DESCRIPTION OF THE PREFERRED EMBODYMENT

[0036] If following embodiment may be referred, the present invention will be understood much more clearly.

EXAMPLE-1

[0037] FIG. 1 is a functional block diagram for radio terminal used to a radio transmission system as example-1 and a radio terminal 1 have a communication terminal 1 , a functional means 2 , antenna 3 , and a selective information specified means 5 .

[0038] Accordingly, the communication functional means 2 is an unit to have the common modulation and demodulation function part 2 a assembling common functional part a common function for each communication mode (for example, an orthogonal phase modulator, an automatic gain control part for receiving a signal, quasi-synchronized detecting part and the like) and the reconfiguable modulation and demodulation function part 2 b comprising a function (for example, a shape of a Filter, a format for transferring a signal and the like) possible not to be common.

[0039] The communication functional means 2 is set so as to a specific communication system by means of activating only a functional realizing means within the reconfigurable modulation and demodulation part 2 b , in which the functional selecting means 4 is selected on the basis of a selective information specified by the specified means of differential information.

[0040] In other words, for the radio communication systems configured by reconfigurable modulation and demodulation part 2 b.

[0041] We must prepare the differential information in advance and by specifying the differential information the radio terminal 1 becomes the specified terminal.

[0042] Accordingly, it is unnecessary to have many kinds of terminals depending to a prior service system for a portable telephone service, and any portable telephone services for any companies can be performed by means of one terminal.

[0043] Further, a differential information to select a function which activate the reconfigurable part 2 b is a coefficient information writing a differential part between each kind of radio modulation and demodulation scheme, and their address allocated on the DSPH.

[0044] If a reconfigurable circuit possible to change the communication scheme only by means of these numerical value is made out beforehand within a digital signal processing hardware(DPSH), even in the case of changing a system with a communication mode such as an information transmission rate and the like thereafter, replacement for a system can be performed flexibly.

EXAMPLE-2

[0045] In the example-1, a basic system was described.

[0046] FIG. 2 is an approximate configuration for a radio transmission system to transmit a differential information from a base station to a mobile station.

[0047] In this example-2, a differential information, that is a selective information, from a radio base station is transmitted with the use of a radio broadcasting type, then mobile stations receiving the differential information establish modulation and demodulation scheme which the base station adopted.

[0048] Finally, the both stations start to communicate each other.

[0049] As a differential information to transmit with the use of this radio broadcasting, only an coefficient information such as tap coefficient for a filter, a coefficient to determine a shape of a filter, a coefficient to determine a tap coefficient for the sake of an equalization, (in the case of carrying out Fourier transformation at a receiving side) a coefficient to determine a length of FFT code sequence information (for CDMA) and the like is illustrated.

[0050] A capacity for these informations is quite small in comparison with the case of full download of all the DSPH programs.

[0051] First, when an user having a radio terminal enter into a cell, in which a communication is carried out by some communication systems, the user receives differential information to determine some modulation and demodulation method which is a petty information volume with the use of a control channel.

[0052] This parameter is radiated in the state of a radio broadcasting from a base station. Moreover, as information volume is not so large, an error corrected data transmission scheme having much redundancy bit is used. Thereafter, it is prefer to be able to transmit in the state of a free error with the use of an easy modulation a demodulation method.

[0053] For example, simple phase modulation of two values (Binary Phase Shift Keying: BPSK) and the like are enough.

[0054] Moreover, in the case of receiving a differential information at a radio terminal, it is also necessary to establish anyone of synchronization between a radio base station.

[0055] Next, if synchronization is attained once, a differential information is received at a terminal, the terminal becomes to be a transmitter and a receiver corresponding to aforesaid communication on the basis of its information.

[0056] Further, replacement for a system comprising only a differential information is carried our rapidly. Moreover, as a receiving information for replacement is finished in the state of small volume, eve in the case of transmitting a parameter information under inferior circumstance, the number for retransmission is finished in the state of small volume. Therefore the replacement becomes to be carried out anytime and anywhere.

