DUAL BAND TRANSCEIVER

• US 20030013482A1
• Filed: 07/01/1999
• Published: 01/16/2003
• Est. Priority Date: 07/03/1998
• Status: Abandoned Application

• Current Assignee: Sony Limited (Sony Group Corp.)
• Original Assignee: Sony Limited (Sony Group Corp.)
• Inventors: BRANKOVIC, VESELIN
• Application Number:
  US09/345,856
• Publication Number:
  US 20030013482A1
• Time in Patent Office: Days
• US Class Current: 455/553.1
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

According to the present invention, a dual band transceiver is presented comprising a baseband block (1), frequency converting blocks (2, 3) and a plurality of antenna systems (4, 5). The first frequency converting block (3) is connected between the baseband block (1) and at least one antenna (4, 5) and converts an intermediate frequency IF1 output of the baseband block (1) or another frequency converting block (2). According to the present invention a first transmission frequency band RF1 of the dual band transceiver corresponds to the intermediate frequency IF1, IF2, and a second transmission frequency band RF2 is obtained as an output signal of the first frequency converting block (2, 3). Therefore communication device comprising a dual band transceiver according to the present invention can switch from a LOS transmission, for example, with a frequency higher than 10 GHz to a NLOS communication with a transmission frequency smaller than 10 GHz. For switching (6, 7) the frequencies RF1, RF2, a control unit (8) is provided, wherein the switch control effected by the control unit (8) is effected on the base of for example channel characteristics, user preferences, and the bit error rate of the transmission. The control unit (8) is furthermore connected to the baseband block (1) to change modulation parameters of the baseband block (1) simultaneously to the switching between the first transmission frequency band (RF1) and the second transmission frequency band (RF2).

Claims

1. Dual band transceiver, comprising

a baseband block (1),

at least a first frequency converting block (2, 3), and

at least one antenna (4, 5), wherein

the first frequency converting block (3) is connected between the baseband block (1) and at least one antenna (4, 5) and is adapted to convert an intermediate frequency (IF1, IF2) output of the baseband block (1) or output of another frequency converting block (2), and

a first transmission frequency band (RF1) of the dual band transceiver corresponds to the intermediate frequency (IF1, IF2) and a second transmission frequency band (RF2) is obtained as an output signal of the first frequency converting block (2, 3), wherein a control unit (8) is provided to control a switching between the first transmission frequency band (RF1) and the second transmission frequency band (RF2) and the control unit (8) is connected to the baseband block (1) to be able to change modulation parameters of the baseband block (1) simultaneously to the switching between the first transmission frequency band (RF1) and the second transmission frequency band (RF2).

2. Dual band transceiver according to claim 1, characterized in that

a first switch (6) is provided upwardly of the first frequency converting block (3),

wherein the first switch (6) is controlled by the control unit (8) such that selectively either a signal in the first transmission frequency band (RF1) or the second transmission frequency band (RF2) is transmitted/received.

3. Dual band transceiver according to claim 2, characterized in that

the control unit (8) is adapted to control the first switch (6) on the basis of channel characteristics, a bit error rate of the transmission and/or user preferences.

4. Dual band transceiver according to anyone of the preceding claims, characterized in that

the first transmission frequency band (RF1) is below 10 GHz and the second transmission frequency band (RF2) is higher than 10 GHz.

5. Dual band transceiver according to claim 4, characterized in that

the first transmission frequency band (RF1) is between 5 and 6 GHz and the second transmission frequency band (RF2) is 24 GHz, 40 GHz or 60 GHz.

6. Dual band transceiver according to anyone of the preceding claims, characterized in that

a second switch (9) is provided to control the modulation depth used by the baseband block (1), wherein the control unit (8) is adapted to control the second switch (9) simultaneously to the first switch (6).

7. Dual band transceiver according to anyone of the preceding claims, characterized in that

the control unit (8) is adapted to change the modulation technique used by the base band block (1) in accordance with a change of the transmission frequency band (RF1, RF2) used.

8. Dual band transceiver according to claim 7, characterized in that

the spectral efficiency of the transmission in the first transmission frequency band (RF1) is higher than the spectral efficiency of the transmission the second transmission frequency band (RF2).

9. Dual band transceiver according to claim 7 or 8, characterized in that

the control unit (8) is adapted to control the baseband block (1) such that a (D)8PSK or (D)QPSK modulation is used when the control unit (8) controls the switch (6) such that the first transmission frequency band (RF1) is used.

