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

• US 7,983,140 B2
• Filed: 12/03/2004
• Issued: 07/19/2011
• Est. Priority Date: 12/08/2000
• Status: Active Grant

• Current Assignee: Redwood Technologies, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takahashi, Hiroaki, Suzuki, Mitsuhiro
• Primary Examiner(s): Gesesse; Tilahun
• Application Number:
  US11/004,256
• Publication Number:
  US 20050152302A1
• Time in Patent Office: 2,419 Days
• Field of Search: 455/502, 455/503, 455/560, 455/561, 455/506, 455/507, 455/67.11, 455/226.1, 455/524, 455/525, 455/456.1, 455/500, 455/562.1, 370/350, 370/365
• US Class Current: 370/204
• 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, in an orthogonal frequency division multiplexing wireless communication system, comprising:

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

a frame generator for generating a frame that includes a series of n (greater than

     1) time slots and a frame guard period added to the series of n time slots, each time slot including an effective symbol period and guard period added to the effective symbol period, where the length of the series of n time slots is less than the length of the frame; 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, in an orthogonal frequency division multiplexing wireless communication system, comprising:

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

a frame generator for generating a frame that includes a series of n (greater than

     1) time slots and a frame guard period added to the series of n time slots, each time slot including an effective symbol period and guard period added to the effective symbol period, where the frame guard period is a non-signal period, and the length of the series of n time slots is less than the length of the frame; 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 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.

8. 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.

9. 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.

10. 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.

11. 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 (greater than

     1) time slots and a frame guard period added to the series of n time slots, wherein the frame guard period is a non-signal period;

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

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.