Wave filtration based signal transmitting and receiving method and corresponding transmitter and receiver

Abstract

The present invention provides a filtering-based signal transmission method, comprising: a transmitter performs carrier modulation on signals from one or more sub-bands, and adds a cyclic prefix and a cyclic suffix respectively; adding a cyclic prefix and a cyclic suffix to each sub-band The suffixed signal is time-domain filtered; and the filtered signal of one or more subbands is transmitted. The present invention also provides a filter-based signal receiving method, including: the receiver performs time-domain matched filtering on the received signal corresponding to one or more sub-bands; Prefix and cyclic suffix, and respectively carry out carrier demodulation; detect and estimate the demodulated signal of one or more subbands. The invention eliminates most of the inter-symbol interference from adjacent symbols and improves the link reliability of the system.

Description

technical field [0001] The present invention relates to the field of mobile communication, specifically, the present invention relates to a filtering-based signal sending method, a filtering-based signal receiving method, a corresponding filtering-based transmitter and receiver, and a signal adjustment-based communication method. Background technique [0002] With the rapid development of the information industry, especially the growing demand from the mobile Internet and IoT (internet of things, Internet of Things), unprecedented challenges are brought to future mobile communication technologies. For example, according to the report ITU-R M.[IMT.BEYOND 2020.TRAFFIC] of the International Telecommunication Union ITU, it can be predicted that by 2020, the growth of mobile traffic will increase nearly 1,000 times compared to 2010, that is, the 4G era, and the number of user equipment connections It will also exceed 17 billion. As a large number of IoT devices gradually penetra...

AI Technical Summary

Problems solved by technology

[0004] However, since 5G will face more challenging and richer scenarios, this makes CP-OFDM have great limitations or shortcomings in 5G application scenarios, mainly in: (1) Adding CP to resist ISI in 5G The low-latency transmission scenario will greatly reduce the spectrum utilization, because the low-latency transmission will greatly shorten the OFDM symbol length, and the length of the CP is only subject to the impulse response of the channel, so the length of the CP and the OFDM symbol length The ratio of will be greatly increased, such an overhead will cause a very large loss of spectrum efficiency, and the low spectrum utilization rate is unacceptable

(2) Strict time synchronization requirements will cause a lot of signaling overhead required for closed-loop synchronization maintenance in 5G IoT scenarios, and the strict synchronization mechanism makes the data frame structure inelastic, which cannot well support multiple services Different Synchronization Requirements

(3) OFDM uses rectangular pulse shaping to make its frequency domain sidelobe roll off very slowly, resulting in a large out-of-band leakage

This will lead to inter-symbol interference between adjacent symbols, thereby degrading the bit error performance of the system

Although the influence of this problem can be reduced by concentrating the energy of the filter within a certain range through the design of the time domain filter, in some scenarios, for example, when the subband width is narrow, or the modulation order of the symbol modulation method used When the number is high, the inter-symbol interference caused by the time-domain symbol extension caused by filtering will be difficult to ignore, and even lead to a bit error platform

[0007] To sum up, in order to enhance the competitiveness of F-OFDM in 5G candidate technologies, in addition to developing its advantages and characteristics, it is also necessary to solve its own shortcomings, aiming at various scenarios in 5G, especially narrowband service transmission in IoT scenarios It is very necessary to use an effective method to solve the problem of inter-symbol interference caused by the symbol extension caused by F-OFDM time-domain filtering to the wireless communication system.

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