current wireless communication facilities are optimized for the wireless communication system to be used. The frequency utilization efficiency is also desired to be equal to or higher than that of the existing method. From the above viewpoint, the method using the high efficiency modulation is easier to apply to the existing method than the method of expanding the transmission band. The problem to be solved by the present invention is to provide a wireless communication method that is flexible with respect to conventional wireless line design and wireless communication equipment without lowering frequency utilization efficiency even when such high efficiency modulation is used. It is to provide.
[0013]
[Means for Solving the Problems]
The present invention solves the above problem by increasing the number of radio channels in accordance with the transmission output control of the transmitting station. That is, in order to solve the above problems, the present invention solves the following.
[0014]
According to the first aspect of the present invention, there is provided a wireless communication method between a transmitting station that performs transmission output control using a line constituted by a carrier wave with a receiving station and the receiving station, and When it is determined that Eb / NO and CIR are values in the required range, N (N is a natural number of 1 or more) additional carriers, and the frequency intervals between the already used carriers are correlated. A carrier wave that is equal to or greater than the bandwidth is set, frequency diversity reception is performed at the receiving station using the already used carrier wave and N carrier waves, and a plurality of carrier waves used by the transmitting station are transmitted in different time zones. It is characterized by that.
[0015]
The invention according to claim 2 is characterized in that, in the wireless communication method according to claim 1, a carrier wave is set when it is further determined that the transmission is performed with a predetermined transmission output.
[0016]
The invention according to claim 3 is characterized in that, in the wireless communication method according to claim 1, a carrier wave is set when it is further determined that the bit error rate has deteriorated from a predetermined code error rate.
[0017]
According to a fourth aspect of the present invention, in the wireless communication method according to the first, second, or third aspect, the frequency interval between the already used carrier and the N carriers is set near the correlation bandwidth. Features.
[0018]
According to a fifth aspect of the present invention, wireless communication is performed in a wireless communication method between a receiving station and a receiving station that performs transmission output control using a line constituted by time slots with the receiving station. When it is determined that the Eb / NO and CIR of the signal are within the required range, N additional time slots (N is a natural number equal to or greater than 1), and the interval with the already used time slot Sets a time slot that is set to about ½ of the maximum Doppler frequency, and performs time diversity reception at the receiving station using the already used time slot and N time slots, and transmits A plurality of time slots used by a station are used in different time zones.
[0019]
According to a sixth aspect of the present invention, in the wireless communication method according to the fifth aspect, when it is further determined that the transmission is performed with a predetermined transmission output, a time slot is set.
[0020]
The invention according to claim 7 is characterized in that, in the radio communication method according to claim 5, when it is further determined that the bit error rate has deteriorated from a predetermined code error rate, a time slot is set.
[0022]
According to the eighth aspect of the present invention, when it is determined that a preset transmission output has been reached in the wireless communication method between the receiving station and the receiving station that performs transmission output control with the receiving station, Set the number of N antennas (N is a natural number of 1 or more) at the station, and set the interval between the already used receiving station antennas and the N antennas to about 1/2 of the wavelength of the carrier frequency, Spatial diversity reception is performed at a receiving station using the antenna and the N antennas.
[0023]
The invention according to claim 9 is the radio communication method according to any one of claims 1 to 8, wherein 16-value quadrature amplitude modulation is used as a modulation method, and when a preset condition is reached, two-space diversity reception and Or two-branch reception for performing spatial diversity reception and two-frequency diversity reception.
[0027]
In the present invention, high-efficiency modulation such as quadrature amplitude modulation (QAM), phase shift keying (PSK), frequency shift keying (FSK), and coded modulation (Coded Modulation). Is applicable.
[0030]
As described above, the present invention has been limited by adaptively combining transmission diversity by a transmitting station and diversity reception by a receiving station in the case of not satisfying the required Eb / No and the required CIR and at the maximum transmission output. It is possible to apply as much as possible the existing wireless communication line design and the service area and line quality set by the wireless communication equipment in the transmission output. As a result, it is possible to provide a wireless device and a wireless communication method that are economically excellent and scalable.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0032]
(Embodiment 1)
In the first embodiment, N (N is a natural number of 1 or more) carriers are newly set when it is determined that the transmitting station that performs transmission output control with the receiving station has reached a certain transmission output. To do. The frequency interval of the newly set carrier is set to be equal to or greater than the correlation bandwidth. Thereby, each carrier wave to be used becomes almost uncorrelated. In general, the carrier number or frequency newly set in the transmitting station is transmitted to the receiving station through the common control channel. Therefore, in this embodiment as an example, the receiving station receives the information by the information notified through the common control channel. The station sets up a new carrier to receive. The receiving station performs frequency diversity reception using the carrier already used and the newly set carrier. Thus, by dynamically increasing the transmission branch, the line quality can be maintained constant without increasing the transmission output for each carrier wave.
