Wireless receiver and method for wireless reception

Abstract

A wireless receiver includes a radio frequency (RF) receiving unit and a baseband receiving unit. A first path of the RF receiving includes a first filter, and is arranged for receiving an input RF signal and generating a first baseband input signal; a second path is arranged for receiving the input RF signal and generating a second baseband input signal. The baseband receiving unit is arranged for receiving the first baseband input signal and the second baseband input signal to generate a baseband decoded signal. One of the first path and the second path is an in-phase path, and the other is a quadrature-phase path. When the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path to receive the input RF signal.

What is claimed is: 
     
       1. A wireless receiver, for receiving an input radio frequency (RF) signal and outputting a baseband decoded signal, comprising:
 a RF receiving unit, comprising:
 a first path, for receiving the input RF signal and generating a first baseband input signal, the first path comprising a first filter, wherein a bandwidth of the first filter is broader than a bandwidth of a packet of the input RF signal; 
 a second path, for receiving the input RF signal and generating a second baseband input signal; and 
 
 a baseband receiving unit, for receiving the first baseband input signal and the second baseband input signal to generate the baseband decoded signal; 
 wherein the first path is an in-phase path, and the second path is a quadrature-phase path, and when the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path or the second path to receive the input RF signal. 
 
     
     
       2. The wireless receiver of  claim 1 , wherein the bandwidth of the first filter is at least twice broader than a bandwidth of the packet of the input RF signal, and the bandwidth of the first filter covers a plurality of sub-channels, wherein one of the plurality of sub-channels is utilized for receiving the packet of the input RF signal. 
     
     
       3. The wireless receiver of  claim 1 , wherein when the wireless receiver is in an idle status, the RF receiving unit operates in the first mode. 
     
     
       4. The wireless receiver of  claim 1 , wherein when the RF receiving unit operates in a second mode, the RF receiving unit uses the first path and the second path to receive the input RF signal. 
     
     
       5. The wireless receiver of  claim 4 , wherein the second path comprises a second filter, and a bandwidth of the second filter is broader than the bandwidth of the packet of the input RF signal. 
     
     
       6. The wireless receiver of  claim 4 , wherein when the wireless receiver is in an idle status, the RF receiving unit operates in the first mode; and wherein when the wireless receiver is in a packet receiving status, the RF receiving unit operates in the second mode. 
     
     
       7. The wireless receiver of  claim 4 , wherein the wireless receiver determines whether the input RF signal is detected or not, and the RF receiving unit switches to the second mode according to the determined result. 
     
     
       8. The wireless receiver of  claim 4 , wherein the RF receiving unit receives a control signal generated by the baseband receiving unit via one of a Low-Speed Serial Interface (LSSI), a High-Speed Serial Interface (HSSI), and a direct-write control, and switches between the first mode and the second mode according to the control signal. 
     
     
       9. The wireless receiver of  claim 4 , wherein the wireless receiver performs a Carrier Frequency Offset (CFO) compensation in the second mode. 
     
     
       10. The wireless receiver of  claim 1 , wherein the input RF signal is modulated by a Complementary Code Keying (CCK) modulation. 
     
     
       11. The wireless receiver of  claim 1 , wherein the input RF signal is processed by an Orthogonal Frequency Division Multiplexing (OFDM). 
     
     
       12. A wireless receiving method, for receiving an input radio frequency (RF) signal and outputting a baseband decoded signal, comprising:
 utilizing a first path in a RF receiving unit to receive the input RF signal and generate a first baseband input signal, wherein the first path comprises a first filter and a bandwidth of the first filter is broader than a bandwidth of a packet of the input RF signal; 
 utilizing a second path in a RF receiving unit to receive the input RF signal and generate a second baseband input signal; and 
 utilizing a baseband receiving unit to receive the first baseband input signal and the second baseband input signal to generate the baseband decoded signal; 
 wherein the first path is an in-phase path, and the second path is a quadrature-phase path, and when the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path or the second path to receive the input RF signal. 
 
     
     
       13. The wireless receiving method of  claim 12 , wherein the bandwidth of the first filter is at least twice broader than a bandwidth of the packet of the input RF signal, and the bandwidth of the first filter covers a plurality of sub-channels, wherein one of the plurality of sub-channels is utilized for receiving the packet of the input RF signal. 
     
     
       14. The wireless receiving method of  claim 12 , wherein when the wireless receiver is in an idle status, the RF receiving unit operates in the first mode. 
     
     
       15. The wireless receiving method of  claim 12 , wherein when the RF receiving unit operates in a second mode, the RF receiving unit uses the first path and the second path in the same time to receive the input RF signal. 
     
     
       16. The wireless receiving method of  claim 15 , wherein the second path comprises a second filter; and a bandwidth of the second filter is broader than the bandwidth of the packet of the input RF signal. 
     
     
       17. The wireless receiving method of  claim 15 , wherein when the wireless receiver is in an idle status, the RF receiving unit operates in the first mode; and when the wireless receiver is in a packet receiving status, the RF receiving unit operates in the second mode. 
     
     
       18. The wireless receiving method of  claim 15 , wherein the RF receiving unit receives a control signal generated by the baseband receiving unit via one of a Low-Speed Serial Interface (LSSI), a High-Speed Serial Interface (HSSI), and a direct-write control, and switches between the first mode and the second mode according to the control signal. 
     
     
       19. The wireless receiving method of  claim 15 , wherein the wireless receiver performs a Carrier Frequency Offset (CFO) compensation in the second mode. 
     
     
       20. The wireless receiving method of  claim 12 , wherein the input RF signal is processed by a Complementary Code Keying (CCK) modulation or an Orthogonal Frequency Division Multiplexing (OFDM).