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Hybrid waveform design combining OFDM and cyclic prefix-based single carrier for mmWave wireless communications

A cyclic prefix, wireless communication technology, applied in the modulation carrier system, pilot signal allocation, multiple use of transmission paths, etc., can solve problems such as high carrier frequency offset, large peak-to-average power ratio, and amplifier nonlinear intolerance.

Active Publication Date: 2020-10-16
QUALCOMM INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, although OFDM-based transmission has become the physical layer for broadband communications, it suffers from drawbacks including large peak-to-average power ratio (PAPR), intolerance to amplifier nonlinearity, and tolerance to carrier frequency offset higher sensitivity of
While both OFDM and SC modulation techniques offer certain unique advantages, each suffers from inherent disadvantages that negatively impact the performance of the wireless channel with respect to channel estimation and data transfer

Method used

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  • Hybrid waveform design combining OFDM and cyclic prefix-based single carrier for mmWave wireless communications
  • Hybrid waveform design combining OFDM and cyclic prefix-based single carrier for mmWave wireless communications
  • Hybrid waveform design combining OFDM and cyclic prefix-based single carrier for mmWave wireless communications

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Embodiment Construction

[0031] In certain embodiments, a transmitting device (e.g., a base station and / or a mobile device) may employ OFDM processing techniques to periodically transmit a known first pilot symbol during a first time period and employ a cyclic prefix-based single carrier (CP - SC) processing technique to transmit data packets during the second time period. In some examples, channel estimation is based on a block-type pilot arrangement, where pilot symbols can be inserted into all subcarriers of a block of OFDM symbols within a certain time period. Based in part on such pilot symbols, receiving devices can be configured to estimate CSI and provide reliable data detection. In another example of the present disclosure, scattered pilot symbols may be interleaved (multiplexed) with data packets based on CP-SC processing techniques. Scattered pilot symbols may allow a receiving device to track channel conditions after an initial estimate based on known first pilot symbols. In some embodim...

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Abstract

Methods, systems, and / or devices for generating hybrid waveforms for data transmission between a transmitting device and a receiving device are described herein. The transmitting device may employ OFDM processing techniques to periodically transmit known first pilot symbols mapped from a signal constellation in which each signal has equal energy and employ cyclic prefix-based A single carrier (CP-SC) processing technique to transmit data packets and a known second pilot symbol during a second time period. Channel estimation is based on first pilot symbols inserted into all subcarriers of an OFDM symbol block within a certain time period. Channel estimation tracking is based on the second pilot symbols interleaved within the data packet. The receiving device may be configured to estimate the CSI based on the first pilot symbols and track the channel estimate based on the second pilot symbols in order to provide reliable data detection.

Description

[0001] cross reference [0002] This patent application claims U.S. Patent entitled "HybridWaveform Design Combining OFDM and Cyclic Prefix Based Single Carrier for Millimeter-Wave Wireless Communication" filed April 1, 2014 by Zhao et al. and assigned to its assignee Benefit of Application No. 14 / 242,609. Background technique [0003] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, and broadcast, among others. These systems may be multiple-access systems that can support communication with multiple users by sharing available system resources (eg, time, frequency, and power). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems. Wireless local area networks (WLANs) such as ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L27/26
CPCH04L27/0006H04L27/2613H04L27/2636H04L27/26134H04L5/0048H04L27/26132H04L27/2607
Inventor 赵渌J·蒙托霍C·皮奇
Owner QUALCOMM INC