Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Delayed Channel State Information: Incremental Redundancy with Backtrack
  Retransmission   In many practical wireless systems, the Signal-to-Interference-and-Noise
Ratio (SINR) that is applicable to a certain transmission, referred to as
Channel State Information (CSI), can only be learned after the transmission has
taken place and is thereby outdated (delayed). For example, this occurs under
intermittent interference. We devise the backward retransmission (BRQ) scheme,
which uses the delayed CSIT to send the optimal amount of incremental
redundancy (IR). BRQ uses fixed-length packets, fixed-rate R transmission
codebook, and operates as Markov block coding, where the correlation between
the adjacent packets depends on the amount of IR parity bits. When the delayed
CSIT is full and R grows asymptotically, the average throughput of BRQ becomes
equal to the value achieved with prior CSIT and a fixed-power transmitter;
however, at the expense of increased delay. The second contribution is a method
for employing BRQ when a limited number of feedback bits is available to report
the delayed CSIT. The main novelty is the idea to assemble multiple feedback
opportunities and report multiple SINRs through vector quantization. This
challenges the conventional wisdom in ARQ protocols where feedback bits are
used to only quantize the CSIT of the immediate previous transmission.

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The categories of this paper are: stat
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: adap-org