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Wireless communication system configured to communicate using a mixed waveform configuration

A wireless communication system and waveform technology, applied in wireless communication, data exchange through path configuration, multiplexing communication, etc., can solve problems such as timing calibration loss, carrier phase loss, disturbance, etc.

Inactive Publication Date: 2005-02-16
GLOBESPANVIRATA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A receiver may experience AGC disturbances due to power variations, AGC disturbances due to spectrum variations, AGC disturbances due to multipath effects, loss of channel impulse response (CIR) (multipath) estimates, carrier phase loss, loss of carrier frequency, and loss of timing alignment

Method used

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  • Wireless communication system configured to communicate using a mixed waveform configuration
  • Wireless communication system configured to communicate using a mixed waveform configuration
  • Wireless communication system configured to communicate using a mixed waveform configuration

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Experimental program
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Embodiment Construction

[0042] The structure according to the invention reuses the equalizer information obtained during the acquisition of the single carrier portion of the signal. Therefore, although an OFDM preamble is still given for convenience and fine tuning, an OFDM preamble is not necessary. This disclosure describes a technique for providing full continuity between single-carrier and OFDM (multi-carrier) segments. This continuity is provided by fully specifying the transmit waveforms for single carrier and OFDM segments and specifying the transitions. This provides full continuity between the two signal segments, including AGC (power), carrier phase, carrier frequency, timing and spectrum (multipath). In this way, it is not necessary to reacquire the signal with the multipath part of the receiver, since the information formed during the duration of the single carrier part (preamble / header) is valid and used to start acquiring the multicarrier part. Maintaining and accumulating information...

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Abstract

A wireless communication system 103 configured to communicate using a mixed waveform configuration 301. The mixed waveform includes a first portion 2101 modulated according to a single-carrier scheme with a preamble 303 and header 305 and a second portion 2103 modulated according to a multi-carrier scheme. The waveform is specified so that a CIR estimate obtainable from the first portion is reusable for acquisition of the second portion by the receiver. The transmitter 1601 may include first 1605 and second 1603 kernels and a switch 1607, where switch selects the first kernel for the first portion and the second kernel for the second portion to develop a transmit waveform. The receiver 201 may include a single-carrier receiver 207, a multi-carrier receiver 209, and a switch 205 that provides a first portion of a signal being received to the single-carrier receiver and a second portion of the signal being received to the multi-carrier receiver.

Description

technical field [0001] The present invention relates to wireless communication, and more particularly to a wireless communication system configured to communicate using a single-carrier-multi-carrier hybrid waveform structure. Background technique [0002] The Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard is a family of standards for wireless local area networks (WLANs) in the unregistered 2.4 and 5 gigahertz (GHz) frequency bands. The current 802.11b standard defines different data rates in the 2.4 GHz band, including rates of magnitudes 1, 2, 5.5, and 11 megabits per second (Mbps). The 802.11b standard uses Direct Sequence Spread Spectrum (DSSS), a serial modulation technique, with a chip rate of 11 megahertz (MHz). The 802.11a standard defines different and higher data rates of 6, 12, 18, 24, 36 and 54 Mbps in the frequency band of 5 GHz. It should be noted that systems implemented according to the 802.11a and 802.11b standards are not compati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B7/26H04J1/02H04L12/28H04L12/56H04L25/02H04L27/00H04L27/26
CPCH04L27/2613H04W84/00H04L25/0226H04L27/0008
Inventor 马克·A·韦伯斯特迈克尔·J·西奥斯
Owner GLOBESPANVIRATA