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:
Jul. 09, 2013
Filed:
Dec. 02, 2009
Didier Johannes Richard Van Nee, De Meern, NL;
Vincent Knowles Jones, Iv, Redwood City, CA (US);
Geert Arnout Awater, Utrecht, NL;
James Gardner, San Ramon, CA (US);
Didier Johannes Richard van Nee, De Meern, NL;
Vincent Knowles Jones, IV, Redwood City, CA (US);
Geert Arnout Awater, Utrecht, NL;
James Gardner, San Ramon, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A soft symbol decoder for use in a multiple input multiple output (MIMO) and OFDM (orthogonal frequency division multiplexing) system. The decoder generates soft symbol values for a digital signal that represents a number of source bits. The source bits are transmitted as symbols in corresponding to points in a signaling constellation. Soft metrics are determined by searching for all possible multi-dimensional symbols that could have been transmitted. The method includes transmitting a sample of the multi-dimensional symbol using K transmit antennas. The multi-dimensional symbol is represent-able as a complex, K-dimensional vector x. Each vector component of vector x represents a signal transmitted with one of the K transmit antennas. After transmission through a communication channel, a sample corresponding to the transmitted sample is received. The received sample is represented by a complex, N-dimensional vector y, where N is the number of receive antennas in the MIMO system. After the sample is received, a soft metric L(b) is determined for each bit bencoded by x according to the equation: and xrepresents all possible values for x. In addition, a reduced complexity method is used for providing soft metric values in the MIMO system. This exemplary aspect reduces the complexity of the above computations from 2to 2, where B is the number of bits transmitted per symbol per antenna.