Method and system for adaptive channel estimation techniques

Details Method and system for adaptive channel estimation techniques Method and system for adaptive channel estimation techniques

2001-12-14

2003-10-28

Urban, Edward F. (Department: 2685)

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

C455S067140, C455S067130, C455S067160, C375S340000, C375S148000

Reexamination Certificate

active

06640088

ABSTRACT:

FIELD OF THE INVENTION
In general, the invention relates to wireless communication systems. More specifically, the invention relates to cellular communications and in particular, to a method and system for channel estimation within cellular communications.
BACKGROUND OF THE INVENTION
For optimal reception of a digital signal over a broadband cellular channel, the channel to a desired transmitter must be determined. Because channels can consist of a number of multipath components or rays each with its own time of arrival and Doppler frequency, a channel estimator should determine the actual time of arrivals (TOA's), Doppler frequencies, and their corresponding complex gains. The channel estimator should also adapt to many different transmitting environments where there are a very large number of rays with a TOA spread and a Doppler frequency spread. A maximum likelihood (ML) channel estimation approach as is known in the art, may provide the best TOA and Doppler frequency estimates, however it lacks a closed form solution.
Prior art TOA estimators such as a TOA estimation using ESPRIT, are not robust to channel conditions with a large number of rays with a TOA spread and are not suitable for multi-user channel estimation. Other channel estimators may assume a worst-case channel and thus need to estimate many more parameters than is necessary under typical channel conditions.
Thus, there is a significant need for a method and device for improving multi-user channel estimation techniques that overcome the above disadvantages and shortcomings, as well as other disadvantages.


REFERENCES:
patent: 5251233 (1993-10-01), Labedz et al.
patent: 6501747 (2002-12-01), Friedlander et al.
M. D. Macleod, “Joint Detection and High Resolution ML Estimation of Multiple Sinusoids in Noise,” in Proc. ICASSP 2001, Salt Lake City, Utah, May, 2001.
Bauguo Yang, Khaled Ben Letaief, Roger S. Cheng and Zhigang Cao; “Channel Estimation for OFDM Transmission in Multipath Fading Channels Based on Parametric Channel Modeling”: IEEE Transactions on Communications, vol. 49, No. 3, Mar. 2001 pp. 467-479.
T. A. Thomas, Fred W. Vook, Kevin L Baum, “Least-Squares Multi-User Frequency-Domain Channel Estimation for Broadband Wireless Communication Systems,” 37th Allerton Conference, Monticello, IL, Sep. 1999, 10 pages.

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