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Efficient multiple-use code matching wave filter for wide-band CDMA

A matched filter and complex sequence technology, which is applied in multiplex communication, code division multiplex system, diversity/multi-antenna system, etc., can solve the problem that there is no requirement for the receiver to process space diversity transmission, and achieve reduction Wake-up time, the effect of reducing signal peaks

Inactive Publication Date: 2006-01-11
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the Technical Specification describes the use of space-diverse antennas to transmit predefined symbol sequences for the CPICH channel, it does not specify how the receiver handles space-diverse transmissions

Method used

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  • Efficient multiple-use code matching wave filter for wide-band CDMA
  • Efficient multiple-use code matching wave filter for wide-band CDMA
  • Efficient multiple-use code matching wave filter for wide-band CDMA

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Embodiment Construction

[0025] figure 2 A system 10 is illustrated comprising a wireless data network 12 which may, but is not limited to, be in accordance with the Technical Specifications, and a mobile device 14 in accordance with the present invention. The wireless data network 12 has a plurality of base stations 16 of conventional design, wherein each base station includes at least two space diversity antennas 18 to transmit first and second complex sequences, for example according to figure 1 The sequence of the prior art is but not limited thereto. The wireless data network 12 operates in a conventional manner to control the handover. A signal strength estimate obtained from a transmission 20 from one or more base stations 16 to the one or more other base stations 16 is sent from the mobile device 14 . The antenna 22 of the mobile device 14 transmits an uplink transmission of the detected power level of the transmission 20 received by the antenna 22, providing signal strength information to ...

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Abstract

The present invention is a system, mobile device and process. In a system, including a plurality of transmitters which transmit from at least one of the transmitters first and second complex sequences respectively from two spatially diverse antennas of the at least one transmitter to a mobile device, a method at the mobile device in accordance with the invention includes demodulating the first and second complex sequences to produce demodulated complex first and second sequences; detecting the demodulated first and second complex sequences to produce detected complex first and second sequences by multiplying respectively the demodulated first and second complex sequences with complex conjugates thereof; averaging a function of the complex detected first and second sequences to produce an averaged function; and processing the averaged function to detect a time, relative to a system time reference, of at least one peak therein resultant from the transmission of the first and second complex sequences.

Description

technical field [0001] The present invention relates to mobile wireless terminals, such as but not limited to the mobile wireless terminals described in "3GPP TS 25.211 3.7.0 (2001-06) Technical Specification", and the entire content of this specification is hereby incorporated for reference. Background technique [0002] In general background, the aforementioned 3GPP Technical Specification defines the use of radio frames of 15 slots each for wireless transmission to mobile data receivers. Each frame is 38,400 chips long and each slot is 2,560 chips. [0003] The Common Downlink Physical Channels in the Technical Specification consist of a Common Pilot Channel (CPICH) which carries the predefined bit / symbol sequences described in Section 5.3.3.1. The CPICH channel may use two space-diverse antennas, which transmit the first and second complex sequences, respectively. The CPICH channel is transmitted from both antennas using the same channelization and scrambling code, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00H04Q7/20H04B1/16H04B1/7093H04B1/7117H04B7/06
CPCH04B1/7093H04B1/7117H04B7/06
Inventor K·扬森J·科伊维斯托
Owner NOKIA TECH OY