Transmitting apparatus, receiving apparatus, and communication system for formatting data

• US 20050152302A1
• Filed: 12/03/2004
• Published: 07/14/2005
• Est. Priority Date: 12/08/2000
• Status: Active Grant

• Current Assignee: Redwood Technologies, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Hiroaki Takahashi, Mitsuhiro Suzuki
• Inventors: Suzuki, Mitsuhiro, Takahashi, Hiroaki
• Granted Patent: US 7,983,140 B2
• Time in Patent Office: Days
• US Class Current: 370/321
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04J 3/00 Time-division multiplex systems H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/3405 Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

A transmitting apparatus, a receiving apparatus, and a communication system are provided that allow a reduction in a frame loss due to interference caused by use of the same channel. A transmitting apparatus disposed in a base station includes a GPS receiver for receiving a GPS signal, a timing generator for controlling respective function blocks in accordance with the GPS signal and an inter-base-station control signal so as to precisely synchronize the timing of frame transmission among base stations, the front-end transmission processing unit including for converting transmission information into transmission time slots, a frame generator for generating a frame including a plurality of time slots and one frame guard, and a back-end transmission processing unit for transmitting the generated frame as a radio signal.

Claims

1. A transmitting apparatus comprising

a front-end transmission processing unit for converting transmission signal into a transmission time slot;

and

a frame generator for generating a frame including a series of n (integer equal to or greater than

     1) time slots and a frame guard period added to the series of n time slots to suppress a frame loss due to interference; and

a back-end transmission processing unit for transmitting the generated frame as a radio signal.

2. A transmitting apparatus according to claim 1, wherein the front-end transmission processing unit includes a modulator for modulating transmission information by means of a proper modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

3. A transmitting apparatus according to claim 1, wherein the frame guard period is a non-signal period.

4. A transmitting apparatus according to claim 1, wherein the front-end transmission processing unit generates a time slot by adding a predetermined guard period to an effective symbol period.

5. A transmitting apparatus disposed in at least one of a plurality of base stations each of which has a capability of communicating, using a signal according to a predetermined modulation scheme, with a communication terminal being within an area assigned to the base station, the transmitting apparatus comprising:

a front-end transmission processing unit for converting transmission signal into a transmission time slot;

a frame generator for generating a frame including a series of n (integer equal to or greater than

     1) time slots and a frame guard period added to the series of n time slots to suppress a frame loss due to interference; and

a back-end transmission processing unit for transmitting the generated frame as a radio signal.

6. A transmitting apparatus according to claim 5, further comprising a timing generator for generating a timing signal on the basis of a GPS signal and an inter-base-station control signal for achieving synchronization among base stations, thereby precisely synchronizing the timing of frame transmission among the base stations.

7. A transmitting apparatus according to claim 5, wherein the front-end transmission processing unit includes a modulator for modulating transmission information by means of a proper modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

8. A transmitting apparatus according to claim 6, wherein the front-end transmission processing unit includes a modulator for modulating transmission information by means of a proper modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

9. A transmitting apparatus according to claim 5, wherein the frame guard period is a non-signal period.

10. A transmitting apparatus according to claim 6, wherein the frame guard period is a non-signal period.

11. A transmitting apparatus according to claim 5, wherein the front-end transmission processing unit generates a time slot by adding a predetermined guard period to an effective symbol period.

12. A transmitting apparatus according to claim 6, wherein the front-end transmission processing unit generates a time slot by adding a predetermined guard period to an effective symbol period.

13. A receiving apparatus for receiving a radio signal, each frame of which includes a series of n (integer equal to or greater than 1) time slots and a frame guard period added to the series of n time slots to suppress a frame loss due to interference, each time slot including an effective symbol period and a guard period added to the effective symbol period, the receiving apparatus comprising:

a front-end reception processing unit for receiving the radio signal;

a synchronization position detector for detecting a starting position of an effective symbol period in the received signal;

a timing generator for controlling an operation timing of a functional block, on the basis of synchronization position information supplied from the synchronization position detector;

a reception windowing unit for extracting only an effective symbol period including no time guard period and no frame guard, under the control of the timing generator; and

a back-end reception processing unit for reproducing desired information from a windowed signal supplied by the reception windowing unit.

