Title :
Effects of Channel Estimation Errors on Spatial Pre-Coding Schemes with Phase Flipping
Author_Institution :
DoCoMo Commun. Lab. Eur. GmbH, Munich
Abstract :
In this paper the effects of channel estimation errors on spatial pre-coding schemes are analyzed. Under investigation is a novel pre-coding scheme with phase flipping, referred to as spatial phase coding (SPQ. The sensitivity of SPC to channel estimation errors in an OFDM system is compared to that of maximum ratio transmission (MRT), equal gain transmission (EGT) and transmit antenna selection diversity (SD). These diversity and pre-coding schemes have different requirements on the channel estimation and the feedback. Results are presented for a broadband OFDM system with two-dimensional pilot-symbol-aided channel estimation in a typical frequency- and time-selective propagation environment. It is shown that SPC is more robust to channel estimation errors than other spatial pre-coding schemes.
Keywords :
OFDM modulation; broadband networks; channel estimation; diversity reception; precoding; transmitting antennas; OFDM; broadband OFDM system; channel estimation errors; equal gain transmission; frequency-selective propagation environment; maximum ratio transmission; phase flipping; spatial phase coding; spatial precoding schemes; time-selective propagation environment; transmit antenna selection diversity; Channel estimation; Decoding; Degradation; Feedback; Frequency estimation; OFDM; Receiving antennas; Transmitters; Transmitting antennas; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th
Conference_Location :
Dublin
Print_ISBN :
1-4244-0266-2
DOI :
10.1109/VETECS.2007.370
