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1. 发明申请

WO2011002935A2 TIME TRACKING LOOPS FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX 审中-公开
标题翻译：用于使用循环前缀的通信系统的时间跟踪功能
公开(公告)号：WO2011002935A2
公开(公告)日：2011-01-06
申请号：PCT/US2010/040675
申请日：2010-06-30
申请人： QUALCOMM INCORPORATED , SRINIVASAN, Shivratna G. , MCCLOUD, Michael, L. , GURSKI, Remi, J. , KANDUKURI NARAYANA, Sunil Kumar
发明人： SRINIVASAN, Shivratna G. , MCCLOUD, Michael, L. , GURSKI, Remi, J. , KANDUKURI NARAYANA, Sunil Kumar
IPC分类号： H04L27/26 , H04L25/02
CPC分类号： H04L27/2662 , H04L25/0212 , H04L27/2665
摘要： Techniques for performing time tracking in a communication system utilizing a cyclic prefix are described. In an aspect, a receiver may detect for large timing errors based on early and late received samples obtained with early and late FFT windows, respectively. The receiver may derive first and second channel impulse response (CIR) estimates based on the early and late received samples, respectively, determine an early channel energy based on the first CIR estimate, determine a late channel energy based on the second CIR estimate, compute an update amount based on the early and late channel energies, and update the FFT window position based on the update amount. In another aspect, the receiver may perform time tracking with an inner time tracking loop (TTL) and an outer TTL. The receiver may update the FFT window position in coarse steps with the outer TTL and in fine steps with the inner TTL.
摘要翻译：描述了在利用循环前缀的通信系统中执行时间跟踪的技术。在一方面，接收机可以分别基于早期和晚期FFT窗口获得的早期和晚期接收样本来检测大的定时误差。接收机可以基于早期和晚期接收的采样分别得出第一和第二信道脉冲响应（CIR）估计，基于第一CIR估计确定早期信道能量，基于第二CIR估计确定后期信道能量，计算基于早期和晚期信道能量的更新量，并且基于更新量来更新FFT窗口位置。在另一方面，接收机可以利用内部时间跟踪环（TTL）和外部TTL执行时间跟踪。接收机可以使用外部TTL以内部TTL的精细步骤更新FFT窗口位置。

2. 发明申请

WO2011002790A1 DUAL FREQUENCY TRACKING LOOP FOR OFDMA SYSTEMS 审中-公开
标题翻译：用于OFDMA系统的双频跟踪环路
公开(公告)号：WO2011002790A1
公开(公告)日：2011-01-06
申请号：PCT/US2010/040437
申请日：2010-06-29
申请人： QUALCOMM Incorporated , BANISTER, Brian C. , SRINIVASAN, Shivratna G. , BREHLER, Matthias , KANDUKURI NARAYANA, Sunil Kumar , CHALLA, Raghu, N.
发明人： BANISTER, Brian C. , SRINIVASAN, Shivratna G. , BREHLER, Matthias , KANDUKURI NARAYANA, Sunil Kumar , CHALLA, Raghu, N.
IPC分类号： H04B1/38 , H04L27/26
CPC分类号： H04L27/2657 , H03J1/005 , H04L2027/0055 , H04L2027/0065 , H04L2027/0067
摘要： Methods and apparatus for correcting frequency errors between a carrier frequency of a signal received by a wireless device and a reference frequency local to the device. For certain aspects, such a method generally includes receiving a signal in a receiver having an LO producing a reference frequency, a radio frequency (RF) phase-locked loop (PLL), and a digital rotator, estimating a frequency difference between a carrier frequency of the received signal and the LO reference frequency, and applying the estimated frequency difference to the RF PLL and the digital rotator.
摘要翻译：用于校正由无线设备接收的信号的载波频率与设备本地的参考频率之间的频率误差的方法和装置。对于某些方面，这种方法通常包括在具有产生参考频率的LO的接收机中接收信号，射频（RF）锁相环（PLL）和数字旋转器，估计载波频率的接收信号和LO参考频率，并将估计的频差应用于RF PLL和数字旋转器。