14. A receiving apparatus according to claim 13, wherein the frame guard period is a non-signal period.

15. A receiving apparatus disposed in a communication terminal for receiving a radio signal transmitted from a base station each of which has a capability of communicating, using a signal according to a predetermined modulation scheme, with a communication terminal being within an area assigned to the base station, each frame of the radio signal including a series of n (integer equal to or greater than 1) time slots and a frame guard period added to the series of n time slots to suppress a frame loss due to interference, each time slot including an effective symbol period and a guard period added to the effective symbol period, the receiving apparatus comprising:

a front-end reception processing unit for receiving the radio signal;

a synchronization position detector for detecting a starting position of an effective symbol period in the received signal;

a timing generator for controlling an operation timing of a functional block, on the basis of synchronization position information supplied from the synchronization position detector;

a reception windowing unit for extracting only an effective symbol period including no time guard period and no frame guard, under the control of the timing generator; and

a back-end reception processing unit for reproducing desired information from a windowed signal supplied by the reception windowing unit.

16. A receiving apparatus according to claim 15, wherein the frame guard period is a non-signal period.

17. A communication system comprising a transmitting apparatus and a receiving apparatus,

the transmitting apparatus comprising:

a front-end transmission processing unit for converting transmission signal into a transmission time slot;

a frame generator for generating a frame including a series of n (integer equal to or greater than

     1) time slots and a frame guard period added to the series of n time slots to suppress a frame loss due to interference, each time slot including an effective symbol period and a guard period added to the effective symbol period; and

a back-end transmission processing unit for transmitting the generated frame as a radio signal,

the receiving apparatus comprising;

a front-end reception processing unit for receiving a radio signal transmitted from the transmitting apparatus;

a synchronization position detector for detecting a starting position of an effective symbol period in the received signal;

a timing generator for controlling an operation timing of a functional block, on the basis of synchronization position information supplied from the synchronization position detector;

a reception windowing unit for extracting only an effective symbol period including no time guard period and no frame guard, under the control of the timing generator; and

a back-end reception processing unit for reproducing desired information from a windowed signal supplied by the reception windowing unit.

18. A communication system according to claim 17, wherein the front-end transmission processing unit includes a modulator for modulating transmission information by means of a proper modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

19. A communication system according to claim 17, wherein the frame guard period is a non-signal period.

20. A communication system comprising:

a plurality of communication terminals; and

a plurality of base stations, each of which has a capability of communicating, using a signal according to a predetermined modulation scheme, with a communication terminal being within an area assigned to the base station,

at least one of the plurality of base stations including a transmitting apparatus, the transmitting apparatus comprising;

a front-end transmission processing unit for converting transmission signal into a transmission time slot;

a frame generator for generating a frame including a series of n (integer equal to or greater than

     1) time slots and a frame guard period added to the series of n time slots to suppress a frame loss due to interference, each time slot including an effective symbol period and a guard period added to the effective symbol period; and

a back-end transmission processing unit for transmitting the generated frame as a radio signal,

each communication terminal including a receiving apparatus comprising;

a front-end reception processing unit for receiving a radio signal transmitted from the transmitting apparatus;

a synchronization position detector for detecting a starting position of an effective symbol period in the received signal;

a timing generator for controlling an operation timing of a functional block, on the basis of synchronization position information supplied from the synchronization position detector;

a reception windowing unit for extracting only an effective symbol period including no time guard period and no frame guard, under the control of the timing generator; and

a back-end reception processing unit for reproducing desired information from a windowed signal supplied by the reception windowing unit.

21. A communication system according to claim 20, wherein the transmitting apparatus further comprises a timing generator for generating a timing signal on the basis of a GPS signal and an inter-base-station control signal for achieving synchronization among base stations, thereby precisely synchronizing the timing of frame transmission among the base stations.

22. A communication system according to claim 20, wherein the front-end transmission processing unit of the transmitting apparatus includes a modulator for modulating transmission information by means of a proper modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

23. A communication system according to claim 21, wherein the front-end transmission processing unit of the transmitting apparatus includes a modulator for modulating transmission information by means of a proper modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

24. A communication system according to claim 20, wherein the frame guard period is a non-signal period.

25. A communication system according to claim 21, wherein the frame guard period is a non-signal period.