High efficiency long training field symbol transmission for multiple transmission streams

A method for transmitting High Efficiency Long Training Field (HE-LTF) symbols to a receiver over a wireless channel, the method comprising:

• determining a portion of an LTF mapping matrix for calculating, at a receiver, a wireless channel property of the plurality of wireless channel properties based on a subset of the HE-LTF symbols mapped by the portion, wherein the portion is less than the entire LTF mapping matrix;
• assembling, based at least on the determined portion of the LTF mapping matrix, the HE-LTF symbols mapped by the LTF mapping matrix;
• and
• transmitting the HE-LTF symbols corresponding to the LTF mapping matrix for determining a plurality of wireless channel properties of the wireless channel over which the HE-LTF symbols are transmitted by a transmitter.

A system for channel estimation based on High Efficiency Long Training Field (HE-LTF) symbols transmitted to a receiver over a wireless channel by a transmitter over a plurality of tones, the system comprising:

• control circuitry coupled to the transmitter, the control circuitry configured to:
• assign, based on a modulo operation applied to tone indices corresponding to the plurality of tones, a plurality of wireless spatial streams to the plurality of tones, wherein a subset of the plurality of tones is separated by one or more tones unassigned to the subset of the plurality of tones;
• and
• generate, based on the assigned plurality of wireless spatial streams, the HE-LTF symbols for estimating, at the receiver, the wireless channel having bandwidth coherency within the plurality of tones;
• and
• the transmitter configured to transmit, over the plurality of tones, the generated HE-LTF symbols for interpolation of a channel estimate matrix corresponding to the one or more tones unassigned to the subset of the unassigned tones.