Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blind Estimation Algorithms for I/Q Imbalance in Direct Down-conversion
  Receivers   As known, receivers with in-phase and quadrature phase (I/Q) down conversion,
especially direct-conversion architectures, always suffer from I/Q imbalance.
I/Q imbalance is caused by amplitude and phase mismatch between I/Q paths. The
performance degradation resulting from I/Q imbalance can not be mitigated with
simply higher signal to noise ratio (SNR). Thus, I/Q imbalance compensation in
the digital domain is critical. There are two main contributions in this paper.
Firstly, we proposed a blind estimation algorithm for I/Q imbalance parameters
based on joint first and second order statistics (FSS) which has lower
complexity than conventional Gaussian maximum likelihood estimation (GMLE).
This can be used for further processing such as equalization in the presence of
receiver IQ imbalance. In addition, we find out the reason of the error floor
in conventional I/Q imbalance compensation method based on the conjugate signal
model (CSM). The proposed joint first order statistics and conjugate signal
model (FSCSM) compensation algorithm can reach the ideal bit error rate (BER)
performance.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
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
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org