[0033]
Embodiment 1 will be described in detail with reference to FIGS.
[0034]
FIG. 1 is a graph showing the relationship between the transmission output and the distance between radio stations. FIG. 2 is a diagram illustrating the arrangement of carriers in wireless communication according to the present embodiment, and FIG. 3 is a diagram illustrating the relationship of service areas between the transmitting station (base station) 10 and the receiving station (mobile station) 20. is there. In the graph of FIG. 1, the vertical axis indicates the transmission output, and the horizontal axis indicates the distance between the radio stations. The transmission loss increases as the distance between the radio stations increases. In the first embodiment shown in FIG. 1 to FIG. 3, the modulation method is 16QAM.
[0035]
In FIG. 3, the transmitting station 10 and the receiving station 20 communicate using an existing carrier wave when the receiving station 20 is in the one-branch reception area. At this time, for example, when the distance between the transmission station 10 and the reception station 20 is increased until the transmission output reaches the maximum transmission output by the transmission output control from the reception station 20, for example, the transmission power is increased and communication is performed. ing. This is illustrated in FIG. FIG. 1 shows how the transmission output from the transmission station 10 increases as the distance between the transmission station 10 and the reception station 20 increases in order to maintain line quality. When the transmission output from the transmission station 10 reaches the maximum output, the transmission station 10 adds the additional carrier separated by the correlation bandwidth or more to the existing carrier and transmits it as two branches, as shown in FIG. The receiving station 20 performs diversity reception. Since the number of carriers for diversity is increased, the transmission power required for each carrier to maintain the line quality is reduced. For this reason, when the transmitting station 10 performs 2-branch transmission, the transmission output of each transmission carrier decreases as shown in FIG. 1 due to transmission output control from the receiving station 20. This means that the receiving station 20 is in the 2-branch reception area shown in FIG. When the receiving station 20 moves in the direction of further increasing the distance from the transmitting station 10, the transmitting station 10 increases further additional carriers separated by more than the additional correlation bandwidth as shown in FIG. 1, and transmits using three carriers. To do. The receiving station 20 performs diversity reception using these three carriers. Also at this time, the transmission power required to maintain the line quality is reduced. The receiving station 20 is in the 3-branch reception area in FIG.
[0036]
In this way, the number of diversity branches is selected so that it is always below the maximum transmission output that is limited. The additional carriers constituting each branch are separated by more than the bandwidth as shown in FIG. FIG. 3 shows a service area for wireless communication. The area for receiving one branch is closest to the transmitting station, and the distance between the transmitting station and the receiving station increases as the number of branches increases. In FIG. 1 to FIG. 3, a maximum of three branches are received, and a service area equivalent to a conventional service area by QPSK, for example, is secured. At this time, as shown in FIG. 1, it is always the same as the maximum transmission output of the conventional wireless communication method.
[0037]
For this reason, it is not necessary to change parameters of an existing wireless communication line such as an increase in co-channel interference by the wireless communication method according to the present invention. Further, by using high efficiency modulation such as 16QAM, the frequency utilization efficiency can be improved as compared with the existing method.
[0038]
The frequency interval of the carrier wave shown in FIG. 2 can be set near the correlation bandwidth. This is shown in FIG. Thereby, each carrier wave to be used becomes almost uncorrelated.
[0039]
(Embodiment 2)
In the second embodiment, when the transmission output from the transmitting station that performs transmission output control with the receiving station reaches the maximum output, N receiving antennas (N is a natural number of 1 or more) at the receiving station. Is newly set. The interval between the receiving antennas is set to about ½ of the wavelength of the carrier frequency.
[0040]
As a result, each of the plurality of receiving antennas is substantially uncorrelated. Spatial diversity reception is performed at the receiving station using the receiving antenna already used and the newly set receiving antenna.
