DE10012636B4 - Transmitter and method in a mobile telephone - Google Patents

Abstract

Mobile telephone (1) having a transmitting device (3) provided with combined oscillating circuits (4, 5), of which oscillating circuits a first oscillating circuit (4) a signal at a transit frequency FRF and a second oscillating circuit (5) a signal generated at an intermediate frequency FI, wherein the transit and the intermediate frequency are different from a frequency FTX of a transmission signal, characterized in that it comprises a table with two coefficients U and V, which are to be read for a frequency value F _{i of} the transmission signal, each Coefficient is converted into a signal which is applied to a control input of an oscillation circuit, and in that the two coefficients U and V, when the frequency of the transmission signal from a value F _i to a subsequent value F _{i + 1} passes, of values A + i and B respectively to values A + i + 1 and B, and in that the two coefficients U and V, when the frequency of the transmission signal of a...

Description

The The present invention has a transmitting device and a transmitting method for a Mobile phone according to the generic terms of the claims 1 and 2 to the subject. Such a transmitting device and such Transmission methods are from the article by SHEN FENG u. a. "A bipolar Upconversion Modulation Loop Transmitter for Dual Band Mobile Communications "in IEEE MTT-S Microwave Symposium Digest, Vol. 1, 7.-12. June 1998, pp. 85-88. Its scope is that of mobile telephony, more specifically said mobile phones that comply with the GSM, DCS or PCS standard function. More generally, it finds application in broadcasting systems with frequency jumps. The aim of the invention is a mobile phone from which a transmitting device generated in a frequency range no interference, in which the Phone sends, and at a lower cost.

The Today's mobile phones include a transmitting device. This sending device includes in particular a transmission circuit. A broadcasting circle has the task to generate a transmission signal and a dependent of a reference frequency control make this transmission signal. In general, a transmission circuit comprises in a mobile phone a first, second and third oscillation circuit. It also includes a mixer and a phase comparator. From The three oscillating circuits coming signals are by means of the mixer and the phase comparator connected to a transmission signal on a desired To generate frequency. So this transmission circle causes one of a Referencing frequency dependent Regulation of the signal to be delivered.

Of the Mixer includes two inputs, which are applied to the first and third oscillation circuit. Of the Phase comparator receives at a first input one from the mixer and at a second one Input a signal coming from the second oscillation circuit. An output of this phase comparator goes to the third Oscillator issued from which an output to be delivered Signal corresponds. Such a transmission circuit also allows the production of a Signals that are frequency-hopping-capable is.

Currently you leave for generating a signal that is frequency hopping capable in a frequency domain, For example, the GSM standard frequency range, a frequency of first oscillation circuit in frequency jumps of multiples of 200 go through kHz. A frequency of the second oscillation circuit The coming signal is a fixed frequency in this frequency range. In this way, this frequency jump is found at the output of the third oscillation circuit again, which generates the signal to be output.

A such execution is problematic. The frequency values that a signal to be delivered may have, are known. If a frequency value of the delivered Signals changed should be, lets thus the frequency of the first oscillation circuit is about one Change value, equal to the value of the one to be performed Frequency hopping is. The individual elements of the transmitting circuit are non-linear, being the least linear element of the mixer is. Create these non-linearities noise on harmonic frequencies that connect in the transmitting circuit and generate a signal that interferes with the signal to be output. These disorder impaired the quality required by the signal to be delivered.

These Compounds are additive or subtractive. To reduce the Influence of this noise generated in the transmission circuit are usually Filtering devices used. These have the disadvantage, the production costs of the mobile phone and the additional material space requirements to increase. Furthermore, these facilities do not always guarantee a required quality the frequency characteristics of the signal to be output, if the production costs of the mobile phone should be kept low.

Of the cited above by SHEN FENG u. a. describes a mobile phone with a transmitting device using combined oscillation circuits is provided, of these oscillating circuits a first oscillation circuit a signal on a transit frequency FRF and a second oscillation circuit generates a signal on an intermediate frequency FI, whereby the transit and the intermediate frequency different from a frequency FTX of a Transmission signal, as well as a transmission method in a mobile phone, a modulator, a first, a second and a third Oscillation circuit comprises, wherein the first oscillation circuit a Signal generated on a transit frequency FRF and a first frequency divider for dividing by U, the second oscillation circuit comprises a signal generated on an intermediate frequency FI and a second frequency divider for dividing by V, and the third oscillation circuit Signal generated on a transmission frequency FTX.

