Base station transceiver for frequency hopping code division multiple access system

• US 6,396,823 B1
• Filed: 12/29/1998
• Issued: 05/28/2002
• Est. Priority Date: 12/29/1997
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Je-Woo, Park, Jong-Hyeon
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): PHAN, TRI H
• Application Number:
  US09/222,669
• Time in Patent Office: 1,246 Days
• Field of Search: 370/277,328,330,334,335,336,337,342,343,345,347 375/131,132,133,260,295,305,300 455/73,561,451,452,562
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A small and lightweight base station transceiver utilizes a plurality of low-powered time division duplexing switches instead of a single high-powered time division duplexing switch. The base station transceiver includes a forward signal path, a reverse signal path, and a plurality of time division duplexing switches being switchable to the forward signal path or the reverse signal path according to a time division duplexing timing control signal generated from a time division duplexing timing controller. The plurality of time division duplexing switches corresponds to N time division duplexing switches where the symbol N represents a number. Output signals of the time division duplexing switches are filtered in a plurality of N bandpass filters, coupled in a junction coupler, and then radiated in the air through first and second antennas. The junction coupler couples the outputs of odd-numbered bandpass filters to transfer the coupled signals to the first antenna, and couples the outputs of even-numbered bandpass filters to transfer the coupled signal to the second antenna, so as to reduce mutual interference among the channels.

Claims

1. An apparatus, comprising:

a plurality of first preprocessing units receiving and then scrambling first control data, signal data, and traffic data, packetizing the scrambled data to divide the scrambled data into packets, generating frequency control data controlling hopping frequencies, and outputting said packetized data and said frequency control data;

a first signal switch switching said packetized data and said frequency control data output from said plurality of first preprocessing units, and outputting primary signals corresponding to said switched data;

a plurality of first postprocessing units lowpass-filtering said primary signals output from said first signal switch, frequency modulating said lowpass-filtered signals with a secondary signal synthesizing transmission frequency, and filtering and amplifying said frequency modulated signals at a transmission frequency band;

a selection unit selecting a path from among a transmission path and a reception path;

a plurality of second preprocessing units demodulating received signals selected by said selection unit with a tertiary signal synthesizing reception frequency to restore clock and data, and detecting a received signal strength indication signal;

a second signal switch switching signals output from said plurality of second preprocessing units;

a plurality of second postprocessing units measuring signal-to-noise ratios of signals output from said second signal switch, and de-packetizing and unscrambling said signals output from said second signal switch to divide said signals into said first control data, said signal data, and said traffic data; and

a control unit being coupled to said selection unit and generating a timing control signal utilizing time division duplexing to control said selection unit wherein said apparatus corresponds to a base station transceiver for a frequency hopping code division multiple access system.

2. The apparatus of claim 1, wherein said first control data and signal data received by said plurality of first preprocessing units correspond to Bose-Chaudhuri-Hocquenghem encoded control data and Bose-Chaudhuri-Hocquenghem encoded signal data respectively.

3. The apparatus of claim 1, wherein said traffic data received by said plurality of first preprocessing units correspond to interleaved traffic data.

4. The apparatus of claim 1, wherein said first control data, said signal data, and said traffic data received by said plurality of first preprocessing units are conveyed on a forward path corresponding to the transmission path.

5. The apparatus of claim 4, wherein said plurality of first preprocessing units, said first signal switch, and said plurality of first postprocessing units are coupled in the forward path corresponding to the transmission path.

6. The apparatus of claim 1, wherein said received signals received by said selection unit are conveyed on a reverse path corresponding to the reception path.

7. The apparatus of claim 6, wherein said plurality of second preprocessing units, said second signal switch, and said plurality of second postprocessing units are coupled in the reverse path corresponding to the reception path.

8. The apparatus of claim 1, wherein said selection unit is selectively coupled to units chosen from among said first postprocessor units and said second preprocessor units in accordance with said timing control signal received from said control unit.

9. The apparatus of claim 1, said plurality of first preprocessor units corresponding to N first preprocessor units, said plurality of first postprocessor units corresponding to N first postprocessor units, said plurality of second preprocessor units corresponding to N second preprocessor units, and said plurality of second postprocessor units corresponding to N second postprocessor units, wherein the symbol N represents a number.

10. The apparatus of claim 9, wherein said first signal switch further comprises:

a plurality of N first demultiplexers respectively demultiplexing first to Nth channel transmission data respectively output from said N first preprocessing units, said first to Nth channel transmission data corresponding to said packetized data;

a plurality of N second demultiplexers respectively demultiplexing first to Nth hopping frequencies respectively output from said N first preprocessing units, said first to Nth hopping frequencies corresponding to said frequency control data;

a plurality of registers storing frequency band information controlling said N first demultiplexers and said N second demultiplexers;

a plurality of N first digital OR gates respectively generating output data from outputs of said N first demultiplexers; and

a plurality of N second digital OR gates respectively generating first to N-th output hopping frequencies from outputs of said N second demultiplexers.

