PHY layer options for body area network (BAN) devices
In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment using M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK. Also, the PHY layer uses a constant symbol rate for BAN packet transmissions.
1. A method of operating a physical layer (PHY) of a body area network (BAN) device, the method comprising:
generating a physical-layer convergence protocol (PLCP) preamble, including concatenating a 63-bit m-sequence with a 27-bit extension sequence including bit values of 010101010101101101101101101;
generating a PLCP header;
transforming a physical-layer service data unit (PSDU) into a physical-layer protocol data unit (PPDU) pre-appended with the PLCP preamble and the PLCP header; and
transmitting the PPDU at a data rate based on an operation frequency band.
2. The method of claim 1 , wherein the PLCP header is derived from a data structure including a 15-bit PHY header field, a 4-bit header check sequence (HCS) field, and a 12-bit Bose, Ray-Chaudhuri, Hocquenghem (BCH) parity bit field.
3. The method of claim 2 , wherein the 15-bit PHY header field includes:
a 3-bit rate field associated the data rate with the operation frequency band;
an 8-bit length field representing a number of octets in a medium access control (MAC) frame body;
a 1-bit burst mode field; and
a 1-bit scrambler seed field.
4. The method of claim 1 , wherein the generating the PLCP header includes:
generating a PHY header based on a medium access control (MAC) frame body;
generating a header check sequence (HCS) by calculating a header check sequence of the PHY header;
generating Bose, Ray-Chaudhuri, Hocquenghem (BCH) parity bits by applying a BCH code to a concatenation of the PHY header and the HCS; and
generating encoded bits including the PHY header, the HCS, and the BCH parity bits.
5. The method of claim 4 , wherein the generating the PLCP header includes:
spreading the encoded bits based on a spreading factor associated with the operation frequency band;
interleaving the spread bits;
scrambling the interleaved bits based on a seed associated with a channel number of the operation frequency band; and
mapping the scrambled bits to a constellation based on the operation frequency band.
6. The method of claim 1 , further comprising:
generating the PSDU based on a medium access control (MAC) header, a MAC frame body, and a frame check sequence (FCS).
7. The method of claim 6 , wherein the generating the PSDU includes:
generating a bit stream including the MAC header, the MAC frame body, and the FCS;
applying a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder to the bit stream to generate encoded bits;
spreading the encoded bits based on a spreading factor associated with the operation frequency band;
interleaving the spread bits;
scrambling the interleaved bits based on a seed associated with a channel number of the operation frequency band; and
mapping the scrambled bits to a constellation based on the operation frequency band.
8. The method of claim 1 , wherein the transmitting the PPDU includes ramping up a transmission power from 10% to 90% of a maximum power of the PHY within 5 symbols of the PPDU.
9. The method of claim 1 , wherein the transmitting the PPDU includes ramping down a transmission power from 90% to 10% of a maximum power of the PHY within 5 symbols of the PPDU.
10. A body area network (BAN) device, comprising:
a transceiver having a physical layer (PHY) including:
means for generating a physical-layer convergence protocol (PLCP) preamble, including means for concatenating a 63-bit m-sequence with a 27-bit extension sequence including bit values of 010101010101101101101101101;
means for generating a PLCP header;
means for transforming a physical-layer service data unit (PSDU) into a physical-layer protocol data unit (PPDU) pre-appended with the PLCP preamble and the PLCP header; and
means for transmitting the PPDU at a data rate based on an operation frequency band.
11. The BAN device of claim 10 , wherein the PLCP header is derived from a data structure including a 15-bit PHY header field, a 4-bit header check sequence (HCS) field, and a 12-bit Bose, Ray-Chaudhuri, Hocquenghem (BCH) parity bit field.
12. The BAN device of claim 11 , wherein the 15-bit PHY header field includes:
a 3-bit rate field associated the data rate with the operation frequency band;
an 8-bit length field representing a number of octets in a medium access control (MAC) frame body;
a 1-bit burst mode field; and
a 1-bit scrambler seed field.
13. The BAN device of claim 10 , wherein the means for generating the PLCP header includes:
means for generating a PHY header based on a medium access control (MAC) frame body;
means for generating a header check sequence (HCS) by calculating a header check sequence of the PHY header;
means for generating Bose, Ray-Chaudhuri, Hocquenghem (BCH) parity bits by applying a BCH code to a concatenation of the PHY header and the HCS; and
means for generating encoded bits including the PHY header, the HCS, and the BCH parity bits.
14. The BAN device of claim 13 , wherein the means for generating the PLCP header includes:
means for spreading the encoded bits based on a spreading factor associated with the operation frequency band;
means for interleaving the spread bits;
means for scrambling the interleaved bits based on a seed associated with a channel number of the operation frequency band; and
means for mapping the scrambled bits to a constellation based on the operation frequency band.
15. The BAN device of claim 10 , further comprising:
means for generating the PSDU based on a medium access control (MAC) header, a MAC frame body, and a frame check sequence (FCS).
16. The BAN device of claim 15 , wherein the means for generating the PSDU includes:
means for generating a bit stream including the MAC header, the MAC frame body, and the FCS;
a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder for encoding the bit stream to generate encoded bits;
means for spreading the encoded bits based on a spreading factor associated with the operation frequency band;
means for interleaving the spread bits;
means for scrambling the interleaved bits based on a seed associated with a channel number of the operation frequency band; and
means for mapping the scrambled bits to a constellation based on the operation frequency band.
17. The BAN device of claim 10 , wherein the means for transmitting the PPDU includes means for ramping up a transmission power from 10% to 90% of a maximum.
18. The BAN device of claim 10 , wherein the means for transmitting the PPDU includes means for ramping down a transmission power from 90% to 10% of a maximum power of the PHY within 5 symbols of the PPDU.