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Multicarrier CDMA is a multiplexing approach in which modulated QAM symbols are spread over multiple OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol is repeated over multiple tones. Low density signature (LDS) is a version of CDMA with low density spreading sequence allowing us to take advantage of a near optimal ML receiver with practically feasible complexity...
With the deployment of high EIRP and high G/T L-and/ or S-band geo-synchronous mobile satellites such as TerreStar, ICO, and SkyTerra, low power and long battery-life user terminals (UTs) can be employed to provide data collection and supervisory control and data acquisition (SCADA) services. These services are typically of low data rate, low duty factor, and geographically dispersed, using unattended...
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