Radio communication system employing a spread-spectrum technique

Details Radio communication system employing a spread-spectrum technique Radio communication system employing a spread-spectrum technique

1998-01-27

2000-04-18

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

370209, 370342, 370335, H04B 1707

Patent

active

060524049

ABSTRACT:
In a radio communication system operating according to spread-spectrum techniques, data sequences of a number of communication channels are respectively spread with different orthogonal code sequences and are subsequently multiplied by a pseudo-random noise sequence. The parallel bit streams produced by this multiplication are supplied to a mapping memory in which an allocation rule--defined by the type of modulation being employed--is stored. This mapping memory produces respectively allocated I and Q values into the mapping memory from the bits read synchronously. These I and Q values are read from the mapping memory and are filtered in respective FIR filters and are then supplied to a quadrature modulator as baseband signals. Since the mapping memory emits only two sets of values (the I values and the Q values), only two FIR filters are needed.

REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5309474 (1994-05-01), Gilhousen et al.
patent: 5799010 (1998-08-01), Lomp et al.
patent: 5881056 (1999-03-01), Huang et al.

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