公开(公告)号：US5638371A

公开(公告)日：1997-06-10

申请号：US495164

申请日：1995-06-27

Applicant: Dipankar Raychaudhuri ,  Hai Xie ,  Ruixi Yuan

Inventor： Dipankar Raychaudhuri ,  Hai Xie ,  Ruixi Yuan

IPC: H04J3/00 ,  H04L1/16 ,  H04L1/18 ,  H04L12/28 ,  H04L12/56 ,  H04Q11/04 ,  H04W12/10 ,  H04W72/12 ,  H04J3/16

CPC classification number: H04W72/1252 ,  H04L1/1854 ,  H04Q11/0478 ,  H04L1/16 ,  H04L2012/5607 ,  H04L2012/5616 ,  H04L2012/563 ,  H04L2012/5632 ,  H04L2012/564 ,  H04L2012/5645 ,  H04L2012/5652 ,  H04W12/10

Abstract: A medium access control (MAC) layer protocol is used in a wireless ATM system for integrated support of ATM services, including constant bit-rate (CBR), variable bit-rate (VBR) and available bit-rate (ABR) services. The MAC protocol supports both connectionless packet and connection-oriented virtual circuit modes, with appropriate service parameter and quality-of-services selection. A dynamic time division, multiple access/time division multiplex (TDMA/TDM) approach accommodates the service classes in an integrated manner. A supervisory MAC procedure integrates ATM ABR/VBR/CBR virtual circuits, providing burst-by-burst allocation of ABR cells and call-by-call allocation of VBR and CBR bandwidth parameters. A mechanism is provided for the dynamic allocation of subframe capacities, assignment of ABR slots based on desired queueing rules, assignment of VBR slots based on ATM traffic shaper parameters and assignment of CBR slots based on bandwidth requirements.

Abstract translation: 在无线ATM系统中使用媒体接入控制（MAC）层协议来综合支持ATM业务，包括恒定比特率（CBR），可变比特率（VBR）和可用比特率（ABR）业务。 MAC协议支持无连接分组和面向连接的虚拟电路模式，具有适当的服务参数和服务质量选择。 动态时分，多址/时分复用（TDMA / TDM）方式以集成方式适应服务类。 监控MAC过程集成ATM ABR / VBR / CBR虚拟电路，提供ABR单元的突发分配和VBR和CBR带宽参数的逐个呼叫分配。 提供了用于子帧容量的动态分配的机制，基于期望的排队规则分配ABR时隙，基于ATM流量整形器参数分配VBR时隙，并且基于带宽需求分配CBR时隙。

公开(公告)号：US4641304A

公开(公告)日：1987-02-03

申请号：US873446

申请日：1986-06-06

Applicant: Dipankar Raychaudhuri

Inventor： Dipankar Raychaudhuri

IPC: H04B7/185 ,  H04L12/56 ,  H04J3/02 ,  H04J3/16 ,  H04J3/24

CPC classification number: H04B7/18528 ,  H04W74/08 ,  H04W84/06

Abstract: A transmission system employing a satellite and a plurality of ground stations each capable of transmitting and receiving data packets to and from each other via the satellite. The satellite station comprises first logic for dividing absolute time into time frames and time frames into message (time) slots with each message slot having a small percentage thereof divided into mini-slots and with each mini-slot in each message slot corresponding to a particular message slot in a future time frame, and second logic including a random number selector responsive to the selection of message slots in the same current time frame by two or more data packets, and third logic for randomly selecting mini-slot for each message slot in which a data packet is to be transmitted in the current time frame with the selected mini-slot for each message slot in the current time frame defining the particular message slot in the future time frame in which the data packet is to be transmitted in case two stations select the same message slot in the current time frame to cause a conflict. A future frame is a time frame which occurs after the data packet in the current time frame has propagated from its originating ground station to the satellite and then back to the originating ground station.

