Title :
Advanced Channel Estimation for MIMO-OFDM in Realistic Channel Conditions
Author :
Akhtman, J. ; Hanzo, Lajos
Author_Institution :
Univ. of Southampton, Southampton
Abstract :
An advanced decision-directed channel estimation scheme is proposed, which is suitable for employment in a wide range of multi-antenna multi-carrier systems as well as for communications over the entire range of practical channel conditions. In particular, we consider a MIMO-OFDM system operating in a mobile wireless multipath channel, which exhibits frequency-selective Rayleigh fading and is characterized by a time-variant power delay profile. Both the mean square error as well as the bit error rate performances achieved by the proposed system are documented. Specifically, we report a virtually error- free performance of a rate 1/2 turbo-coded 8times8-QPSK-OFDM system, exhibiting an effective throughput of 8middot2middot1/2=8 bits/sec/Hz, while having a pilot overhead of only 10%, at an SNR of lOdB and an OFDM-symbol-normalized Doppler frequency of 0.003, which corresponds to the mobile terminal speed of about 65 km/h.
Keywords :
MIMO communication; OFDM modulation; Rayleigh channels; channel estimation; error statistics; mean square error methods; multipath channels; turbo codes; MIMO-OFDM system; QPSK-OFDM system; bit error rate; decision-directed channel estimation; frequency-selective Rayleigh fading; mean square error; mobile wireless multipath channel; multiantenna multicarrier systems; realistic channel conditions; turbo code; Bit error rate; Channel estimation; Delay; Employment; Mean square error methods; Mobile communication; Multipath channels; Rayleigh channels; Throughput; Turbo codes;
Conference_Titel :
Communications, 2007. ICC '07. IEEE International Conference on
Conference_Location :
Glasgow
Print_ISBN :
1-4244-0353-7
DOI :
10.1109/ICC.2007.418
