Enhanced Bit Mapping for Digital Interface of a Wireless Communication Equipment in Multi-Time Slot and Multi-Mode Operation

• US 20080095248A1
• Filed: 07/12/2005
• Published: 04/24/2008
• Est. Priority Date: 07/29/2004
• Status: Active Grant

• Current Assignee: ST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Bauer, Harald, Bode, Peter, Helfenstein, Markus, Dietsch, Rainer
• Granted Patent: US 8,102,937 B2
• Time in Patent Office: Days
• US Class Current: 375/256
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04W 52/04 TPC

Abstract

A control device (CD) is dedicated to the control of the transmission of coded values onto a digital interface (I) connecting a baseband device (BBD) and a baseband interface device (BAI), comprising at least a modulator (M) feeding a gain controller (GC), of a wireless communication equipment. The control device (CD) comprises a storing means (MM1) for storing a coding table establishing a correspondence between symbols for the baseband interface device (BAI) and coding values to transmit to this radiofrequency device through the digital interface (I). Tie coding table comprises a first group of symbols comprising data words for feeding the modulator (M) and a second group of symbols comprising command words for controlling the operation of the modulator (M) and/or the gain controller (GC). The control device (CD) also comprises a control means (CRM) arranged, when it receives a symbol from the baseband device (BBD), to determine in the storing means (MM 1) the coded value corresponding to this symbol in order it could be transmitted to the baseband interface device (BAI) through the digital interface (I).

Claims

1. Control device for controlling transmission of coded values onto a digital interface connecting a baseband device and a baseband interface device comprising at least a modulator feeding a gain controller of a wireless communication equipment, said control device comprising a storing means for storing a coding table establishing a correspondence between symbols for said baseband interface device and coding values to transmit to said baseband interface device through said digital interface characterized in that said coding table comprises a first group of symbols comprising data words for feeding said modulator and a second group of cymbols comprising command words for controlling the operation of said modulator and/or said gain controller and that it also comprises a control means arranged, when it receives a symbol from the baseband device to determine in said storing means the coded value corresponding to this symbol in order it could be transmitted to said baseband interface device through said digital interface.

2. Control device according to claim 1, characterized in that at least one of the symbols of said second group is a command word for assigning a chosen gain value to said gain controller.

3. Control device according to claim 1, characterized in that at least one of the symbols of said second group is a command word for assigning a chosen working mode to a filter means and/or a modulation means of said modulator.

4. Control device according to claim 1, characterized in that at least one of the symbols of said second group is a command word for assigning a chosen working mode to a filter means and/or a modulation means of said modulator and a chosen gain value to said gain controller.

5. Control device according to claim 3, characterized in that said working mode is chosen in a group comprising at least an initialization mode to pre-load said filter means with a chosen sequence of rotated valid symbols for an immediate up-ramping of said modulator a reset mode to force binary values of zero into said filter means of said modulator for an immediate down-ramping of said modulator and a forced to zero mode to force at least one binary value of zero into said modulator.

6. Control device according to claim 5, characterized in that it is arranged to deliver a command word for assigning an initialization mode before transmission to said filter means of a last guard bit filling a guard interval.

7. Control device according to claim 5, characterized in that it is arranged to deliver a command word for assigning a reset mode just after the transmission of an active part of a data burst to said filter means and during a guard interval.

8. Control device according to claim 1, wherein said modulator comprises a GMSK I/Q modulator and a 8PSK IQ modulator characterized in that each coded value is a four-bit word comprising three most significant bits and a low significant bit to differentiate said GMSK I/Q modulator and said 8PSK I/Q modulator.

9. Control device according to claim 8, characterized in that said first group comprises at least eight symbols and said second group comprises at least six symbols.

10. Baseband device for a wireless communication equipment comprising a baseband interface device adapted to be connected to said baseband device through a digital interface characterized in that it comprises a control device according to claim 1.

11. Baseband interface device for a wireless communication equipment comprising a baseband device according to claim 10, connected to it through a digital interface said baseband interface device comprising at least a modulator and a gain controller fed by said modulator characterized in that it comprises i) a storing means adapted to store a control table establishing a correspondence between coding values, transmitted by said digital interface and symbols representing command words for controlling its operation and data words for feeding said modulator and ii) a control means connected to said digital interface modulator and gain controller and arranged, when it receives a coding value from said digital interface to determine in said storing means the word corresponding to said received coding value in order to transmit to said modulator and/or said gain controller.

12. Baseband interface device according to claim 11, characterized in that it constitutes a baseband and audio interface device.

13. Baseband interface device for a wireless communication equipment comprising a baseband device connected to it through a digital interface and a control device according to claim 1, said baseband interface device comprising at least a modulator and a gain controller fed by said modulator characterized in that it comprises i) a storing means adapted to store a control table establishing a correspondence between coding values, transmitted by said digital interface and symbols representing command words for controlling its operation and data words for feeding said modulator and ii) a control means connected to said digital interface modulator and gain controller and arranged when it receives a coding value from said digital interface to determine in said storing means the word corresponding to said received coding value in order to transmit it to said modulator and/or said gain controller.

14. Baseband interface device according to claim 13, characterized in that it constitutes a baseband and audio interface device.

15. Wireless communication equipment comprising a baseband device and a digital interface characterized in that it comprises a control device according to claim 1, connected to said baseband device and a baseband interface device, connected to said baseband device trough said digital interface.

16. Wireless communication equipment, characterized in that it comprises a baseband device according to claim 10, a baseband interface device according to, and a digital interface connecting said baseband device to said baseband interface device.