[0041]
The present embodiment will be specifically described with reference to FIGS. 5 and 6. The modulation method used here is 16QAM. FIG. 5 shows the frequency arrangement in the second embodiment. As can be seen from the frequency arrangement of FIG. 5, only existing carriers are used. FIG. 6 shows a service area for wireless communication. As shown in FIG. 6, the receiving station 20 of this embodiment has a plurality of receiving antennas. The interval between the receiving antennas is set to about ½ of the wavelength of the carrier frequency. As a result, each of the plurality of receiving antennas is substantially uncorrelated. Here, an example in which three receiving antennas are used is shown. In FIG. 6, the receiving station 20 increases the number of receiving antennas to be added according to the distance from the transmitting station 10. In an area close to the transmitting station 10, the receiving station 20 uses one receiving antenna and receives one branch using the transmission output control until the maximum transmission output is obtained. The receiving station 20 performs two-branch spatial diversity using two receiving antennas in the next area. When transmission using two-branch spatial diversity reaches the maximum output, three-branch spatial diversity is performed in an area farther than that. The relationship between the transmission output and the distance between the radio stations in diversity reception (reception using a plurality of branches) at this time is the same as in FIG.
[0042]
As described above, the receiving station 20 of the present embodiment secures a service area equivalent to the conventional QPSK service area, for example, by spatial diversity reception after the transmission output of the transmitting station 10 reaches the maximum.
[0043]
(Embodiment 3)
In the third embodiment, when transmission of a transmitting station that performs transmission output control with a receiving station reaches a certain transmission output, N time slots (N is a natural number of 1 or more) are newly set. Set. The time interval of each time slot is set to about 1/2 of the maximum Doppler frequency. As a result, the intervals between the plurality of time slots are substantially uncorrelated. The receiving station performs time diversity reception using the already used time slot and the newly set time slot. This time diversity maintains the line quality.
[0044]
FIG. 7 shows the positional relationship of time slots in this embodiment. The modulation method at this time is 16QAM. The time position shown in FIG. 7 is the maximum Doppler frequency. Periodic The time interval is set to about 1/2. Since each time slot is independent as shown in FIG. 7, 3-branch reception is possible. Therefore, as in the first or second embodiment, when the transmission output in reception by one branch using an existing time slot is maximized, time diversity of two branches or three branches using an additional time slot is used. The line quality can be maintained by reception. The state of diversity reception at this time is the same as in FIGS.
[0045]
As described above, the present embodiment secures a service area equivalent to that of the conventional QPSK, for example, by time diversity reception.
[0046]
(Embodiment 4)
The fourth embodiment is a combination of the first and second embodiments described above. For this reason, when a certain transmission output is reached, N reception antennas (N is a natural number of 1 or more) set at a distance of about ½ of the carrier frequency are used at the reception station. For this spatial diversity, N (N is a natural number of 1 or more) carrier waves can be newly set. Frequency diversity reception is performed at the receiving station using the carrier already used and the newly set carrier. As a result, the receiving station performs space and frequency diversity reception.
[0047]
Embodiment 4 will be specifically described with reference to FIGS. 8 and 9. FIG. 8 shows the frequency arrangement. Each carrier frequency interval is more than the correlation bandwidth. FIG. 9 shows a service area for wireless communication. The modulation method used here is 16QAM. As shown in FIG. 9, the receiving station 20 uses a plurality of receiving antennas placed at a distance of ½ of the wavelength of the carrier frequency. With this receiving antenna and carrier wave, diversity reception corresponding to a maximum of 9 branches (3 spatial branches × 3 carrier waves) is possible.
[0048]
In this way, a service area equivalent to that of the conventional QPSK is ensured by frequency and space diversity reception.
[0049]
Each of the added carrier frequency intervals described above may be separated only in the vicinity of the correlation bandwidth.
[0050]
(Embodiment 5)
The fifth embodiment is a combination of the third embodiment (time diversity) and the second embodiment (space diversity). Therefore, the receiving station of the third embodiment further uses N receiving antennas (N is a natural number of 1 or more) set to a distance of about ½ of the carrier frequency. As a result, the receiving station performs time and space diversity reception.
