Apparatus for transmitting and receiving signal using orthogonal codes and non-binary values in CDMA/OFDM system and method thereof
First Claim
1. A transmitting apparatus of Code Division Multiple Access/Orthogonal Frequency Division Muliplexing (CDMA/OFDM) comprising:
- first serial/parallel converting means for performing serial-to-parallel conversion for received external data to be transmitted;
mapping means for generating non-binary signals from parallel data converted at the first serial/parallel converting means;
temporally orthogonal coding (TOC) means for converting the non-binary signals generated at the mapping means to data having orthogonality;
unique spreading code synthesizing means for spreading the data having orthogonality converted at the temporally orthogonal coding means by multiplying with a unique spreading code;
second serial/parallel converting means for performing serial-to-parallel conversion for the data spread at the unique spreading code synthesizing means;
complex Inverse Fast Fourier Transform (IFFT) means for performing IFFT for parallel data converted at the second serial/parallel converting means;
parallel/serial converting and guard interval inserting means for performing serial-to-parallel conversion and inserting guard interval for the data IFFTed at the complex IFFT means;
modulating means for modulating the data received from the parallel/serial converting and guard interval inserting means multiplying with a Radio Frequency (RF); and
synthesizing means for synthesizing the data modulated at the modulating means to transmit to the air.
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Accused Products
Abstract
An apparatus for transmitting and receiving a signal in Code Division Multiple Access/Orthogonal Frequency Division Multiplexing (CDMA/OFDM) system is provided. The apparatus discriminates user signals with a unique spreading code and the orthogonal codes, increases data transmission rate with the non-binary value without increasing of entire bandwidth used by the users, solves signal interference with interleaver and diversity effect of interleaving and OFDM, and maximizes transmission efficiency by varying modulation schemes depending on channel states.
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Citations
21 Claims
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1. A transmitting apparatus of Code Division Multiple Access/Orthogonal Frequency Division Muliplexing (CDMA/OFDM) comprising:
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first serial/parallel converting means for performing serial-to-parallel conversion for received external data to be transmitted;
mapping means for generating non-binary signals from parallel data converted at the first serial/parallel converting means;
temporally orthogonal coding (TOC) means for converting the non-binary signals generated at the mapping means to data having orthogonality;
unique spreading code synthesizing means for spreading the data having orthogonality converted at the temporally orthogonal coding means by multiplying with a unique spreading code;
second serial/parallel converting means for performing serial-to-parallel conversion for the data spread at the unique spreading code synthesizing means;
complex Inverse Fast Fourier Transform (IFFT) means for performing IFFT for parallel data converted at the second serial/parallel converting means;
parallel/serial converting and guard interval inserting means for performing serial-to-parallel conversion and inserting guard interval for the data IFFTed at the complex IFFT means;
modulating means for modulating the data received from the parallel/serial converting and guard interval inserting means multiplying with a Radio Frequency (RF); and
synthesizing means for synthesizing the data modulated at the modulating means to transmit to the air. - View Dependent Claims (2, 3, 4, 5)
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6. A receiving apparatus of Code Division Multiple Access/Orthogonal Frequency Division Muliplexing (CDMA/OFDM) comprising:
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demodulating means for demodulating a signal transmitted from a transmitting apparatus by multiplying with an external RF;
low pass filtering means for passing low frequency component of the analog signal demodulated at the demodulating means;
analog/digital converting and guard interval inserting discarding means for converting the analog signal filtered by the low pass filtering means to digital data and discarding the guard interval from the converted digital data;
complex Fast Fourier Transform (FFT) means for performing complex FFT for the output data of the analog/digital converting and guard interval inserting discarding means;
first parallel/serial converting means for converting the parallel data from the complex FFT means to serial data;
unique spreading code synthesizing means for de-spreading the serial data converted at the first parallel/serial converting means by multiplying with a unique spreading code;
de-temporally orthogonal coding (de-TOC) means for converting the orthogonal data from the unique spreading code synthesizing means to non-binary signals having no orthogonality;
de-mapping means for recovering binary data from the non-binary signals from the de-temporally orthogonal coding means; and
serial/parallel converting means for performing serial/parallel conversion for the data recovered by the de-mapping means. - View Dependent Claims (7, 8)
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9. A transmitting method for use in a transmitting apparatus of Code Division Multiple Access/Orthogonal Frequency Division Muliplexing (CDMA/OFDM) comprising the steps of:
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(a) at first serial/parallel converting means, performing serial-to-parallel conversion for external data to be transmitted and, at mapping means, generating non-binary signals from the converted parallel data;
