Research Articles

Channel and delay estimation for base-station-based cooperative communications in frequency flat-fading channels

Hongjun Xu, Laneil Padayachee
South African Journal of Science | Vol 106, No 3/4 | a60 | DOI: https://doi.org/10.4102/sajs.v106i3/4.60 | © 2010 Hongjun Xu, Laneil Padayachee | This work is licensed under CC Attribution 4.0
Submitted: 19 January 2010 | Published: 23 April 2010

About the author(s)

Hongjun Xu, School of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal – Howard College campus, South Africa
Laneil Padayachee, School of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal – Howard College campus, South Africa

Abstract

Base-station–based cooperative communication is an asynchronous cooperative communication system. The challenge therein is to estimate the relative delay between the transmitters in the system. A channel and delay estimation algorithm based on the distributed Alamouti scheme has been previously discussed for the asynchronous cooperative system. The algorithm only makes accommodation for positive delay, that is, when data from Transmitter one always arrives at the receiver before data from Transmitter two. In reality, the data from Transmitter one does not always arrive at the receiver before data from Transmitter two in the asynchronous cooperative system, because of the constantly changing mobile environment in the system. This paper extends the algorithm to accommodate both positive and negative delays, which is when the data from Transmitter one arrives at the receiver before or after data from Transmitter two, in a Rayleigh block fat-fading channel. Simulation results show that the Cramér–Rao lower bound for channel and delay estimation is achieved for different delay values. The symbol error rate performance is also achievable compared to the channel and the delay is known at the receiver.

Keywords

asynchronous cooperative communication; channel estimation; cyclic prefx; distributed space-time coding; pilot symbol design

Metrics

Total abstract views: 1380
Total article views: 2003

Reader Comments

Before posting a comment, read our privacy policy.

Post a comment (login required)

 

Crossref Citations

1. Channel and delay estimation for base-station–based cooperative communications in frequency-selective fading channels
Hongjun Xu, Laneil Padayachee
South African Journal of Science  vol: 107  issue: 7/8  year: 2011  
doi: 10.4102/sajs.v107i7/8.414