Transmitting apparatus, receiving apparatus and communication system

Abstract

A transmitting apparatus, receiving apparatus and communication system are disclosed, and great improvement in an S/N ratio, preventing an actual throughput from decreasing, and preventing the number of circuits for synchronizing spread spectrum signals from increasing can be expected at the receiving apparatus side. The transmitting apparatus includes a pulse generating circuit, pulse repetition cycle determining circuit, peak power determining circuit, and modulator. The pulse generating circuit generates pulse strings, pulse repetition cycle determining circuit determines, based on a clock signal, a pulse repetition cycle of the pulse string generated by the pulse generating circuit. The peak power determining circuit determines a pulse peak power of the pulse string. The modulator modulates the pulse string with transmission data, and then generates a transmission signal.

1 . A transmitting apparatus comprising:
 a pulse generating circuit that generates a pulse string while differentiating a peak power of a portion of the pulse string from a peak power of an other portion of the pulse string; and   a modulator that modulates the portion of pulse string by a first type of data.   
     
     
         2 . The transmitting apparatus according to  claim 1  wherein,
 the modulator modulates the other portion of the pulse string by a second type of data. 
 
     
     
         3 . The transmitting apparatus according to  claim 1  wherein
 the pulse generating circuit generates a plurality of pulse strings while keeping an average transmission power of the pulse string including the portion and the other portion, constant. 
 
     
     
         4 . The transmitting apparatus according to  claim 1  further comprising:
 a timer circuit for designating the portion as a function of a time interval; and 
 wherein, the pulse generating circuit generates the pulse string while differentiating the peak power for the portion designated by the timer circuit. 
 
     
     
         5 . The transmitting apparatus according to  claim 4  further comprising;
 a random timing generating circuit for designating the portion while changing the interval; and 
 wherein the pulse generating circuit generates the pulse string while differentiating the peak power for the portion designated by the random timing generating circuit. 
 
     
     
         6 . The transmitting apparatus according to  claim 2  wherein,
 the first type data is a data required to initialize a communication to another device, and 
 the pulse generating circuit allocates a greater peak power to the portion of the pulse string than that of the other portion. 
 
     
     
         7 . The transmitting apparatus according to  claim 6  wherein,
 the first type of data is a data containing any one of the following information: 
 (a) a sync information to be used to reproduction of clock in a receiver; 
 (b) a communication requesting information; and 
 (c) a device recognizing information. 
 
     
     
         8 . The transmitting apparatus according to  claim 1  further comprising,
 a receiving unit operable to receive a feedback information sent from an apparatus to which the first type data has been sent; and 
 the pulse generating circuit adaptively adjusts either of the peak power or the portion of the pulse string according to the feedback information. 
 
     
     
         9 . The transmitting apparatus according to  claim 8  wherein,
 the feedback information includes a data related to jitter; and 
 wherein the pulse generating circuit allocates a greater peak power when the data indicates the greater jitter. 
 
     
     
         10 . The transmitting apparatus according to  claim 8  wherein,
 the feedback information includes a data related to control either one of: 
 (a) the peak power; and 
 (b) the interval. 
 
     
     
         11 . A transmitting apparatus comprising:
 a pulse generating circuit for generating a pulse string including large pulses and small pulses, the large pulses having greater pulse peak power than the small pulses;   a pulse repetition cycle determining circuit for determining   (i) a pulse repetition cycle of the pulses in the pulse string based on a clock signal, and   (ii) an interval during which the large pulses are transmitted according to an information;   a peak power determining circuit for determining the peak power of the pulses depending to the interval determined; and   a modulator for modulating the pulses in the pulse string with transmission data including a first data for generating a radio frequency (RF) transmission signal so that the interval during which the large pulses are transmitted is controlled based on a type of the transmission data or a status of the wireless communication path between the transmitting apparatus and a receiving apparatus receiving the pulses.   
     
     
         12 . A wireless communication apparatus comprising:
 a receiving unit, including
 a reception status estimating circuit for estimating a communication quality between another wireless communication apparatus based on an information received sent from the another wireless communication apparatus, and 
   a transmitting unit transmitting a radio frequency (RF) transmission signal including
 a pulse string having large pulses and small pulses, the large pulses having greater pulse peak power than the small pulses, the transmitting unit including, 
 a pulse repetition cycle determining circuit for determining a pulse repetition cycle of the pulse string, 
 a peak power determining circuit for determining the pulse peak power of the pulses, 
 wherein the pulse repetition cycle determining circuit and the peak power determining circuit determine the pulse repetition cycle and the pulse peak power.