(b) at temporally orthogonal coding (TOC) means, converting the generated non-binary signal to data having orthogonality;
(c) at unique spreading code synthesizing means, spreading the converted orthogonal data by multiplying with a unique spreading code and, at second serial/parallel converting means, performing serial-to-parallel conversion for the spread data;
(d) at complex Inverse Fast Fourier Transform (IFFT) means, performing IFFT for the parallel data converted at the step (c);
(e) at parallel/serial converting and guard interval inserting means, performing serial-to-parallel conversion for the IFFTed data and inserting guard interval; and
(f) at modulating means, modulating the guard interval inserted data by multiplying with an external RF and, at synthesizing means, synthesizing the modulated data to transmit to the air. - View Dependent Claims (10, 11, 12, 13)
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14. A receiving method for use in a receiving apparatus of Code Division Multiple Access/Orthogonal Frequency Division Multiplexing (CDMA/OFDM) comprising the steps of:
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(a) at demodulating means, demodulating a signal transmitted from a transmitting apparatus by multiplying with an external RF and, at low pass filtering means, passing low frequency component of the demodulated analog signal;
(b) at analog/digital converting and guard interval inserting discarding means, converting the analog signal filtered in the step (a) by the low pass filtering means to digital data and discarding the guard interval from the converted digital data;
(c) at complex FFT means, performing complex FFT for the output data of the analog/digital converting and guard interval inserting discarding means;
(d) at first parallel/serial converting means, converting the parallel data from the complex FFT means to serial data and, at unique spreading code synthesizing means, de-spreading the serial data converted at the first parallel/serial converting means by multiplying with a unique spreading code;
(e) at de-temporally orthogonal coding (de-TOC) means, converting the orthogonal data from the unique spreading code synthesizing means of the step (d) to non-binary signals having no orthogonality; and
(f) at de-mapping means, recovering binary data from the non-binary signals from the de-temporally orthogonal coding means and, at serial/parallel converting means, performing serial-to-parallel conversion for the data recovered by the de-mapping means. - View Dependent Claims (15, 16)
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17. A computer readable recording medium for recording a program for implementing, in a transmitting apparatus of CDMA/OFDM having a processor, for transmission using orthogonal code and non-binary signal value, the functions of:
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(a) at first serial/parallel converting means, performing serial-to-parallel conversion for external data to be transmitted and generating, at mapping means, non-binary signals from the converted parallel data;
(b) at temporally orthogonal coding (TOC) means, converting the generated non-binary signal to data having orthogonality;
(c) at unique spreading code synthesizing means, spreading the converted orthogonal data by multiplying with a unique spreading code and, at second serial/parallel converting means, performing serial-to-parallel conversion for the spread data;
(d) at complex IFFT means, performing IFFT for the parallel data converted in the function (c);
(e) at parallel/serial converting and guard interval inserting means, performing serial-to-parallel conversion, for the IFFTed data and inserting guard interval; and
(f) at modulating means, modulating the guard interval inserted data by multiplying with an external RF and, at synthesizing means, synthesizing the modulated data to transmit to the air. - View Dependent Claims (18, 19)
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20. A computer readable recording medium for recording a program for implementing a method for receiving a signal using orthogonal code and non-binary signal value, in a receiving apparatus of Code Division Multiple Access/Orthogonal Frequency Division Multiplexing (CDMA/OFDM) having a processor, the functions of:
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(a) at demodulating means, demodulating a signal transmitted from a transmitting apparatus by multiplying with an external RF and, at low pass filtering means, passing low frequency component of the demodulated analog signal;
(b) at analog/digital converting and guard interval inserting discarding means, converting the analog signal filtered in the function (a) by the low pass filtering means to digital data and discarding the guard interval from the converted digital data;
(c) at complex FFT means, performing complex FFT for the output data of the analog/digital converting and guard interval inserting discarding means;
(d) at first parallel/serial converting means, converting the parallel data from the complex FFT means to serial data and, at unique spreading code synthesizing means, de-spreading the serial data converted at the first parallel/serial converting means by multiplying with a unique spreading code;
(e) at de-temporally orthogonal coding (de-TOC) means, converting the orthogonal data from the unique spreading code synthesizing means of the function (d) to non-binary signals having no orthogonality; and
(f) at de-mapping means, recovering binary data from the non-binary signals from the de-temporally orthogonal coding means and, at serial/parallel converting means, performing serial/parallel conversion for the data recovered by the de-mapping means. - View Dependent Claims (21)
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Specification