专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US07535950B2 Blind selected mapping techniques for crest factor reduction of forward link CDMA signals 失效
标题翻译：盲目选择的前向链路CDMA信号波峰因数降低的映射技术
公开(公告)号：US07535950B2
公开(公告)日：2009-05-19
申请号：US11301381
申请日：2005-12-12
申请人： Ning Chen , Guotong Zhou
发明人： Ning Chen , Guotong Zhou
IPC分类号： H04B1/69 , H04B7/216
CPC分类号： H04B1/707 , H04B2201/70706
摘要： Disclosed are apparatus that implement blind selected mapping techniques that provide for crest factor reduction of forward link CDMA signals. Communication signals are processed using a mathematical algorithm that selectively maps a summed communication signal in a frame to another summed communication signal which has a smaller peak-to-average power ratio. The reduced dynamic range communication signal is amplified and transmitted to a receiver. At the receiver, the reduced power communication signal is processed using a mathematical algorithm that detects the selected mapping index used in the transmitter and converts the received signals into the original communication signals.
摘要翻译：公开了实现盲目选择的映射技术的设备，其提供前向链路CDMA信号的波峰因数降低。使用选择性地将帧中的相加的通信信号映射到具有较小峰值与平均功率比的另一个相加的通信信号的数学算法来处理通信信号。减小的动态范围通信信号被放大并发送到接收机。在接收机处，使用检测发射机中使用的选择的映射索引的数学算法来处理降低功率的通信信号，并将接收的信号转换成原始的通信信号。

2. 发明授权

US07668266B2 Crest factor reduction in OFDM using blind selected pilot tone modulation 失效
标题翻译：使用盲选择导频音调制的OFDM中的波峰因数降低
公开(公告)号：US07668266B2
公开(公告)日：2010-02-23
申请号：US11374704
申请日：2006-03-14
申请人： Ning Chen , Guotong Zhou
发明人： Ning Chen , Guotong Zhou
IPC分类号： H04L1/02
CPC分类号： H04L27/262
摘要： Orthogonal frequency division multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels, but has low power efficiency. OFDM signals have large crest factors, or peak-to-average power ratios (PARs) which lead to power inefficiency in the RF portion of the transmitter. Selected mapping can be used to reduce the PAR of an OFDM signal and is distortionless. A technique is disclosed that links the index of a phase rotation sequence used in selected mapping to the location of pilot tones that are used to estimate the channel. Each pilot tone location-phase sequence selection produces a different PAR value for the time-domain OFDM signal, and the signal with the lowest PAR value is transmitted. The technique is “blind” in that the optimum pilot tone location-phase sequence index is not transmitted as side information. A technique to blindly detect the optimum index at the receiver is also disclosed.
摘要翻译：正交频分复用（OFDM）是一种用于多径衰落信道上的高速数据传输的频谱效率高的多载波调制技术，但功率效率低。 OFDM信号具有较大的波峰因数或峰值与平均功率比（PAR），这导致发射机RF部分的功率效率低下。选择的映射可以用于减少OFDM信号的PAR并且是无失真的。公开了将选择的映射中使用的相位旋转序列的索引链接到用于估计信道的导频音调的位置的技术。每个导频音位置相位序列选择产生时域OFDM信号的不同的PAR值，并且发送具有最低PAR值的信号。该技术是“盲”的，因为最佳导频音位置相位序列索引不作为辅助信息发送。还公开了盲目检测接收机的最佳指标的技术。

