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A fbmc channel estimation method based on interference correction iteration
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An interference correction and channel estimation technology, applied in channel estimation, transmission path sub-channel allocation, baseband system, etc., can solve the problem of not considering the form of fast fading channel interference, and achieve good channel estimation performance and high spectrum utilization. Effect
Active Publication Date: 2021-09-28
CHONGQING UNIV OF POSTS & TELECOMM
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However, the algorithm still assumes that the interference domain is affected by flat channels, and does not take into account the more complex interference forms in fast fading channels.
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Embodiment 1
[0037] In this embodiment, an implementation manner of grouping pilots and calculating actual pilot values of each pilot pair of pilots is provided.
[0038] In this embodiment, on the basis of the dual-pilot channel estimation algorithm, the problem of calculating wireless recursion caused by too small pilot intervals is avoided by calculating the pilot values in groups, and the mapped data information a is represented by a vector:
[0039]
[0040] Among them, a m,n Represents the data information transmitted on the nth symbol of the mth subcarrier, all of which are pure real numbers; if used with Represents two adjacent transmission pilots, X+Yj represents the predefined pilot value, X and Y are constant real numbers respectively, then at the sender The following relationship needs to be satisfied:
[0041]
[0042] Among them, α represents the weighting factor of two pilots in the pilot pair, usually take α=-j, Indicates the time-frequency point (m 0 ,...
Embodiment 2
[0053] On the basis of Embodiment 1, this embodiment provides an implementation manner in which interference compensation correction is performed on the pilot at the channel receiving end and channel estimation is performed using the pilot value after interference compensation correction.
[0054] The data stream processed in Embodiment 1 is sent into the channel, and at the receiving end, according to the predefined pilot value set at the receiving end, combined with the transmission pilot pair after linear processing to obtain a rough channel estimation value, and then through equalization and demodulation Get the estimated value of the transmission data; the receiving end receives the transmission information through the channel, and performs OQAM / FBMC demodulation on it, and the information y at the pilot point after the matched filtering m0,n0 and y m0,n0+1 Do linear processing Combined with the predefined pilot value X+Yj, we get (m 0 ,n 0 The initial channel estimat...
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Abstract
The present invention relates to the field of communications, in particular to an FBMC channel estimation method based on interference correction iteration, which includes grouping pilot pairs at the receiving end according to the minimum allowable pilot interval, and sequentially calculating the actual pilot values of each group of pilot pairs, Insert the actual pilot value of the pilot pair into the mapped data stream; perform channel estimation on the demodulated received signal to obtain the initial information of the channel, and then obtain the estimated value of the transmitted data through equalization; according to the estimated channel and data stream Symbol information, compensating for the interference at the receiving end that cannot be considered at the pilot point, using the corrected pilot value to perform channel estimation again, and obtaining a new round of iterative channel information and transmission data estimation values through interpolation equalization; the present invention Therefore, the OQAM / FBMC system can still obtain good channel estimation performance under fast fading channel conditions, and ensure a high spectrum utilization rate.
Description
technical field [0001] The present invention relates to the communication field, in particular to a channel estimation method based on an interference correction iteration filter bank multi-carrier (Filter bank multi-carrier, FBMC) channel estimation method. Background technique [0002] Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation (OQAM / FBMC) based on interleaved quadrature amplitude modulation introduces a prototype filter with good time-frequency focusing characteristics for each subcarrier, compared with the traditional OFDM Using the (Orthogonal Frequency Division Multiplexing, OFDM) system can better suppress out-of-band leakage and achieve loose synchronization. At present, as a research hotspot of multicarrier modulation system (Multicarrier Modulation, MCM), it is widely used in various communication methods such as wireless local area network, power line and optical communication. But at the same time, since OQAM / FBMC sacrifices the orthogo...
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