Telecommunication system transceiver in transform domain and its realization method

Abstract

The invention discloses a transceiver of a transform domain communication system and an implementation method thereof. The modulated data signal is transmitted by an (OFDM, Orthogonal Frequency Division Multiplexing) transmitter; the TDCS receiver receives the data signal through the OFDM receiver, and obtains the data sent by the TDCS transmitter through demodulation. The solution of the invention simply realizes the TDCS transceiver, improves the anti-interference ability of the equipment, and reduces the cost of the equipment at the same time.

Description

technical field [0001] The present invention relates to a transform domain communication system (TDCS, Transform Domain Communication System), in particular to a transform domain communication system transceiver and its implementation method. Background technique [0002] The basic idea of ​​TDCS is to avoid the interference of existing users on the transmitted signal by dynamically changing the spectrum of the transmitted signal within a given spectrum range, and to avoid the interference of the transmitted signal to existing users. [0003] Usually, in the TDCS transmitter, the modulation uses CCSK (Cyclic CodeShift Keying), and CCSK is an M-ary modulation manner. The simplest implementation of CCSK modulation is to first select a base function (Base Function) b(t), then perform a cyclic shift on the base function according to the data to be sent, and finally send the cyclically shifted base function. [0004] figure 1 It is a block diagram of a TDCS transmitter based on...

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Problems solved by technology

[0021] In addition, there is currently a low-interception rate communication system transceiver solution, which is similar to the Fourier transform-based TDCS transceiver solution. The low-interception rate communication system transmitter is the same as the Fourier transform-based TDCS transmitter, and will not be repeated here; low The receiver of the intercept rate communication system performs fast Fourier transform on the received signal, and multiplies the transformed result by the independently generated sequence complex B used by the transmitter of the low intercept rate communication system b (ω) the same complex sequence, then remove the maximum value in the result vector obtained by multiplication, and finally perform fast Fourier transform on the obtained vector to obtain the decision sequence, and find the element corresponding to the largest magnitude in the decision sequence Subscript, so as to get the estimated value of the transmitted data symbol Here, a global search needs to be performed when making a decision, and the global search is a time-consuming process, and the elements that are not modulated by CCSK will be searched during the global search. When these elements are strongly interfered, there will be misjudgment, which increases the receiving end. total misjudgment probability

[0022] Based on the two existing implementations of TDCS transceivers, the main problem is that the implementation of TDCS transceivers is complicated, which reduces the anti-interference ability of the equipment and increases the cost of the equipment.

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