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A Method of PAPR Reduction by Phase Rotation for Carrier Aggregated OFDMA and SC-FDMA Systems

IP.com Disclosure Number: IPCOM000208368D
Publication Date: 2011-Jul-06
Document File: 20 page(s) / 9M

Publishing Venue

The IP.com Prior Art Database

Related People

Jeremy J. Tucker: ATTORNEY

Related Documents

61/360,582: PATAPP

Abstract

Wireless communications, carrier aggregation, cellular systems, PAPR, OFDMA, SC-FDMA

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1. TITLE OF THE INVENTION

A Method of PAPR Reduction by Phase Rotation for Carrier Aggregated OFDMA and SC-FDMA Systems

2. INVENTOR(S) INFORMATION

Chia-Chin Chong

Hlaing

Minn

3. FIELD OF THE INVENTION

Wireless communications, carrier aggregation, cellular systems, PAPR, OFDMA, SC-FDMA

4. BACKGROUND OF THE INVENTION

The next generation cellular systems need to support higher data rates in order to meet the demand of new and enhanced broadband services. In the second generation (2G) cellular systems, the typical data rates is 128 kbps while for the third generation (3G) systems data rates increased to 7.2 Mbps for High-Speed Downlink Packet Access (HSDPA) and even up to 326.4 Mbps for enhanced version for 3G systems like Long Term Evolution (LTE). Recently, the IMT-Advanced system requirements specify up to 1 Gbps of data rate for environments with low mobility. Supporting higher data rates requires larger bandwidths. For instance, 2G systems bandwidth is 200 kHz while LTE systems bandwidth is up to 20 MHz. In order to achieve up to 1 Gbps peak data rate in IMT-Advanced mobile systems, the concept of carrier aggregation (CA)[1] is introduced by the 3GPP in order to support very high data rate transmissions over wide frequency bandwidths (e.g., up to 100 MHz) in its new LTE-Advanced standards. The idea of CA is to deploy several LTE carrier components (CCs), which could be contiguous and/or non-contiguous in spectral domain, and are aggregated in order to provide the targeted data rate. One of the technical challenges for implementing CA technique in LTE-Advanced systems is the backward compatibility requirement with the current LTE systems, i.e., each CC should be compatible with LTE. Furthermore, it is always difficult to obtain a large contiguous chunk of spectrum in the cellular band. The other drawback of deploying CA is the increase of the peak-to-average power ratio (PAPR) of the time domain signal. Signal with large PAPR will experience non-linear distortions at the transmit power amplifier, resulting in in-band distortion and out-of-band radiation. These can cause performance degradation, interference to other systems, energy inefficiency, reduced cell coverage, and system capacity loss. Hence, PAPR control is an important practical issue for carrier aggregated systems. Since the concept of CA was first discussed in late 2007, limited amount of technical solutions are available in the literatures, which are summarized below.

In [1], a method for communication includes modulating data in a wireless communication terminal to produce an aggregated-spectrum signal, which includes at least first and second signals in respective first and second spectral bands. This invention focusing on methods and systems for power control in carrier aggregated wireless communication systems such as the LTE-Advanced systems.

In [2], methods and apparatus for generating and determining multi-component carrier cells, without the use of neighbor-cell lists, ar...