Orthogonal or Superimposed Pilots? A Rate-Efficient Channel Estimation Strategy for Stationary MIMO Fading Channels

A. Taufiq Asyhari, Stephan Ten Brink

Research output: Contribution to journalArticle

13 Citations (Scopus)
4 Downloads (Pure)

Abstract

This paper considers channel estimation for multiple-input multiple-output (MIMO) channels and revisits two competing concepts of including training data into the transmit signal, namely, orthogonal pilot (OP) that periodically transmits alternating pilot-data symbols, and superimposed pilot (SP) that overlays pilot-data symbols over time. We investigate rates achievable by both schemes when the channel undergoes time-selective bandlimited fading and analyze their behaviors with respect to the MIMO dimension and fading speed. By incorporating the multiple-antenna factors, we demonstrate that the widely known trend in which the OP is superior to the SP in the regimes of high signal-to-noise ratio (SNR) and slow fading, and vice versa, does not hold in general. As the number of transmit antennas (nt) increases, the range of operable fading speeds for the OP is significantly narrowed due to limited time resources for channel estimation and insufficient fading samples, which results in the SP being competitive in wider speed and SNR ranges. For a sufficiently small nt, we demonstrate that as the fading variation becomes slower, the estimation quality for the SP can be superior to that for the OP. In this case, the SP outperforms the OP in the slow-fading regime due to full utilization of time for data transmission.

Original languageEnglish
Article number7880605
Pages (from-to)2776-2789
Number of pages14
JournalIEEE Transactions on Wireless Communications
Volume16
Issue number5
DOIs
Publication statusPublished - 1 May 2017
Externally publishedYes

Fingerprint

Efficient Estimation
Channel Estimation
Channel estimation
Fading Channels
Fading
Multiple-input multiple-output (MIMO)
Fading channels
Fading (radio)
Signal to noise ratio
Antennas
Data communication systems
Multiple Antennas
Data Transmission
Strategy
Overlay
Range of data
Demonstrate
Antenna
Resources

Bibliographical note

Open Access . This work is licensed under a Creative Commons Attribution 3.0 License.

Keywords

  • Achievable rates
  • Doppler frequency
  • generalized mutual information
  • MIMO
  • multiple antennas
  • orthogonal pilots
  • pilot-aided channel estimation
  • superimposed pilots

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Cite this

Orthogonal or Superimposed Pilots? A Rate-Efficient Channel Estimation Strategy for Stationary MIMO Fading Channels. / Asyhari, A. Taufiq; Ten Brink, Stephan.

In: IEEE Transactions on Wireless Communications, Vol. 16, No. 5, 7880605, 01.05.2017, p. 2776-2789.

Research output: Contribution to journalArticle

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