Abstract
This article covers the potential of Filter Bank Multicarrier (FBMC) modulation as an alternative to be used in the future 5G wireless networks in which Massive Multiple-Input Multiple-Output (MIMO) will be deployed. The study compares orthogonal frequency division multiplexing (OFDM) with FBMC. The former is the multiplexing technique in 4G communications and the latter is one of the strongest candidates to replace OFDM in 5G networks. This comparison evaluates the spectral efficiency (SE) of a Massive MIMO (MM) system uplink under a single-cell environment. The diversity in MM permits a self-equalization of the channel, which the FBMC further benefits from, due to the confinement of the subcarrier in an assigned range. Due to the absence of the cyclic prefix, the FBMC has better SE than the OFDM for increasing signal-to-noise-ratio (SNR). One may find a scarce literature covering the FBMC in a large-scale multiuser MIMO scenario, which considers a large number of antennas at the base station (BS). Various scenarios are considered by varying the number of antennas, users and different cell radius. Moreover, the subcarrier modulations are simulated, and not considered Gaussian distributed, as in Shannon limit theory. In some cases, the FBMC allows doubling the cell radius for the same SE value of 3.8 bits/s/Hz/user. For a fixed cell radius of 750m and a SE of 3.5 bits/s/Hz/user, the OFDM requires three times more antennas than FBMC when both modulations are under the same conditions.
Highlights
The traffic of wireless communication networks has grown exponentially and transmission rates are nearing 1 Gbit/s nowadays, which leads to higher demands on system capacity
This paper presents an spectral efficiency (SE) analysis for the orthogonal frequency division multiplexing (OFDM) and Filter Bank Multicarrier (FBMC) modulation / multiplexing schemes for MM cells, combining the works in [6], [7] and [10]
A method to analyze the SE for the MM system uplink was proposed by taking the data throughput of a single input and single output (SISO) system from simulation results that were confirmed by measurements
Summary
The traffic of wireless communication networks has grown exponentially and transmission rates are nearing 1 Gbit/s nowadays, which leads to higher demands on system capacity. The SE for the entire cell can be evaluated in different setups, with varying number of antennas, users and cell radius By adopting this strategy, the modulations being considered are simulated; providing a more representative scenario for the analysis of SE in an MM system uplink than what is presented on both [6] and [7], which considered theoretical limits of Gaussian distributed modulations. FBMC Overview The Filter Bank Multicarrier (FBMC) is a development of OFDM which focus on overcoming some limitations while enabling higher throughput data rates It is a form of multi-carrier modulation that is being investigated to be applied in wireless and cellular systems to come.
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