Abstract translation: 一种使用卫星和多个地面站的传输系统，每个地面站能够经由卫星彼此发送和接收数据分组。 卫星站包括用于将绝对时间划分为时间帧和时间帧到消息（时间）时隙的第一逻辑，其中每个消息时隙具有被分成小时隙的小百分比，并且每个消息时隙中的每个小时隙对应于特定的时隙 消息时隙，第二逻辑包括响应于通过两个或多个数据分组在相同当前时间帧中选择消息时隙的随机数选择器，以及用于随机选择每个消息时隙的小时隙的第三逻辑， 在当前时间帧中将在当前时间帧中针对每个消息时隙的所选择的小时隙发送数据分组，该当前时间帧中的定义特定消息时隙的数据分组将在其中在第二情况下传送数据分组的将来时间帧 站点在当前时间范围内选择相同的消息时隙引起冲突。 未来的帧是在当前时间帧中的数据分组从其起始地面站传播到卫星，然后返回到起始地面站之后发生的时间帧。

公开(公告)号：US20050265436A1

公开(公告)日：2005-12-01

申请号：US11140878

申请日：2005-05-31

Applicant: Chang-Ho Suh ,  Seok-Hyun Yoon ,  Dong-Seek Park ,  Young-Kwon Cho ,  Dipankar Raychaudhuri ,  Leonid Razoumov

Inventor： Chang-Ho Suh ,  Seok-Hyun Yoon ,  Dong-Seek Park ,  Young-Kwon Cho ,  Dipankar Raychaudhuri ,  Leonid Razoumov

IPC: H04W28/06 ,  H04B1/38 ,  H04L1/00 ,  H04L25/02

CPC classification number: H04L1/0026 ,  H04L1/0045 ,  H04L1/0073 ,  H04L25/0224 ,  H04L27/2601

Abstract: Disclosed are the design and implementation of a CSI feedback channel in a multi-carrier wireless communication system. An apparatus and a method for channel state feedback using arithmetic coding are provided to ensure efficiency and reliability of a system by transmitting the CSI while compressing the CSI with a predetermined compression rate selected depending on a channel state. The apparatus for CSI feedback in a wireless communication system performing channel estimation at a transmitter or a receiver by using a communication channel includes a transmitter terminal transmitting a signal for CSI measurement by using the communication channel, and a receiver terminal receiving the signal from the transmitter terminal, checking a channel state based on the received signal, and transmitting the signal to the transmitter terminal after compressing the signal according to the channel state.

Abstract translation: 公开了多载波无线通信系统中CSI反馈信道的设计和实现。 提供了使用算术编码的信道状态反馈的装置和方法，以通过在按照信道状态选择的预定压缩率压缩CSI的同时发送CSI来确保系统的效率和可靠性。 在通过使用通信信道在发射机或接收机处执行信道估计的无线通信系统中的CSI反馈装置包括通过使用通信信道发送用于CSI测量的信号的发射机终端，以及从发射机接收信号的接收机终端 终端，根据接收到的信号检查信道状态，并根据信道状态对信号进行压缩后将信号发送到发送终端。

公开(公告)号：US5530695A

公开(公告)日：1996-06-25

申请号：US167337

申请日：1993-12-15

Applicant: Rajiv Dighe ,  Gopalakrishnan Ramamurthy ,  Dipankar Raychaudhuri

Inventor： Rajiv Dighe ,  Gopalakrishnan Ramamurthy ,  Dipankar Raychaudhuri

IPC: H04Q3/00 ,  H04L12/56 ,  H04Q11/04 ,  H04L12/26

CPC classification number: H04L12/5602 ,  H04L49/255 ,  H04Q11/0478 ,  H04L2012/5614 ,  H04L2012/5629 ,  H04L2012/5632 ,  H04L2012/5635 ,  H04L2012/5637 ,  H04L2012/564 ,  H04L2012/5645 ,  H04L2012/5651 ,  H04L2012/568

Abstract: An asynchronous transfer mode (ATM) traffic control framework is based on an integrated usage parameter control (UPC) approach, which approach provides a unified and scalable solution to the issue of quality-of-services (QOS) levels over a range of anticipated services in ATM based networks. The approach is consistent with emerging ATM Forum and CCITT standards. Additionally, a UPC-based call and burst admission control providing the desired QOS over periods of network overload by call/burst admission control and traffic shaping of source stream preferably uses a dual leaky bucket.

