公开(公告)号：HK1108237A1

公开(公告)日：2008-05-02

申请号：HK08101591

申请日：2008-02-13

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： SHIM JAE RYONG ,  HAN KI CHUL ,  BANG SEUNG CHANG ,  KIM JUNG IM ,  KIM TAE JOONG

IPC: H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10

Abstract: An orthogonal complex spreading method for multiple data inputs, each of the data inputs being allocated to either a first group or a second group, comprising steps of: generating first outputs (600) by multiplying each of data inputs in the first group (X 11 ... X n1 ) by a corresponding orthogonal sequence and a corresponding gain, respectively; generating a first output signal (810) by summing the first outputs; generating second outputs (700) by multiplying each of data inputs in the second group (X 12 ... X n2 ) by a corresponding orthogonal sequence and a corresponding gain, respectively; generating a second output signal (820) by summing the second outputs; receiving the first and second output signals in a complex form (900) and complex-multiplying the first and the second output signals by SC(OS 3 +jP-OS 4 ) (900, 300), wherein SC is a spreading code, OS 3 and OS 4 are orthogonal sequences, and P is a predetermined sequence.

公开(公告)号：DE69840900D1

公开(公告)日：2009-07-23

申请号：DE69840900

申请日：1998-10-02

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： BANG SEUNG CHANG ,  HAN KI CHUL ,  SHIM JAE RYONG ,  KIM JUNG IM ,  KIM TAE JOONG

IPC: H04J11/00 ,  H04B7/26 ,  H04J3/14 ,  H04J13/00 ,  H04J13/10

Abstract: An orthogonal complex spreading method for multiple data inputs, each of the data inputs being allocated to either a first group or a second group, comprising steps of: generating first outputs (600) by multiplying each of data inputs in the first group (X 11 ... X n1 ) by a corresponding orthogonal sequence and a corresponding gain, respectively; generating a first output signal (810) by summing the first outputs; generating second outputs (700) by multiplying each of data inputs in the second group (X 12 ... X n2 ) by a corresponding orthogonal sequence and a corresponding gain, respectively; generating a second output signal (820) by summing the second outputs; receiving the first and second output signals in a complex form (900) and complex-multiplying the first and the second output signals by SC(OS 3 +jP-OS 4 ) (900, 300), wherein SC is a spreading code, OS 3 and OS 4 are orthogonal sequences, and P is a predetermined sequence.

公开(公告)号：DE69838242T2

公开(公告)日：2008-02-14

申请号：DE69838242

申请日：1998-10-02

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： BANG SEUNG CHANG ,  HAN KI CHUL ,  SHIM JAE RYONG ,  KIM JUNG IM ,  KIM TAE JOONG

IPC: H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10

Abstract: An orthogonal complex spreading method for multiple data inputs, each of the data inputs being allocated to either a first group or a second group, comprising steps of: generating first outputs (600) by multiplying each of data inputs in the first group (X 11 ... X n1 ) by a corresponding orthogonal sequence and a corresponding gain, respectively; generating a first output signal (810) by summing the first outputs; generating second outputs (700) by multiplying each of data inputs in the second group (X 12 ... X n2 ) by a corresponding orthogonal sequence and a corresponding gain, respectively; generating a second output signal (820) by summing the second outputs; receiving the first and second output signals in a complex form (900) and complex-multiplying the first and the second output signals by SC(OS 3 +jP-OS 4 ) (900, 300), wherein SC is a spreading code, OS 3 and OS 4 are orthogonal sequences, and P is a predetermined sequence.

公开(公告)号：FR2788393B1

公开(公告)日：2007-04-06

申请号：FR9915341

申请日：1999-12-06

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM KI CHUL ,  BANG SEUNG CHAN ,  SHIM JAE RYONG ,  HAN KI CHUL

IPC: H04B7/216 ,  H04B7/005 ,  H04J13/00 ,  H04W52/24 ,  H04W52/32 ,  H04W52/50 ,  H04W76/02

Abstract: The invention relates to packet and random access in which multiple terminals (eg mobile phones) transmit data via a common code division multiple access (CDMA) Channel Terminals select one of available preamble signatures and one of available access slots and transmit a preamble (Fig.5). A base station tries to acquire the preamble and then broadcasts to all terminals whether the preambles are acquired or not (Fig.6). The terminals then transmit a data or retransmit a preamble according to the result of the preamble acquirement (Fig.5). The apparatus and method have improved network efficiency by reducing unnecessary data transmission and interference signal. An improved characteristic of time delay by ramping to adequate power level more quickly by re-transmitting preamble-by-preamble.