Alamouti for Frequency Selective Channels The Alamouti scheme can be extended to consider wideband, frequency selective fading channels such as those applicable to indoor small cells. The authors in [104] discuss receiver techniques to cope with wideband channels based on the W-CDMA physical layer. Performance of these techniques is explored in the following, for the case of the small cell. Figure 3.3 Multipath STTD Consider Figure 3.3. The received signal on path by the transmitted signal at time instant T is given j by: (3.4) where denotes the Rayleigh fading of the multipath of the transmit antenna at the receiver. jth ith Similarly at time : (3.5) For each multipath, the UE does the following linear processing to generate soft symbols jth respectively: (3.6) Soft outputs from all multipaths can be combined to generate the net output for symbol as: (3.7) similarly for (3.8) Simulation of Alamouti for W-CDMA
Alamouti for Frequency Selective Channels The Alamouti scheme can be extended to consider wideband, frequency selective fading channels such as those applicable to indoor small cells. The authors in [104] discuss receiver techniques to cope with wideband channels based on the W-CDMA physical layer. Performance of these techniques is explored in the following, for the case of the small cell. Figure 3.3 Multipath STTD Consider Figure 3.3. The received signal on path j by the transmitted signal at time instant T is given by: (3.4) where denotes the Rayleigh fading of the jth multipath of the ith transmit antenna at the receiver. Similarly at time : (3.5) For each jth multipath, the UE does the following linear processing to generate soft symbols respectively: (3.6) Soft outputs from all multipaths can be combined to generate the net output for symbol as: (3.7) similarly for (3.8) Simulation of Alamouti for W-CDMA
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