The present invention seeks to remedy these problems and proposes a mobile phone in which a frequency value of the second oscillation circuit is variable even with frequency jumps in a given frequency range, for example the GSM frequency range. In the invention, a frequency value of the first oscillation circuit is dependent on a frequency value required by the third oscillation circuit and a frequency value of the second oscillation circuit.

Further For example, a transmission circuit can be controlled by means of a second-order low-pass filter be modeled with a cutoff frequency. In the invention one chooses dependent on from one for the signal to be output desired Frequency value a frequency value of the first oscillation circuit and a frequency value of the second oscillation circuit, thus harmonic noise, the additional be generated by the mixer, have a frequency value above the above limit frequency value is. Interference signals with a frequency above this Cutoff frequency of this low-pass filter are attenuated. general speaking, the more the frequency values of the interference signals above this limit frequency value lie, the more effective is the solution of the invention. One causes a weakening in this way the interference signals based on the signal to be output. Filter devices are thus easier or even dispensable and / or cheaper and thus need less space.

at The invention is stored at each frequency hopping in a memory of Mobile phones read a table in which to deliver for a frequency value of the Signal parameters for a chosen one Frequency value of the first oscillation circuit and a selected frequency value of the second oscillation circuit can be found. First and second Oscillation circuit are dependent adjusted to a value of the parameters read.

The present invention thus relates to a mobile telephone with a transmitting device which is provided with combined oscillating circuits, of which oscillating circuits a first oscillation circuit generates a signal at a transit frequency FRF and a second oscillation circuit generates a signal at an intermediate frequency FI, wherein the transit and the intermediate frequency being different from a frequency FTX of a transmission signal, characterized in that it comprises a table with two coefficients U and V which are to be read for a frequency value F _{i of} the transmission signal, each coefficient being converted into a signal sent to a control input of an oscillation circuit, the two coefficients U and V, when the frequency of the transmission signal transitions from a value F _i to a subsequent value F _{i + 1} , of values A + i and B, respectively to values A + i + 1 and B pass, and where the two coefficients U and V, when the frequency of the transmission signal from a value F _{i + k} to a subsequent F _{i + k + 1} , from values A + i + k and B to values A + j and C, respectively, where j ≠ i + k + 1 and C ≠ B and k> 0.

• – man eine Tabelle mit Wertepaaren zweier Koeffizienten U und V speichert, die jeweils Teilungswerte des ersten bzw. zweiten Frequenzteilers in einem Speicher des Mobiltelefons wiedergeben,
• – man eine Frequenz FTX für den dritten Oszillationskreis bestimmt und in der Tabelle ein Wertepaar der beiden Koeffizienten U und V abliest, das dieser Frequenz FTX entspricht,
• – man den ersten und den zweiten Frequenzteiler mit den Werten der jeweils in der Tabelle abgelesenen Koeffizienten U und V einstellt, wobei zum Speichern der Tabelle (22) folgende Schritte durchgeführt werden: a) – man bestimmt eine Frequenz FTX, b) – man wählt für die Frequenz FTX mögliche Frequenzen FI und FRF aus, c) – man berechnet die harmonischen Frequenzen nFI, mFRF und kFTX dieser möglichen Frequenzen, d) – man berechnet eine resultierende Frequenz nFI + mFRF + kFTX mit n, m und k, die relative ganze Zahlen sind, e) – man prüft, ob unabhängig von den Werten von n, m und k die resultierende Frequenz größer λFc ist, wobei λ eine ganze Zahl über Null und Fc eine Grenzfrequenz eines Tiefpassfilters ist, der von den drei Oszillationskreisen (4–6) gebildet wird, wobei der zweite Oszillationskreis (5) am Eingang und der dritte Oszillationskreis (6) am Ausgang angeordnet ist, f) – man bildet eine Frequenzgruppe ausgehend von einer Einheit möglicher Frequenzen FI, FRF und einer Frequenz FTX, die der Verifizierung genügen, g) – man speichert in der Tabelle (22) mit Linien und Spalten (24, 25) ein Wertepaar der entsprechenden Koeffizienten U und V, durch Multiplikation der jeweils möglichen genügenden Frequenzen FRI und FI mit einer Transit-Richtfrequenz oder einer Zwischen-Richtfrequenz, wobei ein Frequenzpaar durch eine Frequenz FTX gekennzeichnet ist, die einer Zeile der Tabelle zugeordnet ist, h) – man wiederholt die Schritte a) bis g) für eine neue Frequenz FTX des Ausgangssignals auf der Sendefrequenz, wobei ein neuer FTX-Frequenzwert auf der Grundlage einer früheren Frequenz FTX erhalten wird, die einen Frequenzsprung gemacht hat.

