Multiplexed binary offset carrier: Difference between revisions

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{{Short description|Radio modulation design}}

'''Multiplexed binary offset carrier''' ('''MBOC''') modulation<ref name="NAVIPEDIA_MBOC">[https://gssc.esa.int/navipedia/index.php/MBOC_Modulation Navipedia information on MBCO Modulation]</ref><ref name="GAL_ICD">[http://ec.europa.eu/enterprise/policies/satnav/galileo/files/galileo-os-sis-icd-issue1-revision1_en.pdf Galileo Open Service Signal In Space Interface Control Document (OS SIS ICD)] {{webarchive|url=https://web.archive.org/web/20140611093741/http://ec.europa.eu/enterprise/policies/satnav/galileo/files/galileo-os-sis-icd-issue1-revision1_en.pdf |date=2014-06-11 }}, GSA, Issue 1.1, September 2010</ref><ref>[{{cite journal |last=Hoult, |first=N.; |last2=Aguado, |first2=L. E. and |last3=Xia, |first3=P. |title=MBOC and BOC(1,1) Performance Comparison. |journal=Journal of Navigation, Volume |volume=61, No. |issue=4, pp613–627,|pages=613–627 |date=2008 (NaviJournal08)] |doi=10.1017/S0373463308004918 }}</ref> is a modulation design proposed for [[Galileo (satellite navigation)|Galileo]]<ref name="GAL_ICD"/> and modernized [[Global Positioning System|GPS]] satellite navigation signals, which combines a sine [[binary offset carrier]] SinBOC(1,1) signal with a SinBOC(6,1) signal, either via weighted sum/difference (the CBOC implementation) or via time-multiplexing (the TMBOC implementation).

The main objective of the common GPS and Galileo signal design activity was that the [[power spectral density]] (PSD) of the proposed solution would be identical for GPS L1C and Galileo E1 OS signals when the pilot and data components are computed together.<ref name="NAVIPEDIA_MBOC"/> This assures high interoperability between both signals. Its power spectral density <math>\Phi(f)</math> is defined by<ref>[httphttps://www.losangeles.afspaceforce.mil/shared/media/document/AFD-070803-061.pdf Agreement06] {{webarchive|url=https://web.archive.org/web/20110725125416/http://www.losangeles.af.mil/shared/media/document/AFD-070803-061.pdf |date=2011-07-25 }}</ref>

: <math>\Phi(f) = \frac{10}{11}BOC(1,1)+\frac{1}{11}BOC(6,1)</math>

MBOC has two main implementations, the [[Composite Binary Offset Carrier]] (CBOC) implementation, currently used in [[Galileo (satellite navigation)|Galileo]], and the Time-Multiplexed Binary Offset Carrier (TMBOC), currently used in the modernized [[GPS]] L1C signal.

== See also ==

*[[Binary offset carrier modulation]]

== References ==