MIMO system with relative phase difference time-shift modulation for Rician fading environment

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Multiple-Input Multiple-Output (MIMO) systems that realize high-speed data transmission with multiple antennas at both transmitter and receiver are drawing much attention. In line-of sight (LOS) environments, the performance of 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) channels are not orthogonal to each other so 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 the relative phase difference between signal constellations used by transmit antennas varies in 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. If there are time slots where the receiver can separate the received signal, the receiver can decode the data by using the time slots and the correlation between data. 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=10dB.

Original languageEnglish
Pages (from-to)459-465
Number of pages7
JournalIEICE Transactions on Communications
VolumeE91-B
Issue number2
DOIs
Publication statusPublished - 2008

Fingerprint

Modulation
Antennas
Forward error correction
Signal detection
Multiplexing
Bit error rate
Data communication systems
Transmitters
Computer simulation

Keywords

  • Direct path
  • MIMO
  • Phase difference
  • Rician fading
  • Turbo code

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Software

Cite this

MIMO system with relative phase difference time-shift modulation for Rician fading environment. / Kobayashi, Kenichi; Someya, Takao; Ohtsuki, Tomoaki; Jarot, Sigit P W; Kashima, Tsuyoshi.

In: IEICE Transactions on Communications, Vol. E91-B, No. 2, 2008, p. 459-465.

Research output: Contribution to journalArticle

Kobayashi, Kenichi ; Someya, Takao ; Ohtsuki, Tomoaki ; Jarot, Sigit P W ; Kashima, Tsuyoshi. / MIMO system with relative phase difference time-shift modulation for Rician fading environment. In: IEICE Transactions on Communications. 2008 ; Vol. E91-B, No. 2. pp. 459-465.
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