Digital receiver of modulated signal capable of processing various kinds of data rate

Abstract

A digit receiver processing modulated signals with multiple data rates includes a sample circuit for receiving modulated signals and outputting digitalized sample signals, a matched filter removing noises from the digitalized modulation signals with first and second data rates and generating same phase signals and phase orthogonal signals, a barker code correlator, a frequency band averager, counter measuring interference of the same band a CCK correlator, coupled to the said averager decoding signals with second and third data rates, a first and second quantification filters.

Description

technical field [0001] The present invention relates generally to a spread spectrum communication system, and more particularly to a digital receiver designed with solutions for processing modulated signals having various data rates in a spread spectrum communication system tune unit. Background technique [0002] IEEE 802.11 wireless local area network (wireless LAN) is the most popular high-speed wireless communication network system today. IEEE 802.11 WLAN uses Orthogonal Frequency Division Multiplexing (OFDM) technology as the main frequency modulation technology. OFDM introduces a multi-carrier modulation technique to encode data bits into multiple sub-carriers. Unlike a single-carrier modulation system, all frequencies in an OFDM system are transmitted synchronously in time. Compared with single-carrier modulation systems, OFDM is in terms of multipath effect immunity, simple channel equalization, and relaxed timing acquisition constraints. Several advantages are p...

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Problems solved by technology

When the modulated signal is transmitted through a multi-path channel, it is very likely that part of the modulated signal cannot be accurately restored to the original data stream due to the mismatch between the demodulation units.

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