The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 2006
Filed:
Jan. 25, 2002
Xiaoqiang MA, Princeton, NJ (US);
Hisashi Kobayashi, Princeton, NJ (US);
Stuart C. Schwartz, Princeton, NJ (US);
Daqing Gu, Morris Plains, NJ (US);
Jinyun Zhang, New Providence, NJ (US);
Xiaoqiang Ma, Princeton, NJ (US);
Hisashi Kobayashi, Princeton, NJ (US);
Stuart C. Schwartz, Princeton, NJ (US);
Daqing Gu, Morris Plains, NJ (US);
Jinyun Zhang, New Providence, NJ (US);
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Abstract
A system and method detect symbols of a modulated signal received via a plurality of channels of a wireless communications system. A symbol transmitted via the channels is initially estimated based on the channel estimate from either pilot symbol or previously estimated symbol, and then channel estimate is updated. The next estimate of the symbol is computed by using updated channel information and maximizing the expectation of the log likelihood function. The next estimate is then quantized according to the signal constellation. The quantized estimate of the symbol is compared with the previous estimate of the symbol to determine if the previous estimate of the symbol and the quantized next estimate of the symbol have converged. Otherwise, the quantized next estimate of the symbol is made as the input for the next iteration, and the updating, optimizing, quantizing, and comparing are repeated until the estimate converges.