TW200721756A - Methods and apparatus for circulation transmissions for OFDM-based MIMO systems - Google Patents
Methods and apparatus for circulation transmissions for OFDM-based MIMO systemsInfo
- Publication number
- TW200721756A TW200721756A TW095136751A TW95136751A TW200721756A TW 200721756 A TW200721756 A TW 200721756A TW 095136751 A TW095136751 A TW 095136751A TW 95136751 A TW95136751 A TW 95136751A TW 200721756 A TW200721756 A TW 200721756A
- Authority
- TW
- Taiwan
- Prior art keywords
- ofdm
- ofdm symbols
- symbol
- antennas
- circulation
- Prior art date
Links
Landscapes
- Radio Transmission System (AREA)
Abstract
System performance in wireless communication is improved by increasing diversity in time, space and frequency. In an OFDM-based MIMO system, each antenna can be used to transmit one OFDM symbol at a time. When the number of antennas M is greater than the number of simultaneously transmitted OFDM symbols N, circulation transmissions according to the present invention improve signal diversity. Circulation transmission can be either symbol-based or sub-carrier based. In symbol-based circulation transmission, N antennas are chosen, based on a circular pattern, from the M available antennas to simultaneously transmit the N OFDM symbols, with one antenna transmitting an OFDM symbol. In subcarrier-based circulation transmission, again N OFDM symbols are processed at a time. Now each subcarrier within each of the N OFDM symbols is individually re-mapped, based on a circular pattern, to create M OFDM symbols. These M re-mapped OFDM symbols are then transmitted from the M antennas simultaneously, with one antenna transmitting one remapped OFDM symbol.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/244,607 US7593472B2 (en) | 2004-10-22 | 2005-10-06 | Methods and apparatus for circulation transmissions for OFDM-based MIMO systems |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200721756A true TW200721756A (en) | 2007-06-01 |
TWI324002B TWI324002B (en) | 2010-04-21 |
Family
ID=38907095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW95136751A TWI324002B (en) | 2005-10-06 | 2006-10-03 | Methods and apparatus for circulation transmissions for ofdm-based mimo systems |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN101079861B (en) |
TW (1) | TWI324002B (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100526510B1 (en) * | 2002-09-30 | 2005-11-08 | 삼성전자주식회사 | Signal transmitting/receiving apparatus and method over multiple antennas in a mobile communication system |
US7002900B2 (en) * | 2002-10-25 | 2006-02-21 | Qualcomm Incorporated | Transmit diversity processing for a multi-antenna communication system |
KR100552680B1 (en) * | 2003-02-17 | 2006-02-20 | 삼성전자주식회사 | PAPR reduction method for multiple antenna OFDM communication systems and multiple antenna OFDM communication systems using the same method |
-
2006
- 2006-10-03 TW TW95136751A patent/TWI324002B/en active
- 2006-10-08 CN CN2006101404332A patent/CN101079861B/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN101079861B (en) | 2012-02-08 |
TWI324002B (en) | 2010-04-21 |
CN101079861A (en) | 2007-11-28 |
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