MIMO system with relative phase difference time-shift modulation in rician fading environments

Kenichi Kobayashi, Takao Someya, Tomoaki Ohtsuki, Sigit P.W. Jarot, Tsuyoshi Kashima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In line-of sight (LOS) environments, the performance of Multiple-Input Multiple-Output (MIMO) systems depends largely on the difference of the phase difference of direct paths from transmit antennas to each receive antenna. When the phase difference of direct paths are close to each other, the spatial division multiplexing (SDM) channel is not orthogonal to each other so that the signal detection becomes difficult. In this paper, we propose a MIMO system with relative phase difference time-shift modulation (RPDTM) in Rician fading environments. The proposed scheme transmits independent signals from each antenna at each time slot where relative phase difference between signal constellations used by transmit antennas varies with a pre-determined pattern. This transmission virtually changes the phase difference of direct paths from transmit antennas to each receive antenna without lowering data rate and without knowledge of the channels. In addition, forward error correction coding (ECC) is applied to exploit the time slots where the receiver can detect the signals easily to improve the detection performance. From the results of computer simulation, we show that MIMO system with RPDTM can achieve the better bit error rate (BER) than the conventional MIMO system. We also show that the MIMO system with RPDTM is effective by about Rician factor K = 10 dB.

Original languageEnglish
Title of host publicationICC 2008 - IEEE International Conference on Communications, Proceedings
Pages732-736
Number of pages5
DOIs
Publication statusPublished - 2008
EventIEEE International Conference on Communications, ICC 2008 - Beijing, China
Duration: 2008 May 192008 May 23

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486

Other

OtherIEEE International Conference on Communications, ICC 2008
CountryChina
CityBeijing
Period08/5/1908/5/23

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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  • Cite this

    Kobayashi, K., Someya, T., Ohtsuki, T., Jarot, S. P. W., & Kashima, T. (2008). MIMO system with relative phase difference time-shift modulation in rician fading environments. In ICC 2008 - IEEE International Conference on Communications, Proceedings (pp. 732-736). [4533179] (IEEE International Conference on Communications). https://doi.org/10.1109/ICC.2008.143