TRANSMISSION SYSTEM

Title:

TRANSMISSION SYSTEM

Document Type and Number:

WIPO Patent Application WO/2007/049700

Kind Code:

A1

Abstract:

In a transmission system, when information bits are transmitted from a transmitter (1) to a receiver (3), to begin with, an encoder (11) of the transmitter (1) receives and encodes the information bits, and then a modulator (12) modulates the encoded information bits to produce modulated symbols. A spreader (13) spreads the resultant modulated symbols, by use of a rotational quadrature code having a rotational angle suitable for the combination of a modulation scheme and an encoding rate, and then transmits the spread modulated symbols to a transmission channel (2). The receiver (3) performs the reverse of the operations of the transmitter (1) to decode the information bits. In a QPSK modulation in which the encoding rate of an error correction code is one-half, when the spreader (13) performs the spreading process and further when it is arranged that the rotational angle, which provides the same signal points as in OFDM, be zero, the rotational quadrature code having a rotational angle between 17 degrees and 45 degrees or between -17 degrees and -45 degrees can be used to perform the spreading process, thereby reducing bit errors and hence performing communication with high reliability.

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Inventors:

MIYAZAKI NORIAKI (JP)
SUZUKI TOSHINORI (JP)
WATANABE FUMIO (JP)

Application Number:

PCT/JP2006/321378

Publication Date:

May 03, 2007

Filing Date:

October 26, 2006

Export Citation:

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Assignee:

KDDI CORP (JP)
MIYAZAKI NORIAKI (JP)
SUZUKI TOSHINORI (JP)
WATANABE FUMIO (JP)

International Classes:

H04B1/707; H04J11/00; H04J13/12; H04J13/16; H04L27/00

Foreign References:

JP2005522061A	2005-07-21
JP2004023727A	2004-01-22

Other References:

RAULEFS R. ET AL: "Rotated spreading matrices in a coded MC-CDMA system", PROCEEDINGS OF ISSSTA2004 (2004 IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS), 30 August 2004 (2004-08-30), SYDNEY, AUSTRALIA, pages 688 - 693, XP003011947

Attorney, Agent or Firm:

AOYAMA, Masakazu et al. (Yaesu Chuo-k, Tokyo 53, JP)

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