Albert Chan

Title: Innovations of Albert Chan

Introduction

Albert Chan is a notable inventor based in Cambridge, MA (US). He has made significant contributions to the field of digital communication, holding a total of 3 patents. His work focuses on improving transmission efficiency and performance in communication systems.

Latest Patents

One of his latest patents is titled "Space-time bit-interleaved coded modulation for wideband transmission." This system employs space-time coding characterized at the transmitter by bit-interleaved coded modulation (BICM) combined with multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) modulation. Space-time coding techniques enhance transmission efficiency in radio channels by utilizing multiple transmit and/or receive antennas and coordinating the signaling over these antennas. BICM provides good diversity gain with higher-order modulation schemes that employ binary convolutional codes. OFDM modulation allows for wideband transmission over frequency-selective radio channels. The receiver demodulates the OFDM signal and applies multi-input, multi-output (MIMO) demapping to estimate the BICM encoded bitstream. After deinterleaving the BICM encoded bitstream, maximum a posteriori (MAP) decoding is applied to generate soft output values. The MIMO demapping and MAP decoding processes exchange likelihood information to improve the bit error rate performance over several iterations of demapping and decoding. By applying well-known turbo-decoding principles to iteratively demap and decode, the overall receiver performance is significantly improved.

Another significant patent is "Block-iterative equalizers for digital communication system." This block-iterative equalizer is adapted for use in contemporary digital communication system receivers. In a preferred embodiment, data received over a communication channel is processed by a linear feed-forward filter, and the resulting filtered signal is provided to a slicer that makes a first set of tentative symbol decisions. During later iterations, the same received data is processed by the linear feed-forward filter, with the filter parameters modified at each iteration based on the received data. The tentative decisions are filtered by a second, 'feed-back' filter and used to improve the tentative decisions.

Career Highlights

Albert Chan has worked with prominent companies such as Agere Systems Inc. and the Massachusetts Institute of Technology. His experience in these organizations has contributed to his expertise in digital communication technologies.

Collaborations

Some of his notable coworkers include Inkyu Lee and Carl