[0051]
More specifically, when the maximum output is exceeded from the transmitting station, as shown in the time slot arrangement of FIG. 7, each time slot interval is a time interval that is about 1/2 of the maximum Doppler frequency. Then an additional time slot is sent. As shown in FIG. 6, the receiving station has three receiving antennas set at a distance of about half the wavelength of the carrier frequency. For this reason, in this embodiment, it is possible to perform diversity reception corresponding to a maximum of 9 branches (time diversity 3 × space diversity 3).
[0052]
(Embodiment 6)
In the sixth embodiment, a time element is added to the above-described first embodiment (frequency diversity) to simplify the configuration of the transmitting station.
[0053]
FIG. 10 shows the arrangement of frequencies (FIG. 10 (a)) and time (FIG. 10 (b)) used for transmission and reception in the sixth embodiment. The modulation method is 16QAM. The sixth embodiment is characterized in that a plurality of carrier waves are transmitted at different times. Therefore, the sixth embodiment has the effect of frequency diversity of the first embodiment and the effect that the wireless circuit can be designed more easily by transmitting a plurality of carrier waves at different times. The added carrier interval may be in the vicinity of the correlation bandwidth.
[0054]
(About modulation method to be used)
In the first to sixth embodiments described above, the modulation method used for transmission / reception is 16QAM (16-value orthogonal modulation), but the present invention has the same effect for higher-value QAM.
[0055]
Similarly, the same effect can be obtained when the modulation method used for transmission / reception is PSK (phase shift keying or FSK (frequency shift keying)).
[0056]
Similarly, the same effect can be obtained when the modulation method used for transmission / reception is coded modulation.
[0057]
(Control by error rate)
In the above first to sixth embodiments, diversity reception is controlled by transmission output. However, it can also be controlled by the code error rate of the received signal. FIG. 11 shows the relationship between the code error rate of the received signal and the distance between radio stations. The transmission / reception conditions shown in FIG. 11 are that the transmission output of the radio station is constant and the code error rate is 10 ^-2 It is as follows. At this time, when a preset code error rate is deteriorated, a predetermined error rate or less can be achieved by increasing the number of branches.
[0058]
Such control based on the code error rate of the received signal can be commonly applied to the frequency diversity, space diversity, time diversity, and combinations thereof described above in the first to seventh embodiments.
[0059]
(Configuration example of transceiver when there are multiple carriers)
FIG. 12 shows an example of the configuration of a radio station used in the first embodiment and the like.
[0060]
The radio station shown in FIG. 12 includes two sets of transmission / reception units in the radio unit.
[0061]
Each of the first receiver and the second receiver includes high-frequency amplifiers 112 and 122, reception mixers 114 and 124, intermediate amplifiers 116 and 126, and demodulators 118 and 128, and receives radio channels of different frequencies. Thus, a baseband signal is obtained. The first transmission unit and the second transmission unit include modulators 136 and 146, transmission mixers 134 and 144, and transmission power amplifiers 132 and 142, respectively. The first transmission unit and the second transmission unit transmit transmission signals from the baseband processing unit 150 using radio channels of different frequencies. The frequency synthesizer 103 sends corresponding frequencies to the reception mixers 114 and 124 of the first and second reception units 110 and 120 and the transmission mixers 134 and 144 of the first and second transmission units 130 and 140, respectively. Each reception frequency and transmission frequency are determined.
[0062]
A reception signal from the radio unit and a transmission signal to the radio unit are processed by the reception signal processing circuit 152 and the transmission signal processing circuit 154 of the baseband signal processing unit 150. The signal from the reception signal processing circuit 152 is transmitted to the user of the mobile device by the receiver 170. A signal from the transmitter 180 or the like is processed by the transmission signal processing circuit 154 and sent to the radio unit. The control unit includes a control circuit 160 including a display, a key 190, a CPU, and the like, and controls the baseband signal processing unit 150 and the radio unit.
[0063]
In this way, the transmission / reception can be performed using a plurality of carrier waves (two frequencies in FIG. 12), and diversity reception can be performed by simultaneously receiving the plurality of carrier waves. The above-described radio station is configured to transmit a plurality of carrier waves, but is not necessarily required in a radio station (for example, a mobile station in mobile communication) that does not need to transmit a plurality of carrier waves.
