Frequency hopping communication system and baseband implementation method thereof

Abstract

The invention discloses a frequency hopping communication system and a base band achieving method thereof. The frequency hopping communication system comprises a transmitting signal data framing module, a transmitting signal frequency hopping module, an analog-digital (AD) conversion module, an up conversion module, a power amplifier module, a transmitting antenna, a receiving antenna, a down conversion module, a digital-analog (DA) conversion module and a frequency hopping signal de-hopping synchronization module. The transmitting signal data framing module, the transmitting signal frequency hopping module, the AD conversion module, the up conversion module and the power amplifier module are sequentially connected with a transmitting antenna, the receiving antenna receives analog signals transmitted by the transmitting antenna through wireless space, the receiving antenna is further sequentially connected with the down frequency conversion module, the DA conversion module and the frequency hopping signal de-hopping synchronization module, and the transmitting signal frequency hopping module adopts a digital control oscillator. The frequency hopping communication system adopts the digital signal processing technology, achieves frequency hopping and frequency de-hopping of frequency hopping signals on a base band, reduces complexity of a hardware circuit and achieves inheritability of a communication system platform.

Description

technical field [0001] The invention relates to the field of communication remote control and telemetry, in particular to a frequency hopping communication system and a baseband implementation method thereof. Background technique [0002] In frequency hopping spread spectrum communication technology in digital information transmission system, frequency hopping is one of the most commonly used spread spectrum methods. The general frequency hopping communication system mainly adopts the method of radio frequency hopping to realize. Taking the QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) modulation method as an example, other modulation methods are similar. Assume that the complex baseband signal of the modulator is I(t)+jQ(t), (I represents the in-phase branch, Q represents the quadrature branch, t represents time), and the frequency hopping frequency point is f n , n=1, 2LN, then the frequency hopping signal is (Re means to take the real part of a c...

AI Technical Summary

Problems solved by technology

In order to realize radio frequency hopping, the system must quickly switch from one frequency point to another within a certain guard time (frequency switching time). Information cannot be transmitted during this time. If the information is not processed, the corresponding The information within the frequency change time will be lost in vain, resulting in gaps in voice communication and fixed bit errors in data communication. Realizing fast frequency hopping will inevitably lead to a decrease in modulation accuracy, deterioration of receiving sensitivity, and noise. The problem of increased dispersion

At the same time, the use of RF frequency hopping increases the difficulty and complexity of the hardware design of the RF part, and the frequency switching time between two frequency points is not conducive to the inheritance of the communication system platform.

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