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Block level space time transmit diversity in wireless communications

a technology of block level space time and transmit diversity, applied in the direction of pulse technique, electromagnetic wave modulation, polarisation/directional diversity, etc., can solve the problem of high overhead associated with their implementation, the well-known disadvantageous phenomenon of fading, and the expense of throughpu

Inactive Publication Date: 2005-03-17
INTEL CORP
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AI Technical Summary

Problems solved by technology

A disadvantage of these protocols is the high overhead associated with their implementation.
These schemes help correct data errors, but at the expense of throughput.
In wireless communication systems such as described above, the well-known disadvantageous phenomenon of fading is encountered.
However, bit level space time transmit diversity cannot be used in wireless communication systems that utilize non-linear modulation schemes, for example the GFSK modulation scheme utilized in Bluetooth systems.

Method used

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  • Block level space time transmit diversity in wireless communications
  • Block level space time transmit diversity in wireless communications
  • Block level space time transmit diversity in wireless communications

Examples

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Embodiment Construction

[0016]FIG. 1 diagrammatically illustrates pertinent portions of exemplary embodiments of a transmitting station according to the invention. For example, the transmitting station of FIG. 1 could be a Bluetooth master or slave device. In FIG. 1, input digital information bits are applied to a block formatter 11 which establishes from the input bits an original block of bits having two parts x1 and x2, shown generally at 12. Parts x1 and x2 each include a plurality of bits. The two-part block of bits 12 is input to a nonlinear modulator such as an FSK (or GFSK) modulator 13 which uses conventional techniques to modulate a carrier signal with the block of bits to produce at 14 a modulated block of information including a first part a and a second part b which respectively correspond to the parts x1 and X2 at 12.

[0017] The two-part modulated block at 14 is input to an STTD encoder 15 which outputs at 9 a re-ordered two part block including a first part −b* which represents the negative ...

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Abstract

Space time transmit diversity (9, 14, 17, 19) is applied at the block level to an original block of bits (12) in order to reduce the effects of fading in wireless communication systems that use nonlinear modulation schemes (13, 33). At the receiving end, fading parameters (α1, α2) are estimated (αE1, αE2) and the properties of complex conjugates are utilized (28, 29, 201, 202) to produce a result (r1, r2) that is representative of the original block of bits.

Description

BACKGROUND OF THE INVENTION [0001] Present telecommunication system technology includes a wide variety of wireless networking systems associated with both voice and data communications. An overview of several of these wireless networking systems is presented by Amitava Dutta-Roy, Communications Networks for Homes, IEEE Spectrum, pg. 26, December 1999. Therein, Dutta-Roy discusses several communication protocols in the 2.4 GHz band, including IEEE 802.11 direct-sequence spread spectrum (DSSS) and frequency-hopping (FHSS) protocols. A disadvantage of these protocols is the high overhead associated with their implementation. A less complex wireless protocol known as Shared Wireless Access Protocol (SWAP) also operates in the 2.4 GHz band. This protocol has been developed by the HomeRF Working Group and is supported by North American communications companies. The SWAP protocol uses frequency-hopping spread spectrum technology to produce a data rate of 1 Mb / sec. Another less complex prot...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L1/06H04L27/10
CPCH04B7/0669H04L27/10H04L1/0618
Inventor NAFIE, MOHAMMEDDABAK, ANAND G.
Owner INTEL CORP
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