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    • 61. 发明授权
    • Systems and methods for communicating spread spectrum signals using variable signal constellations
    • 使用可变信号星座传播扩频信号的系统和方法
    • US06934317B1
    • 2005-08-23
    • US09686304
    • 2000-10-11
    • Paul W. Dent
    • Paul W. Dent
    • H04L1/00H04L27/34H04B1/69
    • H04L1/006H04L1/0003H04L1/0009H04L1/0033H04L1/0066H04L27/3488
    • According to embodiments of the invention, a communications system includes an error correction encoder that error correction encodes a bitstream according to an error correction code. The system also includes a variable symbol generator that generates a symbol according to a selected one of a plurality of selectable signal constellations from a group of bits of the error correction encoded bitstream. The system further includes a spreader that spreads the symbol according to a spreading code, and a transmitter that transmits the spread symbol in a communications medium. Preferably, the plurality of selectable signal constellations includes at least two signal constellations of different order. In other embodiments, the error correction encoder includes a variable error-correction encoder that encodes the bitstream according to a selected error correction code of a plurality of selectable error correction codes. In still other embodiments, the spreader includes a variable spreader that spreads the symbol according to a selected spreading code of a plurality of selectable orthogonal spreading codes including at least two spreading codes of different lengths. A controller may select the error correction code used by the variable error correction encoder, the signal constellation used by the variable symbol generator, and the spreading code used by the variable spreader to provide a desired information transmission rate for the bitstream. Related methods are also described.
    • 根据本发明的实施例,通信系统包括纠错编码器,该纠错编码器根据纠错码对位流进行纠错编码。 该系统还包括可变符号发生器,其根据来自纠错编码比特流的一组比特的多个可选信号星座中选择的一个生成符号。 该系统还包括根据扩展码扩展符号的扩展器和在通信介质中发送扩展符号的发送器。 优选地,多个可选信号星座包括不同顺序的至少两个信号星座。 在其他实施例中,纠错编码器包括可变纠错编码器,其根据多个可选择的纠错码的所选择的纠错码来编码比特流。 在其他实施例中,扩展器包括可变扩展器,其根据包括不同长度的至少两个扩展码的多个可选正交扩展码的所选择的扩展码来扩展符号。 控制器可以选择由可变纠错编码器使用的纠错码,由可变符号发生器使用的信号星座,以及可变扩展器使用的扩展码,以提供比特流的期望的信息传输速率。 还描述了相关方法。
    • 63. 发明授权
    • Methods and apparatus for allocating resources in hybrid TDMA communication systems
    • 用于在混合TDMA通信系统中分配资源的方法和装置
    • US06631124B1
    • 2003-10-07
    • US09432989
    • 1999-11-03
    • Havish KoorapatyYi-Pin Eric WangPaul W. Dent
    • Havish KoorapatyYi-Pin Eric WangPaul W. Dent
    • H04J300
    • H04W72/08H04B7/2618H04W48/06
    • A wireless communications system including at least one base station operative to communicate with terminals on a plurality of carrier frequencies in repetitive time slots defined thereon is operated by assigning an entire time slot or a spreading-code defined subchannel of a time slot to a terminal based on a communications constraint associated with the terminal. The communications constraint may include a performance requirement, such as an information rate or an error rate, and a signal reception condition, such as signal to noise ratio. According to another aspect, a wireless communications system determines a communications constraint associated with a terminal. The system assigns a time slot, a spreading code, a coding rate and a bandwidth to the terminal based on the determined communications constraint. Preferably, the system assigns a time slot, a spreading code, a coding rate and a bandwidth to the terminal such that at least one of an available bandwidth, a number of available time slots, and a number of available spreading codes is optimized. Related apparatus are also described.
