Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient Non-linear Equalization for 1-bit Quantized Cyclic Prefix-Free
  Massive MIMO Systems   This paper addresses the problem of data detection for a massive
Multiple-Input-Multiple-Output (MIMO) base station which utilizes 1-bit
Analog-to-Digital Converters (ADCs) for quantizing the uplink signal. The
existing literature on quantized massive MIMO systems deals with Cyclic Prefix
(CP) transmission over frequency-selective channels. In this paper, we propose
a computationally efficient block processing equalizer based on the Expectation
Maximization (EM) algorithm in CP-free transmission for 1-bit quantized
systems. We investigate the optimal block length and overlapping factor in
relation to the Channel Impulse Response (CIR) length based on the Bit
Error-Rate (BER) performance metric. As EM is a non-linear algorithm, the
optimal estimate is found iteratively depending on the initial starting point
of the algorithm. Through numerical simulations we show that initializing the
EM-algorithm with a Wiener-Filter (WF) estimate, which takes the underlying
quantization into account, achieves superior BER-performance compared to
initialization with other starting points.

21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol