TY - GEN
T1 - Interference cancellation for space-frequency ofdm mimo systems
T2 - 2005 IEEE Wireless Communications and Networking Conference, WCNC 2005: Broadband Wirelss for the Masses - Ready for Take-off
AU - Song, L. Y.
AU - Burr, Alister G.
PY - 2005
Y1 - 2005
N2 - One major assumption in most existing space-frequency (SF) OFDM systems is that neighboring OFDM sub-channels (SCs) have the same channel transfer functions (CTFs). However, this assumption might be not feasible for small number of SCs or long code block length because in such cases the channel gains between adjacent SCs will not be approximately constant. Even if the number of SCs is large enough, in some parts of the OFDM spectrum, or in a severe multi-path environment, the variation of the channel gain cannot be ignored. Because of this the linear ML decoder in [1] cannot be readily used to achieve maximum diversity, and it will cause an irreducible error floor in the high signal-to-noise ratio (SNR) region. To this end, this paper proposes an interference cancellation (IC) signal detector to reduce the error floor. While the computational complexity of the IC detector is a little higher than that of the conventional ML linear detector, the new IC detector provides much better performance by subtracting the interference resulting from variations between the adjacent SCs.
AB - One major assumption in most existing space-frequency (SF) OFDM systems is that neighboring OFDM sub-channels (SCs) have the same channel transfer functions (CTFs). However, this assumption might be not feasible for small number of SCs or long code block length because in such cases the channel gains between adjacent SCs will not be approximately constant. Even if the number of SCs is large enough, in some parts of the OFDM spectrum, or in a severe multi-path environment, the variation of the channel gain cannot be ignored. Because of this the linear ML decoder in [1] cannot be readily used to achieve maximum diversity, and it will cause an irreducible error floor in the high signal-to-noise ratio (SNR) region. To this end, this paper proposes an interference cancellation (IC) signal detector to reduce the error floor. While the computational complexity of the IC detector is a little higher than that of the conventional ML linear detector, the new IC detector provides much better performance by subtracting the interference resulting from variations between the adjacent SCs.
KW - MIMO
KW - OFDM
KW - Space-Frequency Codes
KW - Space-Time Codes
UR - http://www.scopus.com/inward/record.url?scp=24944432799&partnerID=8YFLogxK
U2 - 10.1109/WCNC.2005.1424541
DO - 10.1109/WCNC.2005.1424541
M3 - Conference contribution
AN - SCOPUS:24944432799
SN - 0780389662
T3 - IEEE Wireless Communications and Networking Conference, WCNC
SP - 444
EP - 448
BT - 2005 IEEE Wireless Communications and Networking Conference, WCNC 2005
Y2 - 13 March 2005 through 17 March 2005
ER -