CN210380915U

CN210380915U - FTN transmission equipment based on TH precoder

Info

Publication number: CN210380915U
Application number: CN201920415208.8U
Authority: CN
Inventors: 王桁; 刘爱军; 梁豪; 蔡彪; 黄鑫权
Original assignee: Army Engineering University of PLA
Current assignee: Army Engineering University of PLA
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-04-21
Anticipated expiration: 2029-03-28

Abstract

A transmitting end comprises a channel encoder, an interleaver, a constellation mapper, a TH precoder and a shaping filter which are connected in sequence, a receiving end comprises a matched filter, a channel equalizer, a constellation demapper, a deinterleaver, a channel decoder, an interleaver and a constellation demapper, a received signal of the receiving end is input into the input end of the matched filter, the output end of the matched filter is connected with the input end of the channel equalizer, and the channel equalizer, the constellation demapper, the deinterleaver, the channel decoder, the interleaver and the constellation demapper form a Turbo iterative equalization circuit structure. The utility model discloses can transmit more symbol information under the same bandwidth condition, further improve the frequency band utilization efficiency of system, guarantee FTN transmission reliability to reduce receiving terminal signal detection complexity, alleviate receiving terminal signal processing burden, thereby reduce the receiving arrangement cost.

Description

FTN transmission equipment based on TH precoder

Technical Field

The utility model belongs to the technical field of communication, a sending end and receiving terminal of communication transmission equipment are related to, are a FTN transmission equipment based on TH precoder.

Background

With the rapid development of the internet and communication technology, in recent years, the communication data and traffic volume of users have increased dramatically, and the contradiction between the massive user data transmission requirements and the scarce spectrum resources is undoubtedly the main problem faced by the wireless communication system. The Faster-than-Nyquist FTN (fast-than-Nyquist) transmission technology breaks through the Nyquist criterion followed by the conventional modulation technology, can transmit more symbol information under the condition of the same bandwidth, opens up a new direction for further improving the spectral efficiency, but the severe intersymbol interference (isi) introduced by the FTN provides a challenging problem for effective detection of signals, and greatly increases the complexity of detection of receiving end signals.

Tomlinson-Harashima Precoding, referred to as TH Precoding for short, is a common Precoding technique in a wireless communication system, and can be regarded as moving a feedback part of a decision feedback equalizer to a transmitter end for processing, subtracting a symbol suffering from interference from a transmitted bit at the transmitter end, reducing ISI influence, and avoiding an error propagation problem. If the TH precoding technology can be applied to the FTN transmission system, the intersymbol interference of the system can be reduced, and meanwhile, the detection complexity of a receiving end can be reduced, so that the FTN transmission system based on the TH precoding technology has important research value.

Disclosure of Invention

The utility model discloses the problem that solves is: aiming at the ISI problem of intersymbol interference in FTN transmission, how to apply a TH precoding technology to an FTN transmission system.

The technical scheme of the utility model is that: the transmitting end comprises a channel encoder, a transmitting end interleaver, a transmitting end constellation mapper, a TH precoder and a shaping filter which are sequentially connected, an information source is connected with the input end of the channel encoder, the receiving end comprises a matching filter, a channel equalizer, a constellation demapper, a deinterleaver, a channel decoder, a receiving end interleaver and a receiving end constellation demapper, a received signal of the receiving end is input into the input end of the matching filter, the output end of the matching filter is connected with the input end of the channel equalizer, the constellation demapper, the deinterleaver, the channel decoder, the receiving end interleaver and the receiving end constellation demapper form a Turbo iteration equalization circuit structure, and the output end of the channel decoder is connected to an information sink.

Preferably, the channel encoder is a digital encoder employing (7,5)₈A channel encoder for recursive systematic convolutional codes.

Further, the Turbo iterative equalization circuit structure specifically includes: the channel equalizer, the constellation demapper, the deinterleaver and the channel decoder are sequentially connected, and the outputs of the deinterleaver and the channel decoder are superposed and then input into the receiving end interleaver and then output to the input end of the channel equalizer through the receiving end constellation demapper.

The utility model discloses can transmit more symbol information under the same bandwidth condition, further improve the frequency band utilization efficiency of system, the utility model discloses adopt the TH precoder to eliminate FTN transmission system intercode and crosstalk at the sending end, reduce receiving terminal signal detection complexity, alleviate receiving terminal signal processing burden to reduce the receiving arrangement cost.

Compare with the tradition communication transmission device based on TH precoder, the utility model discloses do not adopt the reverse precoder of TH at the receiving terminal, but adopt the input of matched filter's output lug connection equalizer, rethread constellation demapper, deinterleaver connect the channel decoder, the output of channel decoder and deinterleaver's output stack rethread receiving terminal interleaver and receiving terminal constellation mapper connect back equalizer to this kind of circuit structure realizes the soft iteration of information and detects, further eliminates in the former system a large amount of residual intersymbol and disturbs, improves transmission reliability.

