Frequency staggered frequency shift keying modulation

• US 20050226348A1
• Filed: 04/06/2005
• Published: 10/13/2005
• Est. Priority Date: 04/07/2004
• Status: Active Grant

• Current Assignee: Sony Deutschland GmbH (Sony Group Corp.)
• Original Assignee: Sony International Europe Gmbh (Sony Group Corp.)
• Inventors: Stirling-Gallacher, Richard, Jurgensen, Jens-Uwe
• Granted Patent: US 7,457,370 B2
• Time in Patent Office: Days
• US Class Current: 375/303
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04L 27/12 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/148 using filters, including PLL-type filters
• CPC Class Codes: H04L 27/152 using controlled oscillators, e.g. PLL arrangements
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
• CPC Class Codes: H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26

Abstract

A frequency modulation method is proposed that enables an imprinting of a digital message formed by a sequence of symbols on a set of frequency bands. Each symbol of the digital message is hereby assigned just one symbol value out of a defined set of symbol values. According to the method at least two symbol transmission channels are defined with each symbol transmission channel being formed by a sub-set of frequency bands selected from the set of frequency bands and with each frequency band of a symbol transmission channel being allocated to a symbol value of the set of symbol values in a one-to-one relation such, that the symbol transmission channels defined differ from each other in at least one frequency band selected and/or in an allocation of a frequency band to a symbol value. Further, each of the defined symbol transmission channels is successively modulated with a single symbol value of the digital message according to the channel allocation scheme of the respective symbol transmission channel.

Claims

1. A frequency modulation method for imprinting a digital message formed by a sequence of symbols on a set of frequency bands, whereby each symbol is assigned one symbol value out of a defined set of symbol values, the method comprising steps of

defining at least two symbol transmission channels, each symbol transmission channel being formed by a sub-set of frequency bands selected from the set of frequency bands and each frequency band of a symbol transmission channel being allocated to a symbol value of the set of symbol values in a one-to-one relation, such that the symbol transmission channels defined differ from each other in at least one frequency band selected and/or in an allocation of a frequency band to a symbol value, and

modulating each of the defined symbol transmission channels successively with a single symbol value of the digital message according to the allocation defined for the frequency bands of the respective symbol transmission channel.

2. A method according to claim 1,

characterised in

that the method further comprises the steps of

defining a usage order for modulating the defined symbol transmission channels, and

modulating each symbol transmission channel successively according to the defined usage order.

3. A method according to claim 1,

characterised in

that the defined symbol transmission channels are reused for effecting a modulation with symbol values of the digital message upon the number of symbols in the digital message exceeding the number of defined symbol transmission channels.

4. A method according to claim 3,

characterised in

that the defined symbol transmission channels are reused in the order used for modulating the defined symbol transmission channels with the first symbol values of the digital message.

5. A method according to claim 3

characterised in

that the defined symbol transmission channels are reused in an order different to the order used for modulating the defined symbol transmission channels with the first symbol values of the digital message.

6. A method according to claim 1,

characterised in

that the modulation of a defined symbol transmission channel with a single symbol value is effected by up-converting a baseband shaped pulse signal to the frequency band of the respective symbol transmission channel which is allocated to the respective single symbol value.

7. A method according to claim 6,

characterised in

that the bandwidth of the baseband shaped pulse signal corresponds to the bandwidth defined for the frequency band to which it is up-converted.

8. A method according to claim 1,

characterised in

that at least two sub-channels are defined for a frequency band of the set of frequency bands such that the phase angles of any two sub-channels defined for a frequency band are different.

9. A conversion controller for a frequency shift keying transmitter and for a frequency shift keying receiver, the controller comprising:

a symbol transmission channel definition means for defining at least two symbol transmission channels with each symbol transmission channel being formed by a sub-set of frequency bands selected from a set of frequency bands

an allocation means for allocating each frequency band of a symbol transmission channel to a symbol value of the set of symbol values in a one-to-one relation such, that the symbol transmission channels defined differ from each other in at least one frequency band selected and/or in an allocation of a frequency band to a symbol value,

an output means for outputting a control signal to an oscillator, whereby the control signal is adapted to adjust the oscillator frequency to the centre frequency of the frequency band used for modulating a respective symbol transmission channel.

10. A conversion controller according to claim 9,

characterised in

that the symbol transmission channel definition means further comprises a sub-channel definition means for defining at least two sub-channels with different phase angles for each frequency band.

11. A conversion controller according to claim 10,

characterised in

that the output means is further adapted to control the phase of an oscillator according to the phase angle defined for a sub-channel.

12. A transmitter having a conversion controller according to claim 9.