Abstract
This paper presents signal structure and power efficiency performance for simultaneous transmission of Global Navigation Satellite System (GNSS) service signals based on Tiered Polyphase Code (TPC). For the simultaneous transmission of three or more service signals, the intermodulation terms addition and modification of the power allocations for the signal multiplexing are applied first to the spreading signal with the binary pseudorandom noise (PRN) code and a constant envelope signal is generated. Then, Zadoff-Chu sequence is applied as a secondary code to generate a multiplexed satellite navigation signal having a constant envelope characteristic. Simulation results show that power efficiency performance of more than 80% can be achieved in three service signal multiplexing.
Highlights
The use of Tiered Code (TC) using pseudo random noise (PRN) code of hierarchical structure is becoming popular as a method to facilitate signal acquisition in weak signal environment of Global Navigation Satellite System (GNSS) navigation signal
When the simultaneous transmission is performed based on the Tiered Polyphase Code (TPC), the signal generation structure needs to be changed since the secondary code of the TPC is non-binary
We propose a signal generation structure that can maintain constant envelope characteristics when simultaneously transmitting three or more GNSS service signals based on TPC
Summary
The use of Tiered Code (TC) using pseudo random noise (PRN) code of hierarchical structure is becoming popular as a method to facilitate signal acquisition in weak signal environment of Global Navigation Satellite System (GNSS) navigation signal. Tiered Polyphase Code (TPC) structures have been proposed to reduce intra-system interference as well as increase processing gain by applying non-binary polyphase codes to the secondary codes. Simultaneous transmission of three or more signals may degrade the power efficiency of the satellite high power amplifier. In order to minimize the degradation of power efficiency, various methods have been proposed to keep the envelope of the generated signal constant. When the simultaneous transmission is performed based on the TPC, the signal generation structure needs to be changed since the secondary code of the TPC is non-binary. We propose a signal generation structure that can maintain constant envelope characteristics when simultaneously transmitting three or more GNSS service signals based on TPC. It is shown that the power efficiency of the amplifier is not different from the power efficiency of the binary signals during the amplification of the signal generated by the proposed method
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