It further relates to a transmission method in a mobile telephone comprising a modulator, a first, a second and a third oscillation circuit, wherein the first oscillation circuit generates a signal on a transit frequency FRF and comprises a first frequency divider for dividing by U, the second oscillation circuit generates a signal on an intermediate frequency FI and comprises a second frequency divider for dividing by V, and the third oscillation circuit generates a signal on a transmission frequency FTX, characterized in that

• To store a table with value pairs of two coefficients U and V, which respectively represent division values of the first and second frequency divider in a memory of the mobile telephone,
• - one determines a frequency FTX for the third oscillation circuit and reads in the table a value pair of the two coefficients U and V, which corresponds to this frequency FTX,
• Setting the first and the second frequency divider with the values of the coefficients U and V respectively read in the table, wherein for storing the table ( 22 the following steps are performed: a) one determines a frequency FTX, b) one selects for the frequency FTX possible frequencies FI and FRF, c) one computes the harmonic frequencies nFI, mFRF and kFTX of these possible frequencies, d) - one calculates a resulting frequency nFI + mFRF + kFTX with n, m and k, which are relative integers, e) - one checks whether, irrespective of the values of n, m and k, the resulting frequency is greater than λFc, where λ is an integer above zero and Fc is a cut-off frequency of a low-pass filter, which is of the three oscillation circuits ( 4 - 6 ) is formed, wherein the second oscillation circuit ( 5 ) at the input and the third oscillation circuit ( 6 ) is arranged at the output, f) - one forms a frequency group starting from a unit of possible frequencies FI, FRF and a frequency FTX, which satisfy the verification, g) - one stores in the table ( 22 ) with lines and columns ( 24 . 25 ) a pair of values of the corresponding coefficients U and V, by multiplying the respective possible frequencies FRI and FI with a transit directivity or an intermediate directivity, wherein a frequency pair is characterized by a frequency FTX associated with one line of the table, h) - repeating steps a) through g) for a new frequency FTX of the output signal on the transmission frequency wherein a new FTX frequency value is obtained based on an earlier frequency FTX that has made a frequency hop.

The Invention will be better understood through reading the following description and study of the accompanying figures. These are presented by way of example only and are not limiting in any way for the invention. The figures show:

1 a mobile telephone with a transmitting device according to the invention;

2 : A representation in the form of a function algorithm of the transmission method of the invention.

1 shows a mobile phone according to the invention 1 , This mobile phone 1 comprises a receiving device 2 and a transmitting device 3 , The invention is particularly applicable to the transmitting device 3 applied. However, the invention could just as well apply to the receiving device 2 be applied. The sending device 3 includes an oscillation circuit 4 , an oscillation circle 5 and an oscillation circuit 6 , The oscillation circle 6 is usually a voltage controlled oscillator, which in the sequence oscillator 6 is called. These oscillation circuits 4 and 5 and this oscillator 6 are combined, in particular by means of a mixer 7 and a phase comparator 8th to form a broadcasting circle.

The mixer 7 includes two inputs 9 and 10 , The entrance 9 is to an output of the oscillation circuit 4 and the entrance 10 to an output of the oscillator 6 placed. The comparator 8th includes two inputs 11 and 12 , The entrance 11 is to an output of the comparator 7 and the entrance 12 to an output of the oscillation circuit 5 placed. The oscillator 6 includes an entrance 13 which is connected to an output of the comparator 8th is laid. The transmitter circuit thus produced adjusts to an output 14 of the oscillator 6 signal to be delivered. Mostly a connection between the output 14 of the oscillator 6 and the entrance 10 of the mixer 7 from a probe 15 produced. This sensor 15 draws this signal from the signal to be output and transmits it to the input 10 of the mixer 7 , That at the exit 14 signal to be output is sent to a power amplifier 16 transmitted, from which an input to an antenna 161 of the mobile phone 1 is created.

