Patent ID: 7522674
Filing Date: 2009-04-21
Classification: H04B,H04L

Abstract:
1. A wireless communications method, comprising: transmitting a time synchronization signal on at least one of multiple antennas; and transmitting on each of the multiple antennas a respective, linearly-independent and orthogonal component of a channel characterization signal, wherein the channel characterization signal components consist of channel symbols, the channel symbols for each component having shared carrier tones with amplitudes that provide an orthogonal relationship between neighboring carrier tones of different components and wherein a sum of the channel characterization signal component powers approximates a channel characterization signal component powers for a single antenna device; and after transmitting the channel characterization signal components, transmitting on each of the multiple antennas a respective orthogonal component of a packet header signal, wherein a sum of orthogonal packet header component powers approximates a packet header signal power for the single antenna device, wherein the orthogonal relationship is  wherein A wherein S