Multi-slot estimation of space-time channels
نویسندگان
چکیده
In mobile communications, the multipath spacetime channel has some fast-varying (faded amplitudes of the paths) and slowly-varying (delays and directions of arrival) features. In this paper we propose to estimate the channel from limited-length training sequences by exploiting these different varying rates without explicitly computing delays and directions of arrival. Therefore, the multi-slot channel estimate is composed of two terms: the slowly-varying space-time bases estimated from L consecutive slots and the fast-varying amplitudes estimated on a slot-by-slot basis. Performance analysis and simulations conrm the expected benets of the multi-slot approach and demonstrate that for large L the mean square error (MSE) on the channel estimate depends only on the number of fast-varying parameters.
منابع مشابه
Multi-user Reduced Rank Receivers for Td/cdma Systems
M. Nicoli, Multiuser Reduced Rank Receivers for TD/CDMA Systems. In the past few years the number of users of wireless communication systems has been growing exponentially. For this reason increasing system capacity is a critical issue, especially for next generation cellular systems. Wideband code division multiple access (CDMA) is the preferred multiple access technique for third generation s...
متن کاملEstimation of Time-Varying Wireless Channels and Application to the UMTS W-CDMA FDD Downlink
In this paper we consider the estimation of mobile channels that are modeled as autoregressive processes with a bandwidth commensurate with the Doppler spread. Pilot based estimation leads to brute FIR channel estimates on a slot by slot basis. These estimates are then refined by Wiener filtering across slots that performs the optimal compromise between temporal decorrelation due to Doppler spr...
متن کاملQuasi-static antenna array processing for rapidly time-varying channels
This paper explores the use of quasi-static frequency-domain antenna combining weights for multi-user (e.g., SDMA) or multi-stream (e.g., MIMO) communication systems operating in rapidly time-varying frequency-selective channels. By implementing combining weights that are constant across a time slot but are updated from slot-to-slot (i.e., quasi-static), great computational complexity savings...
متن کاملData Detection in MIMO Systems with Co-Channel Interference
The Bell Labs Layered Space-Time (BLAST) architecture has been proposed to achieve high spectral efficiency on multi-input multi-output (MIMO) channels. Most studies of the BLAST algorithm consider spatially and temporally white noise and interference at the receiver. In this paper, we study channel estimation and data detection of a MIMO system under both spatially and temporally colored inter...
متن کاملMultislot estimation of fast-varying space-time communication channels
In mobile communications, coherent detection requires the estimate of an increasing number of channel parameters due to the promising performance of systems that deploy multiple antennas. However, the estimate of space-time channels requires a number of training symbols that grows with the number of unknowns. To overcome this problem, we propose a subspace-based estimation method that exploits ...
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:
دوره شماره
صفحات -
تاریخ انتشار 2002