The mobile phone 1 further includes a microprocessor 17 , a program 18 in a program memory 19 , a data store 20 and a command, data and address bus 21 , The mobile phone 1 also includes a table 22 in the data store 20 with rows and columns. The table 22 includes a first column 23 with fields in which the frequency values FI of the signal to be output are entered. The table 22 further includes a second column 24 and a third column 25 for value pairs of the respective coefficients U and V to be read. A value of a coefficient is converted into a signal which is transmitted by the bus 21 each to the oscillation circuit 4 respectively. 5 is created. One line of this table 22 Thus, in corresponding fields, all parameters, in particular a value pair bound to a frequency of the signal to be delivered, of which a value in a field of the column are included 23 exactly this line is.

The program 18 controls the microprocessor 17 so that it calculates in a first step, a new frequency value for the signal to be output. In a second step, the microprocessor reads 17 in the table 22 a value pair of the coefficients U and V of a line characterized by a value F _{i of} the frequency of the signal to be output.

In a preferred example, the oscillation circuit 4 a phase-lock circuit, which is a reference oscillator 26 For example, a quartz oscillator, a phase comparator 27 , a circuit low-pass filter 28 , a voltage controlled oscillator 29 and a frequency divider 30 for dividing by a coefficient U. In the same way, the oscillation circuit comprises 5 a quartz reference oscillator 31 , a phase comparator 32 , a circuit low-pass filter 33 , a voltage controlled oscillator 34 and a frequency divider 35 for dividing by a coefficient V. An output of the oscillator 29 is at the entrance 9 of the mixer 7 placed. An output of the oscillator 34 is at the entrance 12 of the comparator 8th placed.

The mobile phone 1 is, for example, in a GSM frequency range, frequency hopping enabled. In this example, the frequency hopping capability of the signal to be output is achieved by frequency jumps, a value of which is a multiple of 200 kHz. In one example, the oscillator generates 26 a signal on a frequency of 200 kHz. The table 22 includes as many lines as frequency values used in the considered frequency range, such as the GSM frequency range. In a general case, two consecutive fields in the column 23 in the table 22 two consecutive values of the frequency of the signal to be output, of which a difference is equal to 200 kHz.

Thus, a value F of the frequency of the signal to be delivered in the same row corresponds to a coefficient U with a value A and a coefficient V with a value B. More generally, a value F _i corresponds to a coefficient U which is equal to A + i and a Coefficient V, which is equal to B. In a preferred example, the oscillator generates 26 a signal on a frequency of 200 kHz. A value of the coefficient U allows knowledge of a frequency value at the output of the oscillation circuit 4 , Namely, in a phase-locking circuit, a frequency value of the output signal is equal to the frequency value of the reference oscillator 26 , multiplied by the value of coefficient U. This value becomes the table 22 from the microprocessor 17 taken. So a value of the frequency of the signal at the output of the oscillator 29 in steps of 200 kHz, it is sufficient to increase a value of the coefficient U by one unit at a time. If you go in the table 22 by a a frequency value F _i associated line at a frequency value F _{i + 1,} a value of the coefficient U assumes a value A + i to a value A + i + 1. The coefficient V is, however, always equal to the value B. In a Frequency value equal to F _{i + k} is the coefficient U equal to A + i + k and the coefficient V is B. In the invention, the value of the coefficient U, when a frequency of the signal to be output from a value F _{i + k} to a value F _{i + k + 1} transitions from the value A + i + k to a value A + j, where j ≠ i + k + 1, and the coefficient V goes to a value C ≠ B.

In one variant are in the table 22 Frequency values stored instead of values of the coefficients U and V. In order to obtain a value of the coefficients U or V, a value of a read frequency is divided by a frequency value of the oscillator, respectively 26 or 31 , This allows the use of a universal, ie of a frequency value of the oscillators 26 and 31 independent table 22 , In the invention, in the table 22 however, preferably value pairs of the coefficients U and V are stored.

