After a systematic derivation of space-frequency block codes, the case of two transmitter antennas where unequal channels are applied to the two symbols that belong to two adjacent subcarriers is considered. At the receiver, the coefficients of the linear combiner are calculated and the expressions are given for the signal-to-noise ratios and different approaches. We propose a scheme that gives the same performance as the ML decoding with computationally efficient structure. The performance of proposed scheme is confirmed by simulations with respect to Hiperlan/2 characteristics. The solution improves the BER performance especially at high compared to ZF approach. The channel coefficients that the scheme needs can be directly estimated by using the adaptive filter in a lattice structure. b E / N0
[1]
Ravi Narasimhan.
Performance of diversity schemes for OFDM systems with frequency offset, phase noise, and channel estimation errors
,
2002,
IEEE Trans. Commun..
[2]
Douglas B. Williams,et al.
A space-frequency transmitter diversity technique for OFDM systems
,
2000,
Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137).
[3]
P. Schramm,et al.
Structure and performance of the HIPERLAN/2 physical layer
,
1999,
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).
[4]
M. Bellanger.
Adaptive digital filters
,
2001
.