[0064]
(Example of line setting control)
FIG. 13 is a flowchart illustrating specific control on the reception side when switching from diversity reception by 16QAM2 branch to diversity reception by 16QAM4 branch using the above-described fourth embodiment (frequency and space diversity). This process can be realized, for example, using the configuration of the radio station shown in FIG.
[0065]
In the processing of FIG. 13, diversity reception in the fourth embodiment will be specifically described using mobile radio communication in the downlink when the transmission station is a base station and the reception station is a mobile station.
[0066]
In FIG. 13, when a mobile station tries to set up a line, it identifies the area in which it is located (S105), and tries to set up a line using a free line. At this time, Eb / NO and CIR of the line to be set in the mobile station are measured and compared with predetermined Eb / No and CIR (S110). When the quality of the line to be set is sufficiently good, the line is set as it is (S115). In FIG. 12, reception at the mobile station always performs two spatial diversity receptions.
[0067]
When the line quality is not good, transmission output control is performed. For this purpose, a command is transmitted from the mobile station to the base station to increase the transmission output (S120). This is performed until sufficient line quality is obtained (“No” in S135), and once obtained (“Yes” in S135), the line is set (S140).
[0068]
Now, when the mobile station comes to the cell edge, the base station transmits to the mobile station at the maximum transmission power on the downlink (“Yes” in S130). The mobile station searches for an additional available radio channel in order to perform radio communication with the base station at the cell edge (S155).
[0069]
After detecting a free radio channel, the mobile station applies to the base station that is currently talking to use the radio channel detected by the mobile station. When there is no particular problem with the use of the radio channel requested by the mobile station, the base station sets up a radio communication line with the mobile station (S160). The wireless communication line to be set is a wireless channel of a different carrier wave in the first embodiment. Thereby, the mobile station can use the carrier already used and the newly set carrier. The mobile station performs combined reception of the plurality of received radio channels. The combined reception at this time is four-branch diversity because two spatial diversity and two frequency diversity are performed. The quality of this additional line is also checked (S165), and if not sufficient, transmission output control is performed (S175, S180, S185). If transmission output control is performed and the line quality is not sufficient even at the maximum transmission output (“Yes” in S180), the line setting cannot be set (S190).
[0070]
The determination as to whether the transmission power is the maximum transmission power may be made because the line quality is not improved even if a command for increasing the transmission power is transmitted.
[0071]
Thereby, it is possible to prevent a decrease in cell radius due to an increase in required Eb / NO and required CIR due to the use of 16QAM which is high efficiency modulation.
[0072]
In FIG. 12 described above, it is assumed that the line is defined by a carrier wave as described in the fourth embodiment. However, as described in other embodiments, the improvement in reception quality due to diversity may be defined by a time slot, a spreading code, or a combination thereof. Also in this case, the control can be performed similarly to the control shown in FIG. Moreover, quality improvement may be performed not only by diversity due to an increase in the number of lines but also by space diversity by increasing the number of receiving antennas.
[0073]
As described above, according to the wireless communication method of the present invention, when the required Eb / NO and the required CIR cannot be satisfied at the cell edge or the like, a new wireless channel is selected and a new wireless channel is newly selected. It is possible to provide a wireless communication method for performing wireless communication by simultaneously using the wireless channels set in the above.
[0074]
Furthermore, by performing diversity reception at the receiving station using a plurality of radio channels simultaneously, the transmission output of the base station can be reduced, and the required Eb / NO and required CIR at the mobile station can be satisfied.
[0075]
【The invention's effect】
The present invention has the following effects.
[0076]
(1) Wireless communication can be performed over a long distance within a limited transmission power range.
[0077]
(2) Further high speed transmission or high quality transmission can be performed using existing equipment.
[0078]
(3) Wireless communication can be performed with lower power in high-speed transmission.
[0079]
(4) The design parameters of the wireless system such as the current cell equipment can be used.
[0080]
(5) Since the conventional radio communication equipment and line design can be applied, a more economical radio communication system can be constructed.
[0081]
(6) High compatibility with existing wireless communication systems.
[Brief description of the drawings]
FIG. 1 is a graph showing a relationship between a transmission output and a distance between wireless stations.
FIG. 2 is a diagram illustrating the arrangement of carrier waves in wireless communication according to the first embodiment.
