Adaptive channel estimation for MIMO-constant envelope modulation

Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The authors have proposed Multi-Input Multi-Output (MIMO)-Constant Envelope Modulation, (MIMO-CEM), as a power and complexity efficient alternative to MIMO-OFDM, suitable for wireless backhaul networks in which relay nodes are fixed in their positions. One of the major problems hindering the real application of MIMO-CEM is to estimate MIMO channel characteristics. MIMO-CEM is based upon two contrary schemes; one is nonlinear equalization such as maximum likelihood sequence estimator, which needs accurate channel information to replicate the received signal passing through it. The other is a low resolution analog-to-digital converter (ADC), e.g., 1-bit in the default operation that removes the received signal amplitude fluctuation. In this paper, as a solution to the channel estimation problem in MIMO-CEM with low resolution ADC receiver, we propose an adaptive MIMO-CEM channel estimation scheme where iterative adaptive channel estimation is carried out to minimize the error between the received preamble signal and the replicated one. We also prove that Code Division Multiplexing (CDM) preamble transmission is effective in estimating MIMO channel parameters in the presence of large quantization noise. Computer simulation results show that MIMO-CEM with the proposed channel estimator using CDM preambles achieves identical BER performance to that with the ideal channel estimation even in presence of severe quantization noise caused by a low resolution ADC.

Original languageEnglish
Pages (from-to)2393-2404
Number of pages12
JournalIEICE Transactions on Communications
VolumeE95-B
Issue number7
DOIs
Publication statusPublished - Jan 1 2012

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Channel estimation
Digital to analog conversion
Modulation
Multiplexing
Orthogonal frequency division multiplexing
Maximum likelihood
Wireless networks
Computer simulation

All Science Journal Classification (ASJC) codes

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

Cite this

Adaptive channel estimation for MIMO-constant envelope modulation. / Mahmoud Mohamed, Ehab; Muta, Osamu; Furukawa, Hiroshi.

In: IEICE Transactions on Communications, Vol. E95-B, No. 7, 01.01.2012, p. 2393-2404.

Research output: Contribution to journalArticle

Mahmoud Mohamed, Ehab ; Muta, Osamu ; Furukawa, Hiroshi. / Adaptive channel estimation for MIMO-constant envelope modulation. In: IEICE Transactions on Communications. 2012 ; Vol. E95-B, No. 7. pp. 2393-2404.
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