Frequency-division multiplexing transceiver apparatus and method
First Claim
1. A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising:
- a chip-dividing unit that divides each symbol of a transmission-symbol sequence into chips;
a first phase rotation unit that performs π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of said divided chips;
a chip-repetition and rearrangement unit that compresses the time domains of each chip of the chip sequence after phase rotation, then repeats the chips a specified number of times and rearranges the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence;
a second phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and
a transmission unit that transmits said phase-rotated chips.
1 Assignment
0 Petitions
Accused Products
Abstract
In a frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, a chip-dividing unit divides each symbol of a transmission-symbol sequence into chips; a first phase rotation unit performs π/2 phase rotation for the odd-numbered chips of the divided chips; a chip-repetition and rearrangement unit compresses the time domains of each chip of the chip sequence after phase rotation, then repeats the chips a specified number of times and rearranges the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence; a second phase rotation unit performs phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and a transmission unit transmits said phase-rotated chips.
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Citations
20 Claims
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1. A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a chip-dividing unit that divides each symbol of a transmission-symbol sequence into chips;
a first phase rotation unit that performs π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of said divided chips;
a chip-repetition and rearrangement unit that compresses the time domains of each chip of the chip sequence after phase rotation, then repeats the chips a specified number of times and rearranges the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence;
a second phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and
a transmission unit that transmits said phase-rotated chips.
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2. A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a chip-dividing unit that divides each symbol of a transmission-symbol sequence into chips;
a first phase rotation unit that performs π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of said divided chips;
a chip-repetition and rearrangement unit that compresses the time domains of each chip of the chip sequence after phase rotation, then repeats the chips a specified number of times (CRF times) and rearranges the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence;
a second phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and
a transmission unit that transmits said phase-rotated chips;
wherein said second phase rotation unit changes the amount of phase rotation performed for each chip of said repetitive-chip sequence in increments of k·
2π
/CRF (k is an integer specific to a mobile station) at each period of the repetitive-chip sequence. - View Dependent Claims (3, 4)
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5. A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a symbol-repetition and rearrangement unit that compresses the time domains of each symbol of a transmission-symbol sequence, then repeats each of the symbols a specified number of times and rearranges each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence;
a chip-dividing unit that divides the rearranged repetitive symbols into chips;
a first phase rotation unit that performs π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of the divided chip sequence;
a second phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the phase-rotated chip sequence; and
a transmission unit that transmits said phase-rotated chips.
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6. A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a symbol-repetition and rearrangement unit that compresses the time domains of each symbol of a transmission-symbol sequence, then repeats each of the symbols a specified number of times (CRF times) and rearranges each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence;
a chip-dividing unit that divides the rearranged repetitive symbols into chips;
a first phase rotation unit that performs π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of the divided chip sequence;
a second phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the phase-rotated chip sequence; and
a transmission unit that transmits said phase-rotated chips;
whereinsaid second phase rotation unit changes the amount of phase rotation performed for each chip of said repetitive-chip sequence in increments of k·
2π
/CRF (k is an integer specific to a mobile station) at each period of the repetitive-chip sequence. - View Dependent Claims (7, 8)
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9. A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a spreading-code-generation unit that generates a repeating spreading code in which the phase difference between adjacent spreading code alternates between ±
π
/2 and m·
π
/2 (m is an integer);
a spreading unit that multiplies each symbol of a transmission-symbol sequence by the spreading code;
a chip-repetition and rearrangement unit that compresses the time domains of each chip of a chip sequence obtained from said multiplication, then repeats the chips a specified number of times (CRF times) and rearranges the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence;
a phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and
a transmission unit that transmits said phase-rotated chips;
whereinsaid phase rotation unit changes the amount of phase rotation performed for each chip of said repetitive-chip sequence in increments of k·
2π
/CRF (k is an integer specific to a mobile station) at each period of the repetitive-chip sequence. - View Dependent Claims (10, 11)
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12. A frequency-division multiplexing transmission method of transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a first step of dividing each symbol of a transmission-symbol sequence into chips;
a second step of performing π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of said divided chips;
a third step of compressing the time domains of each chip of the chip sequence after phase rotation, then repeating the chips a specified number of times (CRF times) and rearranging the chips of the obtained repetitive-chip sequence so that they have the same arrangement as the original chip sequence;
a fourth step of performing phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and
a fifth step of transmitting said phase-rotated chips;
whereinthe amount of phase rotation performed for each chip of said repetitive-chip sequence changes in increments of k·
2π
/CRF (k is an integer specific to a mobile station) at each period of the repetitive-chip sequence. - View Dependent Claims (13, 14)
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15. A frequency-division multiplexing transmission method of transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a first step of compressing the time domains of each symbol of a transmission-symbol sequence, then repeating each of the symbols a specified number of times (CRF times) and rearranging each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence;
a second step of dividing the rearranged repetitive symbols into chips;
a third step of performing π
/2 or −
π
/2 phase rotation for the even-numbered or odd-numbered chips of the divided chip sequence;
a fourth step of performing phase rotation that changes at a speed specific to a mobile station for each chip of the phase-rotated chip sequence; and
a fifth step of transmitting said phase-rotated chips;
whereinthe amount of phase rotation performed for each chip of said repetitive-chip sequence changes in increments of k·
2π
/CRF (k is an integer specific to a mobile station) at each period of the repetitive-chip sequence. - View Dependent Claims (16, 17)
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18. A frequency-division multiplexing transmission method of transmitting data in a frequency spectrum specific to a mobile station, comprising:
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a first step of generating a repeating spreading code in which the phase difference between adjacent spreading code alternates between ±
π
/2 and m·
π
/2 (m is an integer);
a second step of multiplying each symbol of a transmission-symbol sequence by the spreading code;
a third step of compressing the time domains of each chip of a chip sequence obtained from said multiplication, then repeating the chips a specified number of times (CRF times) and rearranging the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence;
a fourth step of performing phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and
a fifth step of transmitting said phase-rotated chips;
whereinthe amount of phase rotation performed for each chip of said repetitive-chip sequence changes in increments of k·
2π
/CRF (k is an integer specific to a mobile station) at each period of the repetitive-chip sequence. - View Dependent Claims (19, 20)
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Specification