1
Cybil S Leung, William D Warner: Method and apparatus for frame synchronization in mobile OFDM data communication. The University of British Columbia, Oyen Wiggs Green & Mutala, August 22, 1995: US05444697 (180 worldwide citation)

A method and apparatus are disclosed for achieving symbol (frame) synchronization of digital data in an OFDM channel such as an OFDM/FM radio link. The method and apparatus are suitable for use in a pure ALOHA environment because synchronization is achieved on a frame-by-frame basis. The required ba ...


2
Jeremy Benson, William D Warner, Paul V Yee: Adaptive predistortion of non-linear amplifiers with burst data. PMC Sierra, Knobbe Martens Olson & Bear, September 20, 2011: US08023588 (13 worldwide citation)

Apparatus and methods control predistortion of an RF transmitter. A base station or a mobile station can utilize predistortion to improve linearity characteristics of the RF power amplifier. When used effectively, predistortion limits spectral growth such that the amplified signal complies with regu ...


3
Ognjen Katic, Paul V Yee, William D Warner: Equalizer for heavily clipped or compressed communications signals. PMC Sierra, Knobbe Martens Olson & Bear, April 23, 2013: US08428113 (10 worldwide citation)

Apparatus and methods mitigate a problem of equalizing communications signals that have been distorted by severe non-linearities such as clipping or harsh compression. For example, severe non-linearity occurs when signal compression or signal clipping occurs at rates above 20% of the data transmissi ...


4
Anthony Eugene Zortea, William D Warner: Parallel replica CDR to correct offset and gain in a baud rate sampling phase detector. PMC Sierra, Knobbe Martens Olson & Bear, January 27, 2015: US08942334 (6 worldwide citation)

Apparatus and methods reduce channel-dependent phase detector offset and/or gain errors. A conventional Mueller-Muller phase detector places a main cursor at the midpoint of a pre-cursor and a post-cursor. However, for example, when the impulse response of an associated transmission line is not symm ...


5
William D Warner: Reduction of correlated channel impairments. PMC Sierra, Knobbe Martens Olson & Bear, December 17, 2013: US08611473 (4 worldwide citation)

For power efficiency, it can be desirable to use a 1-bit ADC or slicer to receive a wired data transmission. A plurality of N samples per baud period are taken. N can be, for example, 4 or more. At least a portion of the samples are included in a window of samples, the size of which is based at leas ...


6
William D Warner, Paul V Yee: Stabilized digital timing recovery using low-complexity equalizer. PMC Sierra, Knobbe Martens Olson & Bear, February 2, 2010: US07656945 (4 worldwide citation)

A low-complexity digital linear equalizer whose operation and adaptation makes stabilized digital timing recovery practical. The technique is fundamental for the operation of communications receivers employing digital timing recovery, e.g., in a modem. A technique for automatically adjusting the par ...


7
Ognjen Katic, Paul V Yee, William D Warner: Equalizer adaptation for heavily compressed or clipped communications signals. PMC Sierra, Knobbe Martens Olson & Bear, February 4, 2014: US08644369 (3 worldwide citation)

Apparatus and methods generate equalizer coefficients for an equalizer of a receiver. In a high-speed receiver, received symbols can be subject to inter-symbol-interference (ISI). An equalizer can compensate for ISI and improve a bit error rate (BER). However, traditional adaptive techniques to gene ...


8
William D Warner: Method for reducing jitter in receivers. PMC Sierra US, Dennis R Haszko, September 22, 2015: US09143371 (2 worldwide citation)

A receiver equalizer that provides improved jitter tolerance relative to common adaptation mechanisms and that also provides inter-symbol interference. Improved jitter tolerance is an important benefit for SERDES receivers as tolerance to Sinusoidal Jitter is an important performance metric specifie ...


9
William D Warner: Analog finite impulse response adaptation method and apparatus. PMC Sierra US, Dennis R Haszko, April 28, 2015: US09020022 (2 worldwide citation)

A SerDes receiver comprising: an input for receiving a signal, the signal having a baud rate; an Analog Finite Impulse Response equalizer (AFIR) for equalizing the received signal, the AFIR comprising: a pre-cursor tap having a pre-cursor coefficient; a cursor tap having a cursor coefficient, the cu ...


10
William D Warner, Anthony Eugene Zortea, Jim Guziak: Method and apparatus to control the effective gain of a statistically calibrated analog to digital converter. PMC Sierra US, Dennis R Haszko, August 26, 2014: US08816886 (2 worldwide citation)

A method and apparatus for controlling the effective gain of an ADC when the ADC is occasionally or continuously calibrated using the statistics of the input signal and when the statistics are not stationary.