Frequency selective mode single carrier blocking transmission method
A block transmission, single carrier technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve the problem that the sender cannot use it.
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Embodiment 1
[0095] figure 1 A block diagram of the SC-FDE system realized according to the present invention is given.
[0096] In the figure, except the signal spectrum transformation module 4 and the signal spectrum inverse transformation module 14, all other modules adopt common modules of the existing SC-FDE system, and the functions of each module are as follows:
[0097] Source module 1: Generates data to be transmitted.
[0098] Symbol mapping module 2: When the modulation mode is QAM or MPSK, map the data generated by the source to the corresponding point of the constellation diagram.
[0099] M-point FFT module 3: Transform the M mapped signals of each frame into the frequency domain to obtain the M-point frequency domain signals of the signal.
[0100] Signal spectrum transformation module 4: according to the subchannel label information sent back by the receiving end through the reverse channel, place the M-point frequency domain signal output by module 3 on the spectrum poin...
Embodiment 2
[0128] In this embodiment, the FFT (and IFFT) module in the system described in Embodiment 1 adopts segment processing—equal point segment. Replace the many FFT modules 3 of the number of points in embodiment 1 with the few FFT modules of some points (referring to figure 2 ), figure 2 21-33 in it is a 16-point FFT module.
[0129] For the simulation parameters of Embodiment 1, the number of useful sub-channels is selected as M=208, which is not an integer power of 2. Directly perform 208-point FFT calculation on the 208-point signal, and the calculation efficiency is low, so segment processing is adopted:
[0130] Take the points of each small segment as 16 (ie 2 4 ), so that a frame of 208 data s(n), (n=0, 1, ..., M-1) can be divided into 13 segments with 16 points, and each segment performs 16-point FFT operations (such as figure 2 In the module 21-33), get the frequency domain signal S(k), (k=0,1,...,M-1), such as figure 2 shown.
[0131] Receiver agrees to (k=0...
Embodiment 3
[0135] The FFT (and IFFT) modules in the system described in Example 1 are segmented - decrementing segments by powers of two. Replace the IFFT module 16 with many points in embodiment 1 with a few IFFT modules with few points (see image 3 ).
[0136] Still adopt the emulation parameter M=208 among the embodiment 1, non-integer power of 2, do not carry out equal number segmentation now, and adopt the method segmentation by the power of 2 decrement:
[0137]The transmitting end divides s(n), (n=0, 1, ..., M-1) into segments with points of 128, 64, and 16 respectively. The points of these segments are all integer powers of 2, and 128 , 64, the FFT operation of 16 points finally obtains the frequency domain signal S(k), (k=0, 1, . . . , M−1).
[0138] Receiver pair equalized signal (k=0, 1, ..., M-1) is divided into segments with 128, 64, and 16 points respectively, and IFFT operations are performed on them with 128, 64, and 16 points respectively, and finally the time domai...
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Abstract
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