Performance analysis of rate-adaptive modulation with imperfect estimation in OFDM systems

Based on the imperfect channel state information (CSI) from noisy channel estimation, the performance analysis of OFDM systems with continuous-rate adaptive modulation (AM) and imperfect estimation in Rayleigh fading channels is presented. Subject to a target bit error rate (BER) constraint, the ave...

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Veröffentlicht in:2013 IET International Conference on Information and Communications Technologies : April 27-29, 2013, Beijing, China S. 577 - 581
Hauptverfasser: Tan, Wenting, Yin, Xin, Yu, Xiangbin, Wei, Xiaojie, Tan, Wei
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: Stevenage, UK IET 2013
The Institution of Engineering & Technology
Schlagworte:
Communication channel equalisation and identification
Modulation and coding methods
Other topics in statistics
Radio links and equipment
spectral
imperfect estimation
adaptive modulation
Rayleigh channels
Rayleigh fading channels
fading gain
bit error rate
BER constraint
tightly-approximate closed-form expressions
continuous-rate adaptive modulation
rate-adaptive modulation
Taylor series expansion
channel estimation
nonadaptive OFDM
imperfect CSI
OFDM systems performance analysis
conditional probability density function
noisy channel estimation
OFDM modulation
imperfect channel state information
performance analysis
error statistics
ISBN:1849196532, 9781849196536
Online-Zugang:Volltext
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Zusammenfassung:Based on the imperfect channel state information (CSI) from noisy channel estimation, the performance analysis of OFDM systems with continuous-rate adaptive modulation (AM) and imperfect estimation in Rayleigh fading channels is presented. Subject to a target bit error rate (BER) constraint, the average spectral efficiency (SE) of the system with imperfect CSI is analyzed and derived, and the conditional probability density function of fading gain is given. Based on these results and using the Taylor series expansion, tightly-approximate closed-form expressions of conditional SE and average SE are further derived, respectively. These expressions can provide the direct calculation of SE, and thus avoid the numerical search of SE in the existing reference. Moreover, they include those expressions under perfect CSI as special cases. Simulation results show that the derived theoretical SE is in good agreement with the corresponding simulation, and OFDM with AM can obtain higher SE than non-adaptive OFDM.
Bibliographie:ObjectType-Article-1
ObjectType-Feature-2
SourceType-Conference Papers & Proceedings-1
content type line 22
ISBN:1849196532
9781849196536
DOI:10.1049/cp.2013.0103