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

• US 8,971,939 B2
• Filed: 06/15/2011
• Issued: 03/03/2015
• Est. Priority Date: 12/08/2000
• Status: Expired due to Fees

• 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:
  US13/160,699
• Publication Number:
  US 20110243271A1
• Time in Patent Office: 1,357 Days
• Field of Search: 370/208, 370/344, 370/450
• US Class Current: 455/502
• 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 transmission method performed in an orthogonal frequency division multiplexing wireless communication system, the method comprising:

converting a transmission signal into a transmission time slot;

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, the frame guard period being a non-signal period, and 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, wherein the frame guard period is separate from the guard period; and

transmitting the generated frame as a radio signal using a transmission apparatus, wherein the radio signal is an OFDM signal having the frame guard period.

2. A transmission method according to claim 1, further comprising:

modulating transmission information to produce the OFDM signal using a 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 transmission method according to claim 1, further comprising:

generating a time slot by adding a predetermined guard period to an effective symbol period.

4. The transmission method of claim 1, wherein the frame guard period is at the beginning and/or the end of the frame.

5. A transmission 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, the frame guard period being a non-signal period, and 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, wherein the frame guard period is separate from the guard period; and

a back-end transmission processing unit for transmitting the generated frame as a radio signal, wherein the radio signal is an OFDM signal having the frame guard period.

6. A transmission system according to claim 5, wherein the front-end transmission processing unit includes a modulator for modulating transmission information to produce the OFDM signal using a modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

7. A transmission system 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.

8. The transmission system of claim 5, wherein the frame guard period is at the beginning and/or the end of the frame.

9. A computer program, embodied in a non-transitory computer-readable medium, when executed on one or more processors, causing the one or more processors to perform steps comprising:

converting a transmission signal into a transmission time slot;

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, the frame guard period being a non-signal period, and 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, wherein the frame guard period is separate from the guard period; and

transmitting the generated frame as a radio signal, wherein the radio signal is an OFDM signal having the frame guard period.

10. A computer program according to claim 9, further causing the one or more processors to perform the step of:

modulating transmission information to produce the OFDM signal using a modulation scheme selected on the basis of electric field strength information received from a communication terminal to which the transmission information is transmitted.

11. A computer program according to claim 9, further causing the one or more processors to perform the step of:

generating a time slot by adding a predetermined guard period to an effective symbol period.

12. The computer program of claim 9, wherein the frame guard period is at the beginning and/or the end of the frame.