Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compressed Sensing Channel Estimation for OTFS Modulation in Non-Integer
  Delay-Doppler Domain   This paper introduces a Compressed Sensing (CS) estimation scheme for
Orthogonal Time Frequency Space (OTFS) channels with sparse multipath. The OTFS
waveform represents signals in a two dimensional Delay-Doppler (DD) orthonormal
basis. The proposed model does not require the assumption that the delays are
integer multiples of the sampling period. The analysis shows that non-integer
delay and Doppler shifts in the channel cannot be accurately modelled by
integer approximations. An Orthogonal Matching Pursuit with Binary-division
Refinement (OMPBR) estimation algorithm is proposed. The proposed estimator
finds the best channel approximation over a continuous DD dictionary without
integer approximations. This results in a significant reduction of the
estimation normalized mean squared error with reasonable computational
complexity.

37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex