Qualcomm Incorporated

Stmicroelectronics S.r.l.

Nxp B.v.

Stefano Tomasin

John Edward Smee

Jilei Hou

Henry David Pfister

Nevio Benvenuto

Fabio Osnato

Luigi Agarossi

Marco Odoni

Filippo Spalla

Jilei c/o Qualcomm Incorporated Hou

John Edward c/o Qualcomm Incorporated Smee

A method and system for interference cancellation (IC). One aspect relates to traffic interference cancellation. Another aspect relates to joint IC for pilot, overhead and data. Another aspect relates to improved channel estimation. Another aspect relates to adaptation of transmit subchannel gains.

Traffic interference cancellation

Channel estimation for interference cancellation

Joint interference cancellation of pilot, overhead and traffic channels

Adaptation of transmit subchannel gains in a system with interference cancellation

A fast Fourier transformation is performed on a first vector of signals, and as a result a second vector of signals is provided. A feed forward equalization is performed by multiplying each of the components of said second vector with equalization parameters, and as a result a third vector of signals is provided. An inverse fast Fourier transformation is performed on said third vector, and as a result a fourth vector of signals is provided. An output signal of said first section is provided on the basis of said fourth vector of signals. In a second section a signal derived from an output signal of said second section is is filtered via linear feedback filtering and the filtered signal is added to said first section output signal, and an added signal is provided, and said second section output signal is generated by extracting samples from said added signal.

Frequency-domain decision feedback equalizing device and method

A wireless CDMA communication system receiver receives a stream of chips generated by spreading data symbols formed by grouping bits of information at a wireless CDMA communication transmitter which are broadcast at a certain chip-rate. The received chips are de-spread and symbols pertaining to respective users are reconstructed. The stream of chips are formatted into blocks of chips, and an iterative block decision feedback equalization is performed in a frequency domain at the chip-rate of the broadcast stream of chips to remove inter-symbol interference by defining a transfer function. The chips generated are interleaved by spreading each data symbol being transmitted before broadcasting the stream of interleaved chips in distinct blocks of chips.

Frequency-domain multi-user access interference cancellation and nonlinear equalization in CDMA receivers

Growing community of inventors

Venice, Italy

Stefano Tomasin