Dual-mode communication chip of OFDM carrier wave mode and GFSK wireless mode

Abstract

The invention discloses a dual-mode communication chip of an OFDM power line carrier wave mode and a GFSK wireless mode. The dual-mode communication chip uses an OFDM modulation technique suitable for carrier wave meter reading and a GFSK modulation technique suitable for wireless meter reading simultaneously; the single dual-mode communication chip integrates a dual mode analog front end receiving circuit, a dual-mode modulation demodulator, a dual-mode carrier wave sensing collision detection CSMA unit, a CRC verification and forward error correction FEC unit, a storage and an interface unit, an sigma delta modulator, a phase-locked loop unit and a power amplifier unit, wherein the dual-mode analog front end receiving circuit comprises a frequency conversion and amplifying unit, a filtering unit and a analog-digital converter, and the dual-mode modulation demodulator comprises an OFDM modulation demodulator and a GFSK modulation demodulator. The integration level of the dual-mode communication chip is high, the single dual-mode communication chip can not only achieve the utilization of power line communication in an OFDM modulation manner, but also achieve the utilization of wireless communication in a GFSK modulation manner, the complexity of a system is lowered, and the success probability of meter reading of the electricity information collection system can be effectively improved.

Description

technical field [0001] The present invention relates to dual-mode communication technology, in particular to a dual-mode communication technology of OFDM power line communication and GFSK wireless communication Background technique [0002] The traditional single-mode communication method is mainly used for electricity consumption information collection, and the mainstream technologies mainly include power line communication and micro-power wireless communication. [0003] Power line communication is the use of low-voltage power line distribution network for carrier communication, which has low cost and has become one of the main ways of smart meter reading. In power line carrier communication, in order to obtain higher rate and anti-narrowband interference, adopt orthogonal frequency division multiplexing (OFDM). OFDM divides information into several parallel data streams, and then modulates the data onto a single subcarrier that is orthogonal to each other for transmissio...

AI Technical Summary

Problems solved by technology

[0004] However, as a communication medium, power lines have many non-ideal factors: strong time variation, large equivalent impedance transformation range, large channel attenuation, strong interference and noise, etc.

With the continuous increase of the types of electrical equipment, various frequency conversion electrical appliances and high-power electrical appliances are used more and more. OFDM carrier communication cannot communicate normally under some conditions, especially under heavy load or strong interference conditions.

[0005] Micro-power wireless communication uses wireless channels as the communication medium, which is not affected by various non-ideal factors of the power line, and the communication effect is very good in various environments with heavy loads and strong interference. Where there are many walls, communication cannot be done normally

Images