Digital wireless receiver using antenna diversity method

An antenna diversity digital wireless receiver for use in a communication system including a transmitter and an associated receiver sharing a single radio frequency channel, said receiver receiving said radio frequency channel all the time, said antenna diversity digital wireless receiver comprising:

• a plurality of receiving antennas for receiving a digital modulated signal from said transmitter, said digital modulated signal comprising a carrier signal of said radio frequency channel modulated with successively generated digital signal trains;
• antenna selecting means for selecting one of said antennas in response to a selection signal;
• receiving and demodulating means receiving and demodulating said digital modulated signal that said antenna selected by said antenna selecting means receives;
• level detecting means providing a reception level indicative signal indicative of the reception level of the digital modulation signal;
• control means comparing said reception level indicative signal with a threshold value and changing said selection signal in accordance with the result of the comparison;
• and
• muting means;
• wherein said digital signal trains comprise a plurality of successive frames, each frame including error-correction coded information data, a preamble section preceding said information data for establishing synchronization of said information data, and a guard bit section succeeding said information data section;
• the change of said selection signal done by said control means and the antenna selection done by said antenna selecting means are effected each time said guard bit section is received;
• said receiving and demodulating means performs error-correction for said information data and also determines a bit error rate;
• and
• when said bit error rate is larger than a predetermined bit error rate threshold value, said control means causes said muting means to operate.