Integrated circuit that transforms a symbol in a time domain into a signal in a frequency domain

• US 9,775,155 B2
• Filed: 10/28/2016
• Issued: 09/26/2017
• Est. Priority Date: 09/22/2008
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Takaoka, Shinsuke, Hoshino, Masayuki, Miyoshi, Kenichi
• Primary Examiner(s): GHOWRWAL, OMAR J
• Application Number:
  US15/337,985
• Publication Number:
  US 20170048867A1
• Time in Patent Office: 333 Days
• CPC Class Codes: G06F 17/141 Discrete Fourier transforms
• CPC Class Codes: H04J 1/00 Frequency-division multiplex systems H04J14/00 takes precedence
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 4/005 Transmultiplexing
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/0041 Frequency-non-contiguous
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y10S 370/916 Multiplexer/demultiplexer

Abstract

A communication apparatus includes a receiver, a combiner, and a transformer. The receiver receives signals mapped on plural frequency bands. A size of at least one of the frequency bands is a multiple of a product of two or more powers of prime numbers, which are integer numbers greater than 1 and are different from each other. An exponent for at least one of the prime numbers is an integer greater than 1. The combiner combines the received signals into a combined signal. The transformer transforms the combined signal in a frequency domain into a symbol sequence in a time domain with an inverse discrete Fourier transform (IDFT) having a size that is a product of powers of plural values. The values are integer numbers greater than 1 and are different from each other. An exponent for at least one of the values is an integer greater than 1.

Claims

1. An integrated circuit comprising:

circuitry which, in operation;

transforms a symbol in a time domain into a signal in a frequency domain with a DFT size that is a product of powers of a plurality of values, the plurality of values being integer numbers that are greater than 1 and are different from each other, exponents for the plurality of values being a set of non-negative integers;

maps the signal in the frequency domain on a plurality of frequency bands, each frequency band including a plurality of subcarriers, each frequency band being located at a position separate from position(s) of other(s) of the plurality of frequency bands, and a size of at least one of the plurality of frequency bands being a multiple of a product of two or more powers of prime numbers, the prime numbers being integer numbers that are greater than 1 and being different from each other, exponents for the prime numbers being a set of non-negative integers; and

generates a single carrier-frequency division multiple access (SC-FDMA) signal in the time domain from the mapped signal; and

at least one output coupled to the circuitry, which, in operation, outputs data.

2. The integrated circuit according to claim 1, wherein a number of the plurality of frequency bands is two, and a size of one of the two frequency bands is a multiple of a product of two or more powers of prime numbers.

3. The integrated circuit according to claim 1, wherein the prime numbers are selected in order from a smaller prime number.

4. The integrated circuit according to claim 1, wherein a size of all of the plurality of frequency bands is a multiple of a product of two or more powers of prime numbers.

5. The integrated circuit according to claim 1, wherein a first exponent for a first prime number is equal to or greater than a second exponent for a second prime number that is greater than the first prime number.

6. The integrated circuit according to claim 1, wherein

a size of each of the plurality of frequency bands is 1 minimum division unit or multiple minimum division units, and the minimum division unit being a product of two or more powers of prime numbers, and wherein a first exponent for a first prime number is equal to or greater than a second exponent for a second prime number that is greater than the first prime number.

7. The integrated circuit according to claim 6, wherein a size of all of the plurality of frequency bands is a multiple of the minimum division unit.