Nokia Corporation

Nokia Mobile Phones Limited

Staccato Communications, Inc.

Nick Carbone

Thomas J Kenney

Jean-Marie Tran

Roberto Rimini

Tim Gallagher

Gillyoung Jung

Generating a notch in an Orthogonal Frequency Division Multiplexing (OFDM) frequency spectrum includes determining a first active interference cancellation (AIC) tone, comparing the first AIC tone with an amplitude limit, in the event that the first AIC tone exceeds the amplitude limit, constraining the first AIC tone, and determining a second AIC tone based at least in part on the first AIC tone. An Active Interference Cancellation (AIC) tone generator includes an interface configured to receive a plurality of tones, a processing component coupled to the interface, configured to determine a first AIC tone, compare the first AIC tone with an amplitude limit, and in the event that the first AIC tone exceeds the amplitude limit, constrain the first AIC tone, and determine a second AIC tone based at least in part on the first AIC tone.

Low complexity, iterative approach to active interference cancellation

Apparatus, and an associated method, for estimating the channel phase of a communication channel upon which data is communicated. When implemented in an IS-95 cellular communication system in which 1xEV-DO technology is deployed, the channel phase estimate provided by an estimator is based upon both a pilot signal and a MAC-data signal. MAC-data bits are removed out of the MAC-data signal by a MAC bit processor, and the resultant indications are combined with indications of a pilot signal to form the channel phase estimate.

Apparatus, and associated method, for estimating channel conditions of a communication channel of a communication system

The present invention relates to systems and methods that facilitate compensating for intersymbol interference (e.g. due to non-nyquist filtering) in Code Division Multiple Access (CDMA) systems (e.g., IS 95 and IS2000 systems). The subject invention employs equalization filters (e.g., T-spaced equalizers) at fingers of a RAKE receiver. By effecting such equalization filtering at a downstream point in a receiving system, e.g., at the fingers of the RAKE receiver, the filters can be run so as to operate at lower rates as compared to conventional systems where filtering is effected upstream where time is not necessarily known thus requiring equalization filters to operate at significantly faster rates (e.g., 2&#xd7; or 4&#xd7; expected chip rate). Accordingly, as compared to conventional systems where the matching filters often are of substantial complexity (e.g., &#x3e;80 taps) the present invention provides for less complex equalization filters thereby reducing overall system complexity and cost.

T-spaced equalization for 1xEV systems

A system and method for estimating the power-level of a signal received at a mobile-station receiver operating in a wireless network according to a CDMA standard. An analog automatic gain controller (AGC) loop, a digital filter, and a digital AGC loop are used, in sequence, to process a received RF signal that has been amplified, converted to baseband, and filtered using an analog baseband signal. The linear gain values of the analog AGC and the digital AGC are multiplied to produce a gain-value product. The logarithm of the gain-value product is used for executing the power-estimating function by comparison to a predetermined received-signal power estimation curve.

Device and method for CDMA-signal power estimation

A method, system, and computer program product for controlling amplification of an input transmit signal in a transmitter in order to operate a digital-to-analog converter such that its clipping point corresponds to a desired cumulative distribution level. The input transmit signal is coupled to a digital-to-analog converter and includes a plurality of independent spread spectrum channels. The spread spectrum channels have associated individual channel gains. The invention includes an approximating the total variance of the input transmit signal and determining an amplification gain corresponding to the desired cumulative distribution level using an amplification function dependent on the total variance of the input transmit signal.

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San Diego, CA, United States of America

Nick Carbone