[0057] Detail of a radio terminal to become a mobile station is as shown in FIG. 3 .

[0058] This comprises two units roughly as described below.

[0059] One unit is RF unit for treating a part having high frequency more than a intermediate frequency (IF) baud and another unit is base band unit for modulating demodulation by means of a digital signal processing having much low frequency.

[0060] RF unit and base band unit are divided each into two module even within its inside, and as the result, one is TX module functioning at a communication part and another is RX module functioning at a receiving part, respectively.

[0061] In TX module in RF unit, an orthogonal phase modulation is carried out by means of converting a transmitted signal as a digital signal from TX module of base band unit to an analogue signal (Digital Analogue converter: D/A) on the IF ban.

[0062] Moreover, after control for output power has been carried out, the analogue data of IF band is carried out from a transmitting antenna by means of converting a transmitting signal having a high frequency of RF band.

[0063] Further, RX module in RF unit, after an analogue radio high frequency signal received has been converted to low frequency to treat easily, gain control is carried out by means of a part of automatic gain control (AGC) as to become the level of digital processing easily.

[0064] And as the result, its signal is detected in the state of wave with the use of a rough orthogonal signal. This is said as “Quasi-synchronized Orthogonal Detector”.

[0065] Thereafter, separated signals as two orthogonal components of Ich and Qch are sent out to base band unit by means of converting a digital signal with the use of “Analogue to Digital Converter: A/D. In this case, in order to carry out a digital signal processing much strictly, it is prefer for sampling speed of this A/D converter to be sampling speed more times faster than a speed for an information signal and to adopt many sample data.

[0066] At one side, in TX module in base band unit, transmitting data frame format (Frame construction circuit), a filter for limiting transmitted band area, and modulation scheme, are decided on the basis of a differential information input from outside, and as the result, a transmitted signal processed in the digital state is transmitted for RF unit.

[0067] On the other hand, in RX module of base band unit, after a synchronizing timing needed to receiving a signal on the basis of a differential information input from outside, a filter form for limiting a band area at a receiving signal side, a method for equalization, and a method for demodulation, are decided, in RX module of RF unit, the transmitted data from a orthogonal signal of receiving signal converted to a digital signal are demodulated.

[0068] Each function determined by abovementioned differential information in base band unit, is reconfigurable function, and the other function in base band and RF unit is common function.

EXAMPLE-4

[0069] FIG. 4 is a functional block diagram in a radio transmitting system referring to example-3 so as to store a differential information at a terminal side.

[0070] In the present example, a differential information referring to modulation and demodulation scheme for the use of communication apparatuses of each company is stored in the form of database at a radio terminal side. Moreover, the present example is multi-mode mobile communication system, in which a user can utilize systems for a plurality of companies only with the use of a switch attached to a portable telephone, of driving type with a user.

[0071] In the difference between the present example and abovementioned example-2, database, in which a differential information for the use of communication apparatuses of each company is input, are input beforehand. For example, a corresponding differential information for the use of communication apparatuses is input from data base to base-band unit as data and a synchronizing information to constitute a transmitter and a receiver by means of selecting buttons from “A” to “D” with an user, and as the result, the desired modulating demodulation scheme can be attained.

[0072] Moreover, after a communication mode has been established, a communication is carried out by means of the same method as each abovementioned embodiment.

[0073] Further, in the present embodiment, a user can select a communication mode optionally and it has advantage that there is unnecessary to carry out a communication to a radio base station until a communication mode will be established.

EXAMPLE-5

[0074] FIG. 5 is an approximate configuration referring to example-4. In which replacement for a communication mode at a radio base station is performed.

[0075] In the present embodiment, if it is assumed that a plurality of radio base stations (RBS) are controlled concentrically with the use of a control station (CS), when a system at a radio base station has been replaced, the control station(CS) transmits its differential information for each radio base station (RBS) via a wired system such as an optical fiber and the like.

