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Method for emitting diversity code via common pilot channel

A technology of common pilot channel and coding method, which is applied in the coding field of common pilot channel transmit diversity, and can solve problems such as inability to realize transmit diversity of multiple antennas

Inactive Publication Date: 2003-02-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] This method has certain limitations, and it cannot realize the transmit diversity of multiple antennas. If multiple antennas (such as 4 antennas) are used, there is no corresponding solution

Method used

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  • Method for emitting diversity code via common pilot channel
  • Method for emitting diversity code via common pilot channel
  • Method for emitting diversity code via common pilot channel

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Embodiment Construction

[0023] This embodiment is to realize the coding of the common pilot channel for transmitting diversity of four antennas. A radio frame has 15 time slots, each time slot has 10 symbols, and a frame has 150 symbols in total. Since the frame is a period of encoding, 150 cannot be divisible by 4. Therefore, the encoding method of the present invention is based on two radio frames. It is a period, that is, a total of 300 symbols in two frames are used as period coding, which can be divisible by 4. Using the Walsh function generation method, the four consecutive symbol bits are used as a unit to perform orthogonal coding, with a double frame as the cycle, and the combination of 30 time slots in the two frames is shown in Table 2.

[0024] frame

[0025] Every 4 symbols are coded as a unit, and orthogonal codes are allocated to the four antennas, so that the common pilot channel definition sequences are mutually orthogonal. Suppose antenna 1 is "AAAA", then antenna 2 is "A-A-A...

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Abstract

An emit diversity encoded method for common pilot channel of several antennas in WCDMA system features that 2 to the power n-1 radio frames are used as one encode period and Walsh function is used for orthogonal encode of continuous 2 to the power n sign bits as one unit, and distributing it to several antennas.

Description

Technical field [0001] The present invention relates to a coding method for a common pilot channel, and in particular to a method used in the transmission diversity technology of a wideband code division multiple access (WCDMA) communication system to realize the transmission diversity of the common pilot channel between multiple antennas. Encoding method. Background technique [0002] As we all know, in the WCDMA mobile communication system, the wireless interface is composed of wireless frames in the time domain. Each wireless frame is 10 milliseconds in length and is composed of 15 time slots of equal length. Because the rate of WCDMA modulation chip is 38400 chips per Frame, then each slot is 2560 chips. The common pilot channel uses a spreading factor of 256, so each time slot has 10 symbol bits (2560 / 256=10). [0003] In the WCDMA mobile communication system, in order to enhance the performance of the wireless link, multiple antennas are used for di...

Claims

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Application Information

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IPC IPC(8): H04B1/76H04B7/02H04J13/12
Inventor 吕武
Owner HUAWEI TECH CO LTD
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