# US 2016/0366002 A1 · Transmitters, receivers and methods of transmitting and receiving

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- Number: US 2016/0366002 A1
- Document ID: US20160366002A1
- Status: Published application
- Kind: A1
- Application number: 15/245,263
- Filed: 2016-08-24
- Published: 2016-12-15
- Earliest claimed: 2013-03-13
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Gholam Hosein ASJADI
- Web page: https://patentgrep.com/patent/US20160366002A1

## CPC

- H04L 27/265: {Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators (H04L27/26524 takes precedence)}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 25/0226: {sounding signals per se}
- H04L 27/2601: {Multicarrier modulation systems}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)}
- H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length}
- H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)}
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04L 27/26134: {Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain}
- H04L 27/2626: {Arrangements specific to the transmitter only}
- H04L 27/2627: {Modulators}
- H04L 27/2671: {Time domain}
- H04L 27/2672: {Frequency domain}
- H04L 27/2675: {Pilot or known symbols}
- H04L 2025/03414: {Multicarrier}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The receiver comprises a demodulator configured to detect a signal representing the OFDM symbols and to generate a sampled digital version of the OFDM symbols in the time domain. A Fourier transform processor is configured to receive the time domain digital version of the OFDM symbols and to form a frequency domain version of the OFDM symbols, from which the pilot symbol bearing sub-carriers and the data symbol bearing sub-carriers can be recovered. A detector is configured to recover the data symbols from the data bearing sub-carriers of the OFDM symbols and to recover the pilot symbols from the pilot bearing sub-carriers of the OFDM symbols in accordance with the continuous pilot symbol pattern. The continuous pilot symbols are present at the same sub-carrier locations in first OFDM symbols and as second OFDM symbols. A transmitter is also provided.

## Claims

### Claim 1

A receiver configured to recovering data from Orthogonal Frequency Division Multiplexed (OFDM) symbols,
wherein the OFDM symbols include a plurality of sub-carrier signals, some of the sub-carrier signals carrying data symbols and some of the sub-carrier signals carrying pilot symbols, the pilot symbols comprising continuous pilot symbols, the continuous pilot symbols being distributed across the sub-carrier signals in accordance with a continuous pilot symbol pattern, the receiver comprising:
a demodulator configured to detect a signal representing the OFDM symbols, and to generate a sampled digital version of the OFDM symbols in the time domain,
a Fourier transform processor configured to receive the time domain digital version of the OFDM symbols and to form a frequency domain version of the OFDM symbols, from which the pilot symbol bearing sub-carriers and the data symbol bearing sub-carriers can be recovered, and
a detector configured to recover the data symbols from the data bearing sub-carrier signals of the OFDM symbols and to recover the pilot symbols from the pilot bearing sub-carrier signals of the OFDM symbols, wherein the detector comprises a memory configured to store data relating to a pilot pattern and a processor configured to detect the number of sub-carrier signals in the plurality of sub-carrier signals and to derive the continuous pilot pattern from the pilot pattern data based on the number of sub-carrier signals, and the OFDM symbols comprise
first OFDM symbols, which include a first number of sub-carriers signals, and
second OFDM symbols, which include a second number of sub-carrier signals, the second number of second sub-carrier signals being the same or greater than the first number of sub-carrier signals, wherein the continuous pilot symbols is present at the same sub-carrier locations in the first OFDM symbols and the second OFDM symbols.