This inventor holds 3 USPTO granted patents. Top assignee: Nortel Networks Corporation. Active years: 2002-2003.
Company Filing History:
Years Active: 2002-2003
Title: Chengshan Xiao: Innovator in Communication Technology
Introduction
Chengshan Xiao is a notable inventor based in Nepean, Canada. He has made significant contributions to the field of communication technology, holding a total of 3 patents. His work focuses on improving data transmission methods and enhancing the performance of radio receivers.
Latest Patents
One of Chengshan Xiao's latest patents is titled "Method and apparatus for equalization and data symbol detection for MPSK modulation." This invention discloses a method and apparatus for detecting data symbols of a multiple-phase-shift-keying (MPSK) modulated slot used for radio reception of digital data. The method and apparatus simultaneously accomplish signal equalization and symbol detection. A simplified algorithm is utilized, which is sub-optimal but closely approximates an optimal solution, significantly reducing computational load. A solution vector is constructed, and data symbol values in the solution vector are perturbated. After each perturbation, a solution error is computed to determine whether the perturbated value provides a better solution. Perturbation continues until an optimal solution is found or a maximum number of iterations have been performed. The advantage of this invention is an improved, cost-effective radio receiver that enables faster wireless data transfer.
Another significant patent is the "Method and apparatus for estimating fading distortion of a signal propagating in a communication channel." This invention relates to compensating a signal that has experienced fading distortion in a communication channel. The signal, which can be a TDMA (Time Division Multiple Access) signal, includes slots that carry data symbols. Non-uniformly spaced pilot symbols are also embedded in the slot structure. The receiver separates the incoming symbols stream into two parts: a pilot symbols stream and a data symbols stream. Since the transmitted pilot symbols are known, an estimate of the channel distortion on the pilot symbols locations can be computed. This estimate is then interpolated to provide an estimate of the fading distortion at the data symbols locations, allowing for accurate compensation of the fading distortion in the channel.
Career Highlights
Chengshan Xiao has built a successful career at Nortel Networks Corporation, where he has been instrumental in developing innovative communication technologies. His expertise in signal processing and data transmission has made him a valuable asset to the company.
Collaborations
Chengshan has collaborated with notable colleagues, including Jan Corneliu Olivier and Jiangfeng Wu