9 research outputs found
Limited Feedback in Multiple-Antenna Systems with One-Bit Quantization
Communication systems with low-resolution analog-to-digital-converters (ADCs)
can exploit channel state information at the transmitter (CSIT) and receiver.
This paper presents initial results on codebook design and performance analysis
for limited feedback systems with one-bit ADCs. Different from the
high-resolution case, the absolute phase at the receiver is important to align
the phase of the received signals when the received signal is sliced by one-bit
ADCs. A new codebook design for the beamforming case is proposed that
separately quantizes the channel direction and the residual phase.Comment: Asilomar Conference on Signals, Systems, and Computers 201
A Reduced Complexity Ungerboeck Receiver for Quantized Wideband Massive SC-MIMO
Employing low resolution analog-to-digital converters in massive
multiple-input multiple-output (MIMO) has many advantages in terms of total
power consumption, cost and feasibility of such systems. However, such
advantages come together with significant challenges in channel estimation and
data detection due to the severe quantization noise present. In this study, we
propose a novel iterative receiver for quantized uplink single carrier MIMO
(SC-MIMO) utilizing an efficient message passing algorithm based on the
Bussgang decomposition and Ungerboeck factorization, which avoids the use of a
complex whitening filter. A reduced state sequence estimator with bidirectional
decision feedback is also derived, achieving remarkable complexity reduction
compared to the existing receivers for quantized SC-MIMO in the literature,
without any requirement on the sparsity of the transmission channel. Moreover,
the linear minimum mean-square-error (LMMSE) channel estimator for SC-MIMO
under frequency-selective channel, which do not require any cyclic-prefix
overhead, is also derived. We observe that the proposed receiver has
significant performance gains with respect to the existing receivers in the
literature under imperfect channel state information.Comment: This work has been submitted to the IEEE for possible publication.
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