-
公开(公告)号：JPH11186989A
公开(公告)日：1999-07-09
申请号：JP28158098
申请日：1998-10-02
Applicant: KOREA ELECTRONICS TELECOMM
Inventor： BANG SEUNG CHANG , SHIM JAE RYONG , HAN KI CHUL , KIM JUNG IM , KIM TAE JOONG
Abstract: PROBLEM TO BE SOLVED: To provide an orthogonal complex spreading method and its system for a multiplex channel by which a problem of unbalanced power between in-phase channels and orthogonal phase channels is solved, and which has an advantage over complex spreading systems proposed by CDMA-ONE in the U.S. and by W-CDMA in Japan and Europe, from the standpoint of power efficiency. SOLUTION: 'Orthogonal complex spread miodulation' is called an OCQPSK (orthogonal complex QPSK). Data for a multiplex channel and subject to gain and orthogonal Hadamard sequence for each channel, two channel data multiplied with the gain and the orthogonal Hadamard sequence are summed in a complex form, a complex multiplier applies complex multiplication to the value summed in the complex form and the outer orthogonal Hadamard sequence in a complex form, and provides outputs of in-phase information and orthogonal phase information. The in- phase information outputted from lots of blocks is summed to the in-phase information and the orthogonal phase information is summed to the orthogonal phase information, and the result is spread by using a spread code in the orthogonal complex spread method for the multiplex channel.
-
公开(公告)号：DE69840883D1
公开(公告)日：2009-07-16
申请号：DE69840883
申请日：1998-10-02
Applicant: KOREA ELECTRONICS TELECOMM
Inventor： SHIM JAE RYONG , HAN KI CHUL , BANG SEUNG CHANG , KIM JUNG IM , KIM TAE JOONG
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：HK1108982A1
公开(公告)日：2008-05-23
申请号：HK08101487
申请日：2008-02-06
Applicant: KOREA ELECTRONICS TELECOMM
Inventor： BANG SEUNG CHANG , HAN KI CHUL , SHIM JAE RYONG , KIM JUNG IM , KIM TAE JOONG
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：FR2788393A1
公开(公告)日：2000-07-13
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
Abstract: The common channel direct access code division multiplexed access system has multiple terminals (100) transmitting digital words to a base post (200) using a communications channel. The base post receives digital word signals with front end codes, which are not address related, being selected by each of the multiple terminals. The base post searches all possible front end codes, to acquire the signal. If the base post acquires the front end code the terminal transmits the digital words, otherwise re transmitting the front end code.
-
公开(公告)号：HK1108981A1
公开(公告)日：2008-05-23
申请号：HK08101486
申请日：2008-02-06
Applicant: KOREA ELECTRONICS TELECOMM
Inventor： BANG SEUNG CHANG , HAN KI CHUL , SHIM JAE RYONG , KIM JUNG IM , KIM TAE JOONG
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.
-
Patent Agency Ranking
公开(公告)号：HK1108236A1
公开(公告)日：2008-05-02
申请号：HK08101565
申请日：2008-02-13
Applicant: KOREA ELECTRONICS TELECOMM
Inventor： BANG SEUNG CHANG , HAN KI CHUL , SHIM JAE RYONG , KIM JUNG IM , KIM TAE JOONG
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：DE69838242D1
公开(公告)日：2007-09-27
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
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
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
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
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.
-
-
-
-
-
-
-
-
-
Search Results
18
records
(took 0.087 seconds)