3. 发明申请

WO2009120912A1 APPARATUS AND METHOD FOR ADAPTIVE POWER CONTROL 审中-公开
标题翻译：用于自适应功率控制的装置和方法
公开(公告)号：WO2009120912A1
公开(公告)日：2009-10-01
申请号：PCT/US2009/038471
申请日：2009-03-26
申请人： QUALCOMM INCORPORATED , KANDUKURI NARAYANA, Sunil Kumar , SAMPATH, Hemanth
发明人： KANDUKURI NARAYANA, Sunil Kumar , SAMPATH, Hemanth
IPC分类号： H04W52/36
CPC分类号： H04W52/362
摘要： In embodiments, a first wireless device generates symbols for transmission to another wireless device. Adaptive power control is applied to the transmissions, for example, at symbol or frame boundaries. When a transmit power gain adjustment exceeds a threshold, all or part of the gain adjustment may be performed on the generated symbols before the symbols are combined in an overlap-and-add process. Part of the gain adjustment may also be performed through adjustment of the power amplifier. When the gain adjustment does not exceed the threshold, all of the gain adjustment may be performed through adjustment of the power amplifier. Performing gain adjustment before the overlap-and-add process results in a lower spectral spread of the transmitted waveform and improved bandwidth utilization efficiency. In embodiments, the power adjustment techniques are used in FDD/OFDM systems or other systems where a plurality of symbols or frames is transmitted substantially continuously.
摘要翻译：在实施例中，第一无线设备生成用于传输到另一无线设备的符号。自适应功率控制被应用于传输，例如在符号或帧边界。当发射功率增益调整超过阈值时，可以在符号在重叠和相加处理中组合之前对生成的符号执行全部或部分增益调整。增益调整的一部分也可以通过功率放大器的调节来执行。当增益调整不超过阈值时，可以通过功率放大器的调节来执行所有增益调整。在重叠和添加过程之前执行增益调整会导致传输波形的较低频谱扩展，并提高带宽利用率。在实施例中，功率调整技术用于FDD / OFDM系统或其中基本连续地发送多个符号或帧的其他系统。

4. 发明申请

WO2009123878A1 RETURN LINK TIME ADJUSTMENTS IN FDD OFDMA OR SC-FDM SYSTEMS 审中-公开
标题翻译：在FDD OFDMA或SC-FDM系统中返回链路时间调整
公开(公告)号：WO2009123878A1
公开(公告)日：2009-10-08
申请号：PCT/US2009/037994
申请日：2009-03-23
申请人： QUALCOMM INCORPORATED , SAMPATH, Hemanth , LIN, Jeremy, H. , KANDUKURI NARAYANA, Sunil Kumar , VERMANI, Sameer
发明人： SAMPATH, Hemanth , LIN, Jeremy, H. , KANDUKURI NARAYANA, Sunil Kumar , VERMANI, Sameer
IPC分类号： H04L27/26 , H04J3/06
CPC分类号： H04L27/2607 , H04L27/2655
摘要： A method for adjusting timing in a Frequency Division Multiplexing (FDM) system, including receiving a request to perform a timing correction, generating a time domain FDM symbol, and controlling the timing correction in the time domain FDM symbol by at least one of adjusting a length of a cyclic prefix, overlapping a portion of adjacent FDM symbols, adjusting a symbol windowing length, or utilizing a return link (RL) silence interval.
摘要翻译：一种用于在频分复用（FDM）系统中调整定时的方法，包括接收执行定时校正的请求，产生时域FDM符号，以及通过以下步骤中的至少一个来控制时域FDM符号中的定时校正：循环前缀的长度，与相邻FDM符号的一部分重叠，调整符号加窗长度，或利用返回链路（RL）静默间隔。