3. 发明申请

US20060274868A1 Crest factor reduction in OFDM using blind selected pilot tone modulation 失效
标题翻译：使用盲选择导频音调制的OFDM中的波峰因数降低
公开(公告)号：US20060274868A1
公开(公告)日：2006-12-07
申请号：US11374704
申请日：2006-03-14
申请人： Ning Chen , Guotong Zhou
发明人： Ning Chen , Guotong Zhou
IPC分类号： H04L1/02
CPC分类号： H04L27/262
摘要： Orthogonal frequency division multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels, but has low power efficiency. OFDM signals have large crest factors, or peak-to-average power ratios (PARs) which lead to power inefficiency in the RF portion of the transmitter. Selected mapping can be used to reduce the PAR of an OFDM signal and is distortionless. A technique is disclosed that links the index of a phase rotation sequence used in selected mapping to the location of pilot tones that are used to estimate the channel. Each pilot tone location—phase sequence selection produces a different PAR value for the time-domain OFDM signal, and the signal with the lowest PAR value is transmitted. The technique is “blind” in that the optimum pilot tone location—phase sequence index is not transmitted as side information. A technique to blindly detect the optimum index at the receiver is also disclosed.
摘要翻译：正交频分复用（OFDM）是一种用于多径衰落信道上的高速数据传输的频谱效率高的多载波调制技术，但功率效率低。 OFDM信号具有较大的波峰因数或峰值与平均功率比（PAR），这导致发射机RF部分的功率效率低下。选择的映射可以用于减少OFDM信号的PAR并且是无失真的。公开了将选择的映射中使用的相位旋转序列的索引链接到用于估计信道的导频音调的位置的技术。每个导频音位置相位序列选择产生时域OFDM信号的不同的PAR值，并且发送具有最低PAR值的信号。该技术是“盲”的，因为最佳导频音位置相位序列索引不作为辅助信息发送。还公开了盲目检测接收机的最佳指标的技术。

4. 发明申请

US20060215732A1 Blind selected mapping techniques for crest factor reduction of forward link CDMA signals 失效
公开(公告)号：US20060215732A1
公开(公告)日：2006-09-28
申请号：US11301381
申请日：2005-12-12
申请人： Ning Chen , Guotong Zhou
发明人： Ning Chen , Guotong Zhou
IPC分类号： H04B1/707
CPC分类号： H04B1/707 , H04B2201/70706
摘要： Disclosed are apparatus that implement blind selected mapping techniques that provide for crest factor reduction of forward link CDMA signals. Communication signals are processed using a mathematical algorithm that selectively maps a summed communication signal in a frame to another summed communication signal which has a smaller peak-to-average power ratio. The reduced dynamic range communication signal is amplified and transmitted to a receiver. At the receiver, the reduced power communication signal is processed using a mathematical algorithm that detects the selected mapping index used in the transmitter and converts the received signals into the original communication signals.

5. 发明授权

US07769093B2 Blind selected mapping for peak-to-average power ratio reduction in OFDM with PSK input 失效
公开(公告)号：US07769093B2
公开(公告)日：2010-08-03
申请号：US11487566
申请日：2006-07-14
申请人： Guotong Zhou
发明人： Guotong Zhou
IPC分类号： H04K1/10
CPC分类号： H04L27/2618 , H04L5/0094
摘要： Orthogonal frequency division multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels, but has low power efficiency. OFDM signals have large crest factors, or peak-to-average power ratios (PARs) which lead to power inefficiency in the RF portion of the transmitter. Selected mapping (SLM) is a distortionless technique that has good PAR reduction capability. However, the biggest limitation of SLM is the need to transmit side information. Disclosed is a technique or algorithm using constant modulus (i.e., phase shift keying, PSK) inputs that implements SLM without having to transmit any side information and without causing any distortion.

6. 发明申请

US20100166086A1 Blind selected mapping for peak-to-average power ratio reduction in OFDM with PSK input 失效
标题翻译：使用PSK输入的盲区选择的峰均功率比降低的映射
公开(公告)号：US20100166086A1
公开(公告)日：2010-07-01
申请号：US11487566
申请日：2006-07-14
申请人： Guotong Zhou
发明人： Guotong Zhou
IPC分类号： H04L27/00
CPC分类号： H04L27/2618 , H04L5/0094
摘要： Orthogonal frequency division multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels, but has low power efficiency. OFDM signals have large crest factors, or peak-to-average power ratios (PARs) which lead to power inefficiency in the RF portion of the transmitter. Selected mapping (SLM) is a distortionless technique that has good PAR reduction capability. However, the biggest limitation of SLM is the need to transmit side information. Disclosed is a technique or algorithm using constant modulus (i.e., phase shift keying, PSK) inputs that implements SLM without having to transmit any side information and without causing any distortion.
摘要翻译：正交频分复用（OFDM）是一种用于多径衰落信道上的高速数据传输的频谱效率高的多载波调制技术，但功率效率低。 OFDM信号具有较大的波峰因数或峰值与平均功率比（PAR），这导致发射机RF部分的功率效率低下。选择映射（SLM）是具有良好的PAR降低能力的无失真技术。然而，SLM的最大限制是需要传输边信息。公开了使用恒定模数（即，相移键控，PSK）输入的技术或算法，其实现SLM而不必发送任何副信息并且不引起任何失真。

