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    • 86. 发明申请
    • METHOD AND APPARATUS FOR ACHIEVING FLEXIBLE BANDWIDTH USING VARIABLE GUARD BANDS
    • 使用可变保护卡实现柔性带宽的方法和装置
    • WO2007050921A2
    • 2007-05-03
    • PCT/US2006/042055
    • 2006-10-27
    • QUALCOMM IncorporatedKHANDEKAR, AamodPALANKI, Ravi
    • KHANDEKAR, AamodPALANKI, Ravi
    • H04L27/26
    • H04L5/0044H04L5/0007H04L5/0048H04L5/0053H04L27/2602H04L27/2613H04L27/2626H04L27/2666
    • Techniques to flexibly support different bandwidths in a wireless communication system are described. The system supports a configurable operating bandwidth using a fixed design bandwidth and variable guard bands. Values for various parameters such as fast Fourier transform (FFT) size, cyclic prefix length, and sample rate may be selected based on the design bandwidth. The design bandwidth may be associated with K total subcarriers. Different operating bandwidths may be supported by selecting different numbers of usable subcarriers. A transmitter and a receiver may perform processing for a transmission using the same FFT size, cyclic prefix length, and sample rate regardless of the selected operating bandwidth. The system may use different operating bandwidths and/or different parameter values (e.g., FFT sizes) for different portions of a transmission, e.g., a preamble and a main body of the transmission.
    • 描述了在无线通信系统中灵活地支持不同带宽的技术。 该系统使用固定设计带宽和可变保护频段来支持可配置的工作带宽。 可以基于设计带宽来选择诸如快速傅立叶变换(FFT)大小,循环前缀长度和采样率等各种参数的值。 设计带宽可以与K个总副载波相关联。 可以通过选择不同数量的可用子载波来支持不同的工作带宽。 发射机和接收机可以使用相同的FFT大小,循环前缀长度和采样率来执行用于传输的处理,而与所选择的操作带宽无关。 系统可以对传输的不同部分(例如,前导码和传输的主体)使用不同的操作带宽和/或不同的参数值(例如,FFT大小)。
    • 90. 发明申请
    • PRUNED BIT-REVERSAL INTERLEAVER
    • 经过翻转的双向交互
    • WO2006069392A1
    • 2006-06-29
    • PCT/US2005/047623
    • 2005-12-22
    • QUALCOMM INCORPORATEDPALANKI, RaviKHANDEKAR, Aamod
    • PALANKI, RaviKHANDEKAR, Aamod
    • H03M13/27
    • H03M13/2789H03M13/2757H03M13/276
    • A pruned bit-reversal interleaver supports different packet sizes and variable code rates and provides good spreading and puncturing properties. To interleave data, a packet of input data of a first size is received. The packet is extended to a second size that is a power of two, e.g., by appending padding or properly generating write addresses. The extended packet is interleaved in accordance with a bit-reversal interleaver of the second size, which reorders the bits in the extended packet based on their indices. A packet of interleaved data is formed by pruning the output of the bit-reversal interleaver, e.g., by removing the padding or properly generating read addresses. The pruned bit-reversal interleaver may be used in combination with various types of FEC codes such as a Turbo code, a convolutional code, or a low density parity check (LDPC) code.
    • 修剪的位反转交错器支持不同的分组大小和可变代码率,并提供良好的扩展和打孔属性。 为了交织数据,接收到第一大小的输入数据的分组。 例如,通过附加填充或适当地生成写入地址,将分组扩展到二次幂的第二大小。 扩展分组根据第二大小的位反转交织器进行交织,根据它们的索引对扩展分组中的比特进行重新排序。 通过例如通过去除填充或适当地生成读取地址来修剪比特反转交织器的输出来形成交织数据的分组。 修剪的位反转交织器可以与诸如Turbo码,卷积码或低密度奇偶校验(LDPC)码的各种类型的FEC码组合使用。