Abstract translation: 异步传输模式（ATM）流量控制框架基于集成使用参数控制（UPC）方法，该方法为一系列预期服务提供统一和可扩展的解决方案以解决服务质量（QOS）问题 在基于ATM的网络中。 该方法与新兴的ATM论坛和CCITT标准相一致。 此外，通过呼叫/突发准入控制和源流的流量整形，通过网络过载周期提供期望的QOS的基于UPC的呼叫和突发准入控制优选地使用双漏斗。

公开(公告)号：US5122875A

公开(公告)日：1992-06-16

申请号：US661993

申请日：1991-02-27

Applicant: Dipankar Raychaudhuri ,  Joel W. Zdepski ,  Glenn A. Reitmeier ,  Charles M. Wine

Inventor： Dipankar Raychaudhuri ,  Joel W. Zdepski ,  Glenn A. Reitmeier ,  Charles M. Wine

IPC: H04N11/06 ,  H04N5/44 ,  H04N7/015 ,  H04N7/04 ,  H04N7/12 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/50 ,  H04N21/234 ,  H04N21/2343 ,  H04N21/2383 ,  H04N21/438 ,  H04N21/44 ,  H04N21/63 ,  H04N7/00

CPC classification number: H04N7/015 ,  H04N19/00 ,  H04N19/124 ,  H04N19/159 ,  H04N19/174 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/192 ,  H04N19/37 ,  H04N19/423 ,  H04N19/46 ,  H04N19/52 ,  H04N19/60 ,  H04N19/61 ,  H04N21/23406 ,  H04N21/234327 ,  H04N21/2383 ,  H04N21/4382 ,  H04N21/44004 ,  H04N21/631 ,  H04N5/4401 ,  H04N19/13 ,  H04N19/146 ,  H04N19/152 ,  H04N19/30 ,  H04N19/50 ,  H04N19/70 ,  H04N19/91

Abstract: Apparatus for encoding/decoding a HDTV signal for e.g., terrestrial transmission includes a compression circuit responsive to high definition video source signals for providing ierarchically layered codewords CW representing compressed video data and associated codewords T, defining the types of data represented by the codewords CW. A priority selection circuit, responsive to the codewords CW and T, parses the codewords CW into high and low priority codeword sequences wherein the high and low priority codeword sequences correspond to compressed video data of relatively greater and lesser importance to image reproduction respectively. A transport processor, responsive to the high and low priority codeword sequences, forms high and low priority transport blocks of high and low priority codewords respectively. Each transport block includes a header, codewords CW and error detection check bits. The respective transport blocks are applied to an forward error check circuit for applying additional error check data. Thereafter the high and low priority data are applied to a modem wherein they quadrature amplitude modulate respective carriers for transmission.

Abstract translation: 用于对例如地面传输的HDTV信号进行编码/解码的设备包括响应于高分辨率视频源信号的压缩电路，用于提供表示压缩视频数据和相关码字T的复杂分层码字CW，定义由码字CW表示的数据类型。 优选选择电路响应于码字CW和T，将码字CW解析成高优先权码字序列和低优先级码字序列，其中高优先权码字序列和低优先级码字序列分别对应于对图像再现具有相对较大和较小重要性的压缩视频数据。 响应于高优先级和低优先级码字序列的传输处理器分别形成高优先级和低优先级码字的高优先级和低优先级传输块。 每个传输块包括报头，码字CW和错误检测校验位。 相应的传输块被应用于前向错误检查电路以应用附加的错误检查数据。 此后，高优先级数据和低优先级数据被应用于调制解调器，其中正交幅度调制相应的载波进行传输。

公开(公告)号：US4841527A

公开(公告)日：1989-06-20

申请号：US121423

申请日：1987-11-16

Applicant: Dipankar Raychaudhuri ,  Kuriacose Joseph

Inventor： Dipankar Raychaudhuri ,  Kuriacose Joseph

IPC: H04L12/413

CPC classification number: H04L12/413

Abstract: A CDMA network includes a retransmission scheduler which selectively delays the retransmission of an initially erroneously sent signal. The selected delays have an average value in a range of values which results in a single equilibrium point between input messages and output messages to avoid a bistable condition that can lower overall system throughput.

