Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A low-complexity 2D signal space diversity solution for future
  broadcasting systems   -DVB-T2 was the first industrial standard deploying rotated and cyclic Q
delayed (RCQD)modulation to improve performance over fading channels. This
enablesimportantgains compared toconventional quadrature amplitude
modulations(QAM) under severe channel conditions.However, the corresponding
demodulation complexitystill prevents its use forwider applications. This paper
proposes several rotation angles for different QAM constellations anda
corresponding low-complexity detection method. Results show that the proposed
solution simplifies both the transmitter and the receiver with often
betterperformancethan the proposed angles in DVB-T2. Compared with the lowest
complexity demappers currently used in DVB-T2, the proposed solution achieves
an additional reduction bymore than 60%. Index Terms- DVB-T2, Rotated and
Cyclic Q Delayed (RCQD) Modulations, Signal Space Diversity (SSD), Fading
Channel, Quadrature Amplitude Modulations (QAM), Max-Log,
ComputationalComplexity.

37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an