The utility model discloses build FTN transmission equipment based on TH precoding scheme, cancelled the contrary precoder in traditional TH precoding scheme at the receiving terminal, and use channel equalizer and the Turbo circuit structure of iteration to replace, not only can solve the mould loss problem that the contrary precoder of TH brought, can further eliminate a large amount of remaining intersymbol of receiving terminal and crosstalk on the basis that does not increase the system complexity moreover, improve FTN transmission equipment's reliability, the practicality of the FTN transmission system of being convenient for.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

An object of the utility model is to provide a novel FTN transmission equipment based on TH precoder can effectively eliminate intersymbol interference among the FTN transmission system, reduces and realizes the complexity, guarantees the reliability of transmission simultaneously.

The utility model discloses a novel FTN transmission equipment based on TH precoder, the principle lies in: at a sending end, a TH precoder is adopted to eliminate intersymbol interference in an FTN transmission system, and the complexity of signal detection at a receiving end is reduced; at the receiving end, the input end of the equalizer is directly connected with the output end of the matched filter to replace the traditional TH inverse precoder, and the circuit modules of the equalizer, the constellation demapper, the deinterleaver, the channel decoder, the receiving end interleaver, the receiving end constellation demapper and the like adopt an iterative Turbo circuit structure to realize the soft iterative detection of information, thereby further eliminating a large amount of residual intersymbol interference of the receiving end, improving the reliability of FTN transmission, simultaneously ensuring the low realization complexity of the FTN transmission system and being beneficial to the practicability of the FTN transmission system.

This is described in further detail below in connection with the overall block diagram of the invention.

Example 1: as shown in fig. 1, the device of the present invention is arranged between a signal source 1 and a signal sink 12, and comprises a transmitting end and a receiving end, wherein the transmitting end comprises a channel encoder 2, a transmitting end interleaver 3, a transmitting end constellation mapper 4, a TH precoder 5 and a shaping filter 6 which are connected in sequence, the signal source 1 is connected with an input end of the channel encoder, the receiving end comprises a matching filter 7, a channel equalizer 8, a constellation demapper 9, a deinterleaver 10, a channel decoder 11, a receiving end interleaver 13 and a receiving end constellation demapper 14, a received signal of the receiving end is input into the input end of the matching filter 7, an output end of the matching filter 7 is connected with an input end of the channel equalizer 8, the constellation demapper 9, the deinterleaver 10, the channel decoder 11, the receiving end interleaver 13 and the receiving, the output of the channel decoder 11 is connected to a sink 12.

In the above embodiment, the channel encoder 2 preferably adopts (7,5)₈A channel encoder for a recursive systematic convolutional coding scheme.

In the above embodiment, each device of the transmitting end and the receiving end is an existing circuit device, the TH precoder is a nonlinear precoder, and the channel encoder, the interleaver, the constellation mapper, the filter, the equalizer, and the like are also existing communication devices, and the circuit implementation of the device is the prior art in the field and is not described in detail.

The above description is not intended to limit the present invention to the particular embodiments, but should be construed as broadly as possible, and all modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the invention.

Claims

1. The FTN transmission equipment based on the TH precoder is characterized by comprising a transmitting end and a receiving end, wherein the transmitting end comprises a channel encoder (2), a transmitting end interleaver (3), a transmitting end constellation mapper (4), the TH precoder (5) and a shaping filter (6) which are sequentially connected, an information source (1) is connected with the input end of the channel encoder, the receiving end comprises a matched filter (7), a channel equalizer (8), a constellation demapper (9), a deinterleaver (10), a channel decoder (11), a receiving end interleaver (13) and a receiving end constellation mapper (14), a received signal of the receiving end is input into the input end of the matched filter (7), the output end of the matched filter (7) is connected with the input end of the channel equalizer (8), the constellation demapper (9), the deinterleaver (10) and the shaping filter (, The channel decoder (11), the receiving end interleaver (13) and the receiving end constellation mapper (14) form a Turbo iterative equalization circuit structure, and the output end of the channel decoder (11) is connected to the information sink (12).

2. A TH precoder based FTN transmission device according to claim 1, wherein said channel coder (2) is of the type employing (7,5)₈A channel encoder for recursive systematic convolutional codes.

3. The FTN transmission device based on the TH precoder as claimed in claim 1, wherein the Turbo iterative equalization circuit structure is specifically: the channel equalizer (8), the constellation demapper (9), the deinterleaver (10) and the channel decoder (11) are sequentially connected, and the outputs of the deinterleaver (10) and the channel decoder (11) are superposed and then input into the receiving end interleaver (13), and then output to the input end of the channel equalizer (8) through the receiving end constellation mapper (14).