# US 2018/0076916 A1 · System and method for ofdm symbol interleaving

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- Number: US 2018/0076916 A1
- Document ID: US20180076916A1
- Status: Published application
- Kind: A1
- Application number: 15/796,857
- Filed: 2017-10-30
- Published: 2018-03-15
- Earliest claimed: 2014-07-03
- Assignees: Technion Research & Development
- Applicants: Technion research & Development Ltd.
- Inventors: Moshe Nazarathy; Amitay Bar; Aviv Shalom; Igor Tselniker
- Web page: https://patentgrep.com/patent/US20180076916A1

## CPC

- H04J 11/0023: {Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541)}
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04L 7/0016: {correction of synchronization errors}
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04L 27/26416: {Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]}
- H04L 27/26526: {with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04L 5/003: {Arrangements for allocating sub-channels of the transmission path}
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An orthogonal frequency division multiplexing (OFDM) transmitter that includes an encoder, an interleaver, a symbol processor; and a transmission module; wherein the encoder is configured to encode a superframe to provide an encoded superframe; wherein the encoded superframe comprises a sequence of encoded frames; wherein the interleaver is configured to allocate multiple frequency sub-bands to each encoded frame of the encoded superframe by assigning adjacent frequency sub-bands to successive symbols of each encoded frame; wherein the symbol processor is configured to generate, for each encoded frame and according to the assignment of the multiple frequency sub-bands, an intermediate set of symbols; and wherein the transmission module is configured to transmit simultaneously, for each encoded frame, OFDM symbols that represents the intermediate set of symbols.

## Claims

### Claim 1

An orthogonal frequency division multiplexing (OFDM) receiver, comprising: a decoder, a de-interleaver, a symbol processor; and a reception module; wherein the reception module is configured to receive OFDM symbols representative of an encoded superframe that comprises multiple encoded frames; wherein the symbol processor is configured to generate, in response to OFDM symbols associated with each encoded frame, all received symbols that are associated with the encoded frame; wherein adjacent symbols of each encoded frame are represented by OFDM symbols that belong to adjacent sub-bands; wherein the de-interleaver is configured to de-interleave all received symbols that are associated with each encoded frame to provide the encoded superframe; and wherein the decoder is configured to decode the encoded superframe to provide a decoded superframe.

### Claim 2

A method for receiving orthogonal frequency division multiplexing (OFDM) signals, comprising receiving OFDM symbols representative of an encoded superframe that may include multiple encoded frames; generating, in response to OFDM symbols associated with each encoded frame, all received symbols that are associated with the encoded frame; wherein adjacent symbols of each encoded frame are represented by OFDM symbols that belong to adjacent sub-bands; de-interleaving all received symbols that are associated with each encoded frame to provide the encoded superframe; and decoding the encoded superframe to provide a decoded superframe.