7. 发明授权

US07944991B2 Constrained clipping for peak-to-average power ratio (crest factor) reduction in multicarrier transmission systems 有权
标题翻译：多载波传输系统的峰均功率比（波峰因数）的约束削波
公开(公告)号：US07944991B2
公开(公告)日：2011-05-17
申请号：US11588009
申请日：2006-12-11
申请人： Chunming Zhao , Robert J. Baxley , Guotong Zhou
发明人： Chunming Zhao , Robert J. Baxley , Guotong Zhou
IPC分类号： H04K1/02
CPC分类号： H04L27/2623
摘要： Disclosed is a constrained clipping technique for reducing the peak-to-average power ratio (PAR) or crest factor of a multicarrier communications signal. This is a transmitter-side processing technique that does not impose any modification at the receiver. Constrained clipping achieves PAR reduction while simultaneously satisfying spectral mask and error vector magnitude (EVM) constraints that are specified by most modern communications standards. The constrained clipping technique includes two independent processing units, one to satisfy an in-band EVM constraint and the other to satisfy an out-of-band spectral constraint. Achievable PAR reduction results vary depending on a particular standard's requirements, but by using constrained clipping on a QPSK WiMax signal with 256 subcarriers, for example, a 4.5 dB PAR reduction at the 10−2 complementary cumulative distribution function (CCDF) level can be obtained.
摘要翻译：公开了一种用于降低多载波通信信号的峰值平均功率比（PAR）或峰值因数的约束限幅技术。这是一种发射机侧处理技术，不会在接收机上强加任何修改。约束剪辑实现PAR减少，同时满足大多数现代通信标准规定的频谱掩模和误差向量幅度（EVM）约束。约束剪辑技术包括两个独立的处理单元，一个用于满足带内EVM约束，另一个满足带外频谱约束。可实现的PAR减少结果根据特定标准的要求而变化，但是通过在具有256个子载波的QPSK WiMax信号上使用受限制的限幅，例如，可以获得在10-2互补累积分布函数（CCDF）级别的4.5dB的PAR减小。

8. 发明申请

US20080019453A1 Constrained clipping for peak-to-average power ratio (crest factor) reduction in multicarrier transmission systems 有权
标题翻译：多载波传输系统的峰均功率比（波峰因数）的约束削波
公开(公告)号：US20080019453A1
公开(公告)日：2008-01-24
申请号：US11588009
申请日：2006-12-11
申请人： Chunming Zhao , Robert Baxley , Guotong Zhou
发明人： Chunming Zhao , Robert Baxley , Guotong Zhou
IPC分类号： H04K1/10
CPC分类号： H04L27/2623
摘要： Disclosed is a constrained clipping technique for reducing the peak-to-average power ratio (PAR) or crest factor of a multicarrier communications signal. This is a transmitter-side processing technique that does not impose any modification at the receiver. Constrained clipping achieves PAR reduction while simultaneously satisfying spectral mask and error vector magnitude (EVM) constraints that are specified by most modern communications standards. The constrained clipping technique includes two independent processing units, one to satisfy an in-band EVM constraint and the other to satisfy an out-of-band spectral constraint. Achievable PAR reduction results vary depending on a particular standard's requirements, but by using constrained clipping on a QPSK WiMax signal with 256 subcarriers, for example, a 4.5 dB PAR reduction at the 10−2 complementary cumulative distribution function (CCDF) level can be obtained.
摘要翻译：公开了一种用于降低多载波通信信号的峰值平均功率比（PAR）或峰值因数的约束限幅技术。这是一种发射机侧处理技术，不会在接收机上强加任何修改。约束剪辑实现PAR减少，同时满足大多数现代通信标准规定的频谱掩模和误差向量幅度（EVM）约束。约束剪辑技术包括两个独立的处理单元，一个用于满足带内EVM约束，另一个满足带外频谱约束。可实现的PAR减少结果根据特定标准的要求而变化，但是通过在具有256个子载波的QPSK WiMax信号上使用受限制的限幅，例如在10-2补充累积分布函数上的4.5dB的PAR减小（CCDF）电平。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式