Skip Navigation
Small Business Innovation Research/Small Business Tech Transfer

Minimizing Implementation Loss in Soft-Decision GMSK Demodulators

Completed Technology Project

Project Description

Minimizing Implementation Loss in Soft-Decision GMSK Demodulators
Gaussian Minimum Shift Keying (GMSK) is a CCSDS standard scheme for space missions requiring very bandwidth efficient communications using transceivers with strict size, weight, and power restrictions. GMSK provides a constant envelope signal that passes unaltered through system nonlinearities, allowing efficient power amplifier operation without extensive filtering and predistortion. Unfortunately, current off-the-shelf GMSK and related continuous phase modulation (CPM) receivers (e.g., multi-h CPM) operate far from predicted theoretical performance and suffer from frequent link dropouts. CPM performance issues are mostly attributable to a failure to adequately model and mitigate against transmitter, channel, and receiver impairments, including fixed-point processing effects, and to generate reliable soft-decision information for decoding. To maximize performance given CCSDS turbo or LDPC coding and eliminate communications dropouts, a soft-decision generating GMSK demodulator with carefully designed impairment estimation and compensation is proposed. More »

Anticipated Benefits

Primary U.S. Work Locations and Key Partners

Technology Transitions

Light bulb

Suggest an Edit

Recommend changes and additions to this project record.

This is a historic project that was completed before the creation of TechPort on October 1, 2012. Available data has been included. This record may contain less data than currently active projects.