Continuous phase modulation (CPM) space-time block coding (STBC) method

Abstract

The invention provides a CPM-STBC method, and aims at providing the method which is simple in coding and lower in reception and computation complexity. In a CPM-STBC coder, NU input symbols to be coded are divided into U paths of symbol streams in parallel by a serial-to-parallel converter; the U paths of symbol streams are input to a CPM modulator (102) to implement CPM on the symbol streams and further to obtain ci(t) (i=1,2 to u); the ci(t) (i=1,2 to u) is input to a sub block level STBC coder based on phase compensation, sub block level encoding is carried out on CPM signals according to classic symbol level STBC coding mapping rules, a phase compensation sub block is inserted between every two adjacent data sub block of each path of signals, and thus, V paths of parallel signals xj(t) (j=1,2 to u) are output; and a DAC carries out digital to analog conversion on the xj(t) (j=1,2 to u), and the V paths of signals are transmitted by V antennas respectively.

Description

technical field [0001] The invention relates to a continuous phase modulation encoding method and an encoder device thereof, which closely combine continuous phase modulation technology and space-time block coding technology in the field of wireless communication and perform comprehensive optimization. Background technique [0002] Continuous phase modulation (CPM) is a kind of nonlinear modulation method with constant envelope and continuous phase change. Compared with the linear modulation method represented by phase shift keying (PSK), the CPM signal has a smaller spectral sidelobe because the phase change between adjacent symbols is continuous, so it has a higher bandwidth utilization; At the same time, due to the constant envelope, the CPM signal is not sensitive to the nonlinear characteristics of the power amplifier, so it has high power efficiency and is one of the main modulation modes of various new mobile communications and radio stations. Its superior performanc...

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Problems solved by technology

However, the classic STBC is designed for linear modulation. If its symbol-level orthogonality is directly applied to CPM, the continuous phase characteristics of the signal will be severely damaged.

On the other hand, some methods have been designed for the combination of general STC (non-STBC) and CPM, but their receivers often need to use a multi-dimensional sequence detection algorithm with superimposed spatial dimensions, and the computational complexity is approximately that of a single-send-single-receive CPM system The Vth power of the computational complexity (V is the number of transmitting antennas)

In short, there is still a lack of an effective CPM-STBC encoding method that not only ensures that the encoded signal maintains a continuous phase characteristic, but also enables the receiver to achieve a good compromise between computational complexity and decoding performance.

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