The invention further relates to a transmission method in the mobile telephone 1 , The oscillation circle 4 generates a signal on a frequency FRF. The oscillation circle 5 generates a signal on an intermediate frequency FI. The voltage controlled oscillator 6 generates a signal on a transmission frequency FTX. In the method of the invention, the table is stored 22 with two coefficients U and V, each having a division value of the divisor 30 or the divider 35 play in the memory 20 of the mobile phone 1 , With the help of the microprocessor 17 determines the program 18 a frequency FTX of the oscillator 6 for the signal to be output. The program applies a law of changing the FTX frequency values, which allows obtaining a pseudo-random time distribution of these frequencies FTX. To obtain such a law, for example, the GSM standard is known. If this value is calculated, look for the field of the column 23 which corresponds to this FTX frequency value. In this line you read in the columns 24 and 25 in each case the values of the value pair of the coefficients U or V ab. You put the divider 30 with the value read of the coefficient U and the divisor 35 with the value read off of the coefficient V.

More precisely, the mobile phone swaps 1 dates 36 with a mobile network 37 out. In a preferred example, these data become 36 in accordance with the TDMA (Time Division Multiple Access) access protocol. In this way, two transmissions of the mobile phone 1 separated by a fixed period that is longer than the duration of a transmission. So you put the divider 30 and 35 during these fixed times with values of the coefficients U and V, respectively. In the GSM example, the duration of a transmission is about 577 μs, and two transmissions are separated by at least a time of about 4.6 ms. Thus, the microprocessor 17 Frequency values of the oscillation circuits 4 and 5 in less than 4.6 ms, so that the device 3 is ready to start at the beginning of the next transmission phase.

To save the table 22 , by the transmission method of the mobile phone 1 is used, the following steps are performed. For a specific FTX frequency you are looking for possible FI and FRF frequencies. A particular FTX frequency is a frequency selected from all possible FTX frequencies of a given frequency range. The following calculation steps are actually steps of modeling generation of spurious signals in the transmission circuit.

The elements of the transmitting circuit, in particular the mixer 7 , namely, are non-linear elements. The mixer 7 thus generates noise at the output, which results from connections of harmonic signals on the frequency FRF and harmonic signals of the signal on the frequency FTX. These spurious signals also connect to harmonic signals generated on the frequency FI from the signal. In this way one obtains interference signals, of which a disturbing frequency is a compound which is additive or sub or both is harmonic signals that have arisen from the three FI, FRF and FTX signals. One can model the transmission circuit by means of a low-pass filter with cut-off frequency Fc. This filter thus attenuates interference signals, of which one frequency is above the frequency Fc. It weakens it all the more, the higher a disturbance frequency is above the frequency Fc and more generally above a frequency λ × Fc.

you can model this function by taking the harmonic frequencies nFI, mFRF and kFTX of these possible Frequencies and the specific frequency calculated. You calculate the interference frequency nFI + mFRF + kFTX. To calculate this noise frequency, it is assumed that the values n, m and k are corresponding whole relative numbers. You get such a noise frequency value through additive or subtractive combination of the individual harmonic Frequencies. You make the frequencies n, m and k variable. One checks, if all Values of the thus calculated interference frequency over the Frequency λFc lie, where λ is a whole positive number is.

So Looking for FRF and FI frequencies, all of which compounds harmonic Signals interference signals on higher Generate frequencies as λ × Fc. This search is for all FTX frequency values made.

you forms a frequency group starting from a unit of FI, FRF and FTX frequencies. This frequency group is a group at the harmonic frequencies are interference frequencies outside generate the bandwidth of the transmission circuit.

Then you store each element of this frequency group in corresponding fields of a row of the table 22 with two coefficients U and V. Actually you store values of the coefficients U and V, which allow you to obtain the frequencies FRI and FI of the corresponding frequency group by multiplying them by a reference frequency. A frequency group is therefore assigned a line which itself is characterized by an FTX frequency value. For a new FTX frequency value, repeat the above steps to determine a pair of frequencies FRF and FI that satisfy the criterion. That way, the table becomes 22 gradually filled out.

