Communication methods and devices based on filter bank multi-carrier modulation
A multi-carrier modulation and filter bank technology, applied in multi-frequency code systems, preventing/detecting errors through diversity reception, using return channels for error prevention/detection, etc., to achieve maximum spectrum efficiency, good signal reception performance and Spectrum leakage characteristics, effects of suppressing smearing effect
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Embodiment 1
[0070] In this embodiment, performing preprocessing on the predetermined symbols includes performing a precoding operation on the predetermined symbols, that is, performing a precoding operation on the multi-carrier signal in the frequency domain, so as to cancel interference caused by a subsequent truncation operation.
[0071] For ease of understanding, the interference caused by the truncation operation is firstly analyzed when the predetermined symbols are not preprocessed.
[0072] For example, consider a system using M = 256 subcarriers, the data block contains 28 OQAM symbols (Z = {0,1,2,...,27}), the overlap factor is K = 4, and the filter parameters use PHYDYAS filtering device. The time domain response of the filter can be expressed as:
[0073] g ( 0 ) = 0 , g ( l ) = 1 - 1.94392 ...
Embodiment 2
[0106] In this embodiment, preprocessing the predetermined symbol includes selecting a signal allocated to the predetermined symbol according to different situations of the data block to be transmitted.
[0107] In one implementation, preprocessing may include allocating the required reference signals in a data block to predetermined symbols that will be affected by the truncation operation.
[0108] Generally speaking, in addition to payload data, a data block must allocate specific resources for transmitting reference signals, so that the receiving end can complete channel estimation. Since the reference signal is a known signal, and the impact of the truncation operation is mainly concentrated on the resulting ICI, and the ICI is also known, the allocation of the reference signal to the symbols affected by the truncation still allows the receiver to complete channel estimation.
[0109] Figure 5 A schematic diagram of reference signal allocation of a data block is shown. ...
Embodiment 3
[0123] In Embodiment 1 and Embodiment 2, the truncation used is to directly set the signal in the truncation interval to zero, that is, to set part or all of the trailing data to zero. The advantage of this method is that it can effectively shorten the length of the data block. However, its negative effect is that the damage to the waveform causes the frequency domain focus of the signal to deteriorate, resulting in strong out-of-band leakage. In this embodiment, the truncation operation may include performing a windowing operation on part or all of the trailing data. In one implementation, some sample points in the truncated region are set to zero, and a windowing operation is performed on the remaining part sample points. Take the data block in Embodiment 1 as an example. For example, 448 samples are truncated on both sides of the data block, 200 samples can be selected to be zeroed, and a windowing operation is performed on the remaining 248 samples.
[0124] Figure 8 S...
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