5. 发明申请

WO2009120640A2 APPARATUS, PROCESSES, AND ARTICLES OF MANUFACTURE FOR FAST FOURIER TRANSFORMATION AND BEACON SEARCHING 审中-公开
标题翻译：装置，工艺和制造快速FOURIER变换和BEACON搜索的文章
公开(公告)号：WO2009120640A2
公开(公告)日：2009-10-01
申请号：PCT/US2009/037989
申请日：2009-03-23
申请人： QUALCOMM INCORPORATED , SAMPATH, Hemanth , ZHANG, Xin , LIN, Jeremy, H. , SHARMA, Nistha , PALANKI, Ravi , KANDUKURI NARAYANA, Sunil Kumar
发明人： SAMPATH, Hemanth , ZHANG, Xin , LIN, Jeremy, H. , SHARMA, Nistha , PALANKI, Ravi , KANDUKURI NARAYANA, Sunil Kumar
IPC分类号： G06F17/14
CPC分类号： G06F17/142 , H04L5/0007 , H04L5/0023 , H04L5/0053 , H04L27/265
摘要： In embodiments, a wireless receiver employs a hardware-based Fast Fourier Transform (FFT) engine controlled by firmware. The FFT engine executes tasks stored in a task list. Each task is associated with a different portion of a signal, for example, one or more Orthogonal Frequency Division Modulated (OFDM) symbols. Each task may include configuration information for the FFT engine for configuring the engine to process the associated portion of the signal, a pointer to the portion to be processed, and another pointer to the memory for storing the output. The task list may be firmware controlled. Division of the FFT into a configurable hardware part driven by firmware to read and execute the tasks in the task list may speed up the FFT process and make it more flexible. A hardware beacon sorter may be coupled to the FFT engine to sort the sub-carriers according to their energies.
摘要翻译：在实施例中，无线接收机采用由固件控制的基于硬件的快速傅立叶变换（FFT）引擎。 FFT引擎执行任务列表中存储的任务。每个任务与信号的不同部分相关联，例如一个或多个正交频分调制（OFDM）符号。每个任务可以包括用于配置引擎以处理信号的相关部分的引擎的FFT引擎的配置信息，到要处理的部分的指针，以及用于存储输出的另一个指向存储器的指针。任务列表可以是固件控制的。将FFT分解为由固件驱动的可配置硬件部分，以读取和执行任务列表中的任务，可加速FFT过程并使其更加灵活。硬件信标分类器可以耦合到FFT引擎，以根据它们的能量对子载波进行分类。

6. 发明申请

WO2009120456A3 BIT-WIDTH MINIMIZATION SCHEME FOR WIRELESS COMMUNICATION 审中-公开
公开(公告)号：WO2009120456A3
公开(公告)日：2009-10-01
申请号：PCT/US2009/035768
申请日：2009-03-02
申请人： QUALCOMM Incorporated , KANDUKURI NARAYANA, Sunil Kumar , SAMPATH, Hemanth , VERMANI, Sameer
发明人： KANDUKURI NARAYANA, Sunil Kumar , SAMPATH, Hemanth , VERMANI, Sameer
IPC分类号： H04L1/06 , H04L5/02 , H04L27/26 , H04J13/00
摘要： A technique for generating a reduced bit-width in a signal generated by a first-type modulator in a communication apparatus that includes two distinct modulators. In particular, the communication apparatus includes a first modulator adapted to generate a first modulated signal quantified to a first bit-width, a second modulator adapted to generate a second modulated signal quantified to a second bit-width that is less than the first bit-width, and a device to generate a third modulated signal comprising a combination of the first and second modulated signals. In an exemplary implementation, the first modulator includes an OFDMA modulator, the second modulator includes a CDMA, and the combining device includes an IFFT. Additionally, an apparatus for processing a communication signal includes a tasklist cache memory having a tasklist, a processor adapted to provide a task to the tasklist, and a communication module adapted to fetch the task from the tasklist, and process the communication signal based on the retrieved task.

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