Invention Grant
- Patent Title: Differential multiple-length transmit and reception diversity
- Patent Title (中): 差分多长度发射和接收分集
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Application No.: US10545588Application Date: 2003-02-13
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Publication No.: US07649953B2Publication Date: 2010-01-19
- Inventor: Gerhard Bauch
- Applicant: Gerhard Bauch
- Applicant Address: JP Tokyo
- Assignee: NTT DoCoMo, Inc.
- Current Assignee: NTT DoCoMo, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Nutter McClelnnen & Fish LLP
- Agent John J. Penny, Jr.
- International Application: PCT/EP03/01439 WO 20030213
- International Announcement: WO2004/073247 WO 20040826
- Main IPC: H04B7/02
- IPC: H04B7/02
Abstract:
The present invention achieves differential transmit diversity and related diversity reception schemes transmit symbol constellations which are extended to multiple levels. Heretofore, a group of transmission bits is divided into a first sub-group of transmission bits and a second sub-group of transmission bits. Then, the first sub-group of transmission bits is mapped (14) onto constellation points of a differential transmit diversity coding scheme from an orthogonal design for coding of the first sub-group of transmission bits. Then, after differential encoding of the constellation points (32, 34, 36, 40) a length of the transmission symbol vector is scaled (38) for coding the second sub-group of transmission bits. Therefore, the present invention overcomes restrictions implied through unit length requirements for previously known differential transmit diversity schemes from orthogonal designs.
Public/Granted literature
- US20060274846A1 Differential multiple-length transmit and reception diversity Public/Granted day:2006-12-07
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