Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pilot Optimization and Power Allocation for OFDM-based Full-duplex Relay
  Networks with IQ-imbalances   In OFDM relay networks with IQ imbalances and full-duplex relay station (RS),
how to optimize pilot pattern and power allocation using the criterion of
minimizing the sum of mean square errors (Sum-MSE) for the frequency-domain
least-squares channel estimator has a heavy impact on self-interference
cancellation. Firstly, the design problem of pilot pattern is casted as a
convex optimization. From the KKT conditions, the optimal analytical expression
is derived given the fixed source power and RS power. Subsequently, an optimal
power allocation (OPA) strategy is proposed and presented to further alleviate
the effect of Sum-MSE under the total transmit power sum constraint of source
node and RS. Simulation results show that the proposed OPA performs better than
equal power allocation (EPA) in terms of Sum-MSE, and the Sum-MSE performance
gain grows with deviating $\rho$ from the value of $\rho^o$ minimizing the
Sum-MSE, where $\rho$ is defined as the average ratio of the residual SI
channel at RS to the intended channel from source to RS. For example, the OPA
achieves about 5dB SNR gain over EPA by shrinking or stretching $\rho$ with a
factor $4$. More importantly, as $\rho$ decreases or increases more, the
performance gain becomes more significant.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
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The categories of this paper are: econ
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th