Space-time continuous phase modulation (CPM) signal modulation and demodulation methods
A modulation method and signal technology, applied in the field of communication, can solve the problems of increased computational complexity and high computational complexity
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Embodiment 1
[0069] Here, take the CPM modulation with memory length L=1 as an example:
[0070] (1) After constellation mapping, the two segments of source bits at the sending end are: x 1 =[x 1 (1),x 1 (2)...x 1 (2N)], x 2 =[x 2 (1),x 2 (2)...x 2 (2N)], in order to ensure that the signal phase of the original data and time-reversed and processed data is still continuous after adding CP, two redundant symbols are added to the original data, x 2 ′ = [ x 2 ( 1 ) , - 1 , x 2 ( 2 ) · · · x 2 ( 2 N ) , 1 ] ;
[0071] Assume The first precoding is ...
Embodiment 2
[0105] An example where L is greater than 1: (1) The two segments of source bits at the sending end are mapped to the constellation: x 1 =[x 1 (1),x 1 (2)...x 1 (2N)], x 2 =[x 2 (1),x 2 (2)...x 2 (2N)], add two redundant symbols f=[f(1),…,f(L)] and e=[e(1),…,e(L)] to the original data, and get:
[0106] x 1 ′ = [ x 1 ( 1 ) , f 1 ( 1 ) , · · · , f 1 ( L ) , x 1 ( 2 ) · · · x 1 ( 2 N ) ...
Embodiment 3
[0144] The transmitting part of the present invention uses precoding and time inversion processing, so that the receiving end can realize signal detection through simple linear processing after Laurent matched filtering, figure 2 Work flow chart for the receiver:
[0145] Including: down-conversion, remove CP and header symbols, matched filtering, FFT, space-time solution, and frequency-domain equalization, IFFT, decision, inverse mapping:
[0146] The receiving part mainly transforms the signal into the frequency domain through FFT to form the Alamouti space-time scheme in the frequency domain to obtain diversity and achieve equalization in the frequency domain for multipath channels.
[0147] The signal at the receiving end passes through the down-conversion part and becomes a baseband signal.
[0148] For L=1, the CPM signal with modulation factor h=1 / 2 can be expressed as follows:
[0149] s ( t ) = ...
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