11. An apparatus, comprising:

a plurality of N forward preprocessors respectively processing transmission signals of a plurality of N channels, wherein the symbol N represents a number corresponding to a quantity;

a forward signal switch switching said transmission signals to unused channels;

a plurality of N forward postprocessors processing output signals of said forward signal switch;

a plurality of N time division duplexing switches being switchable to a path selected from among a forward signal path and a reverse signal path according to a timing control signal utilizing time division duplexing, said N time division duplexing switches respectively receiving said processed signals output from said N forward postprocessors;

a timing controller generating said timing control signal;

a plurality of N bandpass filters bandpass-filtering output signals of said time division duplexing switches;

a junction coupler coupling output signals of said bandpass filters;

first and second antennas transmitting coupled signals output from said junction coupler, and receiving radio signals;

said bandpass filters bandpass-filtering said radio signals received through said first and second antennas;

said time division duplexing switches switching said radio signals to the reverse signal path according to said timing control signal;

a plurality of N reverse preprocessors processing output signals of said time division duplexing switches;

a reverse signal switch switching the processed signals output from said reverse preprocessors to unused channels;

a plurality of N reverse postprocessors processing the switched signals output from said reverse signal switch, wherein said apparatus corresponds to a base station transceiver for a frequency hopping code division multiple access system.

12. The apparatus of claim 11, said processing of said transmission signals performed by said plurality of forward preprocessors corresponds to scrambling Bose-Chaudhuri-Hocquenghem encoded control data and scrambling Bose-Chaudhuri-Hocquenghem encoded signal data.

13. The apparatus of claim 12, wherein said scrambling randomizes data bits.

14. The apparatus of claim 11, wherein said junction coupler couples the outputs of odd-numbered bandpass filters to transfer the coupled signals to said first antenna, and couples the outputs of even-numbered bandpass filters to transfer the coupled signals to said second antenna, so as to reduce mutual interference among the channels.

15. A method, comprising:

receiving and then scrambling first control data, signal data, and traffic data, packetizing the scrambled data to divide the scrambled data into packets, generating frequency control data controlling hopping frequencies, and outputting said packetized data and said frequency control data;

switching said packetized data and said frequency control data, and outputting primary signals corresponding to said switched data, said switching of said packetized data and said frequency control data being performed by a first signal switch;

lowpass-filtering said primary signals, frequency modulating said lowpass-filtered signals with a secondary signal synthesizing transmission frequency, and filtering and amplifying said frequency modulated signals at a transmission frequency band;

selecting a path from among a transmission path and a reception path, said selecting being performed by a plurality of special switches;

demodulating received signals when the reception path is selected, said demodulating being performed with a tertiary signal synthesizing reception frequency to restore clock and data, and detecting a received signal strength indication signal;

switching demodulated received signals and outputting switched signals, said switching of said demodulated received signals being performed by a second signal switch;

measuring signal-to-noise ratios of said switched signals, and de-packetizing and unscrambling said switched signals to divide said signals into said first control data, said signal data, and said traffic data; and

generating a timing control signal utilizing time division duplexing to control said selecting of said path by said plurality of special switches, wherein said method corresponds to operations of a base station transceiver for a frequency hopping code division multiple access system.

16. The method of claim 15, wherein said first control data and said signal data correspond to Bose-Chaudhuri-Hocquenghem encoded control data and Bose-Chaudhuri-Hocquenghem encoded signal data respectively.

17. The method of claim 15, wherein said traffic data correspond to interleaved traffic data.

18. The method of claim 15, further comprising:

first demultiplexing first to Nth channel transmission data, said first to Nth channel transmission data corresponding to said packetized data, said first demultiplexing being performed by a first plurality of N demultiplexers;

second demultiplexing first to Nth hopping frequencies, said first to Nth hopping frequencies corresponding to said frequency control data, said second demultiplexing being performed by a second plurality of N demultiplexers;

storing frequency band information controlling said N first demultiplexers and said N second demultiplexers;

generating output data from outputs of said N first demultiplexers; and

generating first to Nth output hopping frequencies from outputs of said N second demultiplexers.

19. The method of claim 15, wherein said plurality of special switches correspond to a plurality of low powered time division duplexing switches.

20. The method of claim 15, wherein said special switches do not have a high coupling loss.