Radio communication equipment and communication method
AssigneeRoot, Inc.
InventorHiroshi Mano
Life of this patent
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Abstract
The radio communication apparatus (10) comprises a buffer (14) which temporarily stores data to be sent, a transmission/receiving circuit (12) having a data transmission circuit (30) and a data receiving circuit (40). The data transmission circuit (30) includes an input processor (41) which generates, when transmitting the data, a preamble to output it to a QPSK modulator (42), thereafter reads from the buffer (14) a data row of 256 bits and outputs it to the QPSK modulator (42). Accordingly, the transmission circuit (30) is constituted such that the data sets each including the preamble and the data row are repeatedly transmitted. On the other hand, the receiving circuit (40) includes a DMF (86) which accomplishes acquisition using a portion in the received data corresponding to the preamble.
Claims14
A radio communication apparatus using spectrum spread, comprising a transmission circuit which generates modulated signals by use of primary modulation and spreading of data to be sent and a receiving circuit which obtains data by use of de-spreading and demodulation of received signals, the apparatus comprising:
- a data divider which divides the data to be sent into a plurality of data rows each having a prescribed length;
- and
- a data generator which receives said data rows and generates data sets each including a prescribed preamble and the data row,
- said transmission circuit repeatedly transmitting the data sets each including the preamble and data row, and said receiving circuit receiving the data sets and capturing a portion of the received signal which corresponds to the preamble to accomplish acquisition, wherein
- said prescribed length of the data row is determined based on an error between a clock speed or clock frequency used in the transmission circuit and another clock speed or clock frequency which is expected to be used in a destination receiving circuit.
A radio communication apparatus using spectrum spread, comprising a transmission circuit including a primary modulator which subjects data to be sent to primary modulation and a spread circuit which subjects the primarily modulated data to the spectrum spread so as to generate and transmit modulated signals, and a receiving circuit which subjects received signals to de-spreading and demodulation so as to restore data, the apparatus comprising:
- a buffer which temporarily stores the data to be sent;
- an input processor which generates a preamble and outputs it to the primary modulator, and thereafter, reads from said buffer a data row having a prescribed length and outputs it to the primary modulator, wherein the transmission circuit repeatedly transmits data sets each including said preamble and said data row supplied from said input processor, and wherein said receiving circuit receives the data sets and captures a portion of the received signal which corresponds to the preamble to accomplish acquisition, wherein
- said prescribed length of the data row is determined based on an error between a clock speed or clock frequency used in the transmission circuit and another clock speed or clock frequency which is expected to be used in a destination receiving circuit.
A transmitter using spectrum spread, comprising a primary modulator which subjects data to be sent to primary modulation and a spread circuit which subjects the primarily modulated data to spectrum spread so as to generate and transmit modulated signals, the transmitter comprising:
- a buffer which temporarily stores data to be sent;
- an input processor which generates a preamble and outputs it to the primary modulator, and thereafter, reads from said buffer a data row having a prescribed data length and outputs it to the primary modulator, wherein the transmitter repeatedly transmits data sets each including said preamble and said data row supplied from said input processor, and wherein said prescribed length of the data row is determined based on an error between a clock speed or clock frequency used in the transmission circuit and another clock speed or clock frequency which is expected to be used in a destination receiving circuit.
A receiver using spectrum spread which subjects received signals constituted of data sets each including a preamble and a data row having a prescribed length to de-spreading and demodulation so as to restore data, the receiver comprising:
- a data capture circuit which receives the signal and captures a portion in the received signal which corresponds to the preamble to accomplish acquisition, wherein said prescribed length of the data row is determined based on an error between a clock speed or clock frequency used in the transmission circuit and another clock speed or clock frequency which is expected to be used in a destination receiving circuit.
A method for transmitting data using spectrum spread which is accomplished by a primary modulator which subjects data to be sent to primary modulation and a spread circuit which subjects the primarily modulated data to spectrum spread so as to generate and transmit the modulated signals, the method comprising steps of:
- when having to transmit data, generating a preamble and outputting it to the primary modulator;
- and
- after outputting the preamble, reading a data row having a prescribed length from a buffer which temporarily stores the data to be sent and outputting the data row to the primary modulator, wherein
- the data sets each including said preamble the data row supplied from the input processor are repeatedly transmitted, and wherein
- said prescribed length of the data row is determined based on an error between a clock speed or clock frequency used in the transmission circuit and another clock speed or clock frequency which is expected to be used in a destination receiving circuit.
A method for receiving data using spectrum spread, which subjects received signals constructed of data sets each including a preamble and a data row having a prescribed length to de-spreading and demodulation so as to restore data, the method comprising steps of:
- accomplishing acquisition using a portion in the received signal corresponding to said preamble;
- and
- subjecting a portion corresponding to said data row to de-spreading and demodulation so as to restore data, wherein
- said prescribed length of the data row is determined based on an error between a clock speed or clock frequency used in the transmission circuit and another clock speed or clock frequency which is expected to be used in a destination receiving circuit.
Dependencies are inferred from the claim text.