Efficient channel estimation using golay sequences

Patent metadata

Field	Value
Publication number	US-2016308594-A1
Application number	US-201615057956-A
Country	US
Kind code	A1
Filing date	Mar 1, 2016
Priority date	Apr 17, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

Certain aspects of the present disclosure provide an apparatus for wireless communication. The apparatus may generally include a processing system configured to generate a frame comprising a first sequence and a conjugate of the first sequence; and an interface configured to output the frame for transmission to a wireless node, wherein the first sequence and the conjugate of the first known sequence are simultaneously transmitted via first and second transmit chains. The first sequence maybe known by the wireless node prior to the transmission.

First claim

What is claimed is:

1 . An apparatus for wireless communication, comprising:
a processing system configured to generate a frame comprising a first sequence and a conjugate of the first sequence; and an interface configured to output the frame for transmission to a wireless node, wherein the first sequence and the conjugate of the first sequence are simultaneously transmitted via first and second transmit chains, wherein the first sequence is known by the wireless node prior to the transmission.

2 . (canceled)

3 . The apparatus of claim 1 , wherein:
the first sequence is generated based on a first linear combination of an original sequence and a conjugate of the original sequence; and the conjugate of the first sequence is generated based on a second linear combination of the original sequence and the conjugate of the original sequence.

4 - 6 . (canceled)

7 . The apparatus of claim 1 , wherein:
the frame further comprises a second sequence and a conjugate of the second sequence; and the interface is configured to output the frame for transmission, wherein the second sequence and the conjugate of the second sequence are simultaneously transmitted via third and fourth transmit chains, wherein the second sequence is known by the wireless node prior to the transmission of the second sequence.

8 . (canceled)

9 . The apparatus of claim 7 , wherein simultaneous transmission of the second sequence and the conjugate of the second sequence via the third and fourth transmit chains at least partially overlaps with simultaneous transmission of the first sequence and the conjugate of the first sequence via the first and second transmit chains.

10 . The apparatus of claim 7 , wherein the second sequence and the conjugate of the second sequence are simultaneously transmitted via the third and fourth transmit chains a time period after the first sequence and the conjugate of the first sequence were simultaneously transmitted via the first and second transmit chains.

11 . The apparatus of claim 7 , wherein:
the frame further comprises at least one of a repetition of the first sequence, a repetition of the conjugate of the first sequence, a repetition of the second sequence, or a repetition of the conjugate of the second sequence; and the interface is configured to output the frame for transmission, wherein each of the repetitions of the first sequence, the second sequence, the conjugate of the first sequence, and the conjugate of the second sequence is transmitted later in time and using a different transmit chain than a previous transmission of the first sequence, the second sequence, the conjugate of the first sequence, and the conjugate of the second sequence.

12 - 15 . (canceled)

16 . An apparatus for wireless communication, comprising:
an interface configured to obtain, from a wireless node, a frame comprising a first sequence and a conjugate of the first sequence simultaneously received via first and second receive chains, wherein the first sequence is known by the apparatus prior to obtaining the frame; and a processing system configured to generate a first signal estimate based on the first sequence as received via the first receive chain, generate a second signal estimate based on the conjugate of the first sequence as received via the first receive chain, generate a third signal estimate based on the first sequence as received via the second receive chain, and generate a fourth signal estimate based on the conjugate of the first sequence as received via the second receive chain, and to generate a multiple input multiple output (MIMO) signal estimate based on the first signal estimate, the second signal estimate, the third signal estimate, and the fourth signal estimate.

17 . The apparatus of claim 16 , wherein the first sequence comprises a channel estimation sequence (CES), and wherein the first, second, third, and fourth signal estimates comprise a channel estimate.

18 . (canceled)

19 . The apparatus of claim 16 , wherein:
the frame further comprises a second sequence and a conjugate of the second sequence simultaneously received at the first and second receive chains at a time period after reception of the first sequence and the conjugate of the first sequence, wherein the second sequence in the frame is known by the apparatus prior to obtaining the frame; and the processing system is further configured to generate a fifth signal estimate based on the second sequence as received via the first receive chain, generate a sixth signal estimate based on the conjugate of the second sequence as received via the first receive chain, generate a seventh signal estimate based on the second sequence as received via the second receive chain, and generate an eighth signal estimate based on the conjugate of the second sequence as received via the second receive chain.

20 . (canceled)

21 . The apparatus of claim 16 , wherein:
the processing system further comprises a first correlator configured to generate the first and second signal estimates, the first correlator having in-phase and quadrature-phase inputs, and the processing system is configured to generate the second signal estimate by:
conjugating an input signal to the first correlator, or
routing an in-phase signal of the conjugate of the first sequence to the quadrature-phase input of the first correlator and routing a quadrature-phase signal of the conjugate of the first sequence to the in-phase input of the first correlator.

22 . The apparatus of claim 19 , wherein:
the processing system is further configured to generate the MIMO signal estimate based on the first sequence as received at a third receive chain, the conjugate of the first sequence as received at the third receive chain, the first sequence as received at a fourth receive chain, and the conjugate of the first sequence as received at the fourth receive chain, the second sequence as received at the third receive chain, the conjugate of the second sequence as received at the third receive chain, the second sequence as received at the fourth receive chain, and the conjugate of the second sequence as received at the fourth receive chain.

23 . (canceled)

24 . The apparatus of claim 19 , wherein:
the frame further comprises at least one of a repetition of the first sequence, a repetition of the conjugate of the first sequence, a repetition of the second sequence, or a repetition of the conjugate of the second sequence; and the processing system is further configured to generate the MIMO signal estimate based on at least one of the repetition of the first sequence, the repetition of the conjugate of the first sequence, the repetition of the second sequence, or the repetition of the conjugate of the second sequence, as received at the first and second receive chains.

25 . (canceled)

26 . The apparatus of claim 24 , wherein:
the processing system is further configured to generate the MIMO signal estimate based on at least one of the repetition of the first sequence, the repetition of the conjugate of the first sequence, the repetition of the second sequence, or the repetition of the conjugate of the second sequence, as received at third and fourth receive antennas.

27 . The apparatus of claim 24 , wherein:
each of the repetition of the first sequence, the repetition of the conjugate of the first sequence, the repetition of the second sequence, and the repetition of the conjugate of the second sequence is generated based on a

Assignees

• Qualcomm Inc

Inventors

• Sanderovich Amichai

Classifications

• H04B7/0613

  using simultaneous transmission (H04B7/0686 takes precedence) · CPC title

• H04B7/0684

  using different training sequences per antenna · CPC title

• H04L25/0204 Primary

  of multiple channels · CPC title

• H04J13/0014

  Golay · CPC title

• H04L25/0224

  using sounding signals · CPC title