Patent ID: 8837652
Filing Date: 2014-09-16
Classification: H04L

Abstract:
1. A method for use by a transmitting device having a plurality of transmitters in communication with a receiving device having a plurality of receivers, the method comprising: dividing, by the transmitting device, a plurality of radio frequency tones into a plurality of distinct subsets of tones; assigning, by the transmitting device, a particular subset of the plurality of distinct subsets of tones to each respective transmitter of the plurality of transmitters for each symbol in an orthogonal acquisition sequence having a plurality of symbols for the plurality of radio frequency tones; generating, by the transmitting device, a respective orthogonal acquisition sequence for each transmitter of the plurality of transmitters, the generating further comprising setting tones that are not part of the assigned particular subset of tones for each respective transmitter of the plurality of transmitters to zero for each symbol of the respective orthogonal acquisition sequence of that transmitter; and simultaneously transmitting the generated orthogonal acquisition sequences on the assigned particular subsets from the plurality of transmitters, respectively; wherein the plurality of transmitters comprises N transmitters, and wherein the tones within each respective particular subset of the plurality of distinct subsets of tones are separated by N−1 tones, wherein N=2, and wherein the plurality of distinct subsets of tones are odd tones and even tones; and the receiving device having a received signal originating from the transmitter device and is configured to perform filtering, the filtering comprising: delaying the received signal for ½ the length of a symbol to produce a delayed signal; subtracting the received signal from the delayed signal to filter for the symbols transmitted on only the odd tones; and adding the received signal to the delayed signal to filter for the symbols transmitted on only the even tones.