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downlink communication

A communication system, spread spectrum technology, applied in the field of communication, can solve problems such as conflicts

Active Publication Date: 2017-06-09
NDJR网格第二合伙有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If two stations attempt to transmit at the same time, a collision will result, which will be detected by all participating stations

Method used

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Examples

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Embodiment Construction

[0045] Exemplary embodiments are described below with reference to the accompanying drawings. It is to be understood that the following description is intended to describe exemplary embodiments and is not intended to limit the invention as defined in the appended claims.

[0046] figure 1 An uplink transmitter 10 is described, which includes components such as convolutional encoders, interleaving blocks, modulators, pseudo-noise spreaders, filters, a stack of taps, automatic frequency control (AFC) Structures such as spinners and other similar structures. These structures perform the operations described in blocks 12 , 14 , 16 , 18 , 20 and 22 . The transmit path of the uplink transmitter 10 is a coded and spread spectrum waveform. In an exemplary embodiment, the uplink transmitter 10 may be included in a tag that communicates with an access point using a demodulated communication channel with other tags. Additionally, the uplink transmitter 10 may perform fewer or differ...

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Abstract

A method for conserving bandwidth in a communication system includes spreading a frame of data using a first pseudonoise (PN) spreader. The broadcast frame is spread using a second PN spreader. A complex data stream having a first component and a second component is generated. The data frame is assigned to the first component and the broadcast frame is assigned to the second component. The complex data stream is passed to a tag.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Patent Application No. 12 / 408,538, filed March 20, 2009, which issued as U.S. Patent No. 7,639,726 on December 29, 2009, and this application claims No. 12 / 647,756, filed on 11 May 2009, the entire disclosures of both of which are incorporated herein by reference. technical field [0003] Embodiments of the present application relate to the field of communications. More specifically, the exemplary embodiments relate to downlink communications in slot-based communications systems. Background technique [0004] To facilitate communication in multi-user networks, many modulation techniques have been developed. These techniques include Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), and Frequency Division Multiple Access (FDMA). CDMA is a spread spectrum technique that uses a sequence of pseudorandom numbers to modulate incoming data, uses multiple tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/06
CPCH04W28/06H04W72/0466H04J13/0003H04B1/69H04L1/16H04L27/00
Inventor K.C.辛苏安T.J.迈尔斯L.N.科亨M.休斯D.T.维尔纳R.W.贝塞尔P.M.辛格勒
Owner NDJR网格第二合伙有限责任公司