| US 7,548,506 B2 | ||
| System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design | ||
| Jianglei Ma, Kanata (Canada); Ming Jia, Ottawa (Canada); Peiying Zhu, Kanata (Canada); and Wen Tong, Ottawa (Canada) | ||
| Assigned to Nortel Networks Limited, St. Laurent, Quebec (Canada) | ||
| Filed on Jan. 08, 2002, as Appl. No. 10/38,915. | ||
| Claims priority of provisional application 60/329507, filed on Oct. 17, 2001. | ||
| Claims priority of provisional application 60/329510, filed on Oct. 17, 2001. | ||
| Claims priority of provisional application 60/329514, filed on Oct. 17, 2001. | ||
| Prior Publication US 2003/0072255 A1, Apr. 17, 2003 | ||
| Int. Cl. H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—208 [370/324; 370/511] | 20 Claims |
| 1. A MIMO-OFDM transmitter configured to transmit a header symbol format in which sub-carriers of a header OFDM symbol are
divided into a non-contiguous set of sub-carriers for each of a plurality of antennas, with each antenna transmitting the
header OFDM symbol only on the respective set of sub-carriers;
wherein the header symbol contains a frequency multiplexed dedicated pilot channel on dedicated pilot channel sub-carriers
and common synchronization channel on common synchronization channel sub-carriers for each of the plurality of antennas;
wherein the common synchronization channel is used to transmit a complex sequence which is different for each transmit antenna
of one transmitter, but which is common for respective transmit antennas of each transmitter within a communications network.
|