In a preferred example, λ is set to a value equal to 5 and limits the values of n, m and k to 60. Higher values correspond to harmonic frequencies of signals whose amplitudes are weak enough not to disturb the signal to be output. In this way one seeks frequencies FI and FRF, of which a combination of harmonic signals with a maximum value of 60, in particular for m, generates no interfering signals at a frequency below 5 Fc. In a by no means exhaustive example, the cutoff frequency Fc is about 800 kHz. This value Fc depends on the characteristics of the elements of the transmission circuit. As a rule, a low-pass filter (not shown) is placed between the output of the comparator 8th and the entrance 13 of the oscillator 6 , An object of this low-pass filter is the same as that of a circular filter in a phase-locked loop, in particular, the filtering of the comparator 8th outgoing signals. So you can get a different value of Fc, for example, by changing the properties of this low-pass filter.

In the description, it is assumed that the mobile phone 1 is a cover phone and works in a frequency range determined by the GSM standard. In a preferred variant, the phone is 1 a multi-band phone, ie, it can be at the request of a user of the mobile phone 1 operate in several frequency ranges, in particular standards. In a preferred example, the mobile phone 1 operate in frequency ranges determined by the GSM, DCS or POS standard. It could also work only in frequency ranges of the GSM or DCS standard or, more generally, in frequency ranges to which the invention is applicable.

In the event of a possible functioning of the mobile phone 1 in three frequency ranges, for example the GSM, DCS and PCS range, the device handles 3 a voltage controlled oscillator 38 from which an entrance 39 to the entrance 13 of the oscillator 6 is laid. The oscillator 38 is intended to generate signals to be delivered in the DCS and PCS frequency ranges, whereby, since these two frequency ranges are close to each other, a single oscillator is sufficient. An exit 40 of the oscillator 38 leads into a power amplifier 41 before going to the antenna 161 to be led. In one example you can see a diplexer circle 42 between the outputs of the amplifiers 16 and 41 and the antenna 161 in front. This diplexer circle 42 The task is to filter signals coming from the amplifiers 16 and 41 so that a transmission signal has no interference components outside a frequency range for which it is intended. This diplexer circle 42 includes two inputs 43 and 44 , The entrance 43 is at the output of the amplifier 16 and the entrance 44 to the output of the amplifier 41 placed, with the output of this Diplexerkreises to the antenna 161 is laid.

In order to be able to change from the GSM bandwidth, for example to the DCS bandwidth, the transmitting device comprises 3 a frequency divider 45 for sharing by N and a frequency divider 46 for dividing by R. The frequency divider 45 is between the output of the mixer 7 and the entrance 11 of the comparator 8th intended. The frequency divider 46 is between the output of the oscillator 34 and the entrance 12 of the comparator 8th intended. The two frequency dividers 45 and 46 are also by bus 21 connected. In the invention, values of N and R can be changed in one and the same frequency range. Thus, one frequency FTX has a wider choice of possible frequencies FI and FRF.

In a preferred variant, the table comprises 22 also two additional columns 47 and 48 , which include fields for values of the coefficients N and R, respectively. This is what the microprocessor represents 17 For each FTX frequency value, enter the values of the coefficients U, V, N and R.

In a preferred example, the oscillator 34 in an interval of 855 to 880 MHz, regardless of the frequency range in which the mobile phone works. This low frequency span allows the use of a single oscillator 34 for any frequency value of the signal to be delivered and independent of the frequency range in which the mobile phone 1 sends. In one example, the oscillator provides 31 a signal at a frequency of 1 MHz. In a preferred example, one selects the possible frequencies FI from an interval of 855 to 880 MHz. A value of V varies between 855 and 880.

