System-on-a-Chip Radio Transceivers for 60-GHzWireless Body-Centric Communications - Ultra-Wideband and 60 GHz Communications for Biomedical Applications - page 177

Table 1 Millimetre-wave
physical layer channelization

Channel number. Start frequency Stop frequency

1 57.240 59.400

2 59.400 61.560

3 61.560 63.720

4 63.720 65.880

Table 2 High-data rate
physical layer (HRP)
modulation parameters

Parameter Value

Bandwidth 1.76 GHz

Reference sampling rate 2.538 GS/s

Number of subcarriers 512

FFT period Ref. sampling rate/number of

subcarriers

Guard interval 64/reference sampling rate

Symbol duration FFT period + guard interval

Number of data subcarriers 336

Modulation 16QAM-OFDM

are specified as in Table 2 . Convolutional channel coding may be employed to attain
the desired Bit Error Rate (BER). For instance, let us assume that we are interested
in achieving a quasi-error free communication (BER > 10 − 11 ) between two on-body
transceivers. For a system employing the modulation parameters as shown in Table 2 ,
with forward error correction made by Reed-Solomon (216/224) block code and
inner convolutional code (2/3), a signal-to-noise ratio (SNR) at the input of the
receiver equal to 17 dB is required [ 28 ].
For the low-data rate physical layer (LRP), the modulation parameters are speci-
fied as in Table 3 . The LRP supports largely lower data rates than the HRP, up to a
maximum of 10.2 Mb/s.
In the United States the maximum effective isotropic radiated power (EIRP) limits
imposed by the Federal Communication Commission (FCC) [ 1 ] are 27 dBm for
indoor applications and 40 dBm for outdoor applications [ 27 ], while in Japan and
Australia those limits are set equal to 57 and 51.8 dBm [ 27 ]. In Europe those limits
are set to 25 dBm and 40 dBm for indoor and outdoor applications, respectively [ 29 ].

Table 3 Low-data rate physical layer (LRP) modulation parameters
Parameter Value

Bandwidth 92 MHz

Reference sampling rate 317.25 MS/s

Number of subcarriers 128

FFT period Ref. sampling rate/number of subcarriers

Guard interval 28/reference sampling rate

Symbol duration FFT period + Guard interval

Number of data subcarriers 30

Modulation BPSK-OFDM