Paper Info
Title
Estimation of residual carrier and sampling frequency offsets in OFDM-SDMA uplink transmissions
Abstract
This paper investigates the estimation of multiple residual carrier frequency offsets (RCFOs) and sampling frequency offsets (SFOs) in the uplink of a multiuser OFDM network with space division multiple access (SDMA). The proposed solutions are based on the presence of some dedicated pilot tones within the signal spectrum, which are traditionally employed in OFDM systems to track channel variations and residual frequency errors. The main obstacle is the large number of parameters involved in the estimation process, which makes the uplink synchronization a rather challenging task. A practical solution to this problem relies on the separation of the received signals before the estimation procedure is started. This way, the RCFOs and SFOs of different users are estimated independently with affordable complexity. We propose two alternative approaches for users' separation. The former is based on the use of orthogonal pilot sequences, while the latter exploits the distinct spatial signatures of the uplink signals. Computer simulations and theoretical analysis are employed to assess the performance of the proposed schemes and to make comparison with existing alternatives.
Year
DOI
Venue
2010
10.1109/TWC.2010.02.090164
IEEE Transactions on Wireless Communications
Keywords
Field
DocType
residual carrier frequency offset,residual frequency errors,dedicated pilot tone,uplink synchronization,ofdm-sdma,space division multiple access,sampling frequency offset,frequency estimation.,ofdm modulation,estimation procedure,ofdm-sdma uplink transmissions,ofdm system,residual frequency error,sampling frequency offsets,multiple residual carrier frequency,ofdm-sdma uplink transmission,channel variations,multiuser ofdm network,multiple residual carrier frequency offsets,uplink signal,estimation process,sampling methods,ofdm,spectrum,estimation,synchronization,sampling frequency,computer simulation
Residual,Synchronization,Control theory,Frequency offset,Electronic engineering,Real-time computing,Estimation theory,Space-division multiple access,Residual carrier,Orthogonal frequency-division multiplexing,Mathematics,Telecommunications link
Journal
Volume
Issue
ISSN
9
2
1536-1276
Citations 
PageRank 
References 
3
0.45
16
Authors
3
Name
Order
Citations
PageRank
Michele Morelli176951.27
Giuseppe Imbarlina2131.80
Marco Moretti313816.56