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Base station midamble selection

a technology of base station and mid-amble, which is applied in the field of wireless time division duplex, can solve the problems of poor performance of approach and high complexity of approach

Inactive Publication Date: 2005-08-04
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the number of required matched filters, this approach has a high complexity.
Additionally, if there is a high correlation between channelization codes, this approach may have poor performance.

Method used

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  • Base station midamble selection
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Examples

Experimental program
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Embodiment Construction

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[0015]FIG. 3 illustrates a simplified base station transmitter 26 and a UE receiver 28 using multiuser detection (MUD). Data to be communicated to the active UEs 141 to 143 is produced by data generators 321 to 32K. Each generator 321 to 32K produces data to be sent in a particular communication burst. Each communication burst's generated data is subsequently formatted into a communication burst by a spreading and modulation device 341 to 34K. The spreading and modulation device 341 to 34K adds the midamble and spreads the generated data with a channelization code associated with that communication burst. Additionally, the spread data is time multiplexed into the appropriate time slot. All of the communication bursts are combined by a combiner 52. The combined communication bursts are modulated up to radio frequency, such as by a mixer 36, and the radio frequency signal is radiated by an antenna 38 through a wireless radio channel 30. If transmit diversity is utilized by the base s...

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PUM

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Abstract

Midamble codes are selected in a wireless time division duplex communication system. At least one channelization code is assigned to a user equipment. A mapping is provided between midamble codes and channelization codes. At least one midamble code is mapped to a plurality of channelization codes having a same spreading factor. The midamble code mapped to the at least one channelization code to the user equipment is selected. A communication burst is formed with the assigned at least one channelization code and the selected midamble code.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 090,498, filed Mar. 4, 2002 which is a continuation of U.S. patent application Ser. No. 09 / 775,969, filed Feb. 2, 2001, which claims priority from U.S. Provisional Patent Application No. 60 / 180,402, filed Feb. 4, 2000, all of which are incorporated by reference as if fully set forth.BACKGROUND OF THE INVENTION [0002] The present invention relates generally to wireless time division duplex using code division multiple access (TDD / CDMA) communication systems. In particular, the invention relates to determining channelization codes for use in multiuser detection in the downlink for TDD / CDMA systems. [0003] A TDD / CDMA communication system is illustrated in FIG. 1. The system 10 has multiple base stations 121 to 125. Each base station 121 has an associated operating area. User equipments (UEs) 141 to 143 in a base station's operating area communicate with that base sta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/707H04B1/7073H04B1/7093H04B1/7103H04B1/7105H04B7/00H04J3/00H04J11/00H04J13/00H04J13/16H04W72/04
CPCH04B1/70735H04B1/7103H04B1/7105H04B2001/70935H04J13/16H04J13/00H04B1/707H04B2201/70709H04B2201/70701
Inventor ZEIRA, ARIELAZEIRA, ELDADREZNIK, ALEXANDERTERRY, STEPHEN E.
Owner INTERDIGITAL TECH CORP