Abstract
A multiple-input multiple-output interleave division multiple access (MIMO-IDMA) system with Triple Polarized Division Multiplexing (TPDM) is presented in this paper. The present methodology replaces three independent linearly polarized antennas with a single triple polarized antenna at both the transmitter and receiver. The users in the communication link are accommodated and separated using a user-specific interleaver combined with low rate spreading sequence. To eliminate the effects of multi-stream interference (MSI), minimum mean square error (MMSE) algorithm based on successive interference cancellation (SIC) Multi-user detection (MUD) technique is employed at the receiver. Furthermore, log-maximum a posteriori probability (MAPP) decoding algorithm is implemented at the mobile stations (MSs) to overcome the effects of multi-user interference (MUI) effects. The paper also evaluates the effects of coded MIMO-IDMA in the downlink communication by adopting the Stanford University Interim (SUI) and Long-term Evolution (LTE)channel model specifications. In comparison with the traditional uncoded system, the present solution considering turbo coded triple-polarized MIMO-IDMA system with iterative decoding algorithm provides better bit error rate (BER) with reduced signal to noise ratio (SNR). The simulation results also show that though the SNR requirement is higher for the proposed technique compared to the conventional uni-polarized antenna based MIMO-IDMA system, it gives the advantages of achieving higher data rate with reduced cost and space requirements in the context of a downlink (DL).
Highlights
The triple-polarized multiple-input multiple-output (MIMO) with interleave division multiple access (IDMA) techniques has evolved as the generation wireless system as it supports higher data rate with reduced inter symbol interference (ISI) and MAI
To further improve the diversity gain without increasing the number of antenna elements, this paper investigates the performance of a triple polarized MIMO-IDMA system over correlated frequency selective channels
The Doppler shift of 0.5 and 2.5 Hz are considered with an antenna correlation coefficient of 0.7, 0.4 and 0.3 for Stanford University Interim (SUI)-1, SUI-3 and SUI-5 channel models [37] respectively
Summary
The triple-polarized multiple-input multiple-output (MIMO) with interleave division multiple access (IDMA) techniques has evolved as the generation wireless system as it supports higher data rate with reduced inter symbol interference (ISI) and MAI. It has been demonstrated that the capacity of the channel can be improved by increasing the number of antennas used in the communication system. Further to minimize the coupling effects between the antennas, the radiating elements are spaced at least half a wavelength at the subscriber station and ten times the wavelength in case of the base stations [1]. This assures maximum capacity and reliable benefits achievable in a MIMO-IDMA wireless system. This poses stringent specifications on the infrastructure resulting in increased cost. This paper aims to overcome this limitation through the usage of triple-polarized antennas for MIMO-IDMA system
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