Patent ID: 7272108
Filing Date: 2007-09-18
Classification: H04B,H04L

Abstract:
1. In a two-branch transmitter diversity wireless-communication system employing orthogonal frequency-division multiplexing, a method comprising: transmitting a long-training symbol over a first channel during a long-training period, the long-training period being compliant with the Institute of Electrical and Electronics Engineers (IEEE) “Wireless Local Area Network (LAN) Medium Access Control (MAC) and Physical Layer (PHY) Specification”; transmitting the long-training symbol over a second channel during the long-training period; transmitting a complex conjugate of the long-training symbol over the first channel during a data period; transmitting a negative complex conjugate of the long-training symbol over the second channel during the data period; receiving the long-training symbols, the complex conjugate of the long-training symbol, and the negative complex conjugate of the long-training symbol; and extracting channel characteristics from the received long-training symbols, the complex conjugate of the long-training symbol, and the negative complex conjugate of the long-training symbol.