Method of transmitting pilot bits in a wireless communication system

• US 9,369,326 B2
• Filed: 03/19/2015
• Issued: 06/14/2016
• Est. Priority Date: 06/15/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hak Seong, Kim, Bong Hoe, Roh, Dong Wook, Ahn, Joon Kui, Seo, Dong Youn, Lee, Jung Hoon
• Primary Examiner(s): Louis, Vincelas
• Application Number:
  US14/663,163
• Publication Number:
  US 20150200798A1
• Time in Patent Office: 453 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/2637 with direct modulation of individual subcarriers
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00

Abstract

A method of allocating pilot bits in a wireless communication system using a multiple carrier modulation (MCM) is disclosed. The method includes allocating a plurality of precoded data symbols precoded by a precoding matrix module and a plurality of non-precoded pilot bits to a plurality of subcarriers, and transmitting the allocated precoded data symbols and the allocated non-precoded pilot bits.

Claims

1. A method of transmitting pilot signals at a terminal in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising:

applying transform precoding only to a plurality of data symbols by a transform precoder of the terminal;

allocating the plurality of data symbols to a first plurality of subcarriers and allocating a plurality of pilot signals to a second plurality of subcarriers, wherein the plurality of pilot signals are not transform precoded by the terminal;

transmitting, at a first point of time, a first non-precoded plurality of pilot signals without the precoded plurality of data, wherein the first non-precoded plurality of pilot signals are allocated to locations that are reserved as locations to which the precoded plurality of data symbols are not allocated;

transmitting, at a second point of time, the precoded plurality of data symbols without the first non-precoded plurality of pilot signals, wherein a receiver performs channel estimation for the precoded plurality of data symbols based on the first non-precoded plurality of pilot signals that are not transmitted at the second point of time; and

transmitting, at a third point of time, both the precoded plurality of data symbols and a second non-precoded plurality of pilot signals.

2. The method according to claim 1, wherein the first non-precoded plurality of pilot signals are allocated by a symbol-to-subcarrier mapping module, and wherein both the precoded plurality of data symbols and the second non-precoded plurality of pilot signals are allocated by the symbol-to-subcarrier mapping module.

3. The method according to claim 1, wherein applying the transform precoding comprises:

using a Discrete Fourier Transform (DFT) scheme.

4. A terminal transmitting pilot signals in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the terminal comprising:

a Radio Frequency (RF) module; and

a processor configured to;

control the RF module;

apply transform precoding only to a plurality of data symbols by a transform precoder of the terminal;

allocate the plurality of data symbols to a first plurality of subcarriers and allocating a plurality of pilot signals to a second plurality of subcarriers, wherein the plurality of pilot signals are not transform precoded by the terminal;

transmit, at a first point of time, a first non-precoded plurality of pilot signals without the precoded plurality of data, wherein the first non-precoded plurality of pilot signals are allocated to locations that are reserved as locations to which the precoded plurality of data symbols are not allocated;

transmit, at a second point of time, the precoded plurality of data symbols without the first non-precoded plurality of pilot signals, wherein a receiver performs channel estimation for the precoded plurality of data symbols based on the first non-precoded plurality of pilot signals that are not transmitted at the second point of time; and

transmit, at a third point of time, both the precoded plurality of data symbols and a second non-precoded plurality of pilot signals.

5. The terminal according to claim 4, wherein the first non-precoded plurality of pilot signals are allocated by a symbol-to-subcarrier mapping module, and wherein both the precoded plurality of data symbols and the second non-precoded plurality of pilot signals are allocated by the symbol-to-subcarrier mapping module.

6. The terminal according to claim 4, wherein the processor is further configured to apply the transform precoding using a Discrete Fourier Transform (DFT) scheme.