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Wireless communication system

A multi-path, character technology, applied in transmission systems, digital transmission systems, orthogonal multiplexing systems, etc., can solve the problems of complex hardware and long processing time, a large number of complex hardware and complex operations, and high power consumption.

Inactive Publication Date: 2005-11-30
INTEGRATED SYST SOLUTION
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, Weberscher's architecture requires a large number of complex hardware and complex operations (complex multiplication and addition required for complex convolution and complex correlation)
Therefore, to implement the embodiment of Webescher's Figs. 12-14, significant power consumption, complex hardware and long processing times are required

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Embodiment Construction

[0035] The best mode for carrying out the present invention is described below. This description is not intended to limit the present invention, but only to describe the general principles of the embodiments of the present invention. The scope of the present invention is defined by claims. In some instances, prior art devices, elements, mechanisms and methods are omitted so as not to obscure the description of the present invention.

[0036] A simplified 802.11b packet format is shown in Figure 1, which includes two modes of operation. The preamble (mode 1) of the packet is Barker-encoded, and the data portion (mode 2) is modulated with Complementary Code Keying (CCK) to provide encoded CCK bits. Since the two modes are not operated at the same time, the hardware of modes 1 and 2 can be shared to reduce hardware complexity.

[0037] A receiver 20 is shown in FIG. 2 . The 802.11b transmitter transmits one data packet at a time to the receiver 20 for processing. When transm...

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Abstract

An optimal algorithmic structure is provided for use in a RAKE receiver to compute multipath interferences (MPIs) required for canceling intra-codeword chip interference (ICI). The algorithmic structure is similar to the optimal architecture required for CCK correlation computations. The similarity between these two structures allows for the use of the same hardware at different times to compute MPIs and to compute the CCK correlation of a plurality of possible codewords.

Description

technical field [0001] The present invention relates to a wireless communication system, but not limited to a wireless local area network (WLAN), and more particularly to an 802.11b receiver including a fast multipath interference cipher ( Fast MultipathInterference Cipher, FMIC) Packet CCK demodulator without multiplication. Background technique [0002] U.S. Patent Publication No. 2001 / 0036223 to Webster et al. discloses a RAKE receiver for indoor multipath WLANs with direct spread spectrum signals with very short symbol code lengths middle. The RAKE receiver has an embedded feedback-determined equalizer structure in the signal processing path between the receiver channel matched filter and the word code correlator. The feedback determines that the equalizer is used to offset inter-codeword interference (ICI, inter-codewordinterference) (also known as inter-symbol interference (ISI) (that is, excessive emission between CCK character codes) -over)). [0003] Figures 12-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04J11/00H04L23/02
CPCH04B1/7105H04B1/712H04L23/02H04B2001/70935H04B1/7113H04B1/7115
Inventor 陈政宏彭蔚中
Owner INTEGRATED SYST SOLUTION