Title:
OFDMAシステムにおける符合分割多重パイロットによる速い周波数ホッピング
Document Type and Number:
Japanese Patent JP5032117
Kind Code:
B2
Abstract:
Techniques are provided to support fast frequency hopping with a code division multiplexed (CDM) pilot in a multi-carrier communication system (e.g., an OFDMA system) [520]. Each transmitter (e.g., each terminal [420x]) in the system transmits a wideband pilot on all subbands to allow a receiver (e.g., a base station) to estimate the entire channel response at the same time. The wideband pilot for each transmitter [420x] may be generated using direct sequence spread spectrum processing and based on a pseudo-random number (PN) code assigned to that transmitter [420x]. This allows the receiver to individually identify and recover multiple wideband pilots transmitted concurrently by multiple transmitters. For a time division multiplexed (TDM)/CDM pilot transmission scheme, each transmitter transmits the wideband pilot in bursts. For a continuous CDM pilot transmission scheme, each transmitter [420x] continuously transmits the wideband pilot, albeit at a low transmit power level. Any frequency hopping rate may be supported without impacting pilot overhead.
Inventors:
Agrawal, Abniesh
Teague, Edward Harrison
Teague, Edward Harrison
Application Number:
JP2006532887A
Publication Date:
September 26, 2012
Filing Date:
May 07, 2004
Export Citation:
Assignee:
QUALCOMM INCORPORATED
International Classes:
H04J11/00; H04B1/7143; H04J1/00; H04L27/26; H04L5/02
Domestic Patent References:
| JP2000201134A | ||||
| JP2002111631A | ||||
| JP9233047A | ||||
| JP2000504908A |
Foreign References:
| WO2001076110A1 | ||||
| WO2003034645A1 | ||||
| WO2002003556A1 | ||||
| US20020145970 |
Attorney, Agent or Firm:
Kurata Masatoshi
Takakura Shigeo
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takakura Shigeo
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori