# US 9,882,758 B2 · Receiver and FBMC reception method with low decoding latency

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- Number: US 9,882,758 B2
- Document ID: US9882758B2
- Status: Granted
- Kind: B2
- Application number: 15/094,200
- Filed: 2016-04-08
- Published: 2016-10-13
- Granted: 2018-01-30
- Earliest claimed: 2015-04-10
- Assignees: Commissariat A L'energie Atomique Et Aux Energies Alternatives
- Applicants: Commissariat A L'Energie Atomique et aux Energies Alternatives
- Inventors: Jean-Baptiste Dore
- Web page: https://patentgrep.com/patent/US9882758B2

## CPC

- H04L 27/2654: {Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]}
- H04B 1/16: Circuits
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

The invention relates to a receiver and a FBMC reception method making it possible to reduce the decoding latency time and to increase the data rate in a communication system using a handshake exchange protocol or a TDMA access protocol. The receiver introduces zero padding values in place of the last samples of the last block of samples of a FBMC packet, without waiting for the end of this packet. The decoding of the FBMC packet is thus decoded more rapidly, without significant degradation of the error rate and without reduction of the out-of-band rejection rate of the FBMC signal.

## Claims

### Claim 1

A filter bank multi-carrier (FBMC) receiver configured to receive at least one packet of FBMC symbols N K, the receiver comprising:
a sampler to sample at the frequency Nf a FBMC packet received in baseband, the FBMC symbols in the received FBMC packet being transmitted with a plurality N of frequency sub-channels and following one another at a frequent f=1/T with an overlapping factor K, where T is a symbol duration;
a serial-parallel converter to form blocks of successive samples of size KN, a fast Fourier transformation (FFT) module to carry out a FFT of size KN on each of said blocks;
a battery of analysis filters to carry out a filtering and a spectral despreading on frequency components at the output of the FFT module; and
a first multiplexer to pad with zero values a first plurality (Mz) of last samples of a last block of the FBMC packet at the input of the FFT module, without waiting for an end of reception of the FBMC packet.

### Claim 2 (depends on 1)

The FBMC receiver according to claim 1, wherein the overlapping factor is equal to 4 and a first plurality of samples is equal to KN/3 to within 10%.

### Claim 3 (depends on 1)

The FBMC receiver according to claim 1, further comprising a second multiplexer at the input of the FFT module to pad with zero values a second plurality of first samples of a first block of the FBMC packet.

### Claim 4 (depends on 1)

The FBMC receiver according to claim 1, wherein the overlapping factor is equal to 4 and a second plurality of samples is equal to KN/3 to within 10%.

### Claim 5 (depends on 1)

The FBMC receiver according to claim 1, wherein the receiver is configured to analyse multicarrier signals, including the FBMC packet, based on an analysis filter bank including frequency shifted versions of a prototype filter.

### Claim 6

A method of receiving at least one packet of filter bank multi-carrier (FBMC) symbols, N K said method comprising:
sampling at the frequency Nf of a FBMC packet received in baseband, the FBMC symbols of the received FBMC packet being transmitted with a plurality N of frequency sub-channels and following one another at a frequency f=1/T with an overlapping factor K, where T is a symbol duration;
a serial-parallel conversion to form blocks of successive samples of size KN, a FFT of size KN on each of said blocks thereby obtained;
a filtering and a spectral despreading, in the frequency domain, of frequency components at the output of the fast Fourier transformation (FFT); and
prior to the FFT, a first step of padding with zero values a first plurality (Mz) of last samples of a last block of the FBMC packet, the step of padding being carried out without waiting for an end of reception of the FBMC packet.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the overlapping factor is equal to 4 and said first plurality of samples is equal to KN/3 to within 10%.

### Claim 8 (depends on 6)

The method according to claim 6, further comprising, prior to the FFT, a second step of padding with zero values a second plurality of first samples of a first block of the FBMC packet.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the overlapping factor is equal to 4 and the second plurality of samples is equal to KN/3 to within 10% .

### Claim 10 (depends on 5)

The method according to claim 5, comprising an equalization of the frequency components prior to the step of filtering and spectral despreading.

### Claim 11 (depends on 6)

The method according to claim 6, comprising an offset modulation demodulation after the step of filtering and spectral despreading.

### Claim 12 (depends on 6)

The method according to claim 6, said method comprising analysing multicarrier signals, including the FBMC packet, based on an analysis filter bank including frequency shifted versions of a prototype filter.