In this preferred example, the FI and FRF frequency values follow the following table: FTX FRF FI N R GSM 880.2 880.4 ... 894.2 1393.2 1393.4 ... 1407.2 855 855 ... 855 3 5 894.4 894.6 ... 900.6 1410.4 1410.6 ... 1416.6 860 860 ... 860 3 5 900.8 901.0 ... 914.8 1425.2 1425.4 ... 1439.2 874 874 ... 874 3 5 DCS 1710.0 1710.2 ... 1736.8 2060.4 2060.6 ... 2087.2 876 876 ... 876 2 5 1737.0 1737.2 ... 1762.8 2081.4 2081.6 ... 2107.2 861 861 ... 861 2 5 1763.0 1763.2 ... 1785.0 2111.8 2112.0 ... 2133.8 872 872 ... 872 2 5 PCS 1850.2 1850.4 ... 1862.0 2199.4 2199.6 ... 2211.2 873 873 ... 873 2 5 1862.2 1862.4 ... 1875.0 2214.2 2214.4 ... 2227.0 880 880 ... 880 2 5 1875.2 1875.4 ... 1884.8 2226.0 2226.2 ... 2235.6 877 877 ... 877 2 5 1885.0 1885.2 ... 1892.6 2231.8 2232.0 ... 2239.4 867 867 ... 867 2 5 1892.8 1893.0 ... 1901.0 2241.2 2241.4 ... 2249.4 87 1 87 1 2 5 1901,2 1901,4 ... 1910,0 2251.2 2251.4 ... 2260.0 875 875 ... 875 2 5

The values of the coefficients N and R are fixed in a frequency range. This example is in no way exhaustive of the invention. This table indicates only preferred frequency values, but other frequency values are also conceivable in which generated interference frequencies are higher than the frequency Fc. Furthermore, one might as well have selected FI and FRF frequencies, the changes in the values of the coefficients cient N and R imply. In order to obtain other frequency values, one looks for frequencies FI and FRF whose connections of harmonic frequencies nFI + mFRF + kFTX> λFc verify.

2 shows a representation in the form of a functional algorithm of the transmission method of the invention. In a first step 49 For example, the method of the invention is in a phase of waiting for the request for a frequency hop. As long as no frequency hopping is requested, the method of the invention remains at this step 49 stand. A request preferably comes on command of the program 18 at a time when the mobile phone is in 1 does not send. It could as well arrive during a communication phase and be put in a waiting position until the end of the transmission process. When requesting a frequency hopping in step 50 gives the program 18 the microprocessor 17 the command to calculate a new FTX frequency value. To do this, the program applies 18 a pseudorandom exchange law, ie a determinant law whose statistical characteristics for the determination of this new value are those of a law of chance. This step 50 The pre-calculations could ultimately also be carried out during a transmission period. In one step 51 is looking for the microprocessor 17 in the table 22 the line marked by this FTX frequency value. One reads in the fields of the columns 24 . 25 . 47 and 48 In each case the values of the coefficients U, V, N and R depend on this line. The microprocessor 17 puts in one step 52 the frequency divider 30 . 35 . 45 and 46 with the in step 51 read values of the coefficients U, V, N and R. The process is back in phase 49 waiting for a frequency hop request.

In one embodiment of the device of the invention, one sees in the mobile phone 1 a specialized circle (not shown). This specialized circle has the task of the method of the invention with the help of the program 18 apply and the frequency divider 30 . 35 . 45 and 46 adjust. He is from the microprocessor 17 Synchronized, which indicates the times during which the settings can be made.

Claims (7)