[0076] The control station (CS) has a laser diode for the sake of propagating to a transmission line by means of changing a differential information to an optical signal, and the radio base station (RBS) equips RF unit and a base-band unit together with a photo diode and the like, by which a received photo signal changes an electrical signal.

[0077] The radio base station (RBS), that is, constitutes a transmitter and a receiver on the basis of an up-to-date differential information received from the control station (CS).

[0078] Accordingly, as the radio base station (RBS) cm be made to correspond to various radio communication mode corresponding to a differential information transmitted from the control station (CS), it becomes to be able to construct a system that the radio base station (RBS) is controlled concentrically with the use of the control station(CS).

EXAMPLE-5

[0079] FIG. 6 shows example-5 in the case of using the present invention to a television system of next generation.

[0080] Nowadays, an orthogonal frequency division multiplex transmission (OFDM) is proposed as a digital broadcasting system, having large capacity, of next generation.

[0081] As its reason, it is illustrated that a signal transmitted in a radio communication receives that oily a direct wave from a transmitting side but also delay wave by means of reflection such as a building and the like.

[0082] Moreover, as a transmitting speed for an information signal becomes higher, this delay wave becomes to be interference wave to the other information signal, and the delay waves prevent a smooth communication referring to an information signal.

[0083] Further, an orthogonal frequency division multiple, (OFDM) transmission is one of tie scheme to transmit such a high-speed data under multi-path environment.

[0084] In OFDM, a high speed data is transmitted by mean of dividing into a signal with a low speed, in which there is a little for an influence of a delayed wave. Then a transmission is carried out by means of multiplexing for a frequency division with the use of an Inverse Fast Fourier transformation (IFFT) in order to multiplex their divided signals. In a receiving side, the transmitting OFDM data is demodulated by the multiplex with the use of a Fast Fourier transform (FFT).

[0085] As described above, there is less influence with interference by means of dividing an information signal with a high speed into an information signal with a low speed. However, in a radio broadcasting with a television all over the worlds, although a communication system (modulation and demodulation scheme) has already fixed a detailed specification is different.

[0086] However the difference of the communication system is only the number of a step number with a Inverse Fast Fourier Transform in the transmitter side, a guard time for delayed waves, a method for synchronization in receiving side, the step number for a Fourier Transform in the receiver side and a method for an equalization. A transmitting and receiving system for all radio broadcastings becomes to be able to realize.

[0087] If abovementioned system is changed so as to adopt each radio broadcasting system as a different function part, that is, it is possible for a common television receiver in order to correspond to various radio broadcasting systems.

[0088] Accordingly, functions such as IFFT and FFT are included within a base-band unit and a receiving system with all television and radio broadcasting becomes to be possible, Further, in the present example-4, although a configuration possible to transmit from a television receiver, and become a receiving terminal, is illustrated for the cable television system possible to communicate at two-way, However, for the television set, we used only RX module.

[0089] As described above, according to a radio transmission system referring claim 1 according to the present application, as a common faction part, a reconfigurable function part, and means for selecting a function, were installed, and as a configuration was composed so as to become a radio communication terminal possible to communicate with the use of a radio communication mode corresponding to a selective information, it becomes easy to make the size small and light weight, and it becomes possible to restrain cost for producing in comparison with installing means for a communication function by means of all radio communication mode possible to utilize at a communication terminal.

[0090] Moreover, in order to switch a communication mode, as a selective information supplying to a functional selection means, is a simple information only to select a function, it is possible also to transmit With the use of a radio from a base station and it is easy also to storage beforehand at a terminal side.

[0091] Further, as a radio transfer system referring to claim 4 according to the present application, if a common functional part, a reconfigurable functional part, and a functional selection means are installed at a radio base station, it becomes to be possible to realize multimode at a radio base station to change.