10. Dual band transceiver according to anyone of claims 7 to 9, characterized in that

the control unit (8) is adapted to control the baseband block (1) such that a (D)8PSK, (D)QPSK, 16QAM or 64QAM modulation is used when the control unit (8) controls the switch (6) such that the second transmission frequency band (RF2) is used.

11. Dual band transceiver according to anyone of claims 7 to 10, characterized in that

the control unit (8) is adapted to control the second switch (9) and the switch (6) such that the resulting transmission channel bandwidth remains constant.

12. Dual band transceiver according to anyone of the preceding claims, characterized in that

a third switch (10) is provided to control the power level of at least one of the frequency converting blocks (2, 3), wherein the third switch (10) is controlled by the control unit (8).

13. Dual band transceiver according to anyone of the preceding claims, characterized in that

the baseband block (1) is adapted to operate according to an OFDM modulation technique.

14. Dual band transceiver according to anyone of the preceding claims, characterized in that

different antenna systems (4, 5) are provided to be used respectively when the first or the second transmission frequency band (RF1, RF2) is used.

15. Dual band transceiver according to claim 14, characterized in that

the different antenna systems (4, 5) comprise different antenna gains.

17. Dual band transmission method according to claim 16, characterized by the step of

selectively controlling (6, 8) the upconversion step(s) such that selectively either a signal in the first transmission frequency band (RF1) or the second transmission frequency band (RF2) is transmitted.

20. Dual band transmission method according to claim 19, characterized in that

the first transmission frequency band (RF1) is between 5 and 6 GHz and the second transmission frequency band (RF2) is 24 GHz.

16. Dual band transmission method, comprising the following steps of:

modulation (1) of data to be transmitted on a first intermediate frequency (IF1) to obtain a modulated signal, in a baseband block (1),

at least one upconversion (2, 3) of the modulated signal with the first intermediate frequency (IF1) to a second intermediate frequency (IF2), and

transmission (4, 5) of the modulated signal in a first or a second transmission frequency band (RF1, RF2), wherein

the first transmission frequency band (RF1) is an intermediate frequency (IF2) of the second transmission frequency band (RF2) and

a switching between the first transmission frequency band (RF1) and the second transmission frequency band (RF2) is performed simultaneously to a change of modulation parameters of the baseband block (1).

18. Dual band transmission method to anyone of the claims 16 or 17, characterized in that

the step of selectively controlling (6, 8) is effected on the basis of channel characteristics, a bit error rate of the transmission and/or user preferences.

19. Dual band transmission method according to anyone of claims 16 to 18, characterized in that

the first transmission frequency band (RF1) is below 10 GHz and the second transmission frequency band (RF2) is higher than 10 GHz.

21. Dual band transmission method according to anyone claims 16 to 20, comprising the step of

controlling (8, 9) the baseband block (1) such that the modulation depth used by the baseband block (1) is changed simultaneously to the selective control (6, 8) of the upconversion step (s).

22. Dual band transmission method according to anyone of claims 16 to 21, characterized in that

a control (8, 9) of the baseband block (1) is effected such that the modulation technique used by the base band block (1) is changed in accordance with a change of the transmission frequency band (RF1, RF2) used.

23. Dual band transmission method according to claim 22, characterized in that

the control (8, 9) of the baseband block (1) is effected such that a (D)8PSK or (D)QPSK modulation is used when the first transmission frequency band (RF1) is used for the transmission.

24. Dual band transmission method according to anyone of claims 22 or 23, characterized in that

the control (8, 9) of the baseband block (1) is effected such that a (D)8PSK, (D)QPSK, 16QAM or 64QAM modulation is used when the second transmission frequency band (RF2) is used for the transmission.

25. Dual band transmission method to anyone of claims 21 to 24, characterized in that

the control (8, 9) of the baseband block (1) and the control (6, 8) of the upconversion step(s) is effected such that the resulting transmission channel bandwidth remains constant.

26. Dual band transmission method according to anyone of claims 16 to 25, characterized by the step of

controlling (10) the power level of an upconversion step (2, 3).

27. Dual band transmission method according to anyone of claims 16 to 26, characterized in that

the baseband block (1) operates according to an OFDM modulation technique.

28. Dual band transmission method according to anyone of the claims 16 to 27, characterized in that

different antennas (4, 5) are used respectively when the first or the second transmission frequency band (RF1, RF2) is used.