Dual carrier modulator for a multiband OFDM UWB transceiver
First Claim
1. A dual carrier modulator (DCM) for a multiband orthogonal frequency division multiplexing (OFDM) transceiver of an ultra wide band (UWB) wireless network transmitting OFDM modulated symbols, wherein each OFDM symbol is modulated by a first predetermined number (NCBPS) of encoded bits, said dual carrier modulator comprising:
- (a) a grouping unit configured to group the NCBPS encoded bits of a serial bit stream into bit groups each having a second predetermined number (m) of bits;
(b) a mapping unit configured to map each bit group received from said grouping unit to complex symbols (y); and
(c) a reordering unit configured to reorder the complex symbols (y) mapped by said mapping unit, wherein each complex symbol (y) is provided to modulate a corresponding data tone of an OFDM symbol;
wherein the first predetermined number is two hundred (NCBPS=200) and the second predetermined number is four (m =4), such that the grouping unit groups two hundred encoded bits to bit groups each having four bits;
wherein the mapping unit maps bit groups each having four bits respectively to two complex symbols (yn;
yn+NCBPS/4) to generate NCBPS/2 complex symbols (y0. . . yNCBPS/2) for modulating one NCBPS/2 data tones of an OFDM symbol;
wherein the mapping unit (1-2) comprises;
a first mapping stage for mapping unipolar bit values of the encoded bits within each bit group to bipolar bit values, anda second mapping stage which provides an orthogonal 2×
2 mapping of two complex numbers composed of the 4 bipolar bits into two complex symbols; and
wherein the orthogonal 2×
2 mapping is defined by the equation;
5 Assignments
0 Petitions
Accused Products
Abstract
A Dual Carrier Modulator (DCM) for a Multiband OFDM (Orthogonal Frequency Division Multiplexing) Transceiver of a Ultra Wide Band (UWB) wireless personal access network transmitting OFDM modulated symbols is provided, wherein each OFDM symbol is modulated by a predetermined number of encoded bits. The Dual Carrier Modulator comprises a grouping unit for grouping NCBPS encoded bits of a serial bit stream into bit groups each having a predetermined number of bits. The Dual Carrier Modulator also comprises a mapping unit for mapping each bit group received from said grouping unit to complex symbols using an orthogonal transform. The Dual Carrier Modulator further comprises a reordering unit for reordering the complex symbols mapped by said mapping unit. Each complex symbol is provided to modulate a corresponding data tone of an OFDM symbol.
87 Citations
5 Claims
-
1. A dual carrier modulator (DCM) for a multiband orthogonal frequency division multiplexing (OFDM) transceiver of an ultra wide band (UWB) wireless network transmitting OFDM modulated symbols, wherein each OFDM symbol is modulated by a first predetermined number (NCBPS) of encoded bits, said dual carrier modulator comprising:
-
(a) a grouping unit configured to group the NCBPS encoded bits of a serial bit stream into bit groups each having a second predetermined number (m) of bits; (b) a mapping unit configured to map each bit group received from said grouping unit to complex symbols (y); and (c) a reordering unit configured to reorder the complex symbols (y) mapped by said mapping unit, wherein each complex symbol (y) is provided to modulate a corresponding data tone of an OFDM symbol; wherein the first predetermined number is two hundred (NCBPS=200) and the second predetermined number is four (m =4), such that the grouping unit groups two hundred encoded bits to bit groups each having four bits; wherein the mapping unit maps bit groups each having four bits respectively to two complex symbols (yn;
yn+NCBPS/4) to generate NCBPS/2 complex symbols (y0. . . yNCBPS/2) for modulating one NCBPS/2 data tones of an OFDM symbol;wherein the mapping unit (1-2) comprises; a first mapping stage for mapping unipolar bit values of the encoded bits within each bit group to bipolar bit values, and a second mapping stage which provides an orthogonal 2×
2 mapping of two complex numbers composed of the 4 bipolar bits into two complex symbols; andwherein the orthogonal 2×
2 mapping is defined by the equation; - View Dependent Claims (2, 3, 4, 5)
-
Specification