A Study on Spatial MMSE Despreading for OSTSTD in a Fast Fading Channel
نویسندگان
چکیده
Spatial despreading weight based on minimum mean square error (MMSE) criterion is derived for orthogonal space-time spreading transmit diversity (OSTSTD) in a fast fading channel, taking into account the inter-antenna interference (IAI) and the inter-code interference (ICI) caused by orthogonality distortion of time-domain spreading codes. Average bit error rate (BER) performance is theoretically analyzed and confirmed by computer simulation to show that the diversity gain can be obtained even in a fast fading. key words: OSTSTD, spatial MMSE despreading, fast fading
منابع مشابه
Orthogonal Space-Time Spreading Transmit Diversity
AbstractIn this paper, a new 2-antenna transmit diversity, called orthogonal space-time spreading transmit diversity (OSTSTD) combined with time diversity transmission, is proposed. At the transmitter, N data symbols to be transmitted are spread using N different orthogonal space-time spreading codes (each represented by N-by-N matrix) and are transmitted from two transmit antennas after adding...
متن کاملOFDM and DS-CDMA approaches, analysis of performances on fading multipath channels
In this paper we show how orthogonality constraints for DSCDMA spreading sequences yield directly to OFDM sequences. Having shown this duality we do a comparison of performances between these two waveforms in a multipath fading channel context. The comparison includes the MC-CDMA approach. We show how the cyclic prefix solution can be used for DSCDMA in order to propose an MMSE optimal despread...
متن کاملPerformance Analysis of Ml and Mmse Decoding Using Gradient Based Algorithm
Discrete-time all-analog-processing joint source-channel coding with Maximum Likelihood (ML) and Minimum Mean Square Error (MMSE) detections are employed in fast fading Rayleigh channel. Co-operative communication achieves spatial diversity using single antenna devices. Spatial diversity improves the performance of analog joint source-channel coding in wireless fading channels. In the case of d...
متن کاملOn Channel Estimation for OFDM/TDM Using MMSE-FDE in a Fast Fading Channel
MMSE-FDE can improve the transmission performance of OFDM combined with time division multiplexing (OFDM/TDM), but knowledge of the channel state information and the noise variance is required to compute the MMSE weight. In this paper, a performance evaluation of OFDM/TDM using MMSE-FDE with pilot-assisted channel estimation over a fast fading channel is presented. To improve the tracking abili...
متن کاملTime-Varying Frequency Fading Channel Tracking In OFDM-PLNC System, Using Kalman Filter
Physical-layer network coding (PLNC) has the ability to drastically improve the throughput of multi-source wireless communication systems. In this paper, we focus on the problem of channel tracking in a Decode-and-Forward (DF) OFDM PLNC system. We proposed a Kalman Filter-based algorithm for tracking the frequency/time fading channel in this system. Tracking of the channel is performed in the t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- IEICE Transactions
دوره 89-B شماره
صفحات -
تاریخ انتشار 2006