Roger Cheng is a prominent inventor based in Hong Kong, CN. He has made significant contributions to the field of Orthogonal Frequency Division Multiplexing (OFDM) technology. With a total of 3 patents, Cheng has developed innovative methods that enhance the performance of OFDM systems.

Latest Patents

One of Cheng's latest patents is focused on long echo detection and channel estimation for OFDM systems. This invention provides a method and apparatus in an OFDM receiver for detecting and compensating for long echo. The method includes a first pilot tone interpolation mechanism and a first window placement to filter a received OFDM symbol. It also features long echo channel detection coupled with a second pilot tone interpolation mechanism. Additionally, the invention addresses pre-echo and post-echo detection, where the pre-echo condition is associated with a second new window placement. Both conditions place two time windows around the first and second peak channel responses for accurate channel estimation. The long echo is estimated by obtaining power spectra of a subset of subcarriers in one OFDM symbol, performing an inverse Fourier transform on the power spectra, and determining the long echo by measuring the time between two peaks in the power profile.

Another notable patent by Cheng involves edge MMSE filters. This method performs channel estimation of an OFDM channel by interpolating pilots for sub-channels positioned within a first range of an OFDM symbol. It also estimates the frequency response of sub-channels positioned within a second range of the OFDM symbol. The first range is defined by subchannels positioned substantially away from channel edges, while the second range is defined by subchannels positioned substantially near channel edges. The method optionally includes transforming the pilots from the frequency domain into the time domain, applying time-domain windowing to obtain a channel impulse response with multiple discrete values, estimating these values, and transforming the channel impulse response back to the frequency domain.

Career Highlights

Roger Cheng is currently employed at MaxLinear, Inc., where he continues to innovate in the field of OFDM technology. His work has significantly impacted the efficiency and effectiveness of communication systems.

Collaborations

Cheng has collaborated with notable colleagues, including Rama Akella and Ramakrishna Akella, contributing to advancements in their shared field of expertise.

Conclusion

Roger Cheng is a distinguished inventor whose

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