# US 12,004,164 B2 · NLOS wireless backhaul downlink communication

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- Number: US 12,004,164 B2
- Document ID: US12004164B2
- Status: Granted
- Kind: B2
- Application number: 18/118,019
- Filed: 2023-03-06
- Published: 2023-09-07
- Granted: 2024-06-04
- Earliest claimed: 2013-06-05
- Assignees: Texas Instruments Incorporated
- Applicants: Texas Instruments Incorporated
- Inventors: June Chul Roh; Pierre Bertrand; Srinath Hosur; Vijay Pothukuchi; Mohamed Farouk Mansour
- Web page: https://patentgrep.com/patent/US12004164B2

## CPC

- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H03M 13/1515: {Reed-Solomon codes}
- H03M 13/2966: {Turbo codes concatenated with another code, e.g. an outer block code}
- H03M 13/611: {Specific encoding aspects, e.g. encoding by means of decoding}
- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)}
- H04L 1/0061: {Error detection codes}
- H04L 1/0064: {Concatenated codes}
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04L 1/0076: {Distributed coding, e.g. network coding, involving channel coding (coding in both space and time H04L1/0618; cooperative diversity H04B7/022)}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H03M 13/618: {Shortening and extension of codes}
- H03M 13/635: {Error control coding in combination with rate matching}
- H04H 20/38: Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)

## Abstract

A method for communicating over a wireless backhaul channel comprising generating a radio frame comprising a plurality of time slots, wherein each time slot comprises a plurality of symbols in time and a plurality of sub-carriers in a system bandwidth, broadcasting a broadcast channel signal comprising a transmission schedule to a plurality of remote units in a number of consecutive sub-carriers centered about a direct current (DC) sub-carrier in at least one of the time slots in the radio frame regardless of the system bandwidth, and transmitting a downlink (DL) control channel signal and a DL data channel signal to a first of the remote units, wherein the DL data channel signal is transmitted by employing a single carrier block transmission scheme comprising a Discrete Fourier Transform (DFT) spreading for frequency diversity.

## Claims

### Claim 1

A wireless backhaul communication system, comprising:
a transmitter comprising:
a Reed Solomon (RS) encoder configured to perform RS encoding on a downlink (DL) data bit stream to generate a plurality of RS codewords;
a byte interleaver coupled to the RS encoder and configured to perform byte interleaving across the plurality of RS codewords;
a Turbo encoder coupled to the byte interleaver and configured to perform Turbo encoding on the interleaved RS codewords to generate one or more Turbo codewords, wherein each Turbo codeword is encoded from multiple RS codewords;
a symbol mapper coupled to the Turbo encoder and configured to modulate and Discrete Fourier Transform (DFT) precode the Turbo codewords, a transmission control frame, and a broadcast frame separately, wherein the broadcast frame comprises a transmission schedule for a plurality of wireless backhaul remote units; and
a sub-carrier mapper coupled to the symbol mapper and configured to generate a first digital radio frame comprising a plurality of symbols in time and a plurality of sub-carriers in a system bandwidth, wherein to generate the first digital radio frame, the sub-carrier mapper is to:
map the DFT precoded broadcast frame onto a first set of the sub-carriers centered about a direct current (DC) sub-carrier, wherein the first set of sub-carriers comprises a fixed number of consecutive sub-carriers regardless of the system bandwidth;
map the DFT precoded transmission control frame onto a second set of the sub-carriers near a lower frequency edge and near a higher frequency edge of the system bandwidth; and
map the DFT precoded Turbo codewords onto frequency sub-carriers different than the first set of sub-carriers and the second set of sub-carriers; and
a radio front end comprising an antenna and coupled to the transmitter, wherein the radio front end is configured to convert the first digital radio frame to a first analog signal and transmit the first analog signal via the antenna.

### Claim 2 (depends on 1)

The system of claim 1, wherein the transmitter further comprises a pilot sequence (PS) generator configured to generate a PS sequence and time multiplex the PS sequence with the DFT precoded broadcast frame, the DFT precoded transmission control frame, and the DFT precoded Turbo codewords, wherein the sub-carrier mapper is further configured to map the PS sequence onto all sub-carriers in the system bandwidth, and wherein the PS sequence provides channel estimation capabilities in the system bandwidth.

### Claim 3 (depends on 1)

The system of claim 1, wherein the transmitter further comprises a synchronization sequence (SS) generator configured to generate a SS sequence and time multiplex the SS sequence with the DFT precoded broadcast frame, the DFT precoded transmission control frame, and the DFT precoded Turbo codewords, wherein the sub-carrier mapper is further configured to map the SS sequence onto a set of sub-carriers spanning a same frequency band as the first set of sub-carriers, and wherein the SS sequence comprises a random Constant Amplitude Zero Auto-Correlation (CAZAC) sequence to provide signal detection capabilities against a carrier frequency offset.