# The Dual-Use and Related Goods (Export Control) Regulations 1995, Paragraph 154: DEFINITIONS OF TERMS IN THIS ANNEX


“Spectral efficiency” (5) is a figure of merit parametrized to characterize the efficiency of transmission system which uses complex modulation schemes such as QAM (quadrature amplitude modulation), Trellis coding, QPSK (Q-phased shift key), etc. It is defined as follows:
Spectralefficiency=Digital transfer rate(bits/second)6dB spectrum bandwidth (Hz)

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Source: https://www.legislation.gov.uk/uksi/1995/271/schedule/1/paragraph/154 (the official version)
Page: https://openlegislation.uk/dual-use-and-related-goods-export-control-regulations-1995/schedule-1/paragraph-154
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.