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Channel estimation for time division duplex communication systems

A technology for wireless channels and user equipment, applied in channel estimation, time division multiplexing systems, multiplexing communications, etc., and can solve problems of high complexity

Inactive Publication Date: 2006-03-01
INTERDIGITAL TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such an approach has a high complexity

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  • Channel estimation for time division duplex communication systems
  • Channel estimation for time division duplex communication systems
  • Channel estimation for time division duplex communication systems

Examples

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Embodiment Construction

[0016] Figure 3 shows a simplified multi-coded transmitter 26 and receiver 28 in a TDD / CDMA communication system. In a preferred application, such as a 2Mbps downlink service, the receiver 28 is in a user equipment 14 and the transmitter 26 is in a base station 12 1 , but the receiver 28 and transmitter 26 could be used in other applications as well.

[0017] The transmitter 26 transmits data over a radio frequency channel 30 . Data is sent in K communication bursts. Data generator 32 in transmitter 26 1 to 32 K Data to be communicated with receiver 28 is generated. Modulation / spreading and training sequence insertion equipment 34 1 to 34 K The data is spread and the spread reference data and the mid-message training sequence are properly assigned time slots and used for coded time-division multiplex transmission of the spread data, thereby generating K communication bursts. For a base station 12 transmitting a downlink burst 1 , the usual K value is from 1 to 16. The...

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Abstract

A single transmitter transmits K communication bursts in a shared spectrum in a time slot of a time division duplex communication system. The system associated with N midamble sequences. Each burst has an associated midamble sequence. A receiver receives a vector corresponding to the transmitted midamble sequences of the K communication bursts. A matrix having N identical right circulant matrix blocks is constructed based in part on the known N midamble sequences. The wireless channel between the transmitter and receiver is estimated based on in part one of the N blocks and the received vector.

Description

[0001] This application is a divisional application with application number 01803476.4 and titled "Channel Estimation for Time Division Duplex Communication System". This application claims priority to US Provisional Patent Application 60 / 175,167, filed January 7,2000. Background technique [0002] The present invention relates to wireless communication systems. In particular, the present invention relates to channel estimation in wireless communication systems. [0003] figure 1 is a schematic diagram of the wireless communication system 10 . The communication system 10 includes communication with user equipment (UE) 14 1 to 14 3 base station 12 for communication 1 to 12 5 . 12 per base station 1 have an associated operating area within which the base station and user equipment 14 1 to 14 3 to communicate. [0004] In some communication systems, such as Code Division Multiple Access (CDMA) systems and Time Division Duplex systems using CDMA (TDD / CDMA), multiple com...

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Application Information

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IPC IPC(8): H04L25/02H04B1/7103H04B1/7105H04B7/005H04J3/00H04W72/04
CPCH04L25/0212H04L25/0246H04L25/0226H04B2201/70701H04B1/71052H04L25/0206H04L25/0242H04B1/7105H04L25/0228H04L25/025H04L25/03331H04L25/0204H04B1/7103
Inventor 阿里埃拉·蔡拉
Owner INTERDIGITAL TECH CORP
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