Development of 2.4 GHz wireless VoIP transmitter and receiver

GE Hai-jiang
（Department of Communication and Electronic， Hangzhou Vocational & Technical College， Hangzhou 310018，China）

Abstract： Aiming at discontinuous data stream caused by wireless packet lose at traditional VoIP communications，a method of wireless VoIP transmitter and receiver based on 2.4 GHz was put forward. Wireless VoIP hardware design，wireless communication protocol and firmware design were expounded in detail. The wireless VoIP hardware was realized by the combination of Winbond audio codec and Wireless USB. A PCM converted to ADPCM encoding to effective compression of acoustic data was presented. Comparing with single-antenna，the problems brought by the packet losses were solved through the combination of dual-antenna. In addition，an effective way of increasing RF transmitting power was proposed. The results indicate that the technique based on 2.4 GHz wireless VoIP is suitable for short-range wireless audio communication．
Key words： wireless VoIP； transmitter； receiver； codec； ADPCM； double antenna design