Signal sending and receiving method and apparatus based on filtering in carrier modulation system

Abstract

The invention provides a signal sending method based on filtering in a carrier modulation system. The method comprises the following steps: for each sub-band of an available frequency band in the system, a transmitter determines a reference signal pattern of the sub-band and sends the information of the reference signal pattern to a receiver; the transmitter inserts a reference signal in the corresponding time-frequency resource according to the reference signal pattern of each sub-band, and performs carrier modulation and time domain filtering processing on a data signal and the reference signal, and sends processing results of sub-band signals, wherein the reference signal is used for estimating the frequency response of an equivalent channel of a physical channel from a time domain filter and the transmitter to the receiver. The invention further provides a receiving method, a transmitter and a receiver. By adoption of the signal sending method, the storage demands and the detection complexity of the receiver can be greatly reduced.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a signal sending method, a receiving method and a device thereof in a filter-based carrier modulation system. Background technique [0002] With the rapid development of the information industry, especially the growing demand from the mobile Internet and the Internet of Things (IoT, internet of things), it brings unprecedented challenges 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 by nearly 1,000 times compared to 2010 (4G era), and the number of user equipment connections will also increase. It will exceed 17 billion. As massive IoT devices gradually penetrate into mobile communication networks, the number of connected devices will become even more astoni...

AI Technical Summary

Problems solved by technology

Although the modulation waveform based on CP-OFDM can well support the mobile broadband (MBB) service requirements in the 4G era, but because 5G will face more challenging and richer scenarios, this makes CP-OFDM more effective in 5G scenarios. There are great limitations or deficiencies, mainly in: (1) Adding CP to resist ISI in 5G low-latency transmission scenarios will greatly reduce spectrum utilization, because low-latency transmission will greatly shorten OFDM symbol length, and the length of the CP is only subject to the impulse response of the channel, then the ratio of the length of the CP to the length of the OFDM symbol will be greatly increased. Such overhead causes a very large loss of spectral efficiency, which 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 (Rectangular Pulse) to make its sidelobe roll-off in the frequency domain very slow, resulting in a large out-of-band leakage

Since the design of the time-domain filter is related to the sub-band bandwidth, different time-domain filters need to be designed for different sub-band bandwidths, which increases the resources required for time-domain filter storage and the complexity of the channel estimation algorithm. It is not conducive to the application of low-complexity devices in IoT scenarios or machine type communication (Machine Type Communication, MTC) scenarios

[0006] To sum up, in order to enhance the competitiveness of F-OFDM in 5G candidate technologies, in addition to developing its advantages and characteristics, we also need to solve its own shortcomings, aiming at various scenarios in 5G, especially narrowband services in IoT scenarios Transmission and other modes, it is very necessary to use effective methods to solve the problems of large storage requirements and complicated channel estimation caused by the time domain filter in F-OFDM

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