ARQ apparatus and method using frequency diversity in an OFDM mobile communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsJung-Je Son, Dae-Eop Kang, Dae-Sik Hong, Eun-Seok Ko, Pan-Yuh Joo
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Abstract
A transmission method and apparatus in a mobile communication system, which modulates input data with a specific size into an OFDM symbol before transmission. In the transmission apparatus, a controller determines to transmit replica data instead of the input data, if the input data is retransmission data. A replica generator generates replica data by cyclically-circulating the input data under the control of the controller. An IFFT block generates an OFDM symbol by IFFT-transforming the replica data.
Claims17
A transmission apparatus in a mobile communication system, which modulates input data with a specific size into an OFDM (Orthogonal Frequency Division Multiplexing) symbol before transmission, the apparatus comprising:
- a controller for determining whether to transmit replica data instead of the input data, if the input data is retransmission data;
- a replica generator for generating the replica data by cyclically-circulating the input data under control of the controller;
- and
- an IFFT (Inverse Fast Fourier Transform) block for generating the OFDM symbol by IFFT-transforming the replica data.
A reception apparatus for receiving a signal in a mobile communication system, which modulates input data with a specific size into an OFDM (Orthogonal Frequency Division Multiplexing) symbol before transmission, the apparatus comprising:
- an FFT (Fast Fourier Transform) block for generating the OFDM symbol by FFT-transforming the received signal;
- a controller for (a) determining whether the OFDM symbol is retransmission data, (b) if the OFDM symbol is retransmission data, determining whether the retransmission data is replica data, and (c) if the retransmission data is replica data, modulating the replica data by a frequency diversity technique;
- and
- a frequency diversity combiner for modulating the input data by inversely cyclically-circulating the replica data under control of the controller.
A transmission method in a mobile communication system, which modulates input data with a specific size into an OFDM (Orthogonal Frequency Division Multiplexing) symbol before transmission, the method comprising the steps of:
- (a) determining whether to transmit replica data instead of the input data, if the input data is retransmission data;
- (b) generating the replica data by cyclically-circulating the input data after the determination;
- and
- (c) generating the OFDM symbol by IFFT (Inverse Fast Fourier Transform)-transforming the replica data.
A reception method for receiving a signal in a mobile communication system, which modulates input data with a specific size into an OFDM (Orthogonal Frequency Division Multiplexing) symbol before transmission, the method comprising the steps of:
- generating the OFDM symbol by FFT (Fast Fourier Transform)-transforming the received signal;
- determining whether the OFDM symbol is retransmission data;
- if the OFDM symbol is retransmission data, determining whether the retransmission data is replica data;
- if the transmission data is replica data, modulating the replica data by a frequency diversity technique;
- and
- modulating the input data by inversely cyclically-circulating the replica data according to the frequency diversity technique.
Dependencies are inferred from the claim text.