Transmitting apparatus, receiving apparatus, and communication system for formatting data
View Patent ↗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.
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.