Mobile phone ( 1 ) with a transmitting device ( 3 ), combined with combined oscillation circuits ( 4 . 5 ), of these oscillating circuits a first oscillation circuit ( 4 ) a signal on a transit frequency FRF and a second oscillation circuit ( 5 ) generates a signal on an intermediate frequency FI, wherein the transit and the intermediate frequency are different from a frequency FTX of a transmission signal, characterized in that it comprises a table with two coefficients U and V, which are to be read for a frequency value F _{i of} the transmission signal in which each coefficient is converted into a signal which is applied to a control input of an oscillation circuit, and in that the two coefficients U and V, when the frequency of the transmission signal changes from a value F _i to a subsequent value F _{i + 1} , from values A + i and B to values A + i + 1 and B, respectively, and that the two coefficients U and V when the frequency of the transmission signal changes from one value F _{i + k} to a subsequent one F _{i + k + 1} , from values A + i + k and B to values A + j and C, respectively, where j ≠ i + k + 1 and C ≠ B and k> 0. Sending procedure in a mobile phone ( 1 ), comprising a modulator, a first, a second and a third oscillation circuit, wherein the first oscillation circuit ( 4 ) generates a signal on a transit frequency FRF and a first frequency divider ( 30 ) for dividing by U, the second oscillation circuit generates a signal at an intermediate frequency FI and a second frequency divider ( 35 ) for dividing by V, and the third oscillation circuit ( 6 ) generates a signal on a transmission frequency FTX, characterized in that - a table ( 22 ) stores with value pairs of two coefficients U and V, the respective division values of the first and second frequency divider ( 30 . 35 ) in a memory ( 18 ) of the mobile phone ( 1 ), - one frequency FTX for the third oscillation circuit ( 6 ) and in the table ( 22 ) reads a value pair of the two coefficients U and V, which corresponds to this frequency FTX, - the first frequency divider ( 30 ) and the second frequency divider ( 35 ) with the values in each case in the table ( 22 ) read off the coefficients U and V read, and for storing the table ( 22 the following steps are performed: a) one determines a frequency FTX, b) one selects for the frequency FTX possible frequencies FI and FRF, c) one computes the harmonic frequencies nFI, mFRF and kFTX of these possible frequencies, d) - one calculates a resulting frequency nFI + mFRF + kFTX with n, m and k, which are relative integers, e) - one checks whether, irrespective of the values of n, m and k, the resulting frequency is greater than λFc, where λ is an integer above zero and Fc is a cut-off frequency of a low-pass filter, which is of the three oscillation circuits ( 4 - 6 ) is formed, wherein the second oscillation circuit ( 5 ) at the entrance and the third oscillation circle ( 6 ) is arranged at the output, f) - one forms a frequency group starting from a unit of possible frequencies FI, FRF and a frequency FTX, which satisfy the verification, g) - one stores in the table ( 22 ) with lines and columns ( 24 . 25 ) a pair of values of the respective coefficients U and V, by multiplying the respective possible sufficient frequencies FRI and FI with a transit reference frequency or an intermediate reference frequency, a frequency pair being characterized by a frequency FTX associated with a row of the table, h ) - repeat steps a) to g) for a new frequency FTX of the output signal on the transmission frequency, obtaining a new FTX frequency value based on an earlier frequency FTX which has made a frequency hopping. Method according to claim 2, characterized in that that - man Values of n, m and k below 60 are selected. Method according to one of claims 2 or 3, characterized that - one λ on one Value sets larger or is 2, preferably 5. Method according to one of claims 2 to 4, characterized that - man FTX in a defined by the GSM, DCS or PCS standard depending on the use Transmit frequency range makes variable and frequency jumps by one Value of a multiple of 200 KHz. Method according to one of claims 2 to 5, characterized that - man the possible ones Intermediate frequencies FI selected from an interval of 855 to 880 MHz. Method according to one of Claims 2 to 6, characterized in that the FI and FRF frequency values follow the following table: FTX FRF FI N R GSM 880.2 880.4 ... 894.2 1393.2 1393.4 ... 1407.2 855 855 ... 855 3 5 894.4 894.6 ... 900.6 1410.4 1410.6 ... 1416.6 860 860 ... 860 3 5 900.8 901.0 ... 914.8 1425.2 1425.4 ... 1439.2 874 874 ... 874 3 5 DCS 1710.0 1710.2 ... 1736.8 2060.4 2060.6 ... 2087.2 876 876 ... 876 2 5 1737.0 1737.2 ... 1762.8 2081.4 2081.6 ... 2107.2 861 861 ... 861 2 5 1763.0 1763.2 ... 1785.0 2111.8 2112.0 ... 2133.8 872 872 ... 872 2 5 PCS 1850.2 1850.4 ... 1862.0 2199.4 2199.6 ... 2211.2 873 873 ... 873 2 5 1862.2 1862.4 ... 1875.0 2214.2 2214.4 ... 2227.0 880 880 ... 880 2 5 1875.2 1875.4 ... 1884.8 2226.0 2226.2 ... 2235.6 877 877 ... 877 2 5 1885.0 1885.2 ... 1892.6 2231.8 2232.0 ... 2239.4 867 867 ... 867 2 5 1892.8 1893.0 ... 1901.0 2241.2 2241.4 ... 2249.4 87 1 87 1 2 5 1901,2 1901,4 ... 1910,0 2251.2 2251.4 ... 2260.0 875 875 ... 875 2 5