    • 一种无线通信系统,包括至少一个基站,可操作以与在其上定义的重复时隙中的多个载波频率上的终端进行通信,通过将时隙的全部时隙或扩展码定义的子信道分配给终端来进行操作 关于与终端相关联的通信约束。 通信约束可以包括诸如信息速率或错误率的性能要求,以及诸如信噪比的信号接收条件。 根据另一方面,无线通信系统确定与终端相关联的通信约束。 系统基于所确定的通信约束向终端分配时隙,扩展码,编码率和带宽。 优选地,系统向终端分配时隙,扩展码,编码率和带宽,使得可用带宽,可用时隙的数量和可用扩展码的数量中的至少一个被优化。 还描述了相关装置。
    • 64. 发明授权
    • Cellular communication device with scanning receiver and continuous mobile communication system employing same
    • 具有扫描接收机的蜂窝通信设备和采用其的连续移动通信系统
    • US06591100B1
    • 2003-07-08
    • US09196005
    • 1998-11-19
    • Paul W. Dent
    • Paul W. Dent
    • H04Q720
    • H04W48/16H04W48/20Y02D70/1222
    • A device and method is provided that transmits a monitor report to the current base station concurrently with the transmission of the informational content carrying signals by embedding the monitor report in the informational content carrying signals. The current base station uses the monitor report to initiate transfer of service for the mobile communication device to the base station with the strongest carrier signal strength by sending appropriate signals to the mobile switching center that in turn signals the base station to take over service for the mobile communication device. A wideband digitizing circuit obtains amplified wideband analog signals from the receiver before channel filtering and demodulation, and converts them to complex digital samples. The digital samples are obtained at a rate greater than the Nyquist rate for the total scanned bandwidth but are only taken during a very short time interval commensurate with the reciprocal of the channel spacing, thereby reducing power consumption to a minimum. The digital samples are then operated on by a microprocessor or signal processor to determine energy in a plurality of channels, preferably using a fast Fourier transform. The analysis results in an indication of the channels containing the strongest signals and this information is provided in the monitor report sent to the current base station.
    • 提供了一种装置和方法,通过将监视报告嵌入到信息内容携带信号中,通过传送信息内容携带信号同时向当前基站发送监视报告。 当前的基站使用监视报告,通过向移动交换中心发送适当的信号,以最强的载波信号强度来启动移动通信设备向基站的业务传输,而移动交换中心又向基站发信号通知接收业务 移动通信设备。 宽带数字化电路在信道滤波和解调之前从接收机获得放大的宽带模拟信号,并将其转换为复数数字样本。 数字样本以大于奈奎斯特速率的速率获得,对于总扫描带宽而言,仅在与信道间隔的倒数相当的非常短的时间间隔内进行,从而将功耗降至最低。 然后,数字样本由微处理器或信号处理器操作以确定多个通道中的能量,优选地使用快速傅里叶变换。 分析结果显示包含最强信号的信道,并且该信息在发送到当前基站的监视报告中提供。
    • 70. 发明授权
    • Partially block-interleaved CDMA coding and decoding
    • 部分块交织的CDMA编码和解码
    • US06359874B1
    • 2002-03-19
    • US09082722
    • 1998-05-21
    • Paul W. Dent
    • Paul W. Dent
    • H04B7216
    • H04L1/08H04J11/005H04J13/0048H04J13/18
    • The present invention discloses a CDMA coding method including the steps of converting the information to be transmitted into digital form, error-correction coding the digital information, and assembling the coded symbols into frames having N symbols. Each coded information symbol within a frame is then repeated a first number of times L1 in succession and the sign of select repeated symbols, determined by a spreading code generator, is changed to produce a symbol block of N×L1 symbols. The symbol block is then repeated a second umber of times L2, where for each block repeat, a block sign change is applied to all symbols of the same block; the sign for each block may also be supplied by the spreading code generator. The resulting L2×N×L1 coded and repeated symbols are then modulated upon a radio frequency carrier and transmitted to a receiver simultaneously with similar symbols intended for other receivers, where different information is transmitted to a plurality of receivers. Signals coded for simultaneous transmission to different receivers may include a greater number of information symbols repeated a reduced number L1 times or a lesser number of information symbols repeated a greater number L1 times, while still maintaining the same number of repeated symbols in a block. By assigning specific block-spreading sequences to groups of signals in various adjacent service areas or according to transmitter-receiver distance, strong signals can be better discriminated from weak signals and inter-cell interference can be reduced.
    • 本发明公开了一种CDMA编码方法,包括以下步骤:将要发送的信息转换为数字形式,对数字信息进行纠错编码,并将编码的符号组合成具有N个符号的帧。 帧内的每个编码信息符号然后连续重复第一次L1,并且由扩展码产生器确定的选择重复符号的符号被改变以产生NxL1个符号的符号块。 然后,符号块重复第二个次数L2,其中对于每个块重复,块符号改变被应用于同一块的所有符号; 每个块的符号也可以由扩展码发生器提供。 所得到的L2xNxL1编码和重复符号然后在无线电频率载波上进行调制,并与用于其他接收机的类似符号同时发送到接收机,其中不同的信息被发送到多个接收机。 编码用于同时发送到不同接收机的信号可以包括更多数量的重复减少数量L1的信息符号或更少数量的重复更多数量L1的信息符号,同时仍然在块中保持相同数量的重复符号。 通过将特定的块扩展序列分配给各个相邻服务区域中的信号组,或者根据发射机 - 接收机距离,可以更好地识别弱信号,从而可以减小小区间干扰。