Receiver Design and SER Analysis of Massive MIMO Uplink With MixedResolution ADCs This paper is on the uplink communications of singlecell multiuser massive multiinputmultioutput (MIMO) systems with a mixture of 1bit analogtodigital converters (ADCs) and fullresolution ADCs. A new lowcomplexity linear combining scheme is proposed for the receiver at the base station (BS) to take into account the difference of the two ADC types. A symbolwise decoding is derived to separately decode the information of each user and an analytical approximation is obtained for the symbol error rate (SER) of the proposed combining and decoding. Simulation results show that the proposed scheme achieves significant performance improvement compared to the traditional maximumratiocombining (MRC) receiver.

Low complexity MRC and EGC based receivers for SCFDE modulations with massive MIMO schemes Nowadays, the demand of high data wireless transfer rates is growing with the big and fast grow of smart phones. As a consequence, the spectrum is getting overloaded with communications, increasing the interference. Therefore a different path of ideas has been followed and the communication process has been taken to the next level by the usage of big arrays of antennas and multistream communication (MIMO systems) and wider bandwidths. These systems can be combined with SCFDE (SingleCarrier Frequency Domain Equalization) schemes to improve the power efficiency in uplink due to the low envelope fluctuations. In this paper we will focus on the equalization field applied in massive MIMO schemes, more specifically in the performance of new low complexity receivers that avoid matrix inversion operation. These ones are based on an IBDFE (Iterative Block Decision Feedback Equalizer) but are changed to include preprocessed signals from EGC (Equal Gain combiner) and MRC (Maximum Ratio combiner) schemes.