H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/12 (2006.01) H04B 7/06 (2006.01) H04J 11/00 (2006.01) H04L 1/06 (2006.01) H04L 27/26 (2006.01)
Patent
CA 2341808
Wireless communications for frequency-selective fading channels is realized by employing a system including orthogonal frequency division multiplexing (OFDM) in combination with an at least two antenna transmit diversity arrangement. Specifically, OFDM converts a multipath channel into a plurality of narrowband subchannels each having flat. fading. Then, the signals on the same frequency subchannels of the at least two antennas are grouped together. Considering a first frequency subchannel, during a first OFDM time interval, a first signal and a second signal are transmitted on the first frequency subchannel from a first antenna (0) and from a second antenna (1), respectively. During a second OFDM time interval, a reverse sign (-) complex conjugate of the second signal and a complex conjugate of the first signal are transmitted from the first antenna and the second antenna, respectively. In a specific embodiment of the invention, reduced complexity in the implementation is realized by a reverse order complex conjugate and a reverse order, reverse sign (-) complex conjugate and judicious selection of the processed data signals in order to transmit the appropriate ones of the signals during the first and second OFDM intervals. Again, if the channel remains constant over the two OFDM intervals, diversity combination is realized for each frequency subchannel. In another embodiment of the invention, antenna-group hopping is employed in conjunction with pairing in time of the OFDM frequency subchannel signals to realize increased transmit diversity without rate loss.
Li Xiaodong
Papadias Constantinos B.
Viswanathan Harish
Kirby Eades Gale Baker
Lucent Technologies Inc.
LandOfFree
Orthogonal frequency division multiplexing transmit... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Orthogonal frequency division multiplexing transmit..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthogonal frequency division multiplexing transmit... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1521959