Dual code spread spectrum communication system with transmit antenna diversity

A technology of communication system and transmit diversity, which is applied in the field of transmitters and can solve problems such as not using multipath effects

Inactive Publication Date: 2002-08-07
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
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  • Claims
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  • Dual code spread spectrum communication system with transmit antenna diversity
  • Dual code spread spectrum communication system with transmit antenna diversity
  • Dual code spread spectrum communication system with transmit antenna diversity

Examples

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[0015] Example

[0016] figure 1 The wireless local area network in includes a wireless remote controller RC and at least two separate transceivers TR, TR', these transceivers and separate input / output devices such as televisions, Hi-Fi systems, set-top boxes or personal computers Connected or integrated with these devices.

[0017] Because the transceivers TR and TR' are the same, only the transceiver TR will be described in detail, and the same reference numerals indicating the same parameters are also used to indicate the corresponding parts of the transceiver TR'.

[0018] A transmitter (Tx) 10 and a receiver (Rx) 12 are connected to a processor 14 which controls the Tx 10 and Rx 12 and processes data relayed to or received from the input / output device 16. Tx10 is a dual-code spread spectrum transmitter using transmit vector diversity, where each symmetrical signal group is propagated by separate antennas 18, 20. Multiple antennas ANT1 to ANTn (where n is an integer greater ...

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Abstract

A communication system comprises a wireless local area network formed by a plurality of spacially separated transceivers (TR, TR'). Each of the transceivers has a transmitting section (10) for transmitting data by a combination of dual code spread spectrum techniques with transmit diversity. More particularly an input data stream is split into quadrature related channels (I,Q). Each of the channels comprises a frequency up-converter (42, 44, 46), a spread spectrum stage (50, 52) for spreading the up-converted channel signal by a respective one of two parallel produced PN codes (PN1, PN2) and an antenna (18, 20) being located where convenient in the coverage area of the respective transmitting section.

Description

Technical field [0001] The present invention relates to a communication system and a transmitter used in the system. This communication system is particularly but not only applied in local and local area short-range wireless local area networks (LANs). Background technique [0002] Short-range wireless local area networks (LANs) based on protocols such as Bluetooth and HomeRF (HomeRF) usually work in the 2.4GHZ ISM (industrial, scientific, and medical applications) frequency band. This frequency band also has other applications such as radio frequency heating. The problems that arise in such systems are frequency selective multipath and co-channel interference. These problems may affect the positioning of the antennas, and users of the local network want these antennas to be in an aesthetically discrete position. [0003] Some diversity and multiplexing mode radio communication systems have been proposed to resist multipath propagation channels. Recently, the characteristics of m...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/7115H04B7/06H04B7/08
CPCH04B7/0848H04B7/0613H04J13/0022H04L12/28
Inventor S·I·纳姆
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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