Interleaving and mapping method for orthogonal spread spectrum data

Abstract

The invention provides an interleaving and mapping method for orthogonal spread spectrum data in an orthogonal time-frequency space, which comprises the following steps: step 1, in the orthogonal time-frequency space, a transmitting end acquires data bits; step 2, the transmitting end performs segment processing and data modulation processing on the data bits to generate modulated data; step 3, the transmitting end performs orthogonal spread spectrum processing on each segment of modulated data to generate orthogonal spread spectrum data on a time delay Doppler plane; step 4, the transmitting end performs segment, symbol and chip interleaving processing on the data after orthogonal spectrum spreading to generate interleaved data; and step 5, the transmitting end performs data mapping on the interleaved data to generate mapped data. According to the method, when the delay Doppler resource elements in the orthogonal time-frequency space generate two-dimensional cyclic shift, the orthogonality of the spread spectrum sequence can be kept, so that effective de-spreading is realized, and a guarantee is provided for the transmission reliability of orthogonal spread spectrum data.

Description

technical field [0001] The invention relates to the communication field, in particular to an interleaving and mapping method for orthogonal spread spectrum data. Background technique [0002] Orthogonal Time Frequency Space (OTFS) modulation technology is a new type of two-dimensional modulation scheme designed in the delay Doppler (Delay Doppler, DD) domain, through which a nearly constant channel can be obtained Gain and full diversity. Due to the sparsity of channel representation in DD domain, it reduces the overhead of physical layer adaptation schemes such as channel estimation and channel equalization. Compared with modulation schemes such as OFDM and TDMA, OTFS has the following advantages: (1) OTFS provides a stable data rate without channel adaptation, which is especially important in systems with high mobility; (2) in the presence of high In the case of mobility (V2V, high-speed rail) or high phase noise (millimeter wave system), OTFS can achieve better packet e...

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Problems solved by technology

[0004] However, the scheme of applying orthogonal spread spectrum data to orthogonal time-frequency space modulation has not been proposed

If the orthogonal spread spectrum data is directly mapped to the DD plane in the orthogonal time-frequency space, the two-dimensional cyclic shift of the DD plane under the influence of the channel will destroy the orthogonality of the spread spectrum sequence in the data, resulting in the failure of data transmission

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