  The use of low resolution Analog to Digital Converters (ADCs) can
significantly reduce the power consumption for massive Multiple Input Multiple
Output (MIMO) systems. The existing literature on quantized massive MIMO
systems deals with Cyclic Prefix (CP) transmission schemes in
frequency-selective fading channels. In this paper, we propose a block
processing Frequency Domain Equalization (FDE) technique in CP-free
transmission schemes for massive MIMO systems having low resolution ADCs. The
optimal block length for FDE is found by minimizing a computational complexity
cost function and taking quantization distortion, channel impulse response and
the number of transmit and receiver antennas into account. Through numerical
simulation, it is shown that the optimal block length also guarantees good
performance in terms of the Mean Square Error (MSE) and Bit Error-Rate (BER)
criterion.