FIG. 3 is a diagram illustrating a relationship between a transmitting station (base station) and a receiving station (mobile station).
FIG. 4 is a diagram illustrating another arrangement of carrier waves in wireless communication.
FIG. 5 is a diagram illustrating the arrangement of carrier waves in wireless communication according to the second embodiment.
FIG. 6 is a diagram illustrating a relationship between a transmitting station (base station) and a receiving station (mobile station).
FIG. 7 is a diagram for explaining the arrangement of time slots in wireless communication according to the third embodiment.
FIG. 8 is a diagram illustrating an arrangement of the number of conveyances in wireless communication according to the fourth embodiment.
FIG. 9 is a diagram illustrating a relationship between a transmitting station (base station) and a receiving station (mobile station) according to the fourth embodiment.
FIG. 10 is a diagram illustrating the arrangement of the number of conveyances in wireless communication according to the sixth embodiment.
FIG. 11 is a graph showing a relationship between an error rate of a received signal and a distance between wireless stations.
FIG. 12 is a block diagram illustrating an example of a configuration of a radio station.
FIG. 13 is a flowchart illustrating an example of control.
[Explanation of symbols]
10 Transmitting station
20 Receiving station
103 Frequency synthesizer
110, 120 receiver
112, 122 high frequency amplifier
114,124 receiving mixer
116, 126 Intermediate amplifier
118,128 demodulator
130,140 transmitter
132, 142 Transmission power amplifier
134, 144 Transmission mixer
136, 146 modulator
150 Baseband signal processor
152 Received Signal Processing Circuit
154 Transmission signal processing circuit
160 Control circuit
170 Handset
180 transmitter
190 Display key

Claims (9)

In the wireless communication method between the receiving station and the receiving station that performs transmission output control using a line constituted by a carrier wave with the receiving station,
When it is determined that Eb / NO and CIR of a signal to be wirelessly communicated are values within a desired range , N additional carriers (N is a natural number of 1 or more) that are already in use Carrier waves whose frequency intervals are equal to or greater than the correlation bandwidth ,
Wherein the carrier already used by using the N-number of carriers, have rows frequency diversity reception in the receiving station,
A plurality of carrier waves used by the transmitting station are transmitted in different time zones, respectively . The wireless communication method according to claim 1,
A wireless communication method , wherein the carrier wave is set when it is further determined that the signal is transmitted with a predetermined transmission output. The wireless communication method according to claim 1,
A radio communication method characterized by setting the carrier wave when it is further determined that the bit error rate has deteriorated from a predetermined code error rate. The wireless communication method according to claim 1, 2 or 3,
A radio communication method characterized in that frequency intervals of the already used carrier and the N carriers are set in the vicinity of a correlation bandwidth. In the radio communication method between the receiving station and the receiving station that performs transmission output control using a line constituted by time slots with the receiving station,
When it is determined that Eb / NO and CIR of a signal to be wirelessly communicated are values within a desired range , N additional time slots (N is a natural number equal to or greater than 1) that are already used Set a time slot in which the distance between each slot is set to about 1/2 of the maximum Doppler frequency ,
Wherein a time slot that is already used by using the N time slots, have rows of time diversity reception in the receiving station,
A wireless communication method, wherein a plurality of time slots used by the transmitting station are used in different time zones . The wireless communication method according to claim 5, wherein
A radio communication method characterized in that the time slot is set when it is further determined that the transmission is performed with a predetermined transmission output . The wireless communication method according to claim 5, wherein
A radio communication method characterized in that the time slot is set when it is further determined that the bit error rate has deteriorated from a predetermined code error rate . In the wireless communication method between the transmitting station and the receiving station that performs transmission output control with the receiving station,
When it is judged to have reached the transmission output which is previously set, N pieces in the receiving station (N is a natural number of 1 or more) sets the number of antennas,
The interval between the antenna of the receiving station already used and the N antennas is set to about ½ of the wavelength of the carrier frequency,
Wireless communication method and performing space diversity reception at the receiving station using the said antenna N antennas. The wireless communication method according to any one of claims 1 to 8 ,
Using 16 quadrature amplitude modulation to a modulation method,
A wireless communication method comprising performing two-branch reception for two- space diversity reception or four-branch reception for performing spatial diversity reception and two-frequency diversity reception when a preset condition is reached.

Images