Conference Paper

The MUOS-WCDMA Air Interface

General Dynamics C4 Systems, Scottsdale, AZ
DOI: 10.1109/MILCOM.2007.4455201 Conference: Military Communications Conference, 2007. MILCOM 2007. IEEE
Source: IEEE Xplore

ABSTRACT WCDMA is a 3rd generation wireless communication system developed for terrestrial cellular systems. The Mobile User Objective System (MUOS) uses WCDMA as a basis for its waveform definition, thus exploiting the extensive development of this advanced commercial communications technology. MUOS is, however, a geosatellite system which in certain ways is a vastly different communications environment than the terrestrial cellular environment. This paper shall overview key changes to the WCDMA Layer 1 to yield the MUOS waveform definition.

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    • "The DPCCH consists of dedicated pilot symbols and physical layer control signaling. (See [1].) The DPDCH and DPCCH are I/Q multiplexed and spread with orthogonal codes. "
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    ABSTRACT: The mobile user objective system (MUOS) uses WCDMA as a basis for its waveform definition. MUOS is, however, a geo-satellite system which in certain ways is a vastly different communications environment than the terrestrial cellular environment. The demand to maximize capacity has resulted in a 7 dB reduction of pilot power (relative to terrestrial WCDMA), and in very tight receiver performance requirements. These challenges are offset by much longer channel coherence times of the UHF channel. This paper shall overview key challenges and solutions in the MUOS base station RAKE receiver.
    Military Communications Conference, 2008. MILCOM 2008. IEEE; 12/2008
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    ABSTRACT: The mobile user objective system (MUOS) uses WCDMA as a basis for its waveform definition. This paper deals with the quasi-analytic method of WCDMA physical layer simulation that has been used extensively for performance simulation, model development for system simulation and development of signal processing algorithms on the MUOS project. Quasi-analytic method offers speedup factors, relative to conventional waveform simulation, of 100x or more. It is shown here that quasi-analytic can also be very accurate.
    Military Communications Conference, 2008. MILCOM 2008. IEEE; 12/2008
  • [Show abstract] [Hide abstract]
    ABSTRACT: The mobile user objective system (MUOS) is a geo-satellite communications system derived from the terrestrial cellular WCDMA air interface. WCDMA power control with the long geo-satellite round trip time presents substantial challenges. This paper describes the Point-to-Point power control system with simulation results using time-varying channel models specified by the MUOS program office.
    Military Communications Conference, 2009. MILCOM 2009. IEEE; 11/2009
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