Abstract translation: CDMA网络包括重选调度器，其选择性地延迟最初错误发送的信号的重传。 所选择的延迟在值范围内具有平均值，其导致输入消息和输出消息之间的单个平衡点，以避免可以降低整体系统吞吐量的双稳态。

公开(公告)号：US4745599A

公开(公告)日：1988-05-17

申请号：US424

申请日：1987-01-05

Applicant: Dipankar Raychaudhuri

Inventor： Dipankar Raychaudhuri

IPC: H04B7/185 ,  H04L12/56 ,  H04J3/24

CPC classification number: H04L1/0083 ,  H04B7/18528 ,  H04L1/188 ,  H04L1/1887 ,  H04W74/02 ,  Y10S370/913

Abstract: A random access communication system forms messages to be transmitted into subpackets of fixed duration. A message packet includes two or more subpackets. Each subpacket includes information relating to the source transmitter-receiver and the number of subpackets in the message. The subpackets of the message packet are transmitted contiguously over the transmission path in a contention mode. Some subpackets are successfully received and some are lost due to collisions. After a period of asynchronous contention operation, a predetermined number of subpackets are successfully received, and the system switches to a short-term synchronous, scheduled operating mode. In the scheduled operating mode, those transmitter-receivers which were the sources of message packets including some successful and some unsuccessful subpackets retransmit the data from the unsuccessful subpackets, ordering themselves in accordance with the order of receipt of successful subpackets. The system capacity is high, average delay is short and continuous global synchronization is not required.

Abstract translation: 随机接入通信系统形成要发送到固定持续时间的子分组的消息。 消息包包括两个或更多个子数据包。 每个子分组包括与源发射机 - 接收机有关的信息和消息中的子分组数量。 消息分组的子分组在竞争模式下通过传输路径连续发送。 一些子分组被成功接收，一些子分组由于冲突而丢失。 在异步竞争操作一段时间之后，成功地接收到预定数量的子分组，并且系统切换到短期同步的调度操作模式。 在调度操作模式下，作为包含一些成功和一些不成功的子分组的消息分组的源的那些发送器 - 接收器从不成功的子分组重传数据，根据接收到成功的子分组的顺序进行排序。 系统容量高，平均延时短，不需要全局同步连续。

公开(公告)号：US4536846A

公开(公告)日：1985-08-20

申请号：US420506

申请日：1982-09-20

Applicant: Dipankar Raychaudhuri ,  Leonard N. Schiff

Inventor： Dipankar Raychaudhuri ,  Leonard N. Schiff

IPC: H04B1/64

CPC classification number: H04B1/64

Abstract: An improved companded transmission system uses a transmitter having a first compressor for compressing a signal m(t) of bandwidth B.sub.1 to form a signal C[m(t)]. The transmission system has a bandwidth B.sub.2 where B.sub.1 .ltoreq.B.sub.2. A receiver having an expander to expand the received signal r(t) is provided to produce a signal m.sub.E (t). The improvement consists of a circuit for recovering the frequency components f.sub.L lost during transmission of C[m(t)] and includes a second compressor for compressing m.sub.E (t) in the same manner as m(t) was compressed to produce a signal C[m.sub.E (t)] which contains frequency components f.sub.c lying above B.sub.2. A filter which is responsive to C[m.sub.E (t)] generates (C[m.sub.E (t)]-f.sub.c), and, a subtractor subtracts (C[m.sub.E (t)]-f.sub.c) from C[m.sub.E (t)]. An adder adds f.sub.c to r(t), and, an expander expands the summed signal f.sub.c +r(t) to produce a signal m.sub.1 (t) which is a first order corrected approximation of m(t). Similar structure can iteratively process m.sub.1 (t) to further refine or correct the received signal.

Abstract translation: 改进的压缩传输系统使用具有第一压缩器的发射机来压缩带宽B1的信号m（t）以形成信号C [m（t）]。 传输系统具有B2，B2 = B2。 提供具有扩展器以扩展接收信号r（t）的接收机以产生信号mE（t）。 该改进包括用于恢复在C [m（t）]的传输期间丢失的频率分量fL的电路，并且包括用于以与m（t）相同的方式压缩mE（t）的第二压缩器，以产生信号C [mE（t）]，其包含位于B2上方的频率分量fc。 响应于C [mE（t）]的滤波器产生（C [mE（t）] -fc），并且减法器从C [mE（t）]减去（C [mE（t）] -fc） 。 加法器将fc加到r（t）中，并且扩展器扩展求和信号fc + r（t）以产生作为m（t）的一阶校正近似的信号m1（t）。 类似的结构可以迭代地处理m1（t）以进一步细化或校正接收到的信号。